Thermoplastic elastomer composition and formed article

A technology of thermoplastic elastomer and composition, which is applied in the field of thermoplastic elastomer composition, can solve the problems that the bending or fixed-length fatigue resistance has not been fully improved, and achieve the effect of excellent bending and fixed-length fatigue resistance and excellent characteristics

Inactive Publication Date: 2009-03-11
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this method improves tensile properties and compression set to some extent, it has not sufficiently improved bending or fixed-length fatigue resistance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Manufacture of carboxyl-containing acrylic rubber (B1)

[0096] First, in a polymerization reactor equipped with a thermometer, a stirring device, a nitrogen inlet pipe and a decompression device, 200 parts of ion-exchanged water, 3 parts of sodium lauryl sulfate, 47 parts of ethyl acrylate, 50 parts of n-butyl acrylate, 1 part of ethylene glycol dimethacrylate and 2 parts of monomethyl fumarate were repeatedly degassed and replaced with nitrogen under reduced pressure to sufficiently remove oxygen. Then, add 0.002 part of sodium formaldehyde sulfoxylate and 0.005 part of cumene hydroperoxide, start emulsion polymerization under 20 ℃ and normal pressure, continue to react until the polymerization conversion rate reaches more than 95%. Use calcium chloride aqueous solution to make The latex was coagulated, washed with water and dried to obtain acrylic rubber (B1). Acrylic rubber (B1) has a gel content of 80%, Mooney viscosity (ML 1+4 , 100°C) was 45. It was confirmed...

Embodiment 2

[0100] Manufacture of epoxy-containing acrylic rubber (B2)

[0101] The composition of the monomer mixture used for polymerization was changed to 47 parts of ethyl acrylate, 50 parts of n-butyl acrylate, 1 part of ethylene glycol dimethacrylate, and 2 parts of glycidyl methacrylate, except , performed the same operation as the acrylic rubber B1, and polymerized to obtain the acrylic rubber (B2). The gel of acrylic rubber (B2) is divided into 75%, Mooney viscosity (ML 1+4 , 100°C) is 40. In the obtained acrylic rubber (B2), it was confirmed that the crosslinking reaction occurred substantially uniformly from the surface layer to the inside of the particle, and the gel component was dispersed at a substantially constant concentration.

[0102] Dynamic crosslinking with polyester polymer (A2)

[0103] The acrylic rubber (B1) was changed to acrylic rubber (B2), and the polyamide-based polymer (A1) was changed to a polyester-based polymer (A2: Polybutylene Terephthalate POLY...

Embodiment 3

[0105] Manufacture of carboxyl-containing hydrogenated nitrile rubber (B3)

[0106] Using a monomer mixture composed of 34 parts of acrylonitrile, 67 parts of butadiene, 2 parts of methacrylic acid and 1 part of divinylbenzene, the polymerization reaction temperature was changed to 10 ° C, except that, the same as in Example 1 The same operation was carried out for emulsion polymerization to obtain the latex of carboxyl group-containing acrylonitrile butadiene rubber (NBR). The obtained carboxyl-containing NBR was hydrogenated with a palladium acetate catalyst to obtain a carboxyl-containing hydrogenated acrylonitrile butadiene rubber (B3; carboxyl-containing HNBR) with a hydrogenation rate of 95%. The gel fraction of the obtained rubber (B3) was 85%. %, Mooney viscosity (ML 1+4 , 100°C) was 80. It was confirmed that the obtained carboxyl group-containing HNBR (B3) had a substantially uniform crosslinking reaction from the surface layer to the inside of the particle, and th...

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Abstract

Disclosed is a thermoplastic elastomer composition which is obtained by mixing a rubber (B) in a polyamide polymer (A1) and / or a polyester polymer (A2) in which rubber not less than 30 weight% of gel component is uniformly dispersed, and dynamically crosslinking the rubber therein. The thermoplastic elastomer composition is excellent in heat resistance, oil resistance and mechanical properties, and also excellent in fatigue resistance against bending and a certain tension.

Description

technical field [0001] The present invention relates to a thermoplastic elastomer composition comprising a polyamide-based polymer or / and a polyester-based polymer, and gel-containing rubber, and more specifically relates to a thermoplastic elastomer composition having excellent heat resistance and oil resistance and further improved mechanical properties thermoplastic elastomer composition. Background technique [0002] A polyamide-based elastomer or a polyester-based elastomer that is a multi-block copolymer composed of polyamide, polyester, and polyether as repeating units, is a thermoplastic elastomer with excellent heat resistance and moderate flexibility. body. However, since these elastomers are applied to various parts as rubber-like elastomers, they have high hardness and are poor in flexibility and deformation recovery. Then, in order to improve this, a method of mixing rubber with the above-mentioned elastomer is known, and various techniques of mixing rubber ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/00C08L77/00C08J3/24C08L9/02C08L21/00C08L33/08C08L71/00C08G69/44C08L77/02C08L77/06
CPCC08L71/00C08L67/00C08L21/00C08L77/02C08G69/44C08L77/06C08L77/00C08L2666/02C08L2666/04
Inventor 增田浩文相村义昭梅津清德
Owner ZEON CORP
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