CN101035665B - Manufacturing method of methacrylic resin extruded sheet for optics - Google Patents
Manufacturing method of methacrylic resin extruded sheet for optics Download PDFInfo
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- CN101035665B CN101035665B CN200580034052XA CN200580034052A CN101035665B CN 101035665 B CN101035665 B CN 101035665B CN 200580034052X A CN200580034052X A CN 200580034052XA CN 200580034052 A CN200580034052 A CN 200580034052A CN 101035665 B CN101035665 B CN 101035665B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/10—Homopolymers or copolymers of methacrylic acid esters
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
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- 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
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Planar Illumination Modules (AREA)
Abstract
There is provided a methacrylic resin extrusion plate formed by a mixture having an apparent density of 0.80 g/ml or above prepared by mixing methacrylic resin polymer of a definite shape having an apparent density of 0.63 g/ml to 0.78 g/ml and methacrylic resin polymer of an indefinite shape having an apparent density of 0.55 g/ml to 0.63 g/ml. The plate thickness accuracy in the width direction is controlled to be within +- 1.0% of the average plate thickness. The methacrylic resin extrusion plate for a light guide plate is preferably used for office automation devices such as a personal computer and a word processor, display devices used for various monitors displaying an image signal such as a panel monitor and a television monitor, display devices used for indoor or outdoor illumination devices and sign boards.
Description
Technical field
The present invention relates to be applicable to business automation equipments such as PC, word processor, the various watch-dogs of display image signals, for example LGP of the display unit of using on the lighting device of employed display unit such as panel monitor, TV monitor and indoor and outdoor spaces, sign board etc. methacrylic resin extrusion plate and manufacture method thereof.
Background technology
The transparent thermoplastic resin, methacrylic resin wherein particularly, so far be widely used in illumination owing to have good light transmission, mechanical property, particularly in recent years, begun to use with LGP as the back of the body irradiation of the display unit that is provided with illuminator lamp etc.As the mode of this back of the body irradiation, use following two kinds usually: LGP is clipped between light source and the liquid crystal cells, i.e. straight-down negative, and the edge light mode that light source is installed in the edge of LGP, the edge light mode has become main flow at present.In recent years, the requirement of the high brightnessization of display unit, maximization, slimming is strengthened, just proceeded research now in line with brighter, bigger, thinner product concept.Especially strong expectation is for the exploitation of the high brightness surface illuminating device of using the edge light mode.
Therefore, in the LGP that on light supply apparatus, uses, also more and more stronger for the needs of the LGP that the incident light that sent by the illuminator that is arranged on the side is penetrated from outgoing plane effectively.
But, common stripper plate, the thickness of slab of the direction of extrusion changes little, and the thickness of slab of width changes greatly, and the incident light that is sent by the illuminator that is arranged on the light supply apparatus penetrates brokenly, and the luminance uniformity variation is so can not get high brightness.
About reach the method for high brightnessization by LGP, also there is multinomial technology open at present.For example, the following method of complex procedures is disclosed: by the light diffusion particle is disperseed to sneak into obtain homogeneous light emitting area in the LGP method (for example, refer to Patent Document 1), and the light scattering type plastic material that comprises the different particle of refractive index by use in LGP reaches method (for example, referring to Patent Document 2) of high brightnessization etc.
Patent documentation 1: Japanese Patent Publication 39-1194 communique
Patent documentation 2: Japanese kokai publication hei 4-145485 communique
Summary of the invention
But, except these uses contain the technology of methacrylic resin of complicated particle, can require fully corresponding level also not reach at present with maximization, the slimming of brightness and speck etc., display unit.
The objective of the invention is to, a kind of LGP methacrylic resin extrusion plate and manufacture method thereof are provided, it is applicable to the various watch-dogs of presentation video signal, for example the display unit of using on the lighting device of employed display unit such as panel monitor, TV monitor and indoor and outdoor spaces, sign board etc.
The inventor is in order to solve above-mentioned problem, carried out deep research, found that, to have by using that unbodied methacrylic resin extruding raw material is mixed in the methacrylic resin extruding raw material with setting with specific ratio, the methacrylic resin plate of extrusion molding is as LGP then, more high brightnessization, reduce speck, thereby finished the present invention.
That is, the invention provides:
(1) a kind of method of making LGP with methacrylic resin extrusion plate, mixing apparent density is the setting methacrylic resin polymer of 0.63g/ml～0.78g/ml and the amorphous methacrylic resin polymer that apparent density is 0.55g/ml～0.63g/ml, apparent density is reached more than the 0.80g/ml, again with the mixture extrusion molding that obtains and obtain stripper plate, making its thickness of slab is 2.0～15.0mm, the thickness of slab precision of width average thickness of slab ± 1.0% in.
(2) according to the manufacture method of above-mentioned (1) described LGP, it is characterized in that described thickness of slab is 3.5～8.5mm with methacrylic resin extrusion plate, and the thickness of slab precision of width average thickness of slab ± 0.5% in.
(3) a kind of LGP methacrylic resin extrusion plate is by above-mentioned (1) or (2) described method manufacturing.
Specifically describe the present invention below.
The methacrylic resin that uses among the present invention can obtain by the monomer copolymerization that makes methyl methacrylate or the EMA more than the 70 weight % and have copolymerization with it.As the monomer that has copolymerization with it, can enumerate butyl methacrylate, EMA, methyl methacrylate, propyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, methacrylic acid-methyl acrylic esters such as 2-Octyl Nitrite, esters of acrylic acids such as methyl acrylate, ethyl acrylate, butyl acrylate, cyclohexyl acrylate, phenyl acrylate, acrylic acid-2-ethyl caproite, unsaturated acids such as methacrylic acid, acrylic acid etc., but be not limited to them.
The setting methacrylic resin extruding raw material that uses among the present invention is meant the methacrylic resin of spherical or cylindric, the flat that is obtained by polymerisation.Amorphous methacrylic resin extruding raw material is meant will become that tabular methacrylic resin formed body carries out pulverization process mechanically and the methacrylic resin that obtains.
The spherical methacrylic resin that uses among the present invention can obtain by suspension polymerization.Suspension polymerization is described.At first, polymerization initiator and chain-transferring agent are dissolved in equably in the monomer mixture of forming by methyl methacrylate or EMA and other monomer.Make this uniform dissolution thing exist low suspension in aqueous medium, under the polymerization temperature of regulation, keep certain hour then, filter the suspendible polymer that this obtains to finish polymerization at dispersion stabilizer, washing, drying, thus obtain spherical methacrylic resin.
The polymerization initiator that uses during as suspension polymerisation can use the well-known radical polymerization initiator that is used for the polymerization of vinyl monomer.For example, can enumerate azodiisobutyronitrile, 2,2 '-azo two (2, the 4-methyl pentane nitrile), dimethyl-2,2 '-azo-bis-isobutyrate, the peroxidating pivalic acid tert-butyl ester, peroxide-2-ethyl hexanoic acid tert-butyl, peroxidating-2 ethyl hexanoic acid isopropylbenzene ester, benzoyl peroxide, lauroyl peroxide etc.The use amount of these radical polymerization initiators, with respect to the monomer or the monomer mixture of 100 weight portions, preferred usually in the scope of 0.01～2.0 weight portion.
The chain-transferring agent that uses during as suspension polymerisation can use the well-known material that is used for Polymerization of Methyl.For example can enumerate tert-butyl mercaptan, normal-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan etc.The use amount of these chain-transferring agents, with respect to the monomer or the monomer mixture of 100 weight portions, preferred usually in the scope of 0.01～2.0 weight portion.
The dispersion stabilizer that uses during as suspension polymerisation, there is no particular limitation, can enumerate slightly water-soluble inorganic compounds such as calcium phosphate, calcium carbonate, aluminium hydroxide, the non-ionic macromolecule compound of polyvinyl alcohol, poly-oxireme, cellulose derivative, the anionic macromolecular compounds such as copolymer of polyacrylic acid and its salt, polymethylacrylic acid and its salt, methacrylate and methacrylic acid and its salt.The use amount of these dispersion stabilizers is with respect to the water of 100 weight portions, preferably in the scope of 0.01～5.0 weight portion.
The water that uses during as suspension polymerisation can be enumerated pure water, ion exchange water, deionized water etc.There is no particular limitation for the use amount of water, with respect to the monomer or the monomer mixture of 100 weight portions, preferably in the scope of 100～250 weight portions.
In addition, the polymerization temperature as suspension polymerisation has no particular limits, and about 60～120 ℃, is the temperature that is fit to employed polymerization initiator.As polyplant, use the aggregation container that is provided with mixer, described mixer has well-known stirring vane, and for example (Pfaudler) blade, propeller blade, burmagin blade etc. are drawn in turbo blade, method Wudu, and baffle plate is housed on this container usually.
And, also can make suspension polymerisations such as releasing agent, colouring agent, ultra-violet absorber, antioxidant, light diffusing agent, plasticizer as required.
After suspension polymerisation is finished, can obtain spherical methacrylic resin polymer thus by well-known method washing, dehydration, drying.
Average grain diameter as the spherical methacrylic resin polymer of important composition factor of the present invention is 0.2～0.5mm, is preferably 0.25～0.39mm.When 0.2mm is above, can obtains good thickness of slab precision, and when 0.5mm is following, can make polymer stabilizing, thereby make with average grain diameter.In addition, if apparent density in 0.70g/ml～0.78g/ml scope, then can obtain good thickness of slab precision.
Then, illustrate as the cylindric of important composition factor of the present invention or flat methacrylic resin polymer.Cylindric methacrylic resin polymer can followingly obtain: will offer the extruder that has passage by the spherical methacrylic resin polymer that above-mentioned suspension polymerisation obtains; in temperature is that 220～260 ℃, passage vacuum pressure are to push under 1.3～8kPa; be squeezed into wire by mould; water-cooled is cut off with line material cutter again.Also can push the methacrylic resin polymer of the molten condition that is obtained by other known solution polymerization process, block polymerization, be squeezed into wire by mould, water-cooled is cut off with line material cutter and is obtained.Flat methacrylic resin polymer is the same with above-mentioned cylindric methacrylic resin polymer, can be with the extruder extruding that has passage, and cutting machine cuts off and obtains under the water again.
As the example of solution polymerization process, block polymerization, the method that can be listed below.Solvent in the solution polymerization process preferably has than destilling tower bottom and the methyl methacrylate monomer of destilling tower inside and material that can be high with the monomer boiling point of methyl methacrylate monomer and methyl methacrylate copolymer.Particularly, can enumerate aromatic compounds such as toluene, dimethylbenzene, ethylbenzene, diethylbenzene, aliphatic compounds such as octane, decane, alicyclic compounds such as decahydronaphthalenes, ester classes such as butyl acetate, amyl acetate, 1,1,2, halogen compounds such as 2-tetrachloroethanes.Alkylbenzene particularly, toluene especially wherein, dimethylbenzene, ethylbenzene have suitable boiling point, and is little to the load of the degassing, and polymerization is not had harmful effect yet, so preferred.Quantity of solvent is also different according to the boiling point of solvent, but the weight of the whole mixtures during based on polymerization, below 30 weight %, preferably below 20 weight %.If do not use solvent during polymerization, then become block polymerization.
Solution polymerization process, the polymerization initiator that uses in the block polymerization is meant and decomposes under polymerization temperature actively and produce the material of free radical, for example can enumerate di-tert-butyl peroxide, the diisopropylbenzyl peroxide, methyl ethyl ketone peroxide, the di-tert-butyl peroxide phthalic acid ester, the di-tert-butyl peroxide benzoic ether, peroxide acetic acid butyl ester, 2,5-dimethyl-2,5-two (tert-butyl peroxide) hexane, 1,1-two (tert-butyl peroxide)-3,3, the 5-trimethyl-cyclohexane, 1,1-two (tert-butyl peroxide) cyclohexane, two t-amyl peroxy things, benzoyl peroxide, lauroyl peroxide, azo two isobutanol diacetate esters, 1,1 '-azo, two cyclohexanenitriles, 2-phenylazo-2,4-dimethyl-4-methoxyl group valeronitrile, 2-cyano group-2,2-propyl group azodicarbonamide, 2,2 '-azodiisobutyronitrile etc.The use amount of these polymerization initiators is that the basis is preferably 0.001～0.03 weight % with the weight of complete reaction mixture.
And the molecular weight regulator that use this moment mainly is a thio-alcohol.As thio-alcohol, for example can enumerate normal-butyl mercaptan, isobutyl group mercaptan, n-octyl mercaptan, n-dodecyl mercaptan, secondary lauryl mercaptan, uncle's lauryl mercaptan, phenyl mercaptan, thiocresol, TGA and its ester and second mercaptoethanol etc.The use amount of these molecular weight regulators is that the basis is preferably 0.01～0.5 weight % with the weight of complete reaction mixture.
The polymerisation machine uses the device that can stir equably with the stirring vane of double helix band shape, dihedral vane type etc.Polymerization is that monomer or monomer solution are offered the polymerisation machine continuously, implements polymerisation under 120～160 ℃ temperature, and the polymerisation conversion of monomer is fixed in fact in 40～70% the scope.When polymerisation conversion 40% when above, by volatile ingredient, the load of devolatilization operation diminishes, for example because the restriction of pre-heater heat-conducting area, the inadequate situation of devolatilization has not existed yet, so preferred.On the other hand, when 70% when following, for example, reduce from the polymerisation machine to the duct pressure loss the pre-heater, the conveying of polymer fluid becomes easily, so preferably.Polymerization temperature is more than 120 ℃ the time, and polymerization speed is practical, and below 160 ℃ the time, polymerization speed is more suitable, adjusts polymerisation conversion easily.In addition, pyrolytic does not descend yet, so preferred.
Polymer fluid by such polymerisation obtains takes out polymer through devolatilization.As the devolatilization device, use the extruder have multistage passage, devolatilization jar etc.Preferably the temperature with 200～290 ℃ makes polymer fluid overheated in pre-heater etc., and offer top then and have sufficient space, and 200～250 ℃, the temperature of 2.7～13kPa, the devolatilization jar under the vacuum, thereby take out polymer.
This polymer is transferred in the extruder continuously with molten condition, by extruder the time, be squeezed into wire by mould, water-cooled is cut off with line material cutter again, obtains cylindric polymer.Flat methacrylic resin polymer is with to make above-mentioned cylindric methacrylic resin polymer the same, and by the extruder extruding, cutting machine cuts off and obtains under the water then.
And, also can before cut-out, use supply pump to add remover, colouring agent, ultra-violet absorber, antioxidant, light diffusing agent, plasticizer etc. as required by the sidepiece of extruder.
As the shape of the cylindric polymer of important composition factor of the present invention, by major diameter (a1), minor axis (b1) and length (L) regulation in cross section.Major diameter (a1), minor axis (b1) are 2.000～4.000mm altogether, and (b1)/(a1)=0.66～1.00, length (L) is 2.000～5.000mm.By making it in this scope, can obtain good thickness of slab precision, so preferred.
As the shape of the flat polymer of important composition factor of the present invention, by major diameter (a2), minor axis (b2) and thickness (T) regulation.Major diameter (a2), minor axis (b2) are 2.000～4.000mm altogether, and (b2)/(a2)=0.66～1.00, thickness (T) is 1.000～3.000mm.By making it in this scope, can obtain good thickness of slab precision, so preferred.
In addition, if the apparent density of cylindric or flat methacrylic resin polymer then can obtain good thickness of slab precision in the scope of 0.63g/ml～0.70g/ml.
Amorphous methacrylic resin polymer as important composition factor of the present invention, can be with the methacrylic resin polymer that obtains by above-mentioned suspension polymerisation, polymerisation in solution, block polymerization by extrusion by melting etc., be molded into tabular material, and this material mechanical ground pulverized and obtain.As pulverizer, can use impact grinder, for example impact crusher, hammer breaker, or shearing pulverizer, for example shredding machine etc.Particularly shredding machine can will be pulverized the product granulation by the size of sieve aperture, so preferred.Screen aperture is used about 8～12mm Φ usually, will offer the present invention by the amorphous methacrylic resin polymer of this sieve.
If the apparent density of this amorphous methacrylic resin polymer then can obtain good thickness of slab precision in the scope of 0.55g/ml～0.63g/ml.
In the present invention, can mix this setting methacrylic resin polymer and this amorphous methacrylic resin polymer and push as methacrylic resin and to use with raw material.About the mixed proportion of this setting methacrylic resin polymer and amorphous methacrylic resin polymer, the apparent density that importantly makes mixture is more than 0.80g/ml.If the apparent density of mixture is more than 0.80g/ml, it is good then can to obtain extrusion stability, the stripper plate that the thickness of slab precision is good.
The preferred mixed proportion of each polymer is according to the size of polymer and difference, when being the polymer particle diameter of the embodiment of the invention, when being 100 weight portions with setting methacrylic resin polymer, amorphous methacrylic resin polymer is 5～380 weight portions, be preferably 10～330 weight portions, more preferably 10～230 weight portions.And, ratio spherical, cylindric and/or flat methacrylic resin polymer in the setting methacrylic resin polymer is the spherical methacrylic resin polymer with respect to 100 weight portions, cylindric and/or flat methacrylic resin polymer is 0～400 weight portion, be preferably 0～250 weight portion, more preferably 0～150 weight portion.
Stripper plate of the present invention can be made by common extrusion by melting.For example, with setting methacrylic resin polymer of the present invention and amorphous methacrylic resin mixture of polymers after 220～300 ℃ of following fusions, be squeezed into tabularly by the T mould, with cutting off behind the final cooling surface of polishing roll, can obtain plate object thus again.
The thickness of slab precision is to be the poor of the maximum of the mean value of the thickness of slab that records with the interval of 50mm on the plate of 1000mm and measuring point and minimum of a value at width.When thickness of slab is 2.0～15.0mm, the thickness of slab precision average thickness of slab ± 1.0% in, preferably in ± 0.5%.
And, when thickness of slab is 3.5～8.5mm, the thickness of slab precision average thickness of slab ± 0.5% in.
The invention effect
Methacrylic resin extrusion plate of the present invention has following effect: the luminous efficiency of the light that can send from illuminator is brought up to maximum, can reduce speck simultaneously.
Description of drawings
Fig. 1 is the figure of expression thickness measurement point of the present invention.
Fig. 2 is the figure of an example of the brightness evaluation method of the edge light mode liquid crystal light supply apparatus of expression by having used LGP of the present invention.
The explanation of label
A: light source (cold-cathode tube)
B: lampshade
C: LGP
D: light reflecting board
E: light diffusing sheet
The specific embodiment
According to embodiment the present invention is described.
(assay method of spherical methacrylic resin polymer average grain diameter)
Use Electromagnetically vibrating screening analyzer (three Tian Cunli grind Industrial Co., Ltd and make, Electromagnetically vibrating AS200DISIT).The sample of 100g is placed on by on higher level's sieve of nominal dimension 500-425-355-300-250-150-less than 7 grades of sieves of being formed of 150, vibration is after 10 minutes in vibrating screen classifier, spherical methacrylic resin polymer on each sieve of weighing, describe to accumulate residual distribution curve, obtain mid diameter, with it as average grain diameter.For the little polymer of average grain diameter, use by nominal dimension 300-250-180-125-100-63-and measure less than 7 grades of sieves of being formed of 63.
(assay method of the major diameter of cylindric methacrylic resin polymer, minor axis, length)
(ミ of Co., Ltd. Star ト ヨ makes, and MDC-25M), major diameter, minor axis, the length of measuring 200 samples arrive 0.001mm, obtain its mean value to use outside micrometer.
(assay method of the major diameter of flat methacrylic resin polymer, minor axis, length)
(ミ of Co., Ltd. Star ト ヨ makes, and MDC-25M), major diameter, minor axis, the length of measuring 200 samples arrive 0.001mm, obtain its mean value to use outside micrometer.
(apparent density)
With JIS K 7365 is that standard is measured.
(thickness measurement of methacrylic resin extrusion plate)
At width shown in Figure 1 is on the plate of 1000mm, and (ミ of Co., Ltd. Star ト ヨ makes, and MDC-25M) is measured to 0.001mm with outside micrometer to 19 of interval 50mm.Obtain the mean value of each measuring point, calculate the thickness of slab precision by maximum, the minimum of a value of this mean value and each measuring point.Thickness of slab precision with maximum ga(u)ge is " thickness of slab precision-A ", and the thickness of slab precision of minimum thickness is " thickness of slab precision-B ".
Thickness of slab precision-A (%)=(maximum-mean value)/mean value * 100 ... (1)
Thickness of slab precision-B (%)=(minimum of a value-mean value)/mean value * 100 ... (2)
(brightness of LGP, the assay method of speck)
With light supply apparatus shown in Figure 2 is standard, the length that will be arranged on LGP as the cold-cathode tube (the electric manufacturing of Ha リ ソ Application) of the 3mm Φ of light source is on two end faces of 319mm side, as light reflecting board, 2 light diffusing sheet D121 (manufacturing of Star ジ デ Application) are housed on the top of LGP with レ イ ホ ワ イ ト 75 (I も と manufacturing).Cold-cathode tube is applied the voltage of 12V by the dc voltage stability device, throw light on after 20 minutes, by being arranged on luminance meter (CA-1000: ミ ノ Le ラ makes), measuring whole light-emitting area is divided into vertical 19 * laterally brightness separately of the measuring point of 19=361 apart from the position of light-emitting area 1m.Then, calculate mean flow rate by 361 that obtain measured value.And, by 361 that obtain measured value, calculate uniformity as the evaluation index of speck by following formula (3).
Luminance uniformity (%)=minimum luminance value/maximum brightness value * 100 ... (3)
(spherical methacrylic resin polymer (polymer-A) manufacturing)
The aluminium hydroxide of the deionized water of the n-octyl mercaptan of the lauroyl peroxide of the methyl methacrylate of 95.0 weight portions, 5.0 parts by weight of acrylic methyl esters, 0.15 weight portion, 0.25 weight portion, 130 weight portions and 0.65 weight portion dropped in 200 liters the polymerization machine, mix.80 ℃ of low suspension polymerizations of reaction temperature 150 minutes,, finish polymerisation substantially then 100 ℃ of following slakings 60 minutes.Polymerization liquid is cooled to 50 ℃ then, drops into dilute sulfuric acid, wash, dewater, the dry processing, obtain melt flow rate (MFR) (ISO-1139-Cond13) and be the spherical methacrylic resin polymer of 1.0g/10 branch (polymer-A).The average grain diameter of polymer-A is 0.39mm, and apparent density is 0.76g/ml.
(cylindric methacrylic resin polymer (polymer-B) manufacturing)
In the monomer mixture of forming by the ethylbenzene of the methyl acrylate of the methyl methacrylate of 79.9 weight %, 5.1 weight % and 15 weight %, add 1 of 150ppm, 1-two (tert-butyl peroxide)-3,3, the n-octyl mercaptan of 5-trimethyl-cyclohexane and 300ppm, in complete mixed type polymerisation machine, under 155 ℃ polymerization temperature, be detained 2.0 hours, polymerization reaches 53% up to polymerisation conversion continuously.Continuously polymer fluid is taken out from the polymerisation machine, then be heated to 260 ℃, and flow down by the interval of heating plate is vertical with heating plate.The devolatilization jar remains on 2.7kPa, 230 ℃, makes polymer and unreacted monomer and separated from solvent.Continuously polymer is transferred in the extruder with molten condition; make it by extruder the time, be squeezed into wire by mould; water-cooled (temperature of water is 60 ℃ a bath); cut off with line material cutter then, obtain melt flow rate (MFR) (ISO 1139 Cond13) and be the cylindric methacrylic resin polymer of 1.0g/10 branch (polymer-B).The major diameter of polymer-B (a1), minor axis (b1), length (L) are respectively (a1) 2.773mm, (b1) 2.689mm, (L) 3.105mm, (b1)/(a1) 0.97, and apparent density is 0.67g/ml.
(flat methacrylic resin polymer (polymer-C) manufacturing)
Cut off with pelleter after replacing in the manufacturing process of polymer-B being squeezed into wire, water-cooled by mould; and use the cutting mode under water that is expressed to underwater cutting by mould to cut off, obtain melt flow rate (MFR) (ISO-1139-Cond13) and be the flat methacrylic resin polymer of 1.0g/10 branch (polymer-C).The major diameter of polymer-C (a2), minor axis (b2), thickness (T) are respectively (a2) 3.178mm, (b2) 3.089mm, (T) 1.505mm, (b2)/(a2) 0.97, and apparent density is 0.68g/ml.
(amorphous methacrylic resin polymer (polymer-D) manufacturing)
Use by having plate 150mm Φ single-screw extrusion machine (barrel temperature: beginning from supply side is 200 ℃-210 ℃-210 ℃-260 ℃-260 ℃-240 ℃), 3 quilts and mix up the polishing roll (roll temperature: 80 ℃) of temperature and the stripper plate forming machine that draw-gear is formed with T mould (mould temperature: 250 ℃), with amount of compression 600Kg/hr extruding, obtaining width is that 1000mm, thickness are the methacrylic resin extrusion plate of 6mm with polymer-A.Then, the pulverizer made from the ホ of Co., Ltd. one ラ イ (U10-30120XLFX type) (sieve: 10mm Φ) above-mentioned stripper plate is pulverized, obtained amorphous methacrylic resin polymer (polymer-D).The apparent density of polymer-D is 0.60g/ml.
Embodiment 1
Use by having plate 150mm Φ single-screw extrusion machine (barrel temperature: beginning from supply side is 200 ℃-210 ℃-210 ℃-260 ℃-260 ℃-240 ℃), 3 quilts and mix up the polishing roll (roll temperature: 80 ℃) of temperature and the stripper plate forming machine that draw-gear is formed with T mould (mould temperature: 250 ℃), the mixture (apparent density 0.83g/ml) of the polymer-D of the polymer-A of 100 weight portions and 50 weight portions with amount of compression 600Kg/hr extruding, is obtained width and is 1000mm, thickness and be the methacrylic resin extrusion plate (stripper plate-A) of 6mm.Thickness measurement point shown in Figure 1 is measured, calculated the thickness of slab precision, the result is as shown in table 1.
Then, it is that 241mm, length are the size of 319mm that the stripper plate that obtains is cut into width with annular saw, use precision lapping machine (PLA-BEAUTY: メ ガ ロ テ Network ニ カ Co., Ltd. makes) to grind the tangent plane of the plate that downcuts then, implement polishing again, be processed into mirror-like at last.Then, apply the site level (dot gradation) of 15 inches sizes, use the printing ink of gorgeous flatting oil (mat medium) SR931 (ミ ノ グ Le one プ manufacturing), on the one side of LGP, carry out serigraphy, obtain LGP with printing screen.The measurement result of brightness, speck is as shown in table 1.
Embodiment 2
Except being the mixture (apparent density is 0.88g/ml) of 100 weight portions with making the combined amount of the polymer-D that uses among the embodiment 1, operation obtains stripper plate-B similarly to Example 1.Carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck, the result is as shown in table 1.
Comparative example 1
Except being the mixture (apparent density is 0.75g/ml) of 400 weight portions with making the combined amount of the polymer-D that uses among the embodiment 1, operation obtains stripper plate-C similarly to Example 1.Carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck, the result is as shown in table 1.
Comparative example 2,3
Polymer-the A (apparent density is 0.76g/ml) that uses among the embodiment 1 is the same with embodiment 1 with polymer-D (apparent density is 0.60g/ml), and extruding separately obtains stripper plate-D and stripper plate-E respectively.Carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck, the result is as shown in table 1.
Embodiment 3
Except the mixture (apparent density is 0.88g/ml) with the polymer-B of polymer-A of using 50 weight portions, 50 weight portions replaced the polymer-A of 100 weight portions that use among the embodiment 1, operation obtained stripper plate-F similarly to Example 1.Carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck, the result is as shown in table 1.
Embodiment 4
Except the polymer-B that replaces using among the embodiment 3 with the mixture (apparent density is 0.87g/ml) that uses polymer-C, carry out operation similarly to Example 1, obtain stripper plate-G.Carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck, the result is as shown in table 1.
Embodiment 5
(result is as shown in table 1 for stripper plate-H), carry out thickness measurement similarly to Example 1, the mensuration of brightness, speck to be shaped to the methacrylic resin extrusion plate of thickness of slab 8mm with the extruding raw material of embodiment 1.
(result's summary)
Discovery is compared with comparative example 1～3, and the brightness of embodiment 1～5, speck be function admirable all.
Table 1
Utilize possibility on the industry
LGP of the present invention can be applied to the business automation equipments such as PC, word processor, the various watch-dogs of display image signals, the display unit of using on the lighting device such as the employed display unit such as panel monitor, TV monitor and indoor and outdoor spaces, sign board etc.
Claims (7)
1. make the method that LGP is used methacrylic resin extrusion plate for one kind, mixing apparent density is the setting methacrylic resin polymer of 0.63g/ml～0.78g/ml and the amorphous methacrylic resin polymer that apparent density is 0.55g/ml～0.63g/ml, apparent density is reached more than the 0.80g/ml, again with the mixture extrusion molding that obtains and obtain stripper plate, making its thickness of slab is 2.0～15.0mm, the thickness of slab precision of width average thickness of slab ± 1.0% in.
2. LGP according to claim 1 is characterized in that with the manufacture method of methacrylic resin extrusion plate described thickness of slab is 3.5～8.5mm, and the thickness of slab precision of width average thickness of slab ± 0.5% in.
3. the LGP according to claim 1 and 2 manufacture method of methacrylic resin extrusion plate, it is characterized in that, as setting methacrylic resin polymer, use spherical methacrylic resin polymer, perhaps use spherical methacrylic resin polymer and be selected from more than in cylindric methacrylic resin polymer, the flat methacrylic resin polymer any one.
4. manufacture method according to claim 3, wherein, the average grain diameter of spherical methacrylic resin polymer is 0.2～0.5mm.
5. manufacture method according to claim 3, wherein, the cross sectional shape of cylindric methacrylic resin polymer is: major diameter and minor axis are 2.000～4.000mm, minor axis/major diameter=0.66～1.00, length is 2.000～5.000mm.
6. manufacture method according to claim 3, wherein, being shaped as of flat methacrylic resin polymer: major diameter and minor axis are 2.000～4.000mm, minor axis/major diameter=0.66～1.00, thickness is 1.000～3.000mm.
7. manufacture method according to claim 1 wherein, with respect to setting methacrylic resin polymer 100 weight portions, is mixed amorphous methacrylic resin polymer 5～380 weight portions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP314281/2004 | 2004-10-28 | ||
| JP2004314281 | 2004-10-28 | ||
| PCT/JP2005/019390 WO2006046481A1 (en) | 2004-10-28 | 2005-10-21 | Optical methacrylic resin extrusion plate manufacturing method |
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| CN101035665A CN101035665A (en) | 2007-09-12 |
| CN101035665B true CN101035665B (en) | 2010-06-16 |
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| CN200580034052XA Expired - Fee Related CN101035665B (en) | 2004-10-28 | 2005-10-21 | Manufacturing method of methacrylic resin extruded sheet for optics |
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| Country | Link |
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| JP (1) | JP4717008B2 (en) |
| KR (1) | KR100857501B1 (en) |
| CN (1) | CN101035665B (en) |
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| CN106567351A (en) * | 2016-10-28 | 2017-04-19 | 河南省路嘉路桥股份有限公司 | Light reflecting stand column cap |
| KR102215705B1 (en) * | 2017-12-15 | 2021-02-18 | 주식회사 엘지화학 | Wearable device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003234005A (en) * | 2001-11-20 | 2003-08-22 | Asahi Kasei Corp | Light guide plate |
| JP2003287626A (en) * | 2002-03-27 | 2003-10-10 | Mitsubishi Rayon Co Ltd | Acrylic resin planar material for light guide plate, method for manufacturing the same, light guide plate and surface light source device and display device containing the same |
| JP2004237645A (en) * | 2003-02-07 | 2004-08-26 | Mitsubishi Rayon Co Ltd | Belt type continuous sheet making apparatus and method for manufacturing sheet polymer |
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| JP4456747B2 (en) * | 2000-10-13 | 2010-04-28 | 住友化学株式会社 | Manufacturing method of resin plate with excellent thickness accuracy |
| JP3960833B2 (en) * | 2002-03-15 | 2007-08-15 | 旭化成ケミカルズ株式会社 | Light guide |
| JP4227812B2 (en) * | 2003-02-06 | 2009-02-18 | 三菱レイヨン株式会社 | Method for producing plate polymer |
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- 2005-10-21 JP JP2006543090A patent/JP4717008B2/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003234005A (en) * | 2001-11-20 | 2003-08-22 | Asahi Kasei Corp | Light guide plate |
| JP2003287626A (en) * | 2002-03-27 | 2003-10-10 | Mitsubishi Rayon Co Ltd | Acrylic resin planar material for light guide plate, method for manufacturing the same, light guide plate and surface light source device and display device containing the same |
| JP2004237645A (en) * | 2003-02-07 | 2004-08-26 | Mitsubishi Rayon Co Ltd | Belt type continuous sheet making apparatus and method for manufacturing sheet polymer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2006046481A1 (en) | 2008-05-22 |
| TWI275477B (en) | 2007-03-11 |
| KR100857501B1 (en) | 2008-09-08 |
| KR20070043815A (en) | 2007-04-25 |
| WO2006046481A1 (en) | 2006-05-04 |
| JP4717008B2 (en) | 2011-07-06 |
| TW200628287A (en) | 2006-08-16 |
| CN101035665A (en) | 2007-09-12 |
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