Thermoplastic elastomer composition

A thermoplastic elastomer and composition technology, applied in the field of thermoplastic elastomer composition, can solve the problems of stress relaxation and softness that may not meet the requirements, and achieve the effect of excellent resilience

Inactive Publication Date: 2009-04-15
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the stress relaxation and softness of the elastomer compositions disclosed in Patent Documents 1 and 2 are not necessarily satisfactory, and there is still room for improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6、 comparative example 1-7

[0075] According to the compositions shown in Tables 1 and 2, hydrogenated block copolymers (a-1) to (a-5), rubber softener (b-1), styrene resin (c-1), vinyl resin Mix according to the mass ratio shown in Tables 1 and 2, and then add 0.1% phenolic antioxidant (Iluganox 1010) to the total mass of all ingredients, pre-mix, and then use a Brabender mixer, at 240 ° C Melt kneading for 5 minutes. The obtained thermoplastic elastomer composition was subjected to performance evaluation according to the above-mentioned methods (1) to (3). The results are shown in Tables 1 and 2.

[0076] [Table 1]

[0077] Example 1

[0078] [Table 2]

[0079] comparative example

[0080] As can be seen from the results in Tables 1 and 2, the thermoplastic elastomer compositions obtained in Examples of the present invention are excellent in stress relaxation and rebound resilience.

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Abstract

Disclosed is a thermoplastic elastomer composition which is composed of 35-50 parts by mass of a hydrogenated block copolymer (a) having a weight average molecular weight of 70,000-120,000, 30-50 parts by mass of a softening agent (b) for rubber, and 5-25 parts by mass of a polystyrene resin (c) having a weight average molecular weight of 100,000-400,000 (provided that the total of (a), (b) and (c) is 100 parts by mass). The hydrogenated block copolymer (a) is obtained by hydrogenating a block copolymer having at least two polymer block A's mainly containing a vinyl aromatic compound unit and at least one polymer block B mainly containing a conjugated diene unit. In this hydrogenated block copolymer (a), the vinyl aromatic compound unit is contained in an amount of 35-45% by mass, and not less than 50% of carbon-carbon double bonds respectively derived from the conjugated diene in the polymer block B is hydrogenated.

Description

technical field [0001] This invention relates to thermoplastic elastomer compositions. Background technique [0002] Conventionally, urethane-based thermoplastic elastomers or vulcanized rubbers have been used for elastic films excellent in stress relaxation and resilience. However, films containing urethane-based thermoplastic elastomers are excellent in stress relaxation and resilience, but lack flexibility, and also have problems in water resistance, weather resistance, and the like. In addition, although a film containing vulcanized rubber is soft and excellent in stress relaxation and resilience, it must be vulcanized, so its productivity is low, and it is not thermoplastic, so its recyclability is poor. [0003] Under the above-mentioned circumstances, as thermoplastic elastomer compositions for films that are soft, stress-relaxable, and resilient, for example, [1] containing 20-80% by weight of elastomeric block copolymers, 5-60% by weight of Oil, 3-60% by weight of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08L25/00C08L91/00
CPCC08L53/025C08F8/04C08F297/04C08L2666/04C08L2666/02
Inventor 城后洋祐增田未起男东田升鸟越信一德地一记森口信弘
Owner KURARAY CO LTD
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