WO2005008300A1 - 光反射シート、その製造方法及びその成形品 - Google Patents
光反射シート、その製造方法及びその成形品 Download PDFInfo
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- WO2005008300A1 WO2005008300A1 PCT/JP2004/002560 JP2004002560W WO2005008300A1 WO 2005008300 A1 WO2005008300 A1 WO 2005008300A1 JP 2004002560 W JP2004002560 W JP 2004002560W WO 2005008300 A1 WO2005008300 A1 WO 2005008300A1
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- CMPQUABWPXYYSH-UHFFFAOYSA-N phenyl phosphate Chemical compound OP(O)(=O)OC1=CC=CC=C1 CMPQUABWPXYYSH-UHFFFAOYSA-N 0.000 description 1
- QCDYQQDYXPDABM-UHFFFAOYSA-N phloroglucinol Chemical compound OC1=CC(O)=CC(O)=C1 QCDYQQDYXPDABM-UHFFFAOYSA-N 0.000 description 1
- 229960001553 phloroglucinol Drugs 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-O phosphonium Chemical compound [PH4+] XYFCBTPGUUZFHI-UHFFFAOYSA-O 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical class OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003205 poly(diphenylsiloxane) Polymers 0.000 description 1
- 229920006289 polycarbonate film Polymers 0.000 description 1
- 229920006294 polydialkylsiloxane Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical group 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- GDESWOTWNNGOMW-UHFFFAOYSA-N resorcinol monobenzoate Chemical compound OC1=CC=CC(OC(=O)C=2C=CC=CC=2)=C1 GDESWOTWNNGOMW-UHFFFAOYSA-N 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-M salicylate Chemical compound OC1=CC=CC=C1C([O-])=O YGSDEFSMJLZEOE-UHFFFAOYSA-M 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229940116351 sebacate Drugs 0.000 description 1
- CXMXRPHRNRROMY-UHFFFAOYSA-L sebacate(2-) Chemical compound [O-]C(=O)CCCCCCCCC([O-])=O CXMXRPHRNRROMY-UHFFFAOYSA-L 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910021332 silicide Inorganic materials 0.000 description 1
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003462 sulfoxides Chemical class 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000010414 supernatant solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000001926 trapping method Methods 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- KOWVWXQNQNCRRS-UHFFFAOYSA-N tris(2,4-dimethylphenyl) phosphate Chemical compound CC1=CC(C)=CC=C1OP(=O)(OC=1C(=CC(C)=CC=1)C)OC1=CC=C(C)C=C1C KOWVWXQNQNCRRS-UHFFFAOYSA-N 0.000 description 1
- NVSDADJBGGUCLP-UHFFFAOYSA-N trisulfur Chemical compound S=S=S NVSDADJBGGUCLP-UHFFFAOYSA-N 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/002—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor characterised by the choice of material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3472—Five-membered rings
- C08K5/3475—Five-membered rings condensed with carbocyclic rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/24—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material
- F21V7/26—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by the material the material comprising photoluminescent substances
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V7/28—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors characterised by coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31507—Of polycarbonate
Definitions
- the present invention relates to a light reflection sheet, a production method thereof, and a molded product thereof. More specifically, it is excellent in flame retardancy and light reflection characteristics using a polycarbonate resin composition, and is used as a reflector for liquid crystal backlights, lighting equipment, fluorescent tubes used in houses and various facilities, LEDs (light emitting diodes).
- the present invention relates to a thin-walled light reflection sheet suitable for use as a light source part such as an EL (Electro-Magnetic Luminescence), a plasma, a laser, etc., a production method thereof, and a molded product.
- the present invention relates to a light reflection sheet and a molded article thereof, and more particularly to and a molded article thereof. Background art
- light reflecting materials include signboards, displays, and liquid crystal backlights.
- Conventionally used light reflection sheets include metal plates, metal foils, plastic sheets, metal-deposited plastic sheets, and foamed stretched PET films.
- a direct-type backlight is used as a light source to achieve high brightness and high definition on medium-sized and large screens of 508 mm (20 inches) or more.
- Various materials are proposed for the reflector. Is being planned. Foam is used as the reflector of the direct-type LCD backlight
- a PET film or foamed PP film and an A1 plate are bonded together, and a supercritical foamed PET sheet is used. Above all, a foamed PET film A1 is often used as a bent product of a laminated product.
- polycarbonate resin containing a large amount of titanium oxide can be used in the production of sheets and products, such as the occurrence of drone resonance in the extrusion process, rough skin, close contact with rolls, foaming during thermoforming, and uneven wall thickness.
- defects are likely to occur, and it is increasingly necessary to establish a manufacturing method that solves the above problems in order to reduce the thickness and size of light reflection sheets and plates such as liquid crystal displays. Is coming.
- Polycarbonate resin has a high oxygen index among various thermoplastic resins, and is generally referred to as a resin having self-extinguishing properties.
- Polycarbonate-to-polyorganosiloxane copolymers or mixtures of polycarbonate-polyorganosiloxane copolymers and polycarbonate resins generally have higher flame retardancy than polycarbonate resins It is known that However, the level of flame retardancy required in the field of light reflection is generally as high as the V-10 level in the UL94 standard for flame retardancy, and in order to provide flame retardancy satisfying this level, Usually, a flame retardant and a flame retardant auxiliary are further added. It is also necessary for backlight reflectors such as liquid crystal displays. It was generally thought that it was difficult to achieve both flame retardancy and high reflectivity for a thin molded product with a required product thickness of 1 mm or less.
- polycarbonate resin that exhibits flame retardancy without adding a phosphorus-based flame retardant or halogen-based flame retardant while maintaining heat resistance, and has excellent light reflection properties that satisfies high reflectivity and high light blocking properties
- polycarbonate resin that exhibits flame retardancy without adding a phosphorus-based flame retardant or halogen-based flame retardant while maintaining heat resistance, and has excellent light reflection properties that satisfies high reflectivity and high light blocking properties
- PC resin polycarbonate resin
- inorganic fillers such as combinations with foams
- light reflection materials injection materials such as combinations with foams
- Many technologies for molded articles have been proposed.
- the superiority of thermoformed PC resin reflectors over current PET film / A1 board bent products is that resin is easier to shape design than metal processing, and that it is easier to reflect optical design and lighter. And that the processing cost is advantageous.
- a reflector In a direct-type liquid crystal backlight, a reflector is used in close proximity to a plurality of light sources (cold cathode tubes), so light resistance to the wavelength of the light source is required.
- the cold cathode fluorescent lamp emits ultraviolet light having a wavelength of 200 to 400 nm in addition to light in the visible region used as a liquid crystal light source, and this ultraviolet light promotes light deterioration of the reflecting member. .
- the resin forming the reflector turns yellow with the deterioration of light, and the reflection characteristics of the reflector deteriorate. Therefore, for a white PET film, a kneading type light stabilizer for imparting light resistance and a coating technique have been proposed (for example, Japanese Patent Application Laid-Open Nos.
- a reflector In a direct-type liquid crystal backlight, a reflector is used in proximity to a plurality of light sources (cold-cathode tubes), and has a narrow reflection angle distribution (also called specular reflection). For a material with a strong directivity, bright and dark areas are likely to appear with respect to the position of the light source, which causes uneven brightness when viewed as a liquid crystal screen.
- specular reflection For a material with a strong directivity, bright and dark areas are likely to appear with respect to the position of the light source, which causes uneven brightness when viewed as a liquid crystal screen.
- specular reflectivity there is a method other than reducing the specular reflectivity of the reflection plate, and a method of eliminating the luminance unevenness by designing the shape of the reflection plate and the structural design of the backlight unit. Reducing the specular reflectivity tends to lower the reflectivity, and the needs for reflective characteristics vary depending on the user. Therefore, reducing specular reflectivity is not a technique that satisfies all users.
- a white PET film it has been proposed to improve the light diffuse reflection property by adding particles to the light-resistant coating layer (for example, see Japanese Patent Application Laid-Open No. 2002-402). Gazette). Since the reflection sheet made of PC resin generally has higher specular reflectivity than the white PET film, it is difficult to apply the technology of the white PET film as it is. Also, since the coating layer is extended by thermoforming, control of the coating surface is more difficult than white PET.
- the present invention provides a thin-walled light-reflective sheet having excellent flame-retardant, high-reflection, and high-light-shielding light-reflection characteristics using a polycarbonate resin that has solved the above-mentioned problems of the conventional technology. It is an object of the present invention to provide (I) and a molded article, and to provide a method for producing the light reflection sheet having less variation in quality such as thickness.
- the present invention provides a light reflection sheet which has little yellowing and a decrease in reflection characteristics even after long-time use and can be thermoformed in the same manner as a single-layer sheet made of a polycarbonate resin composition. (II) and to provide molded articles thereof.
- the present invention can improve the light diffuse reflection property, and when used as a direct-type liquid crystal backlight, can form a liquid crystal screen with less uneven brightness, and can use a polycarbonate resin. It is an object of the present invention to provide a light reflection sheet (HI) which can be thermoformed in the same manner as a single-layer sheet made of the composition, and a molded article thereof.
- HI light reflection sheet
- the present inventors provide a light-resistant layer having a function of energizing or absorbing ultraviolet light on at least one side of a substrate sheet made of a specific polycarbonate resin composition.
- a light reflection sheet (II) is obtained which has little yellowing and a decrease in reflection characteristics even after long-time use and which can be thermoformed in the same manner as a single-layer sheet made of a polycarbonate resin composition. I found that.
- the present inventors have improved the light diffusion reflectivity by providing a light diffusion layer that diffuses and reflects light on at least one surface of a substrate sheet made of a specific polycarbonate resin composition.
- a light reflection sheet (III) that can form a liquid crystal screen with less luminance unevenness and can be thermoformed in the same manner as a single-layer sheet made of a polycarbonate resin composition is obtained. was found to be.
- the present invention has been completed based on such findings.
- the present invention is an invention having the following contents.
- the polycarbonate resin composition comprises (A) 85 to 60% by mass of a polycarbonate polymer, and (B) 15 to 40% by mass of titanium oxide. Light reflection sheet.
- the light reflection sheet according to any one of [1] to [3] above is from 160 to 200.
- (B) consisting of Polycarbonate resin composition comprising a combination of titanium oxide 1 5-4 0 weight 0/0, on one side both zero. Less of the substrate sheet for the. 4 to 2 mm thickness, the force ultraviolet light A light reflection sheet (II), characterized in that a light-resistant layer for absorbing or absorbing light is provided with a thickness of 0.5 to 20 wm.
- the polymerizable light stabilizer component and the ultraviolet absorber component are those containing at least one compound selected from a hindered amine compound, a benzotriazole compound and a benzozonone compound.
- a polycarbonate resin composition comprising a combination of (A) 85 to 60% by mass of a polycarbonate polymer and (B) 15 to 40% by mass of titanium oxide, and having a thickness of A light reflecting sheet (111) characterized in that a light diffusing layer for diffusing and reflecting light is provided in a thickness of 0.5 to 20 m on at least one side of a base sheet of 0.4 to 2 mm. ).
- the light diffusing layer is a layer in which particles having an average particle diameter of 1 to 20 m selected from organic particles and inorganic particles are dispersed in an acrylic resin or a methacrylic resin.
- the organic particles are particles selected from acrylic-based crosslinked particles and styrene-based crosslinked particles, and the inorganic particles are particles selected from silicic acid and titanium oxide, and the content of the particles is light diffusion.
- the light diffusion layer contains at least one selected from a polymerizable light stabilizer component and an ultraviolet absorber component, and the component includes a hindered amide compound, a benzotriazole compound,
- the light reflection sheet according to any one of the above [13] to [17], which is selected from a benzophenone-based compound.
- FIG. 1 is a partial longitudinal sectional view of the reflection surface of a reflection plate molded product used for direct illumination.
- FIG. 2 is a perspective view showing the shape of the thermoformed product produced in Example 19 and Example 27.
- PC resin composition used in the light reflection sheet (I) of the present invention.
- (I) is 100 parts by mass of (A) + (B).
- the (A) polycarbonate polymer is preferably a mixture of (A-1) a polycarbonate-polyorganosiloxane copolymer and (A-2) a polycarbonate resin.
- (A-1) Polycarbonate-polyorganosiloxane copolymer (hereinafter sometimes abbreviated as PC-PS copolymer) may be of various types, but is preferably represented by the following general formula ( 1)
- R and R 2 are each a halogen atom (for example, inn, fluorine, and nitrogen) or an alkyl group having 1 to 8 carbon atoms (for example, a methyl group, an ethyl group, a propyl group, and an isopropyl group).
- n and n are each an integer of 0 to 4; when m is 2 to 4, R 1 may be the same or different; and when n is 2 to 4, R 1 May be the same or different from each other.o and Z is an alkylene group having 1 to 8 carbon atoms or 2 carbon atoms.
- alkylidene groups for example, methylene group, ethylene group, propylene group, butylene group, pentylene group, hexylene group, ethylidene group, isopylidene group, etc.
- a cycloalkylene group of 5 or a cycloalkylidene group having 5 to 15 carbon atoms for example, a cyclopentylene group, a cyclohexylene group, a cyclopentylidene group, a cyclohexidene group, etc.
- R 3 , R 4 and R 5 are each a hydrogen atom, an alkyl group having 1 to 5 carbon atoms (eg, a methyl group, an ethyl group, a propyl group, an n-butyl group, an isobutyl group, etc.)] Or a phenyl group, wherein p and q are each an integer of 0 or 1 or more, and the sum of p and q is an integer of 1 or more. ]
- It consists of a polyorganosiloxane part having a repeating unit of the structure represented by Here, the degree of polymerization of the polycarbonate part is 3 to
- the degree of polymerization of the polyorganosiloxane moiety is preferably 2 to 500.
- the PC-PS copolymer includes a polycarbonate unit having a repeating unit represented by the general formula (1) and a polyol unit having a repeating unit represented by the general formula (3).
- Such a PC—POSS copolymer is, for example, a polycarbonate oligomer that constitutes a polycarbonate part produced in advance.
- PC oligomer and a polyorganosiloxane having a reactive group at a terminal constituting the polyorganosiloxane portion
- a polyorganosiloxane having a reactive group at a terminal constituting the polyorganosiloxane portion for example, polydimethylsiloxane (PDMS), polydialkylsiloxane such as polyethylsiloxane, or polymethylsiloxane, etc.
- a solvent such as methylene chloride, cyclobenzene, chloroform and the like
- sodium hydroxide of bisphenol is dissolved.
- It can be produced by adding an aqueous solution of water and performing an interfacial polycondensation reaction using triethylamine or trimethylbenzylammonium chloride as a catalyst.
- the PC oligomer having a repeating unit represented by the general formula (1) is prepared by a solvent method, that is, in a solvent such as methylene chloride in the presence of a known acid acceptor and a molecular weight regulator, the following general formula: Equation (4)
- a divalent phenol represented by the following formula can be easily produced by reacting a divalent phenol represented by the following formula with a carbonate precursor such as phosgene. That is, for example, in a solvent such as methylene chloride, the reaction between a divalent phenol and a carboxylate precursor such as phosgene in the presence of a known acid acceptor or molecular weight regulator. Can be manufactured. Further, it can also be produced by a transesterification reaction of a divalent phenol with a carbonate precursor such as a carbonate compound.
- the divalent phenol represented by the general formula (4) various ones can be mentioned. In particular, 2,2-bis (4-hydroxyphenol) propane [commonly known as bisphenol A] is preferred. O Bisphenol
- As divalent phenols other than A for example, bis (4-hydroxyphenyl) methane; 1,1-bis (41-hydroxyphenyl) ethane; 1,2-bis (4—Hydroxyphenyl)
- (4-Hydroxyphenyl) alkane 1,1-bis (4-hydroxyphenyl) cyclohexane; 1,11-bis (4-hydroxyphenyl) cyclodecane and other bis (4-hydroxyphenyl) cycloalkanes , 4,4 'dihydroxydiphenyl, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) szolephonbis (4-hydroxyphenyl) ) Sulfoxide, bis (4-hydroxyphenyl) ether, bis (4-hydroxyphenyl) ketone and the like.
- divalent phenols include hydroquinone. Each of these nice plane phenols may be used alone or in combination of two or more.
- Examples of the carbonate compound include diaryl carbonates such as diphenyl carbonate, and dialkyl forces such as dimethyl carbonate and getyl carbonate.
- a molecular weight modifier may be used as necessary.
- the molecular weight regulator is not particularly limited, and those conventionally used in the production of polycarbonate can be used. These include, for example, phenol, p-cresole, D-tert-butylphenol, p-tert-octylphenol Examples include monohydric phenols such as enol, p-cumylphenol, p-noylphenol, and p-dodecylphenol.
- the PC oligomer to be used for the production of the PC-P0S copolymer may be a homopolymer using the above-mentioned divalent phenol, or a mixture of two or more thereof. May be used. Further, it may be a thermoplastic random-branched polycarbonate obtained by using a polyfunctional aromatic compound in combination with the above-mentioned divalent phenol.
- n -. Hexane soluble matter to 1 0 wt 0/0 following PC- P 0 in the production of S copolymers for example 1 0 mass polyorganosiloxane emissions content of the copolymer 0/0 as well as the following general formula the number of repeating units using those 1 0 0 or more represented by (3), and tertiary catalyst 5 such as ⁇ Mi emissions.
- the polycarbonate resin (A-2) constituting the PC resin composition (I) according to the present invention can be easily prepared, for example, by reacting divalent phenol with phosgene or a carbonate compound.
- Can be manufactured that is, for example, in a solvent such as methylene chloride, in the presence of a known acid acceptor or a molecular weight regulator, by the reaction of divalent phenol with a carbonate precursor such as phosgene, or in the presence of a solvent or It can be produced by a transesterification reaction between a dihydric phenol and a carbonate precursor such as a carbonate compound in the absence thereof.
- the divalent phenol may be the same as or different from the compound represented by the above general formula (4).
- carbonate compound and the molecular weight regulator those similar to the above can be used.
- the polycarbonate resin is one of the above divalent phenols. It may be a homopolymer using a species, or a copolymer using two or more species. Further, it may be a thermoplastic random branched polycarbonate resin obtained by using a polyfunctional aromatic compound in combination with the above divalent phenol.
- the polyfunctional aromatic compound is generally referred to as a branching agent, and specifically includes 1,1-tris (4-hydroxyphenyl) ethane, a, a ', ⁇ ,, Lis (4—hydroxyphenyl) -1,3,5—triisopropylpropylbenzene, 1_ [ ⁇ -methyl_ ⁇ — (4'—hydroxyphenyl) ethyl] 1-4 — [',' — bis (4, -Hydroxyphenyl) ethyl] Benzene, phloroglucin, trimellitic acid, isatin bis (0-cresol) and the like.
- Polycarbonate resin has a viscosity average molecular weight from the viewpoint of mechanical strength, especially Izod impact strength and moldability.
- the viscosity average molecular weight (M v) was determined by measuring the viscosity of the methylene chloride solution at I 0 C using an Ubbelohde viscometer and calculating the intrinsic viscosity [??
- [ ⁇ ]] 1.3 X1 (Value calculated by the formula of ⁇ 5 ⁇ ⁇ ° ⁇ 83.
- Polycarbonate resin having such properties is, for example, tough resin FN300A , FN2500A. FN2200O A. FN1900A, F1700A. FN1500A (trade name, manufactured by Idemitsu Petrochemical Co., Ltd.)
- the total of 100 parts by mass of each of the components (A) + (B) is 100 parts by mass of the component (A).
- the mixing ratio of the component (A-1) is 5 to 85 parts by mass, preferably 10 to 58 parts by mass, and the mixing ratio of the component (A-2) is 0 to 80 parts by mass, preferably Is 10 to 7 5 Parts by weight. If the amount of the component (A_1) is less than 5 parts by mass, the dispersibility of the polyorganosiloxane will deteriorate, and sufficient flame retardancy will not be obtained. On the other hand, when the components (A-1) and (A-2) are in the preferred ranges, a material having good flame retardancy can be obtained.
- the content of the polyorganosiloxane moiety in PC-PS may be appropriately selected according to the level of flame retardancy required for the final resin composition.
- the proportion of the polyorganosiloxane moiety in the component (A-1) is preferably from 0.3 to 10% by mass, based on the total amount of the component (A-1) and the component (A-2). Preferably it is 0.5 to 5% by mass. Where 0. Not enough oxygen index is obtained is less than 3 mass 0 6, there is a possibility that the flame retardancy of interest is not expressed. Also, if more than 1 0 weight 0/0, there is a possibility that the heat resistance of the resin is significantly reduced, it becomes a resin Kos up. In the preferred range, a more favorable oxygen index is obtained, and excellent flame retardancy is obtained.
- the “polyorganosiloxane” does not include or exclude the polyorganosiloxane component contained in the organosiloxane, which is the component (D) described below.
- the titanium oxide as the component (B) of the present invention is used in the form of a fine powder for the purpose of imparting high reflectivity and low transparency to the polycarbonate resin, that is, high light-shielding properties.
- the fine powder of titanium oxide can be produced by either the chlorine method or the sulfuric acid method.
- the titanium oxide used in the present invention may be either a rutile type or an anatase type, but a rutile type is preferred in terms of heat stability, weather resistance and the like.
- the shape of the fine powder particles is not particularly limited, and can be appropriately selected and used, such as scaly, spherical, and amorphous.
- the titanium oxide used as the component (B) may be a hydrated aluminum and / or silicon oxide, a 7-mine compound, a polyol compound. Those surface-treated with, for example, are preferred. By performing this treatment, the uniform dispersibility in the PC resin composition (I) and the stability of the dispersed state are improved, and the affinity with the flame retardant to be added is also improved, and the uniformity is improved. It is preferable from the viewpoint of composition production. Examples of the aluminum oxide hydrate, the amine compound and the boryl compound include alumina hydrate, silicic hydrate, triethanolamine and trimethylolene, respectively. can do.
- the treatment method itself in the surface treatment is not particularly limited, and an arbitrary method may be appropriately adopted.
- the amount of the surface treatment agent applied to the surface of the titanium oxide particles by this treatment is not particularly limited, but may be determined in consideration of the light reflectivity of the titanium oxide and the moldability of the PC resin composition (I). 0.1 to TiO2
- the particle diameter of the titanium oxide powder used as the component (B) is not particularly limited. Those having a diameter of about 0.1 to 0.5 m are suitable.
- the compounding amount of titanium oxide in the PC resin composition (I) according to the present invention is preferably 15 to 40 parts by mass with respect to 100 parts by mass of each of the components (A) + (B). Or 20 to 40 parts by mass. If the amount is less than 15 parts by mass, the light-shielding properties are insufficient, and the light reflectance is greatly reduced, which is not preferable.
- the compounding amount exceeds 40 parts by mass, it is difficult to form a pellet by kneading and extrusion, and it becomes difficult to mold the resin, and there is a tendency that silver is more likely to be generated in the molded product.
- the amount of component (B) should be between 20 and 35 parts by mass is more preferred.
- the surface acid amount of the titanium oxide used in the present invention is preferably 10 micromoles / g or more, and the surface base amount is preferably 10 micromoles / g or more.
- the surface acid amount is less than 10 micromol / g or the surface base amount is less than 10 micromol / g, the reactivity with the organosiloxane compound as the stabilizer becomes low. Therefore, the dispersion of titanium oxide may be insufficient, and the high brightness of the molded article may be insufficient.
- the surface acid content of the titanium oxide is more preferably 15 micromoles / g or more, more preferably 16 micromoles / g or more, and the surface base amount is more preferably 2 or more. It is 0 micromol / g or more, and more preferably 25 micromol / g or more.
- the surface acid amount and surface base amount of titanium oxide are measured by potentiometric titration in a non-aqueous solution. Specifically, the amount of surface acid is determined by dispersing titanium oxide in a 1/1000 normal n-propylamine solution in MIBK (methyl isobutyl ketone), and separating the supernatant solution into a 1/1000 normal perchlorine solution. It is measured by potentiometric titration using an acid MIBK solution. In addition, the amount of surface base was adjusted by dispersing titanium oxide in MIBK (methylisobutyl ketone) solution of 1/100 normal acetic acid, and the supernatant was diluted with 1/100 normal force of lithium methoxide. It is measured by potentiometric titration using MIBK solution.
- MIBK methylisobutyl ketone
- the PC resin composition (I) according to the present invention contains, as the component (C), polytetrafluoroethylene having a fibril-forming ability (hereinafter sometimes abbreviated as “PTFEJ”), If necessary, a melt dripping prevention effect can be imparted, and high flame retardancy can be imparted.
- the average molecular weight of PTFE is preferably 500,000 or more, more preferably 50,000, 0000 to 100, 0000, 0000, and more preferably 1, 0000, 0000 to 100, 0000, 0000.
- the amount is preferably from 0 to 1.0 part by mass, more preferably from 0.1 to 0.5 part by mass, based on 100 parts by mass of the total of the components (A) and (B).
- the amount exceeds 1.0 parts by mass, not only does the impact resistance and the appearance of the molded product have an adverse effect, but also the discharge of the strand pulsates during kneading and extrusion, and stable pellet production may not be possible. There is. In the above range, a suitable effect of preventing dripping of the melt is obtained, and an excellent flame-retardant product is obtained.
- Polytetrafluoroethylene (PTFE) having a fibril-forming ability is not particularly limited, and for example, those classified into Even 3 according to the ASTM standard can be used.
- Teflon 6 — J (trade name: Mitsui 'Dupont Fluorochemicals Co., Ltd.)
- Polyfuron D_1 and Polyfuron F-103 (Product Name: Daikin Industries, Ltd.).
- examples include Argoflon F5 (trade name: manufactured by Montefluos) and polyflon MPAFA-100 (trade name: manufactured by Daikin Industries, Ltd.).
- These PTFE may be used in combination of two or more.
- PTFE having a fibril-forming ability as described above can be prepared, for example, by adding tetrafluoroethylene in an aqueous solvent in the presence of sodium, potassium, or ammonium xylene disulfide in the presence of 0.04%. It can be obtained by polymerization at a temperature of 0 to 200 ° C (preferably 20 to 100 ° C) under a pressure of 7 to 0.7 MPa.
- an organosiloxane as the component (D) prevents degradation of the resin, and provides mechanical strength, stability, heat resistance and the like of the resin. It is preferable because it maintains the characteristics. Specifically, alkyl hydrogen silicone and alkoxy silicone are listed. I can get lost.
- alkyl hydrogen silicone examples include methyl hydrogen silicone and ethyl hydrogen silicone.
- alkoxysilicon examples include methoxysilicon and ethoxysilicon.
- Particularly preferred alkoxysilicones are, specifically, silicone compounds containing an alkoxysilyl group in which the alkoxy group is bonded to a silicon atom directly or via a divalent hydrocarbon group. Examples thereof include linear, cyclic, reticulated, and partially branched linear organopolysiloxanes, with linear organopolysiloxanes being particularly preferred. More specifically, an organopolysiloxane having a molecular structure in which a silicone main chain is bonded to an alkoxy group via a methylene chain is preferable.
- Such organosiloxanes of component (D) include, for example, SH1107, SR2402, BY16—1660, BY16, manufactured by Toray's Dow Corning Co., Ltd. — 161, BY 16 — 16 0 E, BY 16 — 16 1 E, etc. can be suitably used.
- the addition amount of the organosiloxane depends on the addition amount of titanium oxide, but is preferably 0.05 to 2.0 parts by mass with respect to 100 parts by mass of each component of (A) + (B). Range is preferred. If the amount is less than 0.05 parts by mass, the polycarbonate resin may be degraded, and the molecular weight of the resin may be reduced. Even if the amount exceeds 2.0 parts by mass, the effect is not significantly improved for the added amount, and it is economically disadvantageous, and silver is generated on the surface of the molded product, which deteriorates the appearance of the product. There is a risk.
- the PC resin composition (I) according to the present invention includes, as far as it does not impair the object of the present invention, and Depending on various flame retardants, inorganic fillers, additives, Or other synthetic resins, elastomers and the like can be blended.
- flame retardants include phosphorus compounds and bromine compounds.
- the composition used in the present invention is already flame-retardant by combining the polycarbonate (polyorganosiloxane copolymer) of the component (A-1) with the polycarbonate resin of the component (A-2).
- sufficient flame retardancy is required, if necessary, if less than 0.5 parts by mass, preferably less than 0.5 parts by mass, per 100 parts by mass of component (A) + (B) Can be used in a range of less than 3 parts by mass.
- a phosphate compound is preferred. Specific examples include trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxetyl phosphate, triphenyl phosphate, Triscresyl phosphate, cresyl diphenyl phosphate, octinoresiphenyl phosphate, tri (2-ethylhexyl) phosphate, disopropylphenyl phenyl phosphate Tris, trixylenyl phosphate, tris (Isop D henenoeninophosphonate, trinaphthyl phosphate, bisphenol A bisphosphonate, hydroquinone bisphosphate, resorcinbis Phosphate, resorcinol-l-phenylphenol phosphate, tri-sulfur xybenzentriphosphate, Rejir
- brominated flame retardants include, for example, brominated bisphenol A-type epoxy polymer, pentabromobenzyl acrylate, brominated polycarbonate, netoligomers, and triazines.
- Flame retardants tetrabromobisphenol A, bis (tribromophenoloxy) ethane, tetrabromobisphenol A—bis (2—hydroxyxethyl ether), tetrabromobisphenol A—bis (2,3— Dibromopropyl ether), tetrabromobisphenol A-bis
- GF carbon fiber, glass beads, glass flakes, carbon black, calcium sulfate, carbonated calcium carbonate, calcium gayate, lumina, silica, asbestos, talc, cres, my power, quartz powder And so on.
- the additives include phosphorus-based hindered phenol-based and amine-based antioxidants, such as benzotri7-zole-based and benzofuunone-based ultraviolet absorbers.
- external lubricants such as aliphatic carboxylate ester type, paraffin type, silicone oil, polyethylene wax and the like, release agents, antistatic agents, coloring agents and the like.
- polystyrene examples include polyethylene, polypropylene, polystyrene, AS resin (acrylonitrile-styrene copolymer), ABS resin (acrylonitrile-butadiene-styrene copolymer), and polystyrene. Examples of each resin such as methyl methacrylate can be given. Also, examples of the elastomer include isobutylene-isoprene rubber, styrene-butadiene rubber, ethylene-propylene rubber, and acrylic elastomer.
- the light reflection sheet (I) of the present invention is formed as follows. First, the PC resin composition (I) is dried usually at 120 to 140 ° C. for 2 to 10 hours (drying step), and extruded with an extruder equipped with a devolatilizing device (extrusion step). The sheet is formed at a die temperature of about 0 to 260 ° C and a roll temperature of about 120 to 180 ° C (sheet forming step).
- the drying conditions of the PC resin composition (I) are preferably from 130 to 140 ° C. for 2 to 10 hours, and more preferably from 130 to 140 ° C. ⁇ 10 hours.
- the drying of the PC resin composition (I) can be performed in an atmosphere such as general heating air, dry air, or vacuum. By this drying, it is possible to remove most of the water contained in the material and volatile reaction by-products generated during the compounding.
- An extruder for sheet molding requires a devolatilizer.
- This devolatilizing apparatus is capable of reducing the pressure of a molten PC resin composition to an atmospheric pressure or less, and is preferably at most 13.3 kPa (-700 mmHg) or less during extrusion. Reduce the pressure to less than 97.3 kPa (-730 mmHg).
- This vacuum devolatilization removes water remaining in the PC resin composition and volatile reaction by-products generated during the compounding process. Even volatile reaction by-products can be removed.
- the die temperature is usually from 200 to 260 ° C, preferably from 200 to 250 ° C ⁇ , more preferably from 200 to 240 ° C.
- the draw resonance phenomenon is likely to occur, resulting in uneven thickness in the sheet width direction (especially at the end) and in the length direction. Reflection unevenness is likely to occur. This is a phenomenon that tends to occur in sheet molding when the PC resin composition (I) according to the present invention contains a large amount of titanium oxide powder.
- the temperature of the cooling roll at the time of sheet forming is usually from 120 to 180 ° C, preferably from 110 to 170 ° C. If the temperature of all the holes is less than 10 ° C, the sizing between the nip rolls is difficult due to the high rigidity of the melt of this material, and the homogeneity of the surface state in the width and length directions is maintained. Therefore, uneven reflection is likely to occur on the surface of the sheet and its thermoformed product.
- the light-reflecting sheet (I) of the present invention has thermoformability, and using this light-reflecting sheet, a reflecting plate having a reflecting surface suitable for the number and shape of the light sources under specific thermoforming conditions is manufactured. can do.
- the sheet heating temperature (sheet surface temperature) during thermoforming is usually from 160 to 200 ° C, preferably from 170 to 200 ° C, and the average expansion ratio is from 1.1 to 2 ° C. Times, preferably 1.2 to 1.8 times.
- the method of thermoforming is not particularly limited, but press forming, vacuum forming, vacuum pressure forming, hot plate forming, corrugated plate forming and the like can be used.
- the forming method generally called vacuum forming, a drape homing method, a matched die method, a pressure bubble-resistant vacuum forming method, a plug assist method, a vacuum snapback method, an air slip homing method, and a trapping method.
- Sheet heating Examples include the shoring method and the simple compressed air forming method.
- the vacuum forming pressure may be appropriately set at 1 MPa or less.
- thermoforming is difficult, and if it is higher than 200 ° C., uneven surface roughness tends to occur on the sheet surface. If the average expansion ratio is less than 1.2 times, it is difficult to design a reflecting plate according to the shape of the light source. If the average expansion ratio is more than 2 times, the unevenness of the thickness of the thermoformed product becomes large, and the unevenness of the reflectance tends to occur.
- the suitable drying conditions are usually 120 to 140 t. And 2 to 10 hours.
- the shape of the molded product may be appropriately selected according to the shape, number, and characteristics of the light source. For example, in the case of a reflection plate for a direct-type liquid crystal backlight, Japanese Patent Application Laid-Open No. 2000-260, Japanese Patent Application Laid-Open No. 2000-3656959, Japanese Patent Application Laid-Open No. The shapes disclosed in Japanese Patent Application Laid-Open No. 200-297613 and Japanese Patent Application Laid-Open No. 2002-320209 can be used.
- a transparent resin layer or an acrylic resin layer containing an antistatic agent and a light stabilizer can be laminated on the light reflecting surface. At this time, the thickness of the resin layer is
- the thickness is preferably 500 m or less, and the total light transmittance at a thickness of 100 m or more is preferably 85% or more.
- a light shielding material and a layer for structural reinforcement can be provided on the surface opposite to the light reflecting surface.
- the light shielding material includes a thin metal layer such as aluminum, a coating, and the like
- the structural reinforcement layer includes a poly-carbonate resin layer.
- These other layers can be laminated by methods such as coating, vapor deposition, extrusion lamination, dry lamination, and co-extrusion.
- a metal layer such as an aluminum foil may be provided for heat diffusion.
- the light reflection sheet (I) of the present invention can be obtained by a combination of the above-described method with the PC resin composition (I), and at least one layer is composed of the PC resin composition and has a thickness of 0.4. Up to 2 mm, light reflectivity of 98% or more, light transmittance of less than 0.1% and equivalent to 0.8mm thickness in vertical flame retardancy test according to UL 94 method, V-0 class flame retardance It has properties and thermoformability.
- the thickness of the light reflection sheet (I) is 0.4 to 2 mm, preferably 0.6 to 2 mm, and more preferably 0.6 to 1.5 mm. If the thickness of the sheet is less than 0.4 mm, drawdown occurs when a large-area reflector is thermoformed, and it is difficult to suppress uneven thickness, and uneven light reflection in the surface is likely to occur. If it exceeds mm, the temperature difference between the surface on one side, the inside and the surface on the opposite side is likely to occur during heating during thermoforming, and as a result, it is difficult to obtain a thermoformed product with uniform reflection characteristics.
- the light reflection sheet (I) has a light reflectance of 98% or more, preferably 98.2% or more, and more preferably 98.5% or more.
- a high reflectance can be achieved by adjusting the content of titanium oxide.
- the light transmittance of the light reflecting sheet (I) is less than 1%, preferably less than 0.9%, and more preferably less than 0.8%. Sheets with such excellent light shielding properties have a titanium oxide content, sheet thickness, This can be achieved with good surface conditions.
- the light reflectance is less than 95% or the light transmittance is 1% or more, it is difficult to obtain sufficient luminance in the intended reflection application.
- the light reflection sheet (I) has a V-0 class in a vertical flame retardancy test conforming to the UL 94 method at a thickness of 0.8 mm, so that it can be used as a light box flame retardant. Can be enhanced.
- thermoformability it is easy to design a shape according to the type and number of light sources, and a light box with high luminance and evenness can be obtained.
- Base sheet constituting the light reflecting sheet of the present invention ([pi) is, (A) poly Kabone one preparative polymer 8 5-6 0 weight 0/0 and (B) titanium oxide powder 1 5-4 0 weight 0/0 combination made of PC resin composition (II) containing the
- the (A) polycarbonate-based polymer is preferably a mixture of (A_1) polycarbonate-polyorganosiloxane copolymer and (A-2) polycarbonate resin. .
- the components (A-1) and (A-2) are the same as those described in the light reflection sheet (I), and will not be described.
- the mixing ratio of (A—1) component of the (A) component is preferably 5 to 85 parts by mass. Or 10 to 58 parts by mass, and the mixing ratio of the component (A-2) is 0 to 80 parts by mass, preferably 10 to 75 parts by mass. If the amount of the component (A-1) is less than 5 parts by mass, the dispersibility of the polyorganosiloxane will deteriorate, and sufficient flame retardancy will not be obtained. On the other hand, when the component (A-1) and the component (A-2) are in a preferable range, a material having good flame retardancy can be obtained.
- the content of the polyorganosiloxane moiety in P ⁇ s may be appropriately selected depending on the level of flame retardancy required for the final resin composition.
- (A- 1) the ratio of the polyorganosiloxane moiety in the component, (A- 1) of the component and (A- 2) the total amount of the components, preferably 0. 3 to:. I 0 mass 0/0, more preferred properly is 0.5 to 5 mass 0/0. If the amount is less than 0.3% by mass, sufficient oxygen fingers may not be obtained, and the desired flame retardancy may not be exhibited. If the amount exceeds 10% by mass, the heat resistance of the resin is significantly reduced.
- polyorganosiloxane is described later.
- the polyorganosiloxane component contained in the organosiloxane that is the component (D) is excluded and excluded.
- the titanium oxide as the component (B) of the present invention is used in the form of a fine powder for the purpose of imparting high reflectivity and low transparency to the polycarbonate resin, that is, high light-shielding properties.
- the titanium oxide of the component (B) is the same as the description in the above-mentioned light reflection sheet (I), and the description is omitted.
- the PC resin composition (II) according to the present invention contains an organosiloxane as the component (D) to prevent the resin from deteriorating and to provide the resin with mechanical strength, stability, and heat resistance. It is preferable from the viewpoint of maintaining such characteristics as the above.
- the description of the organosiloxane as the component (D) is omitted since it is the same as that given in the light reflection sheet (I).
- the PC resin composition (II) according to the present invention contains, in addition to the components (A), B), (C) and (D), as far as the object of the present invention is not impaired, and in addition, various inorganic fillers, additives, or other synthetic resins, elastomers, and the like can be blended.
- various inorganic fillers, additives, or other synthetic resins, elastomers, and the like can be blended.
- the above-mentioned inorganic filler compounded for the purpose of increasing the mechanical strength, durability or weight of the PC resin composition ( ⁇ ⁇ ) include glass fiber (GF :), carbon fiber, glass beads, glass fiber and the like. Rake, carbon black, calcium sulfate, calcium carbonate, calcium gayate, alumina, silica, asbestos, talc, crepe, mai power, quartz powder, and the like.
- antioxidants such as hindered phenol-based and amide-based additives, such as benzotriazole-based and benzofunonone-based ultraviolet absorbers, such as fats.
- External lubricants such as aromatic carboxylic acid ester type, paraffin type, silicone oil and polyethylene wax, release agents, antistatic agents, coloring agents and the like.
- Other synthetic resins include polyethylene, polypropylene, polystyrene, AS resin (acrylonitrile-styrene copolymer), ABS resin (acrylonitrile-butadiene-styrene copolymer), Examples of resins such as polymethyl acrylate and the like can be given.
- the elastomers include isobutylene-isoprene rubber, styrene-butadiene rubber, ethylene-propylene rubber, and acrylic elastomer.
- the light-resistant layer constituting the light reflection sheet (II) of the present invention has a function of cutting or absorbing ultraviolet light. Cut or absorption of ultraviolet light can be realized by including one or more selected from light stabilizers and ultraviolet absorbers in the light-resistant layer.
- light stabilizers and ultraviolet absorbers include hindered amines, salicylic acids, benzophenones, benzotriazoles, benzoxazinones, cyanoacrylates, and triazines.
- System, benzoate system, oxalic acid amide system, organic nickel system and other organic compounds, or sol-gel and other inorganic systems Compounds are preferred.
- salicylic acid-based compounds examples include p_t monobutylphenyl salicylate and P-octylfuilyl salicylate.
- benzophenone compounds include 2-hydroxy 4-benzo-benzophenone, 2-hydroxy-4- methoxy-benzophenone, and 2-hydroxy ethoxy.
- Benzotriazole-based compounds include ⁇ 2- (2,1-hydroxypropyl-15,1-methylphenyl) benzotriazole, 2- 2 (2-hydrogen) Roxy 5'-t-butylyl) benzotoazole, 21
- Tylphenyl] benzotri 7 sol 2- (2-hydroxy-5- ⁇ -l-oxoxethyl phenyl) 1-2H-benzotriazole, 2-(2, —hydr ⁇ ! Xy 5, 1-hydroxybenzoyl phenyl, 2-(2'-hydroxy 3,
- the cyanoacrylate-based compounds include, but are not limited to, sodium 2-chloro-1,3-diphenylacrylate, 2-ethylhexyl1-2-cyano33-diphenylacrylate, and the like. 3-bis- [2'-cyano-3,3'-diphenylacryloyloxy] 1-2,2-bis-[(2-cyan-1-3 ', 3-diphenylacryloyl) oxy] 4 4 0
- Benzoate-based compounds include 24t-di-t-butylphenyl 3,3,, 5'-di-t-butyl-4-hydroxybenzoate, resorcinol-monobenzoate, and orthobenzoylbenzoate. Cyl and the like are oxalic acid anilide-based compounds.
- Ethyloxy cadmium bisanilide and the like are nickel bis compounds (octyl phenyl) sulphide,
- benzoxazinone-based compound examples include 2,2,1- (1,4-phenylene) bis [4H-3,1 benzoxazine-4-1].
- a 7-mine compound a benzophenone compound and a benzotriazole compound.
- the light stabilizer and / or the ultraviolet absorber are mixed with another resin component as appropriate.
- the resin component and the light stabilizer and / or the ultraviolet absorber are dissolved in the solvent.
- a liquid, a resin component, a light stabilizer and / or an ultraviolet absorber, in which one of the dissolved mixed solution, the resin component, and the light stabilizer and / or the ultraviolet absorber is dissolved and the other is dispersed, are previously prepared. It is preferable to separately dissolve or disperse in a solvent, and to use a mixed liquid obtained by mixing and dissolving or dispersing them in a solvent.
- one or more solvents selected from water and organic solvents may be used as appropriate. It is also preferable to use a copolymer of a light stabilizer component and / or an ultraviolet absorber component and a resin component as it is as a coating liquid.
- the resin component to be mixed or copolymerized with the light stabilizer and / or the ultraviolet absorber is not particularly limited. Examples thereof include a polyester resin, a polyurethane resin, an acryl resin, and a methacryl resin. Resin, polyamide resin, polyethylene resin, polypropylene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, polyvinyl acetate resin, fluorine resin, etc. No. These resins can be used alone or in combination of two or more. In the present invention, among the above resin components, an acryl resin and a methacryl resin are preferable.
- an acryl-based resin or a methacryl-based resin obtained by copolymerizing a light stabilizer component and / or an ultraviolet absorber component in the light-resistant layer it is preferable to use an acryl-based resin or a methacryl-based resin obtained by copolymerizing a light stabilizer component and / or an ultraviolet absorber component in the light-resistant layer.
- copolymerization it is preferable to copolymerize a polymerizable light stabilizer component and / or an ultraviolet absorber component with an acryl monomer component or a methacryl monomer component.
- polymerizable light stabilizer component and ultraviolet absorber component examples include hindered amines, benzotriazoles, benzophenones, benzoxazinones, cyanoacrylates, triazines, and malonone. It is preferable to use one or more selected from acid ester compounds. These polymerizable light stabilizer components and ultraviolet absorber components contain hindered amine, benzotriazole, benzophenonone, benzoxazinone, cyanoacrylate, triazine or malonic ester in the base skeleton. Any compound having a polymerizable unsaturated bond may be used. Usually, it is a monomeric compound of an atalyl-based methacryl thread having a functional group derived from these compounds having a light absorbing ability or an ultraviolet absorbing ability in a side chain.
- the polymerizable benzotriazole compounds include 2 — (2, — hydroxyl 5 — acrylyloxetyl phenyl) — 2 H-benzotriazole, and 1 (2 '— Hydroxy 1-5, -Medium Chroxyshtylphenyl 1 2 H-Benzotriazole, 2 1 (2, —Hydroxy 1 3' — t —Puchyl 5 '—Atari Chilphenyl) Ichi 5 — black ' ⁇ -1 2 H-benzotriazole and the like
- polymerizable benzophenone-based compound examples include 2-hydroxy-4-1-methoxy-5-acryloxyxetylphenylbenzophenone,
- Alkyl acrylate monomer or a methacrylic monomer component or a sesame monomer component copolymerized with a heavy-mouth light stabilizer component and / or an ultraviolet absorber component is an alkyl acrylate.
- Alkyl methacrylate alkyl groups include methyl group, ethyl, ⁇ -butyl pill, ss ⁇ -pill group, n-butyl group, isoptyl ⁇ t-butyl group 2-ethylhexyl group , Lauryl, stearyl, cyclohexyl, etc.
- a monomer having a crosslinkable functional group e.g., carboxyl, methylol, acid anhydride, sulfonic, amide, methyl
- a monomer having a D-alkylated amide group an amino group, an alkylated amino group, a hydroxyl group, an epoxy group, and the like.
- the copolymer may be a copolymer with a methyl ester, methylvinyl ketone, vinyl chloride, vinylidene chloride, vinyl acetate, vinylpyridine, vinylpyrrolidone, alkoxysilane having a vinyl group, unsaturated polyester, or the like.
- the copolymerization ratio of the polymerizable light stabilizer component and / or ultraviolet absorber component and the monomer to be copolymerized is not particularly limited, but the polymerizable light stabilizer component and / or ultraviolet light may be used.
- a polymer obtained by polymerizing a polymerizable light stabilizer component and / or an ultraviolet absorber component without using the above-described monomer may be used.
- the molecular weight of these polymers is not particularly limited, but is usually 5,000 or more, and preferably 100,000 or more, more preferably 200, or more, from the viewpoint of the toughness of the coating layer. , 0 0 0 or more.
- These polymers are used in the state of being dissolved or dispersed in an organic solvent, water or an organic solvent / water mixture.
- hybrid-based light-stable polymers can also be used.
- HC-935UE manufactured by K.K. can be used.
- additives such as a fluorescent whitening agent and an antistatic agent can be added as long as the reflection characteristics and light resistance of the light-resistant layer are not impaired.
- the optical brighteners include: Ubitek (trade name: Ciba Specialty Chemicals), 0B—1 (trade name: Eastman), TB0 (trade name: Sumitomo Seika) ), Gay Cole (trade name: manufactured by Nippon Soda Co., Ltd.), Calais (trade name: manufactured by Nippon Kayaku Co., Ltd.) Commercial products such as M (trade name: manufactured by Client Japan) can be used.
- the content of the fluorescent whitening agent in the light-resistant layer is preferably from 0.01 to 2% by mass, more preferably from 0.03 to 1.5% by mass, and even more preferably from 0.05 to 5% by mass. ⁇ 1% by mass. If the amount is less than 0.01% by mass, the effect is small. If the amount exceeds 2% by mass, yellowishness may occur, or durability may be easily reduced.
- As the antistatic agent phosphonium sulfonate and the like can be used.
- the substrate sheet constituting the light reflection sheet (II) of the present invention is formed by the same method as described in the molding of the light reflection sheet (I).
- the light-resistant layer containing the above-mentioned light stabilizer and / or ultraviolet absorber may be provided directly on the above-mentioned substrate sheet, but if the adhesiveness is insufficient, the surface of the substrate sheet is removed. It is preferable to provide a light-resistant layer after corona discharge treatment or undercoating treatment.
- the undercoating treatment may be performed in the above sheet manufacturing process (inline coating method), or may be performed after the substrate sheet is manufactured and separately applied (offline coating method). Good.
- the material used for the undercoating treatment is not particularly limited, and may be appropriately selected. Copolymerized polyester resin, polyurethane resin, acryl resin, methacryl resin, and various kinds of force pre-treatments can be used. And the like.
- the coating solution can be applied by any method.
- methods such as gravure coating, roll coating, spin coating, reverse coating, bar coating, screen coating, blade coating, air-naif coating, and date-bing can be used.
- After the application it is dried, for example, in a hot air oven at 80 to 120 ° C.
- the light-resistant layer is cured by a known method.
- a known method can be adopted.
- a method of curing with heat, a method of curing with actinic rays such as ultraviolet rays, electron beams, and radiation, and a curing method of a combination thereof can be applied.
- the coating liquid for forming the light-resistant layer may be applied (in-line coating) at the time of manufacturing the base sheet, or applied (off-line coating) on the base sheet after the completion of the crystal orientation. May be.
- the light-reflecting sheet (H) of the present invention obtained as described above has a light-resistant layer provided on at least one side of the substrate sheet for powering or absorbing ultraviolet light (in particular, light of 38 O nm or less). It was done.
- the thickness of the base sheet needs to be 0.4 to 2 mm, preferably 0.6 to 2 mm, and more preferably 0.6 to 1.5 mm. If the thickness of the base sheet is less than 0.4 mm, drawdown occurs when thermoforming a large-area light-reflective sheet, so it is difficult to suppress uneven thickness and unevenness of in-plane light reflection. Tends to occur.
- the thickness of the base sheet exceeds 2 mm, the temperature difference between one surface of the base sheet, the inside of the base sheet, and the other surface of the base sheet during heating during thermoforming. Is likely to occur, and as a result, it becomes difficult to obtain a thermoformed product having uniform reflection characteristics.
- the thickness of the light-resistant layer needs to be 0.5 to 20 m, preferably 1 to 15 m, and more preferably 2 to 1 Owm. If the thickness of the light-resistant layer is less than 0.5 m, the ultraviolet light-cutting performance and ultraviolet absorption performance of the light-resistant layer will be insufficient, and if the thickness of the light-resistant layer exceeds 20 m, the light reflection sheet will be insufficient. (II) inhibits the high reflection characteristics.
- the light reflection sheet (II) of the present invention preferably has a reflectance of 90% or more, more preferably 95% or more, measured by irradiating the surface of the light-resistant layer with light having a wavelength in the visible light region. It is more preferably at least 97%. Such a high reflectance can be achieved by adjusting the content of titanium oxide in the PC resin composition (II) forming the base sheet.
- the light transmittance of the light reflecting sheet (II) is preferably less than 1%, more preferably less than 0.9%, and further preferably less than 0.8%. Such a sheet having excellent light shielding properties can be achieved by the content of oxidized silicon, the thickness of the sheet, and a good surface condition.
- the light reflectance is less than 90% or the light transmittance is 1% or more, it is difficult to obtain sufficient luminance in the intended reflection application. Further, by having thermoformability, it is easy to design a shape according to the type and number of light sources, and a light box with high brightness and evenness can be obtained.
- the light reflection sheet (II) of the present invention has a color difference ( ⁇ ⁇ ) before and after irradiation when the surface of the light-resistant layer is irradiated with ultraviolet light at an energy amount of 20 J / cm 2 using a high-pressure mercury lamp. ) Is 10% or less, and the decrease in the reflectance of visible light is 5% or less, since the change in the color tone and the decrease in luminance of the liquid crystal screen when the liquid crystal screen is used for a long time is preferable. . More preferably, the color difference ( ⁇ ⁇ ) before and after irradiation is 5 or less, and the decrease in the reflectance of visible light is 3% or less.
- the light reflection sheet ( ⁇ ) of the present invention has thermoformability.
- a reflection plate having a reflection surface according to the number and shape of the light sources under specific thermoforming conditions is used. Can be manufactured.
- the thermoforming conditions are the same as the thermoforming conditions in the light reflection sheet 1, (I) except for the drying conditions of the preliminary drying, and therefore the description thereof is omitted.
- the above-mentioned drying conditions are usually appropriate for 100 to 120 ° (5 to 12 hours).
- the light-reflective sheet (II) of the present invention has little yellowing and deterioration in reflection characteristics even after prolonged use, and can be subjected to the same thermoforming as a single-layer sheet made of a PC resin composition. It is.
- Substrate sheet constituting the light reflecting sheet ( ⁇ ) of the present invention (A) polycarbonate - DOO polymer 8 5-6 0 weight 0/0 and (B) titanium oxide emissions powder 1 5
- Examples of the (A) polycarbonate polymer include (A-0) a polycarbonate resin or (A-1) a polycarbonate monopolysiloxane copolymer and an (A-2) polycarbonate resin. And mixtures thereof.
- the components (A-1) and (A-2) are the same as described in the light reflection sheet (I), and the component (A-0) is the same as the component (A-2). Therefore, their description is omitted.
- the components (C), (C) and (D) are the same as those described in the light reflection sheet (II), and will not be described.
- the PC resin composition (III) according to the present invention contains, in addition to the components (A), (B), (C) and (D) described above, as far as the object of the present invention is not impaired, and Depending on the various inorganic fillers, additives, or their Other synthetic resins, elastomers and the like can be blended. These are the same as the description of the light reflection sheet (II), and the description is omitted.
- the light diffusion layer constituting the light reflection sheet (III) of the present invention has a function of diffusing and reflecting light.
- the diffuse reflection of light is caused by the light diffusing layer having an average particle diameter of 1 to 20 wm, preferably 1 to 15 wm, more preferably 3 to 15 / m, selected from organic particles and inorganic particles. Can be realized by dispersing the If the average particle size is less than 1 ⁇ m, the effect of diffuse reflection of light is insufficient, and if the average particle size exceeds 20, the surface is unnecessarily roughened or Shedding is more likely to occur.
- Examples of the organic particles include acryl-based crosslinked particles, styrene-based crosslinked particles, etc., and acryl-based crosslinked particles and styrene-based crosslinked particles are preferable.
- Commercially available acrylic crosslinked particles include MBX (trade name: manufactured by Sekisui Chemical Co., Ltd.).
- Examples of the inorganic particles include silica, titanium oxide, alumina, zinc oxide, barium sulfate, calcium carbonate, zeolite, kaolin, and talc. Silica and titanium oxide are preferred.
- Mizukasil (trade name: manufactured by Mizusawa Chemical Co., Ltd.) is a commercially available silica product. These particles can be used alone or in combination of two or more.
- the light diffusing layer 0. 5 is preferably 5 0 mass 0/0, 5 2 0 wt% Gayo Ri preferred arbitrariness.
- organic particles and / or inorganic particles dispersed in a resin component in order to make it easier to form a light diffusion layer containing organic particles and / or inorganic particles, it is preferable to use organic particles and / or inorganic particles dispersed in a resin component. That is, A liquid mixture in which a liquid and a resin component in which organic and / or inorganic particles are dispersed and a resin component and an organic and / or inorganic particle are separately dissolved or dispersed in a solvent in advance, and then mixed. Is preferably used as a coating liquid. In this case, one or more solvents selected from water and organic solvents may be used as appropriate.
- the resin component mixed or mixed with the organic particles and / or the inorganic particles is not particularly limited. Examples thereof include a polyester resin, a polyurethane resin, an acrylic resin, a methacryl resin, and a polyamide resin. Resins, polyethylene resins, polypropylene resins, polyvinyl chloride resins, polyvinylidene chloride resins, polystyrene resins, polyvinyl acetate resins, and fluorine resins. These resins can be used alone or in combination of two or more. In the present invention, among the above-mentioned resin components, an acryl resin and a methacryl resin are preferable.
- an acryl-based resin or a methacryl-based resin obtained by copolymerizing a light stabilizer component and / or an ultraviolet absorber component in the light-resistant layer it is preferable to use an acryl-based resin or a methacryl-based resin obtained by copolymerizing a light stabilizer component and / or an ultraviolet absorber component in the light-resistant layer.
- copolymerization it is preferable to copolymerize a light stabilizer component and / or an ultraviolet absorber component with an acrylic monomer component or a methyl monomer component.
- the light diffusing layer contains at least one selected from a light stabilizer and an ultraviolet absorber from the viewpoint of imparting ultraviolet light cutting or absorbing performance to the light reflection sheet (II!).
- a light stabilizer and an ultraviolet absorber from the viewpoint of imparting ultraviolet light cutting or absorbing performance to the light reflection sheet (II!).
- light stabilizers and ultraviolet absorbers include hindered amines, salicylic acids, benzophenones, benzotriazoles, benzoxazinones, cyanoacrylates, triazines, and the like.
- Organic compounds such as benzoate, oxalic acid, and organic nickel, or sol-gel Inorganic compounds are preferred. Since these specific examples are the same as those described in the light reflection sheet (II), the description thereof will be omitted.
- another light resin component is appropriately mixed with the light stabilizer and / or the ultraviolet absorber.
- it is used. That is, a mixed solution in which a resin component, a light stabilizer and / or an ultraviolet absorber is dissolved in a solvent, and one of the resin component and the light stabilizer and / or an ultraviolet absorber are dissolved and the other is dispersed. It is preferable to dissolve or disperse the liquid and the resin component and the light stabilizer and / or the ultraviolet absorber separately in a solvent in advance, and to use a mixed liquid obtained by mixing and dissolving them as a coating liquid.
- one or more solvents selected from water and organic solvents may be used as appropriate. It is also preferable to use a copolymer of a light stabilizer component and / or a UV absorber component and a resin component as it is as a coating liquid.
- a polymerizable light stabilizer component and / or ultraviolet absorber component it is preferable to copolymerize a polymerizable light stabilizer component and / or ultraviolet absorber component with an acryl monomer component or a methacryl monomer component.
- the polymerizable light stabilizer component and ultraviolet absorber component are selected from hindered amine, benzotriazole, benzophenone, benzoxazinone, cyanoacrylate, triazine, and malonic ester compounds. It is preferable to use more than one type. Since these are the same as the description of the light reflection sheet (II), the description is omitted.
- additives such as a fluorescent whitening agent and an antistatic agent can be added as long as the reflection characteristics and light resistance of the light diffusion layer are not impaired. Wear. Since these are the same as the description in the light reflection sheet (II), the description is omitted.
- the base sheet constituting the light reflecting sheet (III) of the present invention is formed by the same method as that described in the molding of the light reflecting sheet (I).
- the light diffusion layer containing the above-mentioned organic particles and / or inorganic particles may be provided directly on the above-mentioned base sheet, but when the adhesiveness is insufficient, the surface of the base sheet is subjected to edge discharge. It is preferable to provide the light diffusion layer after the treatment or the undercoating treatment. Regarding the undercoating process and the method of applying the coating liquid when the light diffusion layer is provided on the substrate sheet, see the light reflection sheet described above.
- the light reflection sheet of the present invention obtained as described above has a light diffusion layer for diffusing and reflecting light provided on at least one surface of the base sheet.
- the thickness of the base sheet needs to be 0.4 to 2 mm, preferably 0.6 to 2 mm, more preferably 0.6 to 1.5 mm. If the thickness of the base sheet is less than 0.4 mm, it is difficult to suppress uneven thickness because the opening of the door is reduced when a large-area base sheet is thermoformed. Light reflection unevenness is likely to occur. If the thickness of the base sheet exceeds 2 mm, one surface of the base sheet, the inside of the base sheet, and the other surface of the base sheet are heated during thermoforming. As a result, a temperature difference easily occurs, and as a result, it becomes difficult to obtain a thermoformed product having uniform reflection characteristics.
- the thickness of the light diffusion layer needs to be 0.5 to 2 Owm, preferably 1 to 15 im, and more preferably 2 to 10 m. If the thickness of the light diffusion layer is less than 0.5, the light diffuse reflection property of the light diffusion layer When the light-diffusing layer has a thickness exceeding 20 m, the high reflection characteristics of the light reflection sheet are impaired.
- the light reflection sheet ( ⁇ ⁇ ) of the present invention preferably has a reflectance of 90% or more measured by irradiating the surface of the light diffusion layer with light having a wavelength in the visible light region, and more preferably. Is 95% or more, more preferably 97% or more. Such a high reflectance can be achieved by adjusting the content of titanium oxide in the PC resin composition forming the base sheet.
- the light transmittance of the light reflecting sheet is preferably less than 1%, more preferably less than 0.9%, and even more preferably less than 0.8%. Such a sheet having excellent light shielding properties can be achieved by the content of titanium oxide, the thickness of the sheet, and a good surface condition.
- the light reflectance is less than 90% or the light transmittance is 1% or more, it is difficult to obtain sufficient luminance in the intended reflection application. Further, by having thermoformability, it is easy to design the shape according to the type and number of light sources, and it is possible to provide a light box with high brightness and evenness.
- the total reflectance (SCI) measured by irradiating the surface of the light diffusion layer with light having a wavelength in the visible light range, and the reflectance (SCE) obtained by removing specular reflection from total reflection. ) Is preferably 4% or less from the viewpoint that unevenness in brightness of the liquid crystal screen (due to the position of the internal fluorescent tube) is suppressed.
- the light reflection sheet ( ⁇ ⁇ ) of the present invention has a color difference before and after irradiation when the surface of the light diffusion layer is irradiated with ultraviolet light at an energy amount of 20 J / cm 2 using a high-pressure mercury lamp. It is preferable that ( ⁇ ) is 10 or less and the decrease in the reflectance of visible light is 5% or less from the viewpoint of suppressing a change in color tone and a decrease in luminance of the liquid crystal screen. More preferably, the color difference before and after irradiation ( ⁇ E) is 5 or less, and the decrease in the reflectance of visible light is 3b / 6 or less.
- the light reflection sheet (III) of the present invention has thermoformability.
- a reflection plate having a reflection surface suitable for the number and shape of light sources under specific thermoforming conditions is used. Can be manufactured.
- the thermoforming conditions are the same as those of the above-mentioned light reflection sheet (I) except for the predrying drying conditions, and therefore, the description thereof is omitted.
- the drying conditions described above are usually appropriate at 100 to 120 ° C. for 5 to 12 hours.
- the sheet manufacturing conditions and the thermoforming conditions described above it is possible to obtain a molded product in which the thickness unevenness of the molded product on the light reflecting surface is 0.1 mm or less. If the thickness unevenness of the reflection surface exceeds 0.2 mm, uniform surface reflection characteristics cannot be obtained.
- the shape of the molded product can be the same as the shape described in the light reflection sheet (I).
- the light-reflecting sheet ( ⁇ ) of the present invention has improved light-diffusing reflectivity, and when used as a direct-type liquid crystal backlight, can form a liquid crystal screen with less uneven brightness, and has a PC resin composition.
- This is a light-reflective sheet that can be thermoformed in the same way as a single-layer sheet made of.
- the orifice plate was introduced into a tube reactor having a length of 10 m through an orifice plate, and phosgene was co-currently blown into the tube reactor at a flow rate of 10.7 kg / hour to continuously react for 3 hours.
- the tubular reactor used here was a double tube, and the outlet of the reaction solution was kept at 25 ° C through cooling water through the jacket.
- the pH of the discharged liquid was adjusted to be 10 to 11.
- the reaction solution thus obtained was allowed to stand, and the aqueous phase was separated and removed, and the methylene chloride phase (220 liters) was collected. 7 g / liter).
- the degree of polymerization of the PC oligomer obtained here was 2 to 4, and the concentration of the chromate-formate group was 0.7 normal.
- 1,483 g of octamethylcyclotetrasiloxane, 96 g of 1,1,3,3-tetramethyldisiloxane and 35 g of 86% sulfuric acid are mixed and left at room temperature for 17 hours. Stirred. Thereafter, the oil phase was separated, 25 g of sodium hydrogen carbonate was added, and the mixture was stirred for 1 hour. After filtration, vacuum distillation was performed at 150 ° C. and 0.3 torr (400 Pa) to remove an oil having a low boiling point to obtain an oil.
- the mixture was stirred for 3 hours while maintaining the temperature at 115 ° C.
- the product was extracted with methylene chloride and washed three times with 80% aqueous methanol to remove excess 2-arylphenol.
- the product was dried over anhydrous sodium sulfate and the solvent was distilled off in vacuo to a temperature of 115 t.
- the reactive PDMS (polydimethylsiloxane) of the obtained terminal phenol was found to have a dimethylsilanoloxy unit repeating number of 30 by NMR measurement. I got it.
- the above reaction system was prepared by dissolving 600 g of bisphenol A in 5 liters of a 5.2% by mass aqueous solution of sodium hydroxide, 8 liters of methylene chloride and p — 96 g of tert-butylphenol was added, and the mixture was stirred and reacted at 500 rpm at room temperature for 2 hours.
- the viscosity average molecular weight (Mv) and the content of PDPS were determined by the following methods.
- bisphenol A type linear polycarbonate 3 Idemitsu Petrochemical Co., Ltd.
- Even Freon FN 1700, Mv 1 7,000
- titanium oxide powder manufactured by Ishihara Sangyo Co., Ltd., trade name: PF 726) to 2 0 total 1 0 0 parts by weight 0/0
- O Lugano siloxane Dow Corning Toray Co., Ltd., trade name: BY 1 6 - 1 6 1).
- PC resin composition 14 it is 0 parts by mass, and polytetrafluoroethylene (PTFE, manufactured by Asahi Glass Co., Ltd., trade name: CD 0) 0.36 parts by mass of triphenylphosphine (manufactured by Johoku Chemical Co., Ltd.) as an antioxidant 0.1 part by mass of the name JC2663) was mixed and melt-kneaded with a twin-screw extruder to obtain PC resin composition 14.
- PTFE polytetrafluoroethylene
- CD 0 polytetrafluoroethylene
- triphenylphosphine manufactured by Johoku Chemical Co., Ltd.
- titanium oxide powder manufactured by Ishihara Sangyo Co., Ltd.
- PTFE polytetrafluoroethylene
- As an antioxidant 0.1 part by mass of triphenylphosphine (manufactured by Johoku Chemical Co., Ltd., trade name: JC263) was mixed and melt-kneaded with a twin-screw extruder. Composition 1 was obtained.
- Production example 7 [Production of transparent, light-resistant, antistatic, flame-retardant polycarbonate-based film for sheet lamination]
- PC resin composition-1 6 I parts by mass, 0.3 parts by mass of polytetrafluoroethylene (PTFE, manufactured by Asahi Glass Co., Ltd., trade name: CD076), triphenylinylphosphine (manufactured by Johoku Chemical Co., Ltd., trade name: JC26) 3) was mixed with 0.1 part by mass, and 1 part by mass of an ultraviolet absorber (manufactured by Chemi-Pro Kasei Co., Ltd., trade name: Chemisobe 79) was melt-kneaded with a twin-screw extruder. Thus, PC resin composition-1 6 was obtained.
- PTFE polytetrafluoroethylene
- CD076 polytetrafluoroethylene
- triphenylinylphosphine manufactured by Johoku Chemical Co., Ltd., trade name: JC26
- the PC resin composition 1-1 (PC-1, pellet) was dried in a hot air oven at 140 ° C. for 4 hours.
- the dried composition was extruded horizontally using a 65 mm ⁇ single-screw extruder equipped with a devolatilizer, a gear pump and an extruder equipped with a 60 cm wide coat hanger die. Then, a sheet having a thickness of l mm was obtained.
- the cylinder temperature is 250 to 260 ° (:, the devolatilization pressure is
- PC resin composition 1-1 PC-1, pellet
- Example 3 The procedure was the same as in Example 1 except that the devolatilizing pressure was set at 1101.3 kPa (-760 mmHg).
- Example 5 The procedure was the same as Example 1 except that the die temperature was set at 150 ° C. Examples 5 and 6
- Example 2 The procedure was the same as in Example 1 except that the take-up speed was adjusted to obtain sheets having a thickness of 1.6 mm and a thickness of 0.6 mm.
- PC resin composition 1 (PC-2) was used.
- Example 3 The procedure was the same as Example 1 except that PC resin composition 1-3 (PC-3) was used.
- Example 2 The same procedure as in Example 1 was carried out except that PC resin composition 1-4 (PC-4 was used).
- Example 2 The same as in Example 1 except that the devolatilizing device of the extruder was not used. It was.
- Example 4 The procedure was the same as in Example 1 except that the die temperature was set at 270 ° C. Comparative Example 4
- Example 1 was the same as Example 1 except that the roll temperatures of N O .1 to N 0.3 were all set at 110 ° C. The sheet was lifted and warped, and no evaluable sheet could be obtained.
- Example 1 was the same as Example 1 except that the roll temperature of N 0.1 to 1 0.3 was all set to 190 ° C. Adhesion from the cooling roll was remarkable, and the flatness was poor, so that an evaluable sheet could not be obtained. Comparative Example 6
- Example 1 PC-1 140 ° C, 4 hours -100.0 210 120/150/170 1 0.03 None 98.7 0.2 Passed
- Example 2 PC-1 120 ° C, 10 hours -100.0 210 120/150/170 1 0.03 None 98.6 0.2 Passed
- Example 3 PC-1 140 ° C, 4 hours -101.3 210 120/150/170 1 0.03 None 98.8 0.2 Passed
- Example 4 PC-1 140 ° C, 4 hours -100.0 250 120/150/170 1 0.03 None 98.7 0.2 Passed
- Example 5 PC-1 140 ° C.
- a reflector molded product having the shape shown in FIG. 1 used for direct illumination (for example, see Japanese Patent Application Laid-Open No. 2002-32029) was produced by thermoforming. .
- the sheet was dried at 140 ° C for 5 hours, and the surface temperature of the sheet was adjusted to 180 ° C using a thermoforming machine FK-0431-1-10 manufactured by Asano Laboratories. After heating, it was obtained by vacuum forming with an A1 mold with an average expansion ratio of 1.3.
- the reflecting plate 1 has curved portions 4 at both ends, forms a light source receiving groove in the center, and has a multi-bend 3 reflecting surface.
- Example 11 The procedure was the same as that of Example 11 except that the sheet prepared in Example 5 was used, and the A1 type having an average expansion ratio of 1.8 was used.
- Example 11 was performed in the same manner as in Example 11, except that the sheet prepared in Example 6 was used and A1 type having an average expansion ratio of 1.15 was used.
- Example 11 The procedure was the same as Example 11 except that the sheet surface temperature during thermoforming was set to 155 ° C.
- the sheet surface temperature during thermoforming is 210. Except having changed to C, it carried out similarly to Example 11.
- Example 11 The procedure was the same as that of Example 11 except that the sheet prepared in Example 5 was used and the A1 type having an average expansion ratio of 2.3 was used.
- Table 2 shows the properties of the thermoformed products.
- the PC resin composition-1 (PC-1, pellet) was dried in a hot air oven at 140 ° C. for 4 hours. Using the dried composition, extrude horizontally in a 65 mm ( ⁇ single-screw extruder, gear pump and extruder with a 60 cm width coat hanger die equipped with a devolatilizer. Then, a sheet having a thickness of 600 m was obtained at a temperature of 250 to 260 ° (: devolatilizing pressure of 100 k ⁇ 0 k).
- a light reflection sheet was produced in the same manner as in Example 14 except that the thickness of the light-resistant layer was changed to 10 m.
- a light reflection sheet was prepared in the same manner as in Example 14 except that PC resin composition-2 (PC-2, pellet) was used instead of PC resin composition-11. did.
- Example 14 is the same as Example 14 except that the light stabilizer in the light-resistant layer was a hindered amine light stabilizer (manufactured by Nippon Shokubai Co., Ltd., trade name: U-double UV-G301). Thus, a light reflection sheet was produced.
- the light stabilizer in the light-resistant layer was a hindered amine light stabilizer (manufactured by Nippon Shokubai Co., Ltd., trade name: U-double UV-G301).
- U-double UV-G301 hindered amine light stabilizer
- Example 14 was the same as Example 14 except that the light stabilizer in the light-resistant layer in Example 14 was a benzophenone-based ultraviolet absorber (manufactured by Yushi Kogyo Co., Ltd., trade name: HC-935 UE). Similarly, a light reflection sheet was produced.
- the light stabilizer in the light-resistant layer in Example 14 was a benzophenone-based ultraviolet absorber (manufactured by Yushi Kogyo Co., Ltd., trade name: HC-935 UE). Similarly, a light reflection sheet was produced.
- Reference example 1 the light stabilizer in the light-resistant layer in Example 14 was a benzophenone-based ultraviolet absorber (manufactured by Yushi Kogyo Co., Ltd., trade name: HC-935 UE).
- the PC resin composition 1-1 (PC-1, pellet) was dried in a hot air oven at 140 ° C. for 4 hours.
- the dried composition was extruded horizontally using a 65 mm ⁇ single-screw extruder equipped with a devolatilizer, a gear pump, and an extruder equipped with a 60 cm-wide coat hanger die.
- Sheet molding was performed to obtain a sheet having a thickness of 600 m.
- the cylinder temperature is 250 to 260 ° (: devolatilization pressure is 10.00.0 kPa (—750 mmHg), and the die temperature is 210 ° (:
- a sheet was prepared in the same manner as in Reference Example 1, except that in place of PC resin composition 11, PC resin composition 13 (PC-3, pellet) was used.
- the sheet was not provided with a light-resistant layer, and was a light reflection sheet of only the base sheet.
- a light stabilizer manufactured by Nippon Shokubai Co., Ltd., trade name: Interview one double UV _ G 1 2
- the diluted coating solution is applied to a thickness of 0 • 4 ⁇ m using a bar coater and dried in a hot air oven at 110 ° C for 5 minutes to form a light-resistant layer.
- a reflection sheet was made.
- the ⁇ value was measured using a D65 light source (wavelength in the visible light region) under the conditions of a viewing angle of 10 °, and the reflectance (SCI) of 400 to 700 nm including specular reflection was obtained.
- SCI was measured on the basis of an unirradiated sample under the conditions of an F light source and a viewing angle of 10 degrees.
- the SCI is the reflectance measured including the surface gloss (specular reflection) of the sample. Table 3
- the light reflecting sheet of Example 15 was dried at 100 ° C. for 8 hours, then vacuum-formed at a sheet heating temperature of 180 ° C. to a developing magnification of 1.1, and a space between adjacent peaks of the waveform was obtained.
- Thermoformed product with the waveform shown in Fig. 1 with a length of 38 mm, an interval between adjacent waveform bottom points of 18 mm, a waveform height of 10 mm, and a size of 30.4 cm x 40 cm [50] 8 mm (20 inches), cold-cathode tube reflector with eight lamps].
- Thermoformability was good.
- This thermoformed product has eight valleys (three in FIG. 2) formed by adjacent waveforms as shown in FIG. 2, and has a length of 40 cm indicated by L. .
- the thickness of the light-resistant layer in the obtained thermoformed product was 8 im, and the thickness of the base sheet was 500 m.
- the light resistance ( ⁇ E) of the thermoformed product was 4.3, and the reflectance was 98.5% before irradiation and 96.8% after irradiation.
- Example 20 The PC resin composition 1-1 (PC_1, pellet) was dried in a hot air oven at 140 ° C. for 4 hours. The dried composition was extruded horizontally using a 65 mm single-screw extruder equipped with a devolatilizer, a gear pump, and an extruder equipped with a 60 cm wide coat hanger die. Sheet molding was performed to obtain a sheet having a thickness of 600 wm.
- the cylinder temperature is 250 to 260 ° (: devolatilizing pressure is 100.
- the die temperature is 210 t.
- the dispersion liquid added and dispersed by stirring was applied to one side of the above-mentioned sheet to a thickness of 5 m using a barco overnight, and was then placed in a hot air oven at 120 ° C for 5 minutes. Drying was performed under the conditions to form a light diffusion layer, and a light reflection sheet was produced.
- Example 20 was the same as Example 20 except that the acrylic crosslinked particles in the light diffusion layer were changed to silicide particles (Mizusawa Chemical Co., Ltd., trade name: Mizukasil P510, average particle size 5 m).
- Light reflection sheet 1 was produced in the same manner as in Example 20.
- Example 20 a light stabilizer (manufactured by Nippon Shokubai Co., Ltd., trade name: U-double UV-G1) was used in place of the solution in which the acryl resin was dissolved in the mixed solvent at a concentration of 20% by mass of solid content. 2)
- the propylene glycol Except that a solution with a dissolved at a concentration of solids 2 0 mass 0/0 Chirueteru in the same manner as in Example 2 0 to prepare a light reflecting sheet one bets.
- Example 22 the acryl crosslinked particles in the light diffusion layer were changed to acryl crosslinked particles (trade name: MBX-8, average particle size 8 um, manufactured by Sekisui Chemical Co., Ltd.)
- MBX-8 average particle size 8 um, manufactured by Sekisui Chemical Co., Ltd.
- a light reflection sheet was produced in the same manner as in Example 22 except that the thickness of the film was changed to 8 ifm.
- Example 20 the acrylic cross-linked particles in the light diffusion layer were changed to styrene cross-linked particles (manufactured by Sekisui Chemical Co., Ltd., trade name: SBX-8, average particle size 811 m), and A light reflection sheet was produced in the same manner as in Example 20 except that the thickness was changed to 8 / m.
- Example 10 was the same as Example 0 except that the light stabilizer in the light-diffusing layer was a benzophenone-based ultraviolet absorber (manufactured by YAS Co., Ltd., trade name: HC-935UE). Similarly, a light reflection sheet was manufactured.
- the light stabilizer in the light-diffusing layer was a benzophenone-based ultraviolet absorber (manufactured by YAS Co., Ltd., trade name: HC-935UE). Similarly, a light reflection sheet was manufactured.
- Example I0 a light reflection sheet was produced in the same manner as in Example 20 except that PC resin composition-1 (PC-2, pellet) was used instead of PC resin composition-1. did.
- the PC resin composition 1-1 (PC-1, pellet) was dried in a hot air oven at 140 ° C. for 4 hours.
- the dried composition was extruded horizontally using an extruder equipped with a 65 mm single-screw extruder equipped with a devolatilizer, a gear pump, and a coat hanger die with a width of 60 cm.
- the sheet was formed by the cooling roll method to obtain a sheet having a thickness of 600 / m.
- the cylinder temperature is 250 to 260 ° (: devolatilizing pressure is 100.
- a light reflection sheet was produced in the same manner as in Example 20 except that the acrylic crosslinked particles were not added to the light diffusion layer.
- the light-reflecting sheets obtained in the comparative examples and the reference examples were evaluated in the same manner as described above. However, in addition to the reflectance of 400 to 700 nm including specular reflection (SCI), the reflectance of 400 to 700 nm including specular reflection (SCE) was also calculated.
- SCE is the reflectance measured without including the surface gloss (specular reflection) of the sample sheet. Table 4 shows the results.
- the light-reflecting sheet of Example 12 was dried at 100 ° C. for 8 hours, then vacuum-formed at a sheet heating temperature of 180 ° C. to a developing magnification of 1.2, and the peaks of adjacent waveforms were formed.
- Thermoformed product with a waveform shown in Fig. 2 with a distance of 38 mm between adjacent waveform bottom points, a height of waveform of 1 O mm, and a size of 30.4 cm x 40 cm [Fig. 508 mm (20 inches), 8 cold-cathode tube reflectors] were obtained.
- This thermoformed product has eight valleys (three in FIG. 2) formed by adjacent waveforms as shown in FIG. 2, and has a length indicated by L of 40 cm. is there.
- the thickness of the light diffusion layer in the obtained thermoformed product was 4 m, and the thickness of the base sheet was 500 m.
- the light resistance ( ⁇ ) of the thermoformed product was 5.3, the reflectance (without UV irradiation) was 97.9% for SCI, 97.2% for SCE, and 0.3 for SCI-SCE. 7%.
- the light reflection sheet of the present invention is suitable for a display component such as a liquid crystal backlight, a lighting device, a fluorescent tube used in a house or facility, a reflection component of a light source such as an LED, an EL, a plasma, or a laser.
- a display component such as a liquid crystal backlight, a lighting device, a fluorescent tube used in a house or facility, a reflection component of a light source such as an LED, an EL, a plasma, or a laser.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112004001304T DE112004001304T5 (de) | 2003-07-18 | 2004-03-02 | Lichtreflektierende Folie, Verfahren zu deren Herstellung und Formkörper davon |
US10/563,565 US20060159926A1 (en) | 2003-07-18 | 2004-03-02 | Light refection sheet, process for producing the same and molding thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-199082 | 2003-07-18 | ||
JP2003199082A JP4080966B2 (ja) | 2003-07-18 | 2003-07-18 | 光反射シート及びその成形品 |
JP2003-199083 | 2003-07-18 | ||
JP2003199083A JP4080967B2 (ja) | 2003-07-18 | 2003-07-18 | 光反射シート及びその成形品 |
Publications (1)
Publication Number | Publication Date |
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WO2005008300A1 true WO2005008300A1 (ja) | 2005-01-27 |
Family
ID=34082323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/002560 WO2005008300A1 (ja) | 2003-07-18 | 2004-03-02 | 光反射シート、その製造方法及びその成形品 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060159926A1 (ja) |
KR (1) | KR101083163B1 (ja) |
DE (1) | DE112004001304T5 (ja) |
TW (1) | TW200504150A (ja) |
WO (1) | WO2005008300A1 (ja) |
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CN101313098B (zh) * | 2005-12-22 | 2010-12-29 | 东丽株式会社 | 光反射片材 |
KR101331358B1 (ko) | 2005-07-05 | 2013-11-19 | 이데미쓰 고산 가부시키가이샤 | 광확산성 폴리카보네이트계 수지 조성물, 및 동 수지조성물을 이용한 광확산판 |
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WO2014066784A1 (en) | 2012-10-25 | 2014-05-01 | Sabic Innovative Plastics Ip B.V. | Light emitting diode devices, method of manufacture, uses thereof |
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EP3420025B1 (en) | 2016-02-28 | 2023-06-21 | B.G. Negev Technologies & Applications Ltd., at Ben-Gurion University | Additives for protection of polymers against ultraviolet light |
US11345132B2 (en) | 2017-09-29 | 2022-05-31 | Sumitomo Bakelite Co., Ltd. | Optical sheet and optical component |
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Also Published As
Publication number | Publication date |
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TWI346676B (ja) | 2011-08-11 |
TW200504150A (en) | 2005-02-01 |
DE112004001304T5 (de) | 2006-10-19 |
KR101083163B1 (ko) | 2011-11-11 |
US20060159926A1 (en) | 2006-07-20 |
KR20060037367A (ko) | 2006-05-03 |
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