Low-adhesiveness foam sheet

A technology of foam sheet and foam body, which is applied in the fields of foam sheet and electrical/electronic equipment, can solve problems such as difficult peeling and correction, lower yield rate, low surface adhesion, etc., and achieve excellent shock absorption, Prevent damage, thin thickness effect

Active Publication Date: 2016-11-09
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is adhesiveness on the surface of the shock absorbing sheet, it will be difficult to peel it off and correct it when assembling after the misalignment occurs, and the yield rate will decrease. Therefore, a shock absorbing sheet with low surface adhesiveness is desired.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] 100 parts by weight of an acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer (weight ratio 45:48:7)), fatty acid Ammonium-based surfactant (aqueous dispersion of ammonium stearate, solid content 33%) (surfactant A) 2 parts by weight, carboxybetaine-type amphoteric surfactant ("Amogen CB-H", Daiichi Kogyo Pharmaceutical company) (surfactant B) 2 parts by weight, oxazoline-based crosslinking agent ("EPOCROS WS-500" manufactured by Nippon Catalyst Co., Ltd., solid content 39%) 10 parts by weight, pigment (carbon black) (" NAF-5091" (manufactured by Dainichi Seika Kogyo Co., Ltd.) 1 part by weight, polyacrylic acid thickener (ethyl acrylate-acrylic acid copolymer (acrylic acid 20% by weight), solid content 28.7%) were stirred and mixed, and of bubbling. This foaming composition was coated on a PET (polyethylene terephthalate) film (thickness: 38 μm, trade name “MRF#38” manufactured by Mitsubishi Plastics Co., Ltd.) after pee...

Embodiment 2

[0115] 100 parts by weight of an acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer (weight ratio 45:48:7)), fatty acid Ammonium-based surfactant (aqueous dispersion of ammonium stearate, solid content 33%) (surfactant A) 2 parts by weight, carboxybetaine-type amphoteric surfactant ("Amogen CB-H", Daiichi Kogyo Pharmaceutical company) (surfactant B) 2 parts by weight, oxazoline-based crosslinking agent ("EPOCROS WS-500" manufactured by Nippon Catalyst Co., Ltd., solid content 39%) 4 parts by weight, pigment (carbon black) (" NAF-5091" manufactured by Dainichi Seika Kogyo Co., Ltd.) 1 part by weight, polyacrylic acid thickener (ethyl acrylate-acrylic acid copolymer (acrylic acid 20% by weight), solid content 28.7%) 0.6 part by weight, aluminum hydroxide ( 40 parts by weight of "HIGILITE H42" (manufactured by Showa Denko Co., Ltd.) were stirred and mixed to be foamed. This foaming composition was coated on a PET (polyethylene ter...

Embodiment 3

[0117] 100 parts by weight of an acrylic emulsion solution (solid content 55%, ethyl acrylate-butyl acrylate-acrylonitrile copolymer (weight ratio 45:48:7)), fatty acid Ammonium-based surfactant (aqueous dispersion of ammonium stearate, solid content 33%) (surfactant A) 2 parts by weight, carboxybetaine-type amphoteric surfactant ("Amogen CB-H", Daiichi Kogyo Pharmaceutical company) (surfactant B) 2 parts by weight, oxazoline-based crosslinking agent ("EPOCROS WS-500" manufactured by Nippon Catalyst Co., Ltd., solid content 39%) 4 parts by weight, pigment (carbon black) (" NAF-5091 (manufactured by Dainichi Seika Kogyo Co., Ltd.) 1 part by weight, polyacrylic acid thickener (ethyl acrylate-acrylic acid copolymer (acrylic acid 20% by weight), solid content 28.7%) 0.6 part by weight, potassium titanate fiber ("Tismo D" manufactured by Otsuka Chemical Co., Ltd.) 30 parts by weight were stirred and mixed, and foamed. This foaming composition was coated on a PET (polyethylene tere...

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Abstract

A foam sheet is provided which is extremely thin and exhibits excellent shock absorption. This foam sheet is configured from a foam body which has a thickness of 30-500 mum, an apparent density of 0.2-0.7 g/cm3, and an average cell diameter of 10-150 mum. In shock absorption tests using a pendulum impact tester, the value R obtained by dividing the shock absorption rate (%) defined in the specification, by the thickness (mum) of the foam sheet is 0.20 or greater given an impactor weight of 28g and a swing-up angle of 40 degrees, and it holds of at least one surface of the foam sheet that in a 23 DEG C environment, when pressing a cylindrical probe having a diameter phi of 5 mm and made of SUS 304 against said at least one surface with the conditions of a pressing speed of 30 mm/min, a pressing load of 100 gf, and a pressing time of 1 second, and separating said probe therefrom at a separation speed of 30 mm/min, the maximum load value is less than or equal to 100 kN/m2.

Description

technical field [0001] The present invention relates to a foam sheet excellent in impact absorption even if the thickness is small, and an electric / electronic device using the foam sheet. Background technique [0002] Conventionally, image display components fixed to image display devices such as liquid crystal displays, electroluminescent displays, and plasma displays, display components mounted on so-called "mobile phones", "smart phones", and "portable information terminals", and cameras When fixing optical members such as lenses and lenses to predetermined locations (for example, housings, etc.), foam materials are used. As such a foam material, in addition to using a low-foaming and closed-cell structure fine-cell urethane-based foam and a foam obtained by compression-molding high-foaming urethane, there are also used A polyethylene-based foam with an expansion ratio of about 30 times the closed cells, etc. Specifically, for example, the use of the apparent density of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C09J7/02
CPCC08J3/24C08J5/18C08J9/12C08L23/0853C08L25/06C08L33/08C08L2203/20C09J7/20
Inventor 土井浩平加藤和通德山英幸高桥忠男
Owner NITTO DENKO CORP
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