Crosslinked Rubber Composition and Method for Producing Crosslinked Rubber Composition
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United States of America
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Dec 19, 2024
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Oct 5, 2022
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Oct 5, 2022
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Abstract
A crosslinked rubber composition of a composition including 20 to 50 parts by mass of styrene-butadiene copolymer rubber, 50 to 80 parts by mass of diene rubber, and 20 to 50 parts by mass of an inorganic filler, a total of the styrene-butadiene copolymer rubber and the diene rubber being 100 parts by mass, wherein the styrene-butadiene copolymer rubber has an amount of bound styrene of 20 to 55% by mass, a ratio of an amount of styrene block to the amount of bound styrene of 0.020 to 0.23, an amount of 1,2-bond in a butadiene moiety of 10 to 60% by mass, a Mooney viscosity at 100° C. measured according to JIS K6300-1 of 50 to 80, and a refractive index of 1.5100 to 1.5900, the diene rubber has a refractive index of 1.5000 to 1.5400, and the inorganic filler has a refractive index of 1.3700 to 1.5400.
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