Thermoplastic resin foam and foam sealant

A foamed sealing material and thermoplastic resin technology, applied in the field of thermoplastic resin foams and foamed sealing materials, can solve the problems of insufficient recovery itself, inability to fully exert the function of gasket materials, and recovery taking a long time. Effect of dustproof performance

Inactive Publication Date: 2015-02-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when it takes a long time to restore the dent, or the recovery of the dent itself is insufficient, the original function as a gasket material cannot be fully exhibited.

Method used

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  • Thermoplastic resin foam and foam sealant
  • Thermoplastic resin foam and foam sealant
  • Thermoplastic resin foam and foam sealant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] As the resin composition, the following were kneaded at a temperature of 200° C. using a twin-screw kneader.

[0151]

[0152] here,

[0153] Polypropylene is a resin with a melt flow rate (MFR) of 0.35g / 10min,

[0154] The thermoplastic elastomer composition comprises 15% by weight of carbon black and is a blend of polypropylene (PP) and ethylene / propylene / 5-ethylidene-2-norbornene terpolymer (EPT) (cross-linked olefins thermoplastic elastomer, TPV), polypropylene: ethylene / propylene / 5-ethylidene-2-norbornene terpolymer=25:75 (weight basis),

[0155] The lubricant is a masterbatch obtained by mixing 10 parts by weight of polyethylene with 1 part by weight of monoglyceryl stearate,

[0156] The nucleating agent is magnesium hydroxide with an average particle size of 0.8 μm.

[0157] Thereafter, the resin composition was extruded into strands, water-cooled, cut into pellets, and molded.

[0158] The pellets were put into a tandem single-screw extruder manufactured...

Embodiment 2

[0160] A resin foam (sheet shape) was obtained in the same manner as in Example 1 except that 3.7% by weight of carbon dioxide gas was injected into a tandem single-screw extruder manufactured by Nippon Steel Works, Ltd.

Embodiment 3

[0162] A resin foam (sheet shape) was obtained in the same manner as in Example 1 except that 3.5% by weight of carbon dioxide gas was injected into a tandem single-screw extruder manufactured by Nippon Steel Works, Ltd.

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Abstract

The purpose of the present invention is to provide a thermoplastic resin foam and a foam sealant that enable indentations to be sufficiently and rapidly restored. The thermoplastic resin foam is characterized in that the indentation recovery rate defined below is at least 50%, and the foam sealant is characterized by containing the thermoplastic resin foam (in particular, it is preferable an adhesive layer positioned on one or both sides of the thermoplastic resin foam be provided). Indentation recovery rate: After compressing the thermoplastic resin foam at 23°C with a jig having a 90 degree blade angle to the lowest point in the thickness direction of the foam for 15 seconds, and then releasing the compressed state, the indentation recovery rate is the ratio of the thickness of the indented portion with respect to the initial thickness 60 seconds after the compressed state has been released.

Description

technical field [0001] The present invention relates to a thermoplastic resin foam and a foam sealing material. Background technique [0002] Conventionally, resin foams have been used as gasket materials for mobile phones, mobile information terminals, and the like. [0003] As the resin foam, for example, a polyurethane resin foam with low foaming and fine cells with an open-cell structure, compression-molded high-foaming polyurethane, and a foaming ratio of about 30 times with closed cells have been proposed. Polyethylene resin foam, density 0.2g / cm 3 The following polyolefin-based resin foams (see Patent Documents 1 and 2) and the like. [0004] Such a resin foam is usually processed into a predetermined shape and fixed to a predetermined position of these devices, thereby being used as a gasket material for mobile phones, mobile information terminals, and the like. [0005] However, during processing and mounting in this way, there may be bumps against table corners,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12B32B5/18
CPCC08J2423/12C08J2300/22C08J2323/16C08J2323/12C08J2203/08C08J2423/16C08J2201/026C08J2201/03C08J2205/06B32B5/18C08J2205/044C08J2400/26C08J2300/26C09J7/0289C08J2203/06C08J2400/22C08J9/0061C08J9/122C09J7/26
Inventor 加藤和通斋藤诚畑中逸大儿玉清明
Owner NITTO DENKO CORP
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