WO2019189452A1 - 発泡複合シート、粘着テープ、電子部品用クッション材及び電子部品用粘着テープ - Google Patents
発泡複合シート、粘着テープ、電子部品用クッション材及び電子部品用粘着テープ Download PDFInfo
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- WO2019189452A1 WO2019189452A1 PCT/JP2019/013344 JP2019013344W WO2019189452A1 WO 2019189452 A1 WO2019189452 A1 WO 2019189452A1 JP 2019013344 W JP2019013344 W JP 2019013344W WO 2019189452 A1 WO2019189452 A1 WO 2019189452A1
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- resin
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- resin layer
- sheet
- composite sheet
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- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 150000002832 nitroso derivatives Chemical class 0.000 description 1
- 125000001400 nonyl 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])[H] 0.000 description 1
- 125000002347 octyl 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])[H] 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 125000000913 palmityl 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])[H] 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000011990 phillips catalyst Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003349 semicarbazides Chemical class 0.000 description 1
- 239000011359 shock absorbing material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004154 testing of material Methods 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
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/26—Porous or cellular plastics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
Definitions
- the present invention relates to a foamed composite sheet comprising a foamed sheet and a resin layer, an adhesive tape comprising the foamed composite sheet and an adhesive material, and an electronic component cushioning material and an electronic component comprising the electronic component cushioning material and the adhesive material
- the present invention relates to an adhesive tape.
- Patent Document 1 discloses a crosslinked polyolefin resin foam sheet obtained by foaming and crosslinking a foamable polyolefin resin sheet containing a pyrolytic foaming agent (see, for example, Patent Documents 1 and 2). ).
- various types of electronic devices such as mobile phones, personal computers, and other electronic devices such as digital cameras and small video cameras have become thin as the resin foam sheets used inside these electronic devices become smaller and thinner. It is hoped that
- a thin resin foam sheet generally has low impact absorbability and low mechanical strength.
- a thin resin foam sheet generally has low impact resistance and shock absorption, it is difficult to sufficiently function as a buffer when used inside an electronic device.
- resin foam sheets containing an elastomer resin are known. When manufacturing or storing a resin foam sheet, the sheet may be wound on a reel. Particularly, a resin foam sheet containing an elastomer resin is easy to block during winding, and there is a problem when feeding out during use. May occur.
- the present invention has been made in view of the above circumstances, and has an object to provide a foam sheet, an adhesive tape, a cushioning material for electronic parts, and an adhesive tape for electronic parts, which are excellent in shock absorption and mechanical strength. To do.
- Another object of the present invention is to provide a foam sheet that suppresses blocking and is excellent in impact resistance and impact absorption. Furthermore, the present invention provides another electronic component cushion material having high tensile strength, low compressive strength, and excellent reworkability, and an electronic component pressure-sensitive adhesive tape using the electronic component cushion material. Let it be an issue.
- a foamed composite sheet comprising a foamed sheet containing at least one resin selected from the group consisting of an elastomer resin and a polyolefin resin, and a resin layer laminated on at least one surface of the foamed sheet.
- a foamed composite sheet comprising a foamed sheet containing an elastomer resin and a resin layer laminated on at least one surface of the foamed sheet, having an interlayer strength of 0.3 MPa or more and 25% compressive strength
- a foamed composite sheet having a viscosity of 30 to 700 kPa.
- thermoplastic elastomer resin is at least one selected from the group consisting of an olefin elastomer resin, a vinyl chloride elastomer resin, and a styrene elastomer resin.
- Composite sheet is at least one selected from the group consisting of an olefin resin, a vinyl resin, a styrene resin, a urethane resin, a polyester resin, a polyamide resin, and an ionomer resin.
- a cushioning material for electronic parts comprising a plurality of cells made of bubbles, comprising a foamed resin layer containing a polyolefin resin, and a skin resin layer provided on at least one surface of the foamed resin layer and containing a polyethylene resin.
- the electronic component cushion material according to [10] wherein the foamed resin layer has a thickness of 0.05 to 1.5 mm.
- the polyethylene resin is at least one polyethylene resin selected from the group consisting of high density polyethylene (HDPE), linear low density polyethylene (LLDPE), high pressure method low density polyethylene (LDPE), and ethylene ionomer.
- the cushioning material for electronic parts according to any one of [10] to [12] above.
- the ratio of the thickness of the foamed resin layer to the total thickness of the skin resin layer is 1.5 to 300.
- the cushioning material for electronic parts as described in any one of [13].
- Foamed resin layer tensile strength constant ⁇ (Tensile strength of MD of foamed resin layer (MPa)) ⁇ (Tensile strength of TD of foamed resin layer (MPa)) ⁇ 1/2
- Skin resin layer tensile strength constant ⁇ (tensile strength of MD of skin resin layer (MPa)) ⁇ (tensile strength of TD of skin resin layer (MPa)) ⁇ 1/2
- Compressive strength constant 200 / (200 + 25% compressive strength (kPa) of cushion material for electronic parts) (III) [16]
- the electronic component cushion material according to any one of [10] to [15], wherein the foamed resin layer has an expansion ratio of 1.5 to 30 cm 3 / g.
- Adhesive tape for an electronic component comprising the electronic component cushion material according to any one of the above [10] to [19] and an adhesive material provided on at least one surface of the electronic component cushion material Adhesive tape.
- a foam sheet an adhesive tape, a cushioning material for electronic parts, and an adhesive tape for electronic parts, which are excellent in shock absorption and mechanical strength.
- the foam sheet contains an elastomer resin
- the 25% compressive strength is 30 to 700 kPa
- the interlayer strength is 0.3 MPa or more
- the blocking property is suppressed, and the impact resistance and It is further possible to provide a foamed composite sheet having excellent impact absorbability.
- the present invention is a cushioning material for electronic parts using a foamed composite sheet
- the foamed sheet is a foamed resin layer having a plurality of cells made of bubbles and containing a polyolefin resin
- the resin layer contains a polyethylene resin.
- the present invention further exhibits the following effects. That is, in the above case, according to the present invention, a cushioning material for electronic parts having high tensile strength, low compressive strength, and excellent reworkability, and an adhesive tape for electronic parts using the cushioning material for electronic parts are provided. It is even possible to do this.
- FIG. 1 It is a schematic diagram of the test apparatus for evaluating the interlayer intensity
- the foamed composite sheet of the present invention includes a foamed sheet containing at least one resin selected from the group consisting of an elastomer resin and a polyolefin resin, and a resin layer laminated on at least one surface of the foamed sheet. . Since the foamed sheet contains at least one resin selected from the group consisting of an elastomer resin and a polyolefin resin, the foamed sheet is excellent in impact absorption. On the other hand, the resin layer has excellent mechanical strength. Since the foamed composite sheet of the present invention includes such a foam sheet and a resin layer, it is excellent in both impact absorption and mechanical strength. In addition, in this specification, a foam sheet may be called a foamed resin layer.
- the 25% compressive strength of the foamed composite sheet of the present invention is preferably 1.0 to 700 kPa.
- the 25% compressive strength of the foamed composite sheet of the present invention is 1.0 to 700 kPa, the balance between the impact absorption and mechanical strength of the foamed composite sheet is further improved.
- the foamed composite sheet of the present invention when the foamed sheet contains an elastomer resin, suppresses blocking and has more excellent impact resistance because the interlayer strength and 25% compressive strength of the foamed composite sheet are within a predetermined range. And shock absorption. Further, the foamed composite sheet of the present invention uses a foamed composite sheet in which the foamed sheet contains a polyolefin resin and the resin layer contains a polyethylene resin layer as a cushioning material for electronic parts, so that high tensile strength, low compressive strength, and excellent Furthermore, it can have reworkability.
- the foamed composite sheet of the present invention in the case where the foamed sheet contains an elastomer resin is used as the first embodiment, and the foamed composite sheet in which the foamed sheet contains a polyolefin resin and the resin layer contains a polyethylene resin layer is electronic.
- the case where it uses as a cushion material for components is demonstrated as 2nd Embodiment.
- the foamed composite sheet according to the first embodiment of the present invention includes a foamed sheet containing an elastomer resin and a resin layer laminated on at least one surface of the foamed sheet.
- the foamed composite sheet according to the first embodiment of the present invention has a resin layer on at least one surface of the foamed sheet containing the elastomer resin. Can be avoided and blocking is suppressed.
- the foamed composite sheet according to the first embodiment of the present invention is excellent in impact resistance and impact absorbability because the interlayer strength and 25% compressive strength are within the predetermined ranges.
- the interlayer strength of the foamed composite sheet of the first embodiment of the present invention is 0.3 MPa or more. When the interlayer strength is less than 0.3 MPa, the impact resistance of the foamed composite sheet is deteriorated.
- the interlaminar strength mainly represents the tensile strength in the thickness direction of the foamed sheet, that is, the difficulty of breaking the foamed sheet when an external force is generated in the tensile direction of the thickness. It will be excellent.
- the interlayer strength of the foamed composite sheet is preferably 0.32 MPa or more, and more preferably 0.35 MPa or more.
- the upper limit value of the interlayer strength is not particularly limited, but is usually 5 MPa or less.
- the interlayer strength of the foamed composite sheet can be measured by the method described in the examples.
- the measuring method is to measure the maximum load when the foamed composite sheet is pulled in the thickness direction and the sheet breaks (peels).
- the fracture that occurs in the measurement of the interlayer strength of the foamed composite sheet of the first embodiment of the present invention hardly occurs at the interface between the foamed sheet and the resin layer, and mainly occurs inside the foamed sheet. Therefore, the interlayer strength mainly reflects the tensile strength in the thickness direction of the foamed sheet.
- the interlayer strength of the foamed composite sheet can be adjusted by adjusting the type of elastomer resin constituting the foamed sheet, the apparent density of the foamed sheet, and the thickness of the foamed sheet. Furthermore, the interlayer strength of the foamed composite sheet can be adjusted by the 25% compressive strength described later.
- the 25% compressive strength of the foamed composite sheet of the first embodiment of the present invention is 30 to 700 kPa. Within such a range, the impact absorbability is good and the flexibility is also excellent. Moreover, it becomes easy to adjust interlayer intensity
- the 25% compressive strength is preferably 35 to 200 kPa, more preferably 40 to 100 kPa.
- the foamed sheet contains an elastomer resin.
- the elastomer resin is not particularly limited, but is preferably a thermoplastic elastomer resin.
- the thermoplastic elastomer resin include an olefin elastomer resin, a styrene elastomer resin, a vinyl chloride elastomer resin, a polyurethane elastomer resin, a polyester elastomer resin, a polyamide elastomer resin, and the like. Or two or more of them may be used in combination.
- thermoplastic elastomer resin is selected from the group consisting of an olefin elastomer resin, a vinyl chloride elastomer resin, and a styrene elastomer resin from the viewpoint of improving the impact resistance and impact absorbability of the foamed composite sheet. At least one is preferable, and an olefin elastomer resin is more preferable.
- the olefin elastomer resin examples include ethylene- ⁇ -olefin copolymers such as ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), ethylene-butene rubber (EBM), and propylene- ⁇ -olefin copolymers.
- EPM ethylene-propylene rubber
- EPDM ethylene-propylene-diene rubber
- EBM ethylene-butene rubber
- propylene- ⁇ -olefin copolymers examples thereof include a polymer and a crystalline olefin-ethylene / butylene-crystalline olefin copolymer (CEBC).
- CEBC is particularly preferable from the viewpoint of further improving the impact resistance and shock absorption of the foamed composite sheet.
- the crystalline olefin portion of CEBC is preferably a crystalline ethylene polymer, and the ethylene / butylene portion is preferably an amorphous polymer.
- Examples of commercially available products of CEBC include DYNARON manufactured by JSR Corporation.
- vinyl chloride elastomer resin examples include, for example, those obtained by adding a plasticizer to polyvinyl chloride having a high polymerization degree (for example, a polymerization degree of 2,000 or more), those obtained by modifying polyvinyl chloride, and blends thereof with other resins. Thing etc. are mentioned.
- styrene elastomer resin examples include styrene-butadiene-styrene (SBS) block copolymer, styrene-butadiene-butylene-styrene (SBBS) block copolymer, styrene-ethylene-butylene-styrene (SEBS) block copolymer, and hydrogenated styrene.
- SBS styrene-butadiene-styrene
- SBBS styrene-butadiene-butylene-styrene
- SEBS styrene-ethylene-butylene-styrene
- HSBR styrene-ethylene-propylene-styrene
- SEPS styrene-ethylene-propylene-styrene
- SIBS styrene-isobutylene-styrene
- SIBS styrene-isoprene-styrene
- the foamed sheet may contain other resins other than the elastomer resin as long as the effects of the present invention are not hindered, but the elastomer resin should be 70% by mass or more based on the total amount of the resin components in the foamed sheet. Is preferably 90% by mass or more, and more preferably 100% by mass.
- the content of the elastomer resin in the foamed sheet is preferably 70% by mass or more, preferably 90% by mass or more, more preferably 95% by mass or more, and 100% by mass or less. is there.
- the apparent density of the foamed sheet is not particularly limited, but is preferably 0.1 to 0.8 g / cm 3 from the viewpoint of improving impact resistance and impact absorption, and is preferably 0.2 to 0.7 g / cm 3. More preferably, it is cm 3 , and still more preferably 0.3 to 0.6 g / cm 3 .
- the apparent density of the foamed sheet can be measured according to JIS K7222 (2005).
- the thickness of the foamed sheet is not particularly limited, but is preferably 0.05 to 1.5 mm, more preferably 0.07 to 1.0 mm, and further preferably 0.1 to 0.7 mm. preferable.
- the thickness of the resin layer described later is preferably 0.01 to 0.1 mm, more preferably 0.02 to 0.06 mm, thereby reducing the thickness of the foamed composite sheet. Is possible. Since the foamed composite sheet according to the first embodiment of the present invention is excellent in impact resistance and shock absorption even if it is thinned, it can be suitably used for a miniaturized electronic device.
- the thickness of the foam sheet is preferably larger than the total thickness of the resin layer, and the total thickness of the resin layer relative to the thickness of the foam sheet (total thickness of the resin layer / thickness of the foam sheet) is 0.01 to 0.8. It is preferable that it is 0.1 to 0.4. By setting it as such a range, it becomes easy to make interlayer strength and 25% compressive strength into said range.
- the total thickness of the resin layer refers to the thickness of the resin layer when the resin layer is provided only on one side of the foam sheet, and the respective resin provided on both sides when provided on both sides. Means the sum of layer thicknesses.
- the foam sheet is preferably produced by foaming a foamable resin composition containing the above-described elastomer resin and a foaming agent.
- a foaming agent a pyrolytic foaming agent is preferable.
- an organic foaming agent or an inorganic foaming agent can be used.
- Organic foaming agents include azodicarbonamide, azodicarboxylic acid metal salts (such as barium azodicarboxylate), azo compounds such as azobisisobutyronitrile, nitroso compounds such as N, N′-dinitrosopentamethylenetetramine, hydra And hydrazine derivatives such as zodicarbonamide, 4,4′-oxybis (benzenesulfonylhydrazide) and toluenesulfonylhydrazide, and semicarbazide compounds such as toluenesulfonyl semicarbazide.
- azodicarbonamide azodicarboxylic acid metal salts (such as barium azodicarboxylate)
- azo compounds such as azobisisobutyronitrile
- nitroso compounds such as N, N′-dinitrosopentamethylenetetramine
- hydra And hydrazine derivatives such as zodicarbonamide, 4,4′-
- the inorganic foaming agent examples include ammonium carbonate, sodium carbonate, ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium nitrite, sodium borohydride, anhydrous monosodium citrate, and the like.
- an azo compound is preferable and azodicarbonamide is more preferable from the viewpoint of obtaining fine bubbles and from the viewpoints of economy and safety. These may be used alone or in combination of two or more.
- the blending amount of the thermally decomposable foaming agent in the foamable resin composition is preferably 1 to 20 parts by weight, more preferably 2 to 15 parts by weight, and still more preferably 3 to 10 parts by weight with respect to 100 parts by weight of the elastomer resin. .
- the foamable resin composition preferably contains a cell nucleus modifier in addition to the elastomer resin and the pyrolytic foaming agent.
- the cell nucleus modifier include phenol compounds, nitrogen-containing compounds, thioether compounds, zinc compounds such as zinc oxide and zinc stearate, citric acid, and organic compounds such as urea. Nitrogen compounds, thioether compounds, or mixtures thereof are more preferred.
- the blending amount of the cell nucleus adjusting agent is preferably 0.1 to 8 parts by mass, more preferably 0.2 to 5 parts by mass, and further preferably 0.3 to 2.5 parts by mass with respect to 100 parts by mass of the elastomer resin. Part.
- the foamable resin composition contains additives generally used for foams such as antioxidants, heat stabilizers, colorants, flame retardants, antistatic agents, fillers, etc. You may contain.
- the foamed composite sheet of the first embodiment of the present invention has a resin layer on at least one surface of the foamed sheet. By having the resin layer, blocking when winding the foamed composite sheet can be suppressed.
- the resin layer may be provided on one surface of the foamed sheet or may be provided on both surfaces, but is preferably provided on both surfaces from the viewpoint of making blocking easier. .
- the type of the resin layer is not particularly limited, but is at least one selected from the group consisting of olefin resins, vinyl chloride resins, styrene resins, urethane resins, polyester resins, polyamide resins, and ionomer resins. It is preferable that Among these, an olefin resin is preferable from the viewpoint of easily suppressing blocking. Examples of the olefin resin include polyethylene resins and polypropylene resins, and polyethylene resins are preferable.
- polyethylene resin examples include low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-vinyl acetate copolymer containing ethylene as a main component, and ethylene-ethyl containing ethylene as a main component.
- An acrylate copolymer etc. are mentioned.
- high-density polyethylene is preferable because it has relatively high strength even if it is thinned.
- the density of the high density polyethylene is 0.94 g / cm 3 or more, more preferably 0.942 ⁇ 0.970g / cm 3.
- polypropylene resin examples include homopolypropylene, maleic acid-modified polypropylene, chlorinated polypropylene, ethylene-propylene copolymer, butylene-propylene copolymer, and the like.
- the said polypropylene resin may be used independently and may be used combining several types of polypropylene resin.
- the thickness of the resin layer is preferably 0.01 to 0.1 mm, more preferably 0.02 to 0.06 mm. Within such a range, the foamed composite sheet can be thinned, and the 25% compressive strength can be easily adjusted to the above range.
- the kind and thickness of each resin layer may be the same or different.
- the resin layer may contain additives such as an antioxidant, a heat stabilizer, a colorant, a flame retardant, an antistatic agent, and a filler.
- additives such as an antioxidant, a heat stabilizer, a colorant, a flame retardant, an antistatic agent, and a filler.
- the manufacturing method of the foam composite sheet of the 1st Embodiment of this invention is not specifically limited.
- the foamed sheet and the resin layer may be separately prepared and bonded to each other, but it is preferable to manufacture by a method including the following steps I to III.
- (I) Step of obtaining a multilayer laminate sheet comprising a layer made of a foamable resin composition and a resin layer formed on at least one surface of the layer (II)
- the multilayer laminate obtained in step (I) Step of crosslinking sheet (III) Step of obtaining a foamed composite sheet by foaming a layer made of a foamable resin composition of a crosslinked multilayer laminate sheet
- Process (I) Although it does not specifically limit as a method of obtaining a multilayer laminated body sheet in process (I), It is preferable to carry out by coextrusion molding.
- coextrusion molding is as follows. Resin for forming the resin layer, and other additives that are blended as needed are supplied to the first extruder and melt kneaded, and elastomer resin, foaming agent, and additives that are blended as needed Is supplied to a second extruder and melt-kneaded. Next, the resin materials supplied from the first and second extruders are merged and extruded into a sheet shape by a T-die or the like, thereby obtaining a multilayer laminate sheet having a two-layer structure. In the case of this specific example, a multilayer laminate sheet comprising a layer made of a foamable resin composition and a resin layer formed on one surface of the layer can be obtained.
- a multilayer laminate sheet having a three-layer structure in which resin layers are laminated on both sides of the foamable resin composition for example, the following may be performed.
- Resin for forming the resin layer and other additives that are blended as necessary are supplied to the first and third extruders, melt kneaded, elastomer resin, thermal decomposable foaming agent, and if necessary
- the foamable resin composition containing the additive compounded accordingly is supplied to the second extruder and melt-kneaded.
- the resin materials supplied from the first to third extruders are merged so that the composition of the second extruder becomes an intermediate layer, and extruded into a sheet shape by a T die or the like to form three layers.
- a multilayer laminate sheet having a structure can be obtained.
- either the feed block method or the multi-manifold method may be used, but the feed block method is preferable.
- step (II) the multilayer laminate sheet obtained in step (I) is crosslinked.
- a crosslinking method there is a method in which an organic peroxide is blended in advance and the multilayer laminate sheet obtained in the step (I) is heated to crosslink, but in the present invention, the multilayer laminate sheet is ionized. It is preferable to crosslink by irradiation with radiation.
- the ionizing radiation include an electron beam and a ⁇ -ray, and an electron beam is preferable.
- the irradiation dose of ionizing radiation is preferably 30 to 50 kGy, more preferably 35 to 40 kGy.
- step (III) the multilayer laminate sheet crosslinked in step (II) is foamed to foam a layer made of the foamable resin composition.
- the layer made of the foamable resin composition may be treated so that the foaming agent is foamed, but when the foaming agent is a pyrolytic foaming agent, the multilayer laminate sheet is foamed by heating.
- the heating temperature may be equal to or higher than the temperature at which the pyrolytic foaming agent decomposes, and is, for example, about 150 to 320 ° C.
- the method of heating the multilayer laminate sheet is not particularly limited, and examples thereof include a method of heating the multilayer laminate sheet with hot air, a method of heating with infrared rays, a method of heating with a salt bath, a method of heating with an oil bath, and the like. These may be used in combination.
- the foamed composite sheet of the first embodiment of the present invention can be obtained.
- the foamed composite sheet according to the first embodiment of the present invention may include a step of winding it on a reel for manufacturing. It is also possible to store the foamed composite sheet according to the first embodiment of the present invention in a state wound on a reel.
- the use of the foam composite sheet of the first embodiment of the present invention is not particularly limited, for example, it is preferably used inside an electronic device.
- the foamed composite sheet according to the first embodiment of the present invention is excellent in impact resistance and shock absorption even when made relatively thin. Therefore, the foamed composite sheet is suitably used in various portable electronic devices where the space for placing the foamed composite sheet is small. it can. Further, the foamed composite sheet can be used as a picture frame in a portable electronic device. Examples of the portable electronic device include a mobile phone, a camera, a game device, an electronic notebook, and a personal computer.
- the foamed composite sheet according to the first embodiment of the present invention may be used as an adhesive tape to be described later and used inside an electronic device.
- the adhesive tape includes, for example, a foamed composite sheet and an adhesive material provided on at least one surface of the foamed composite sheet.
- the adhesive tape can be bonded to another member via an adhesive material.
- the adhesive tape may be provided with an adhesive material on both sides of the foamed composite sheet, or may be provided with an adhesive material on one side.
- the pressure-sensitive adhesive material only needs to have at least a pressure-sensitive adhesive layer, and may be a single pressure-sensitive adhesive layer laminated on the surface of the foamed composite sheet, or a double-sided pressure-sensitive adhesive sheet affixed to the surface of the foamed composite sheet although it may be, it is preferable that it is a pressure sensitive adhesive layer simple substance.
- a double-sided adhesive sheet is provided with a base material and the adhesive layer provided in both surfaces of the base material. The double-sided pressure-sensitive adhesive sheet is used for bonding one pressure-sensitive adhesive layer to the foamed composite sheet and bonding the other pressure-sensitive adhesive layer to another member.
- an adhesive which comprises an adhesive layer
- an acrylic adhesive, a urethane type adhesive, a rubber-type adhesive etc. can be used.
- a release sheet such as a release paper may be further bonded onto the adhesive material.
- the thickness of the adhesive material is preferably 5 to 200 ⁇ m, more preferably 7 to 150 ⁇ m, and still more preferably 10 to 100 ⁇ m.
- the cushioning material for electronic components of the second embodiment of the present invention includes a foamed resin layer and a skin resin layer provided on at least one surface of the foamed resin layer.
- the foamed resin layer is made of a foam and is provided with a large number of cells made of bubbles.
- the skin resin layer is a resin layer that is non-foamed and does not have cells made of bubbles.
- the electronic component cushion material 20 may include a foamed resin layer 21 and a skin resin layer 22 laminated on only one surface thereof.
- a resin layer 21 and skin resin layers 22 and 22 laminated on both surfaces thereof may be provided.
- the electronic component cushion material 20 is preferably provided with a skin resin layer 22 only on one surface of the foamed resin layer 21.
- the skin resin layer 22 is preferably laminated directly on the foamed resin layer 21 by co-extrusion or the like to be described later, but the foamed resin layer is interposed via another layer such as an adhesive layer as long as the effect of the present invention is not impaired. 21 may be laminated.
- the thickness of the foamed resin layer is preferably 0.05 to 1.5 mm.
- the thickness of the foamed resin layer is more preferably 0.07 to 1.3 mm, still more preferably 0.1 to 1.0 mm.
- the thickness of the skin resin layer is preferably 0.005 to 0.5 mm.
- the thickness of the skin resin layer is more preferably 0.01 to 0.3 mm, and still more preferably 0.02 to 0.1 mm.
- the thickness of the cushioning material for electronic parts according to the second embodiment of the present invention is preferably 0.055 to 2.5 mm.
- the thickness of the cushioning material for electronic parts is 0.055 mm or more, the thickness of the skin resin layer and the foamed resin layer can be suppressed from becoming unnecessarily small, and various functions such as mechanical strength and shock absorption are good. Can be.
- the thickness of the electronic component cushion material is 2.5 mm or less, the electronic component cushion material according to the second embodiment of the present invention can be easily applied to various types of electronic devices having a reduced thickness. Further, it is possible to prevent the skin resin layer from becoming thicker than necessary and impairing the impact absorption and flexibility of the cushioning material for electronic parts.
- the thickness of the cushioning material for electronic parts is preferably 0.08 to 1.9 mm, and more preferably 0.12 to 1.0, in order to improve various performances and facilitate use in a thinned electronic device. 2 mm.
- the ratio of the thickness of the foamed resin layer to the total thickness of the skin resin layer is preferably 1.5 to 300.
- various functions such as mechanical strength and shock absorption of the cushioning material for electronic parts should be made well-balanced. Can do.
- the total thickness of the skin resin layer is the thickness of one skin resin layer when the skin resin layer is provided on only one surface of the foamed resin layer.
- the total thickness of the skin resin layers is the total thickness of the two skin resin layers.
- the ratio of the thickness of the foamed resin layer to the total thickness of the skin resin layer is more preferably 2 to 100, and further preferably 2.5 to 50.
- the foaming ratio of the foamed resin layer is preferably 1.5 to 30 cm 3 / g.
- the expansion ratio of the foamed resin layer is more preferably 2.0 to 20 cm 3 / g, and further preferably 2.5 to 15 cm 3 / g.
- the expansion ratio is obtained by measuring the apparent density and calculating the reciprocal thereof. Moreover, an apparent density can be measured by the method similar to the apparent density of the above-mentioned foamed sheet.
- the average bubble diameter in the MD of the bubbles in the foamed resin layer is preferably 30 to 350 ⁇ m.
- the average cell diameter in the MD of the cells in the foamed resin layer is more preferably 60 to 300 ⁇ m, and still more preferably 100 to 250 ⁇ m.
- the average cell diameter in the TD of the bubbles in the foamed resin layer is preferably 30 to 400 ⁇ m.
- the average cell diameter in the TD of the bubbles in the foamed resin layer is more preferably 60 to 350 ⁇ m, still more preferably 120 to 300 ⁇ m.
- the average cell diameter in the MD and TD of the bubbles in the foamed resin layer is preferably 30 to 375 ⁇ m.
- the average bubble diameter in the MD of the bubbles in the foamed resin layer is 30 to 375 ⁇ m, the flexibility, shock absorption and the like of the cushioning material for electronic parts tend to be good.
- the average cell diameter in the TD of the bubbles in the foamed resin layer is more preferably 60 to 325 ⁇ m, still more preferably 110 to 275 ⁇ m.
- MD means Machine direction and is a direction that coincides with the extrusion direction and the like
- TD means Transverse direction and is a direction orthogonal to MD and is a direction parallel to the sheet surface of the multilayer foam sheet. is there.
- the foamed resin layer has closed cells, and the closed cell rate is 70% or more. As described above, the bubbles included in the foamed resin layer are generally closed cells, and it is easy to improve the shock absorption and the like.
- the closed cell ratio is preferably 80% or more, more preferably 90 to 100%. The closed cell ratio can be determined according to ASTM D2856 (1998).
- the foamed resin layer and skin resin layer are preferably crosslinked.
- the degree of cross-linking of the foamed resin layer and the skin resin layer is preferably 15 to 60% by mass, more preferably 20 to 50% by mass, respectively.
- the 25% compressive strength of the cushioning material for electronic parts is preferably 1.0 to 100 kPa.
- the 25% compressive strength of the cushioning material for electronic parts is more preferably 1.2 to 80 kPa.
- 25% compressive strength of the cushioning material for electronic components was measured according to the method of JIS K 6767. From the viewpoint of mechanical strength, flexibility, impact absorption, etc., the 25% compressive strength of the foamed resin layer is preferably 1.0 to 100 kPa, more preferably 1.2 to 80 kPa.
- the compression strength constant of the cushioning material for electronic parts is an index indicating how much 25% compressive strength is suitable for the cushioning material for electronic parts to be used as the cushioning material for electronic parts.
- the compression strength constant of the cushioning material for electronic parts is preferably 0.5 to 0.995, and preferably 0.6 to 0.994. More preferred.
- the tensile strength of the cushioning material for electronic components is preferably 5 to 30 MPa in MD, 5 to 25 MPa in TD, more preferably 10 to 25 MPa in MD, and 8 to 20 MPa in TD. By making the tensile strength within these ranges, the mechanical strength of the cushioning material for electronic parts can be easily improved. In addition, the tensile strength of the cushioning material for electronic parts is measured according to the method of JIS K6767.
- the tensile strength constant ratio of the cushioning material for electronic parts is an index indicating the balance between the tensile strength in the skin resin layer and the tensile strength in the foamed resin layer.
- the ratio of the tensile strength constant of the cushioning material for electronic parts is the ratio of the tensile strength constant of the skin resin layer tensile strength constant to the foamed resin layer tensile strength constant (skin resin layer tensile strength constant / foamed resin layer tensile strength constant).
- the foamed resin layer tensile strength constant can be calculated by the following formula (I).
- the skin resin layer tensile strength constant can be calculated by the following formula (II).
- Foamed resin layer tensile strength constant ⁇ (Tensile strength of MD of foamed resin layer (MPa)) ⁇ (Tensile strength of TD of foamed resin layer (MPa)) ⁇ 1/2 (I)
- Skin resin layer tensile strength constant ⁇ (tensile strength of MD of skin resin layer (MPa)) ⁇ (tensile strength of TD of skin resin layer (MPa)) ⁇ 1/2 (II)
- the tensile strength constant ratio is set to 1.00.
- the tensile strength constant ratio of the cushioning material for electronic parts is preferably 1 to 50, more preferably 5 to 40, and more preferably 10 to More preferably, it is 30.
- the foamed resin layer tensile strength constant is preferably lower than the skin resin layer tensile strength constant, and is preferably 0.5 to 10. It is more preferably 1 to 8, and further preferably 1 to 3. Further, from the viewpoint of the mechanical strength of the cushioning material for electronic parts, the skin resin layer tensile strength constant is preferably 10 to 60, more preferably 20 to 55, still more preferably 25 to 50. .
- Tensile strength constant ratio x compressive strength constant Tensile strength constant ratio of skin resin layer tensile strength constant calculated by the above formula (II) to foamed resin layer tensile strength constant calculated by the above formula (I) (skin resin layer tensile strength constant / foamed resin layer tensile strength constant) ) Is multiplied by the compression strength constant calculated by the above formula (III), it is preferable that the value is 1.5 or more. When this value is 1.5 or more, the reworkability is easily improved while improving the mechanical strength, flexibility, shock absorption, and the like of the cushioning material for electronic parts. In addition, when the cushioning material for electronic components does not have a skin resin layer, the tensile strength constant ratio is set to 1.00.
- the value obtained by multiplying the tensile strength constant ratio by the compressive strength constant is more preferably 3 or more, further preferably 5 or more, and particularly preferably 10 or more.
- the foamed resin layer contains a polyolefin resin.
- the polyolefin resin contained in the foamed resin layer include a polyethylene resin, a polypropylene resin, and an ethylene-vinyl acetate copolymer. Among these, a polyethylene resin is preferable.
- the skin resin layer contains a polyethylene resin. Examples of the polyethylene resin contained in the foamed resin layer and the skin resin layer include polyethylene resins polymerized with a polymerization catalyst such as a Ziegler-Natta catalyst, a metallocene catalyst, or a chromium catalyst.
- the resin used for the foamed resin layer and the skin resin layer may be the same type as each other, or may be different from each other.
- the foamed resin layer preferably contains a polyethylene resin.
- the catalyst used for the production of the polyethylene resin of the foamed resin layer from the viewpoint of improving the curved surface followability and the step followability because the foamed resin layer and the skin resin layer are uniformly stretched when pulled. It is preferable that it is the same catalyst as the catalyst used for manufacture of a polyethylene resin.
- Examples of the polyethylene resin contained in the foamed resin layer and the skin resin layer include high-density polyethylene (HDPE), high-pressure method low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ethylene ionomer. . These may be used alone or in combination of two or more.
- Examples of the ⁇ , ⁇ -unsaturated carboxylic acid used in the ethylene ionomer include acrylic acid, methacrylic acid, and maleic acid.
- the metal ions used in the ethylene ionomer Na +, K +, Ag +, Cu +, Cu 2+, Ba 2+, Zn 2+, Fe 2+ and the like.
- LLDPE is preferable as the polyethylene resin contained in the foamed resin layer.
- the foamed resin layer contains LLDPE, the cushioning material for electronic parts is given high flexibility and the foamed resin layer can be thinned.
- the LLDPE contained in the foamed resin layer is obtained by copolymerizing ethylene (for example, 75% by mass or more, preferably 90% by mass or more with respect to the total amount of monomers) and a small amount of ⁇ -olefin as necessary. The resulting LLDPE is more preferred.
- ⁇ -olefin examples include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, and 1-octene. Of these, ⁇ -olefins having 4 to 10 carbon atoms are preferred.
- Density polyethylene resin for example, the above LLDPE is preferably 0.870 ⁇ 0.930g / cm 3, more preferably 0.910 ⁇ 0.930g / cm 3.
- the polyethylene resin a plurality of polyethylene resins can be used, and a polyethylene resin outside the above-described density range may be added.
- the polyethylene resin contained in the skin resin layer is preferably at least one polyethylene resin selected from the group consisting of HDPE and LLDPE.
- the skin resin layer provides high tensile strength to the cushioning material for electronic components while maintaining high flexibility due to the foamed resin layer. can do.
- HDPE is more preferable.
- HDPE contained in the skin resin layer is obtained by copolymerizing ethylene (for example, 90% by mass or more, preferably 95% by mass or more with respect to the total amount of monomers) and, if necessary, a small amount of ⁇ -olefin. HDPE is more preferred.
- the ⁇ -olefin is preferably an ⁇ -olefin having 4 to 6 carbon atoms, and specific examples include 1-butene and 1-hexene.
- the density of HDPE is preferably 0.942 g / cm 3 or more, more preferably 0.942 to 0.959 g / cm 3 .
- the polyethylene resin a plurality of polyethylene resins can be used, and a polyethylene resin outside the above-described density range may be added.
- LLDPE contained in a skin resin layer the thing similar to LLDPE contained in a foamed resin layer can be used.
- Metallocene catalyst HDPE, LLDPE and LDPE contained in the foamed resin layer and skin resin layer are preferably produced using a metallocene catalyst.
- the metallocene catalyst include compounds such as a bis (cyclopentadienyl) metal complex having a structure in which a transition metal is sandwiched between ⁇ -electron unsaturated compounds. More specifically, tetravalent transition metals such as titanium, zirconium, nickel, palladium, hafnium, and platinum have one or more cyclopentadienyl rings or their analogs as ligands (ligands). Can be mentioned.
- Such metallocene catalysts have uniform active site properties, and each active site has the same activity.
- a polymer synthesized using a metallocene catalyst has high uniformity in molecular weight, molecular weight distribution, composition, composition distribution, etc., so when a sheet containing a polymer synthesized using a metallocene catalyst is crosslinked, the crosslinking is uniform. Proceed to. Since the uniformly crosslinked sheet is uniformly foamed, the physical properties are easily stabilized. Moreover, since it can extend
- Examples of the ligand include a cyclopentadienyl ring and an indenyl ring. These cyclic compounds may be substituted with a hydrocarbon group, a substituted hydrocarbon group or a hydrocarbon-substituted metalloid group.
- Examples of the hydrocarbon group include a methyl group, an ethyl group, various propyl groups, various butyl groups, various amyl groups, various hexyl groups, 2-ethylhexyl groups, various heptyl groups, various octyl groups, various nonyl groups, and various decyl groups. , Various cetyl groups, phenyl groups and the like.
- the “various” means various isomers including n-, sec-, tert-, and iso-. Moreover, what polymerized the cyclic compound as an oligomer may be used as a ligand. In addition to ⁇ -electron unsaturated compounds, monovalent anion ligands such as chlorine and bromine or divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, arylamides, phosphides, aryls Phosphide or the like may be used.
- monovalent anion ligands such as chlorine and bromine or divalent anion chelate ligands, hydrocarbons, alkoxides, arylamides, aryloxides, amides, arylamides, phosphides, aryls Phosphide or the like may be used.
- metallocene catalysts containing tetravalent transition metals and ligands include cyclopentadienyl titanium tris (dimethylamide), methylcyclopentadienyl titanium tris (dimethylamide), bis (cyclopentadienyl) titanium dichloride, and dimethyl. And silyltetramethylcyclopentadienyl-t-butylamidozirconium dichloride.
- the metallocene catalyst exhibits an action as a catalyst in the polymerization of various olefins by being combined with a specific cocatalyst (promoter).
- Specific examples of the cocatalyst include methylaluminoxane (MAO) and boron compounds.
- the proportion of the cocatalyst used relative to the metallocene catalyst is preferably 100,000 to 1,000,000 mole times, more preferably 50 to 5,000 mole times.
- Ziegler-Natta catalyst and chromium catalyst As the HDPE contained in the skin resin layer, one produced using a Ziegler-Natta catalyst or a chromium catalyst may be used.
- a Ziegler-Natta catalyst for example, a catalyst in which TiCl 4 is supported on a magnesium compound is preferable, and a catalyst in which TiCl 4 is supported on MgCl 2 is more preferable.
- a chromium catalyst a Philips catalyst, a complex chromium catalyst, etc. are mentioned, for example.
- the Phillips catalyst is obtained by supporting a chromium compound on an inorganic oxide carrier and then firing in air to oxidize the chromium compound.
- the inorganic oxide examples include silica, silica-alumina, silica-titania and the like.
- examples of the chromium compound include chromium acetate, tris (acetylacetonate) chromium, chromium trioxide and the like.
- the complex chromium catalyst is, for example, one in which bis (cyclopentadienyl) chromium is supported on silica.
- HDPE is produced by a slurry polymerization process, a solution polymerization system or a gas phase polymerization process using the catalyst. HDPE may also be produced by two-stage polymerization in order to broaden the molecular weight distribution.
- Polyethylene resin may be used alone as the resin contained in each of the foamed resin layer and the skin resin layer, but may be used in combination with other polyolefin resins, for example, in combination with other polyolefin resins described below. May be.
- the ratio of the other polyolefin resin to the polyethylene resin is preferably 40 parts by mass or less, more preferably 30 parts by mass or less, and still more preferably 20 parts by mass or less.
- Examples of the ethylene-vinyl acetate copolymer used as the other polyolefin resin include an ethylene-vinyl acetate copolymer containing 50% by mass or more of ethylene.
- Examples of the polypropylene resin used as another polyolefin resin include polypropylene and a propylene- ⁇ -olefin copolymer containing 50% by mass or more of propylene. These may be used alone or in combination of two or more.
- ⁇ -olefin constituting the propylene- ⁇ -olefin copolymer examples include ethylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1- Among these, ⁇ -olefins having 6 to 12 carbon atoms are preferable.
- the foamed resin layer and the skin resin layer may contain a resin other than the polyolefin resin.
- a resin other than the polyolefin resin for example, a polyamide resin, a polycarbonate resin, a polyester resin, and an elastomer resin such as a hydrogenated styrene-based thermoplastic elastomer (SEBS) can be used.
- SEBS hydrogenated styrene-based thermoplastic elastomer
- the ratio of the resin other than the polyolefin resin to the total amount of the resin is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 10% by mass or less.
- the ratio of the resin other than the polyolefin resin to the total amount of the resin is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 10% by mass or less.
- the foamed resin layer in the electronic component cushion material of the second embodiment of the present invention is preferably a foam formed by foaming a foamable composition containing the resin and a foaming agent.
- the foamed resin layer obtained by foaming is composed of a foam having a large number of cells composed of cells inside, using a resin alone or a resin containing additives as necessary as a matrix resin.
- the foaming agent include a pyrolytic foaming agent, and an organic foaming agent and an inorganic foaming agent can be used as the pyrolytic foaming agent.
- the thermally decomposable foaming agent those having a decomposition temperature higher than the melting temperature of the resin are usually used.
- Specific organic foaming agents include those similar to the organic foaming agents used in the production of the foamed composite sheet of the first embodiment of the present invention.
- an inorganic type foaming agent the thing similar to the inorganic foaming agent used by preparation of the foam composite sheet of the 1st Embodiment of this invention is mentioned.
- an azo compound is preferable and azodicarbonamide is particularly preferable from the viewpoint of obtaining fine bubbles and from the viewpoints of economy and safety.
- These pyrolytic foaming agents can be used alone or in combination of two or more.
- the amount of the thermally decomposable foaming agent in the foamable composition is preferably 0.5 to 20 parts by weight, more preferably 1 to 15 parts by weight, and still more preferably 1 to 10 parts by weight with respect to 100 parts by weight of the resin. It is.
- foamed resin layers that is, foamable compositions
- foams such as antioxidants, heat stabilizers, colorants, flame retardants, antistatic agents, fillers, and decomposition temperature adjusters as necessary.
- Additives used in the above may be blended.
- an antioxidant and a decomposition temperature adjusting agent may be blended.
- the skin resin layer is formed of a resin composition that does not contain a foaming agent, and may be composed of a single resin, or it may contain an antioxidant, a heat stabilizer, a colorant, a difficult resin.
- Various additives such as a flame retardant, an antistatic agent, a filler, and a decomposition temperature adjusting agent may be blended. In these, it is preferable to use antioxidant.
- antioxidant used in the skin resin layer and the foamed resin layer examples include phenolic antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and amine-based antioxidants.
- the content of the antioxidant is preferably 0.1 to 10 parts by mass and more preferably 0.2 to 5 parts by mass with respect to 100 parts by mass of the resin in each of the skin resin layer and the foamed resin layer.
- Specific examples of the decomposition temperature adjusting agent include zinc oxide, zinc stearate, urea and the like.
- the content of the decomposition temperature adjusting agent is preferably 0.01 to 5 parts by mass, more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the resin in each of the skin resin layer and the foamed resin layer.
- the cushioning material for electronic parts according to the second embodiment of the present invention is not particularly limited, but is manufactured by, for example, a method including the following steps (1) to (2).
- the multilayer sheet is preferably formed by coextrusion. Specifically, a resin, a foaming agent, and other additives that are blended as necessary are supplied to the first extruder and melt-kneaded. From the first extruder, a sheet-like foamable composition (that is, Extrude foamable sheet). At the same time, the resin constituting the skin resin layer, and other additives blended as necessary are supplied to the second extruder and melt-kneaded, and the sheet-like resin composition (ie, the second extruder is used). Extrude the resin sheet. And what is necessary is just to laminate
- the multilayer sheet may be formed by a method other than coextrusion.
- a foam sheet and a resin sheet previously formed into a sheet shape may be pressure-bonded between rolls or the like to form a multilayer sheet.
- the method of heating the multilayer sheet includes a method of heating the multilayer sheet with hot air, a method of heating with infrared rays, a method of heating with a salt bath, a method of heating with an oil bath, and the like. May be.
- the heating temperature may be not less than the foaming temperature of the pyrolytic foaming agent, but is preferably 200 to 300 ° C., more preferably 220 to 280 ° C.
- the multilayer sheet may be stretched during the step (2) or in a subsequent step. That is, the foamable sheet may be expanded to form a multilayer foamed sheet, or may be stretched, or may be stretched while foaming the foamable sheet. In this manufacturing method, it becomes easy to obtain the average cell diameter and inter-cell thickness in the above-described ranges by stretching the multilayer foamed sheet.
- the multilayer foamed sheet when the multilayer foamed sheet is stretched after foaming the foamable sheet, the multilayer foamed sheet may be stretched while maintaining the molten state during foaming without cooling the multilayer foam sheet, After the multilayer foamed sheet is cooled, the multilayer foamed sheet may be stretched again by heating it to a molten or softened state.
- the multilayer foam sheet may be stretched in one of MD and TD or in both directions, but is preferably stretched in both directions.
- the stretching of the multilayer foamed sheet is preferably performed so that the thickness of the multilayer foamed sheet is 0.1 to 0.9 times by stretching, more preferably 0.15 to 0.75 times, and still more preferably 0.00. It is performed so as to be 25 to 0.45 times.
- the compressive strength and tensile strength of the multilayer foamed sheet are likely to be good.
- the foamed sheet is prevented from breaking during stretching, or the foaming gas escapes from the foamed resin layer during foaming to significantly reduce the foaming ratio.
- the multilayer foamed sheet may be heated to, for example, 100 to 280 ° C., preferably 150 to 260 ° C. during stretching.
- step (1) and step (2) it is preferable to perform a step of cross-linking the multilayer sheet (cross-linking step) between step (1) and step (2).
- a step of cross-linking the multilayer sheet as a method of crosslinking the multilayer sheet, a method of irradiating the multilayer sheet with ionizing radiation such as electron beam, ⁇ ray, ⁇ ray, ⁇ ray and the like is used.
- the irradiation amount of the ionizing radiation may be adjusted so that the degree of crosslinking of the resulting multilayer foamed sheet is within the desired range described above, but is preferably 1 to 15 Mrad, more preferably 4 to 13 Mrad. .
- the method of manufacturing the cushioning material for electronic parts is not limited to the above method, and may be a method other than the above.
- an organic peroxide may be blended in advance in the foamable composition, and crosslinking may be performed by a method in which the foamable composition is heated to decompose the organic peroxide. Good.
- the cushioning material for electronic parts is used inside an electronic device, for example.
- the cushion material for electronic components of the second embodiment of the present invention can be suitably used in thin electronic devices, for example, various portable electronic devices. Examples of portable electronic devices include notebook personal computers, mobile phones, smartphones, tablets, and portable music devices.
- the cushioning material for electronic components is disposed, for example, between the electronic component and another component, and absorbs an impact applied to the electronic component. Examples of other members include other electronic components, members for supporting electronic components such as a casing of an electronic device, and the like.
- the cushioning material for electronic parts can be used not only as an impact absorbing material for absorbing an impact inside an electronic device but also as a sealing material for filling a gap between members.
- the electronic component pressure-sensitive adhesive tape includes, for example, an electronic component cushion material and an adhesive material provided on at least one surface of the electronic component cushion material.
- the pressure-sensitive adhesive tape for electronic parts can be bonded to another member via an adhesive material.
- the adhesive tape for electronic components may be one in which an adhesive material is provided on both sides of the cushioning material for electronic components, or one in which an adhesive material is provided on one surface.
- An adhesive tape for electronic parts can also be used as an impact absorbing material and a sealing material.
- it is preferable that an adhesive material is provided on the surface in which the skin resin layer was provided in the cushioning material for electronic components. With such a configuration, the cushioning material for electronic components is less likely to be damaged during rework.
- the pressure-sensitive adhesive material only needs to have at least a pressure-sensitive adhesive layer, and may be a single pressure-sensitive adhesive layer laminated on the surface of the electronic component cushion material, or may be affixed to the surface of the electronic component cushion material. It may be a double-sided PSA sheet, but is preferably a single PSA layer. In addition, a double-sided adhesive sheet is provided with a base material and the adhesive layer provided in both surfaces of the base material. The double-sided pressure-sensitive adhesive sheet is used for adhering one pressure-sensitive adhesive layer to the multilayer foamed sheet and bonding the other pressure-sensitive adhesive layer to another member.
- an adhesive which comprises an adhesive layer
- an acrylic adhesive, a urethane type adhesive, a rubber-type adhesive etc. can be used.
- a release sheet such as a release paper may be further bonded onto the adhesive material.
- the thickness of the adhesive material is preferably 5 to 200 ⁇ m, more preferably 7 to 150 ⁇ m, and still more preferably 10 to 100 ⁇ m.
- the measurement method and evaluation method of each physical property are as follows.
- FIG. 1 shows a schematic diagram of a test apparatus for evaluating interlayer strength.
- a primer (“PPX primer” manufactured by Cemedine Co., Ltd.)
- an adhesive 12 (“PPX” manufactured by Cemedine Co., Ltd.) having a diameter of 5 mm was dropped at the center of the applied portion.
- a 25 mm square aluminum jig 13 was placed on the adhesive dripping portion, and the foamed composite sheet and the jig 13 were pressure bonded. Thereafter, the foamed composite sheet was cut along the size of the jig 13.
- a primer was applied to the surface of the cut foamed composite sheet to which the jig 13 was not bonded, and an adhesive 12 having a diameter of 5 mm was dropped onto the center of the applied portion.
- an adhesive 12 having a diameter of 5 mm was dropped onto the center of the applied portion.
- a 10 mm square aluminum jig 14 was placed on the adhesive dripping portion, and the foamed composite sheet and the jig 14 were pressure bonded.
- cuts 15 were made in the foamed composite sheet along the size of the jig 14.
- the adhesive was cured by allowing it to stand at room temperature for 30 minutes to obtain a sample for measuring interlayer strength.
- the interlaminar strength was measured so that the sheet surface of the foamed composite sheet was perpendicular to the tensile direction on a testing machine equipped with a 1 kN load cell (“Tensilon Universal Material Testing Machine” manufactured by A & D Co., Ltd.). A sample was attached. One of the jigs was pulled vertically upward at a speed of 100 mm / min to peel only the 1 cm square area of the foamed composite sheet. The maximum load at this time was measured and used as the first measurement result. The same operation was repeated three times, and the average value was defined as the interlayer strength.
- the peel strength of the foamed composite sheet is a condition in which two foamed composite sheets (280 mm in length and 50 mm in width) are overlapped and pressure-bonded at a load of 3 kg and a temperature of 23 ° C. for 24 hours, and then a tensile angle of 180 ° and a tensile speed of 300 mm / min. It calculated by measuring the strength at the time of peeling.
- the vertical direction of each sheet was overlapped in the same direction. For example, when the foamed composite sheet has a three-layer structure, they were superposed so that the lower layer of one sheet and the upper layer of the other sheet were in contact.
- ⁇ Average bubble diameter> A multilayer foam sheet is cut into a 50mm square, immersed in liquid nitrogen for 1 minute, then cut in the thickness direction along each of MD and TD, and a digital microscope (manufactured by Keyence Corporation, product name VHX-900) is used. I took a 200x magnified photo. In the foamed resin layer of the photographed image, the bubble diameter of MD and the bubble diameter of TD were measured for all the bubbles present on the cut surface of 2 mm in length in each of MD and TD, and the operation was repeated 5 times. And the average value of each bubble diameter of MD and TD of all the bubbles was made into the average bubble diameter of MD and TD.
- the multilayer foamed sheet was cut into dumbbell-shaped No. 1 as defined in JIS K6251 4.1. Using this as a sample, the tensile strength of MD and TD was measured with a tensile tester (product name: Tensilon RTF235, manufactured by A & D) at a measurement temperature of 23 ° C. according to JIS K6767.
- a tensile tester product name: Tensilon RTF235, manufactured by A & D
- ⁇ Tensile strength constant ratio x compressive strength constant> A value obtained by multiplying the tensile strength constant ratio by the compressive strength constant was calculated by the following formulas (I) to (IV). In addition, when the resin sheet was not laminated
- Foamed resin layer tensile strength constant ⁇ (Tensile strength of MD of foamed resin layer (MPa)) ⁇ (Tensile strength of TD of foamed resin layer (MPa)) ⁇ 1/2
- Skin resin layer tensile strength constant ⁇ (tensile strength of MD of skin resin layer (MPa)) ⁇ (tensile strength of TD of skin resin layer (MPa)) ⁇ 1/2
- Compressive strength constant 200 / (200 + 25% compressive strength (kPa) of cushion material for electronic parts)
- Tensile strength constant ratio skin resin layer tensile strength constant / foamed resin layer tensile strength constant (IV)
- Example 1 100 parts by mass of high density polyethylene (HDPE) (manufactured by Nippon Polyethylene Co., Ltd., trade name HJ360, density 0.951 g / cm 3 ) was charged into the first extruder, and melt kneaded.
- HDPE high density polyethylene
- HJ360 high density polyethylene
- CEBC crystalline olefin-ethylene / butylene-crystalline olefin copolymer
- CEBC crystalline olefin-ethylene / butylene-crystalline olefin copolymer
- a foaming aid as a cell nucleus adjuster
- a product name “SB-1018RG” manufactured by ADEKA Corporation was used as a foaming aid. 100 parts by mass of high-density polyethylene (HDPE) (manufactured by Nippon Polyethylene Co., Ltd., trade name HJ360, density 0.951 g / cm 3 ) was charged into the third extruder and melt-kneaded. Next, the resin materials supplied from the first to third extruders are merged and extruded into a sheet shape to form a layer (middle layer) made of a foamable resin composition, and both sides of the middle layer (upper layer and lower layer) A multilayer laminate sheet provided with a resin layer formed on was obtained.
- HDPE high-density polyethylene
- the multilayer laminate sheet is crosslinked by irradiating an electron beam with an acceleration voltage of 500 kV at 30 kGy on both surfaces thereof, and then continuously fed into a foaming furnace maintained at 270 ° C. by hot air and an infrared heater for 90 seconds.
- the multilayer laminate sheet was foamed to obtain a foamed composite sheet in which the middle layer was a foamed sheet and the upper layer and the lower layer were resin layers.
- Table 1 shows the results.
- Example 2 100 parts by mass of high density polyethylene (HDPE) (manufactured by Nippon Polyethylene Co., Ltd., trade name HJ360, density 0.951 g / cm 3 ) was charged into the first extruder and melt kneaded.
- HDPE high density polyethylene
- HJ360 high density polyethylene
- CEBC crystalline olefin-ethylene / butylene-crystalline olefin copolymer
- CEBC crystalline olefin-ethylene / butylene-crystalline olefin copolymer
- a foaming aid as a cell nucleus adjusting agent
- a product name “SB-1018RG” manufactured by ADEKA Corporation was used as a foaming aid.
- the resin materials supplied from the first and second extruders are merged and extruded into a sheet shape, whereby a layer (middle layer) made of a foamable resin composition and one surface of the middle layer (upper layer)
- a multilayer laminate sheet provided with a layer made of the resin composition formed in (1) was obtained.
- the multilayer laminate sheet is crosslinked by irradiating an electron beam with an acceleration voltage of 500 kV at 30 kGy on both surfaces thereof, and then continuously fed into a foaming furnace maintained at 270 ° C. by hot air and an infrared heater for 90 seconds. By heating, the multilayer laminate sheet was foamed to obtain a foamed composite sheet in which the middle layer was a foamed sheet and the upper layer was a resin layer.
- Table 1 shows the results.
- Example 1 In the second extruder, 100 parts by mass of crystalline olefin-ethylene / butylene-crystalline olefin copolymer (CEBC) (trade name: Dynanar 6200P, manufactured by JSR) as an elastomer resin, 5.5 mass of azodicarbonamide as a blowing agent Part, 1.2 parts by mass of foaming aid as a cell nucleus adjusting agent was added and melt-kneaded to obtain a foamable resin composition. As a foaming aid, a product name “SB-1018RG” manufactured by ADEKA Corporation was used. Subsequently, the foamable resin composition was extruded from an extruder to obtain a sheet made of the foamable resin composition.
- CEBC crystalline olefin-ethylene / butylene-crystalline olefin copolymer
- the above sheet was crosslinked by irradiating an electron beam with an acceleration voltage of 500 kV on both surfaces thereof at 30 kGy, and then continuously fed into a foaming furnace maintained at 270 ° C. by hot air and an infrared heater and heated for 90 seconds.
- the above sheet was foamed to obtain a foamed sheet. Table 1 shows the results.
- HDPE high density polyethylene
- HJ360 high density polyethylene
- the multilayer laminate sheet is cross-linked by irradiating an electron beam with an acceleration voltage of 500 kV to 30 kGy on both surfaces, and then continuously fed into a furnace maintained at 270 ° C. by hot air and an infrared heater and heated for 90 seconds.
- a composite sheet having a resin sheet as an intermediate layer and resin layers as an upper layer and a lower layer was obtained.
- the resin materials supplied from the first and second extruders are merged and extruded into a sheet, thereby forming a layer (intermediate layer) made of the resin composition and one surface (upper layer) of the intermediate layer.
- a multilayer laminate sheet provided with the formed resin layer was obtained.
- the multilayer laminate sheet is cross-linked by irradiating an electron beam with an acceleration voltage of 500 kV to 30 kGy on both surfaces, and then continuously fed into a furnace maintained at 270 ° C. by hot air and an infrared heater and heated for 90 seconds.
- a composite sheet having the resin layer as the middle layer and the resin layer as the upper layer was obtained.
- the foamed composite sheet according to the first embodiment of the present invention has an interlaminar strength and a 25% compressive strength within a predetermined range, so that it has excellent impact resistance and impact absorbability and has a low peel strength. I found it hard to king. On the other hand, it was found that a sheet that does not satisfy the requirements of the first embodiment of the present invention has an interlayer strength or 25% compressive strength that is out of a predetermined range and is inferior in impact resistance or the like, or is easily blocked.
- Example 3 A first extruder and a second extruder were prepared. Using a linear low-density polyethylene resin (trade name “Kernel KF283”, manufactured by Nippon Polyethylene Co., Ltd., density: 0.921 g / cm 3 ) obtained by a metallocene catalyst as a polyolefin resin for the foamable sheet, pyrolyzed Azodicarbonamide was used as a mold blowing agent. In addition, zinc oxide (manufactured by Sakai Chemical Industry Co., Ltd., trade name “OW-212F”) is used as a decomposition temperature adjusting agent, and 2,6-di-t-butyl which is a phenolic antioxidant as an antioxidant.
- a linear low-density polyethylene resin trade name “Kernel KF283”, manufactured by Nippon Polyethylene Co., Ltd., density: 0.921 g / cm 3
- pyrolyzed Azodicarbonamide was used as a mold blowing agent.
- -P-cresol was used. 100 parts by mass of a polyolefin resin, 8.0 parts by mass of a pyrolytic foaming agent, 1 part by mass of a decomposition temperature adjusting agent, and 0.5 parts by mass of an antioxidant are supplied to the first extruder and melt kneaded at 130 ° C. Thus, a foamable composition was prepared.
- a high-density polyethylene resin (trade name “HD”, manufactured by Tamapoly Co., Ltd., density: 0.949 g / cm 3 ) obtained by a metallocene catalyst was used as a polyethylene resin for the resin sheet. The polyethylene resin was supplied to the second extruder and melt kneaded at 130 ° C.
- the foamable composition was coextruded from the first extruder and the polyethylene resin was coextruded from the second extruder, and a resin sheet was laminated on one side of the foamable sheet to obtain a multilayer sheet.
- the surface of the multilayer sheet on which the resin sheet is not laminated is irradiated with an electron beam with an acceleration voltage of 500 kV for 4 Mrad to crosslink the multilayer sheet, and then the foamed foam is maintained at 250 ° C. by hot air and an infrared heater.
- the multilayer foamed sheet of Example 3 in which the resin sheet 1 was laminated on one side of the foamed sheet 1 was obtained by continuously feeding into the furnace and heating and foaming.
- Example 4 A linear low-density polyethylene resin (trade name “Kernel KF283”, manufactured by Nippon Polyethylene Co., Ltd., density: 0.921 g / cm 3 ) obtained with a metallocene catalyst was used as the polyethylene resin for the resin sheet. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 4 which laminated
- Example 5 A high-pressure low-density polyethylene resin (trade name “AJ-1” manufactured by Tamapoly Co., Ltd., density: 0.924 g / cm 3 ) obtained with a metallocene catalyst was used as a polyethylene resin for the resin sheet. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 5 which laminated
- AJ-1 high-pressure low-density polyethylene resin manufactured by Tamapoly Co., Ltd., density: 0.924 g / cm 3
- Example 6 An ethylene ionomer (trade name “NC-5”, manufactured by Tamapoly Co., Ltd.), which is a copolymer of ethylene and methacrylic acid, was used as the polyethylene resin for the resin sheet. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 6 which laminated
- NC-5 ethylene ionomer
- Example 7 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 7 which laminated
- Example 7 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 7 which laminated
- Example 8 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 4, and obtained the multilayer foam sheet of Example 8 which laminated
- Example 8 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 4, and obtained the multilayer foam sheet of Example 8 which laminated
- Example 9 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 9 which laminated
- Example 9 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 9 which laminated
- Example 10 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 6, and obtained the multilayer foam sheet of Example 10 which laminated
- Example 10 The blending amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 6.0 parts by mass. Other than that was the same method as Example 6, and obtained the multilayer foam sheet of Example 10 which laminated
- Example 11 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 11 which laminated
- Example 11 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 11 which laminated
- Example 12 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 4, and obtained the multilayer foam sheet of Example 12 which laminated
- Example 12 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 4, and obtained the multilayer foam sheet of Example 12 which laminated
- Example 13 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 13 which laminated
- Example 13 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 13 which laminated
- Example 14 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 6, and obtained the multilayer foam sheet of Example 14 which laminated
- Example 14 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 4.0 parts by mass. Other than that was the same method as Example 6, and obtained the multilayer foam sheet of Example 14 which laminated
- Example 15 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 15 which laminated
- Example 15 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was the same method as Example 3, and obtained the multilayer foam sheet of Example 15 which laminated
- Example 16 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was obtained in the same manner as in Example 4 to obtain a multilayer foamed sheet of Example 16 in which the resin sheet 2 was laminated on one side of the foamed sheet 4.
- Example 17 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 17 which laminated
- Example 17 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was the same method as Example 5, and obtained the multilayer foam sheet of Example 17 which laminated
- Example 18 The amount of the pyrolytic foaming agent was changed from 8.0 parts by mass to 2.0 parts by mass. Other than that was obtained in the same manner as in Example 6 to obtain a multilayer foamed sheet of Example 18 in which the resin sheet 4 was laminated on one side of the foamed sheet 4.
- Comparative Example 5 The resin sheet was not laminated on the foamable sheet, and the thickness of the foamable sheet was adjusted so that the thickness of the foamed sheet was 0.80 mm. Otherwise, the foamed sheet of Comparative Example 5 was obtained in the same manner as in Example 3.
- Comparative Example 7 The resin sheet was not laminated on the foamable sheet, and the thickness of the foamable sheet was adjusted so that the thickness of the foamed sheet was 0.30 mm. Otherwise, the foamed sheet of Comparative Example 7 was obtained in the same manner as in Example 11.
- Comparative Example 8 The resin sheet was not laminated on the foamable sheet, and the thickness of the foamable sheet was adjusted so that the thickness of the foamed sheet was 0.20 mm. Otherwise, the foamed sheet of Comparative Example 8 was obtained in the same manner as in Example 15.
- the foamed sheets 1 to 4 and the resin sheets 1 to 4 were evaluated according to the above evaluation method.
- the evaluation results of the foam sheets 1 to 4 are shown in Table 2, and the evaluation results of the resin sheets 1 to 4 are shown in Table 3.
- the foam sheets 1 to 4 for evaluation were the same as those in Examples 3, 7, 11, and 15 except that the foamable composition was extruded from the first extruder without extruding the polyethylene resin from the second extruder. Each was produced in the same manner as the multilayer foam sheet.
- the resin sheets 1 to 4 for evaluation were the same as the multilayer foam sheets of Examples 3 to 6 except that the polyethylene resin was extruded from the second extruder without extruding the foamable composition from the first extruder. Each was produced by the same method.
- the multilayer foam sheets of Examples 3 to 18 and the foam sheets of Comparative Examples 5 to 8 were evaluated.
- the evaluation results are shown in Tables 4-6.
- the reworkability evaluation is an index indicating whether the reworkability when the adhesive tape is used is good or not in four stages.
- the evaluation was performed based on Comparative Example 5. Specifically, in the case of Examples 3 to 6, the evaluation is “1” when the degree is the same as that of Comparative Example 5, and the evaluation is “2” when the degree is small compared with Comparative Example 5, The evaluation was “3” when it was superior to Comparative Example 5 and the degree thereof was large, and the evaluation was “4” when it was superior to Comparative Example 5 and the degree thereof was larger.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
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| CN201980021692.9A CN112074403B (zh) | 2018-03-29 | 2019-03-27 | 发泡复合片、胶带、电子部件用缓冲材料和电子部件用胶带 |
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| WO2024204827A1 (ja) * | 2023-03-31 | 2024-10-03 | 積水化学工業株式会社 | 発泡体シート、粘着テープ |
| WO2024204824A1 (ja) * | 2023-03-31 | 2024-10-03 | 積水化学工業株式会社 | 発泡体シート及び粘着テープ |
| EP4194196A4 (en) * | 2020-08-07 | 2024-11-27 | Sekisui Chemical Co., Ltd. | MULTILAYER FOAM SHEET |
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| CN119036977B (zh) * | 2024-09-23 | 2025-03-21 | 湖北祥源高新科技有限公司 | 一种复合树脂发泡片材、胶带、显示组件和电子产品 |
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| WO2024204824A1 (ja) * | 2023-03-31 | 2024-10-03 | 積水化学工業株式会社 | 発泡体シート及び粘着テープ |
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| KR20200138235A (ko) | 2020-12-09 |
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