Soft gel polymers for high temperature use
AssigneeBridgestone Corporation
InventorsJames E. Hall, Xiaorong Wang, Hideo Takeichi, Naruhiko Mashita
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Abstract
The instant invention provides a soft gel composition comprising a hydrogenated block copolymer, a polyphenylene ether and a substantially amorphous polyolefin or hydrogenated polydiene blended in respective proportions sufficient to provide the composition with a Shore A hardness of 30 or less, and a service temperature of up to, and including about 150° C.
Claims24
A composition having a compression set (at 100° C. for 22 hours) of 65% or less as rubber, comprising:
- (a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two polymer blocks composed mainly of a vinyl-substituted aromatic hydrocarbon and at least one polymer block B composed mainly of a conjugated diene,
- (b) 10 to 150 parts by weight of a polymer selected from the group consisting of a homopolymeric polyphenylene ether resin, a copolymeric polyphenylene ether resin and combinations thereof, comprising a binding unit represented by the general formula,
- wherein R1, R2, R3 and R4, which may be the same or different, represent substituents selected from the group consisting of hydrogen, halogen, hydrocarbon groups and substituted hydrocarbon groups, and
- (c) 10 to 500 parts by weight of a substantially amorphous polyolefin or hydrogenated polydiene.
A composition having a compression set (at 100° C. for 22 hours) of 65% or less as rubber, comprising:
- (a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two polymer blocks composed mainly of a vinyl-substituted aromatic hydrocarbon and at least one polymer block B composed mainly of a conjugated diene,
- (b) 10 to 150 parts by weight of a polymer selected from the group consisting of a homopolymeric polyphenylene ether resin, a copolymeric polyphenylene ether resin and combinations thereof comprising a binding unit represented by the general formula,
- wherein R1, R2, R3, and R4, which may be the same or different, represent substituents selected from the group consisting of hydrogen, halogen, hydrocarbon groups, and substituted hydrocarbon groups, and
- (c) 10 to 500 parts by weight of a substantially amorphous polyolefin or hydrogenated polydiene, which is formed from copolymerized monomers of ethylene, propylene, and at least one monomer selected from the group consisting of 1,4-hexadiene and 5-ethylidene-2-norbomene.
A composition having a compression set (JIS K 6301 at 100° C. for 22 hours) of 65 % or less as rubber, comprising:
- (a) 100 parts by weight of a hydrogenated block copolymer obtained by hydrogenating a block copolymer comprising at least two polymer blocks composed mainly of a vinyl-substituted aromatic hydrocarbon and at least one polymer block B composed mainly of a conjugated diene,
- (b) 10 to 150 parts by weight of a polymer selected from the group consisting of a homopolymeric polyphenylene ether resin, a copolymeric polyphenylene ether resin and combinations thereof, and
- (c) 10 to 500 parts by weight of a substantially amorphous polyolefin or hydrogenated polydiene having a weight average molecular weight in the range between 5,000 to 60,000 using polystyrene standards.
A method for forming a soft gel composition comprising:
- blending a hydrogenated block copolymer, a polyphenylene ether and a substantially amorphous polyolefin having a weight average molecular weight in the range between 5,000 and 60,000 blended in respective proportions sufficient to provide the composition with a Shore A hardness of 30 or less, and a service temperature of up to about 150° C.
Dependencies are inferred from the claim text.