Thermoplastic elastomer composition, joint member, and method for producing the same
AssigneeMCPP Innovation LLC
InventorTadashi Mizuno
Life of this patent
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Abstract
A joint member having a thermoplastic elastomer composition including components (A), (B), and (C). Component (A): a hydrogenated product of a block copolymer including at least two polymer blocks composed primarily of a vinyl aromatic compound and at least one polymer block including butadiene, wherein, in the hydrogenated product of the block copolymer, a proportion of a hydrogenated product (A1) of a block copolymer having a weight-average molecular weight of 300,000 or more is 30% to 100% by mass, Component (B): a hydrocarbon rubber softener, Component (C): a polypropylene resin, Component (D): a crosslinking agent.
Claims15
A joint member comprising a thermoplastic elastomer composition including components (A), (B), and (C) below, wherein an amount of the component (B) is 100 to 140 parts by mass and an amount of the component (C) is 60 to 140 parts by mass relative to 100 parts by mass of the component (A),
- wherein the thermoplastic elastomer composition is formed by performing crosslinking with a component (D), and
- wherein a compression set of the thermoplastic elastomer composition, the compression set being measured under conditions of 70° C., 22 hours, and 25% compression in accordance with JIS K 6262, is 60% or less,
- Component (A):
- a hydrogenated product of a block copolymer including at least two polymer blocks composed primarily of a vinyl aromatic compound and at least one polymer block including butadiene, wherein the hydrogenated product of the block copolymer comprises a hydrogenated product (A1) of a block copolymer having a weight-average molecular weight of 300,000 or more and a hydrogenated product (A2) of a block copolymer having a weight-average molecular weight of 220,000 to 290,000,
- Component (B):
- a hydrocarbon rubber softener,
- Component (C):
- a polypropylene resin,
- Component (D):
- a crosslinking agent
- wherein a melt flow rate of the thermoplastic elastomer composition measured at a temperature of 230° C. and a load of 21.2 N in accordance with JIS K 7210 is 10 to 80 g/10 min.
A method for producing a joint member, the method comprising melt-kneading a thermoplastic elastomer composition including components (A), (B), (C), and (D) below, wherein an amount of the component (B) is 100 to 140 parts by mass and an amount of the component (C) is 60 to 140 parts by mass relative to 100 parts by mass of the component (A), and injection-molding the kneaded thermoplastic elastomer composition,
- Component (A):
- a hydrogenated product of a block copolymer including at least two polymer blocks composed primarily of a vinyl aromatic compound and at least one polymer block including butadiene, wherein the hydrogenated product of the block copolymer comprises a hydrogenated product (A1) of a block copolymer having a weight-average molecular weight of 300,000 or more and a hydrogenated product (A2) of a block copolymer having a weight-average molecular weight of 220,000 to 290,000,
- Component (B):
- a hydrocarbon rubber softener,
- Component (C):
- a polypropylene resin,
- Component (D):
- a crosslinking agent,
- wherein a melt flow rate of the thermoplastic elastomer composition measured at a temperature of 230° C. and a load of 21.2 N in accordance with JIS K 7210 is 10 to 80 g/10 min.
A thermoplastic elastomer composition comprising components (A), (B), and (C) below, wherein an amount of the component (B) is 100 to 140 parts by mass and an amount of the component (C) is 60 to 140 parts by mass relative to 100 parts by mass of the component (A),
- wherein the thermoplastic elastomer composition is formed by performing crosslinking with a component (D), and
- wherein a compression set of the thermoplastic elastomer composition, the compression set being measured under conditions of 70° C., 22 hours, and 25% compression in accordance with JIS K 6262, is 60% or less,
- Component (A):
- a hydrogenated product of a block copolymer including at least two polymer blocks composed primarily of a vinyl aromatic compound and at least one polymer block including butadiene, wherein the hydrogenated product of the block copolymer comprises a hydrogenated product (A1) of a block copolymer having a weight-average molecular weight of 300,000 or more and a hydrogenated product (A2) of a block copolymer having a weight-average molecular weight of 220,000 to 290,000,
- Component (B):
- a hydrocarbon rubber softener,
- Component (C):
- a polypropylene resin,
- Component (D):
- a crosslinking agent,
- wherein a melt flow rate of the thermoplastic elastomer composition measured at a temperature of 230° C. and a load of 21.2 N in accordance with JIS K 7210 is 10 to 80 g/10 min.
Dependencies are inferred from the claim text.