Thermoplastic elastomer composition
OwnerEiji Sezaki, Takashi Mikami +4inventors
InventorsEiji Sezaki, Takashi Mikami, Tsuyoshi Kanai, Toshio Yoshida, Kikuo Tanaka, Masaaki Saito
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Abstract
A thermoplastic elastomer composition and process comprising a crystalline polyolefin, halogenated butyl rubber, olefin copolymer rubber, polyolefin modified with, e.g., maleic anhydride, and, optionally nitrile rubber, wherein the halogenated butyl rubber is at least partially crosslinked using a metal oxide and/or chloride, e.g., zinc oxide. Crosslinking is achieved under dynamic mixing conditions and the resulting composition has superior strength, performance and processing properties. Furthermore, use of nitrile rubber imparts improved oil resistance to the composition.
Claims24
A thermoplstic elastomer composition comprising (A) 10 to 90 parts by weight of crystalline polyolefin, (B) 10 to 90 parts by weight of halogenated butyl rubber, with the total amount of (A) and (B) being 100 parts by weight, (C) 10 to 120 parts by weight of olefin copolymer rubber composed of two or more monoolefins or two or more monoolefins and a non-conjugated diene, and (D) 1 to 90 parts by weight of modified polyolefin formed by reaction with an unsaturated carboxylic acid or a derivative thereof and optionally (E) 2 to 50 parts by weight of nitrile rubber, said composition being at least partially crosslinked in the presence of a crosslinking agent of a metal oxide and/or a metal chloride.
A process for preparing a thermoplastic elastomer composition comprising (A) 10 to 90 parts by weight of crystalline polyolefin, (B) 10 to 90 parts by weight of halogenated butyl rubber, with the total amount of (A) and (B) being 100 parts by weight, (C) 10 to 120 parts by weight of olefin copolymer rubber composed of two or more monoolefins or two or more monoolefins and a non-conjugated diene, and (D) 1 to 90 parts by weight of modified polyolefin formed by reaction with an unsaturated carboxylic acid or a derivative thereof, and optionally (E) 2 to 50 parts by weight of nitrile rubber, wherein said components (A), (B), (C), (D) and when used (E), are brought into mixing contact with one another in the molten state and a crosslinking agent comprising a metal oxide and/or metal chloride is added to said components and mixing in the molten state is continued until at least partial crosslinking of said composition occurs.
Dependencies are inferred from the claim text.