Rubber composition, resin modifier comprising the same, and resin composition
AssigneeZeon Corporation
InventorsKatsuhito Kondou, Hiroaki Matsuda, Tetsuya Toyoshima
Life of this patent
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Abstract
A rubber composition comprising (A) 2% to 40% by weight of a conjugated diene polymer selected from (A1) a conjugated diene polymer having a vinyl bond content of at least 60% by weight and (A2) a conjugated diene polymer having a vinyl bond content of at least 30% by weight and a coupling ratio of at least 75% by weight, and (B) 98% to 60% by weight of an aromatic vinyl-conjugated diene copolymer having an aromatic vinyl monomer unit content of 25% to 50% by weight is provided, which has well balanced impact resistance and gloss and is less apt to deteriorate in gloss even in a high-temperature environment.
Claims16
A rubber composition comprising (A) 2% to 40% by weight of a conjugated diene polymer selected from a group consisting of (A1) a conjugated diene polymer having a vinyl bond content of at least 60% by weight based on the conjugated diene monomer units, and (A2) a conjugated diene polymer having a vinyl bond content of at least 30% by weight based on the conjugated diene monomer units and a coupling ratio of at least 75% by weight, and (b) 98% to 60% by weight of an aromatic vinyl-conjugated diene copolymer having an aromatic vinyl monomer unit content of 25% to 50% by weight and a blocked aromatic vinyl content of at least 50% by weight based on the aromatic vinyl monomer units.
A resin modifier comprising as effective ingredients (A) 2% to 40% by weight of a conjugated diene polymer selected from the group consisting of (A1) a conjugated diene polymer having a vinyl bond content of at least 60% by weight based on the conjugated diene monomer units, and (A2) a conjugated diene polymer having a vinyl bond content of at least 30% by weight based on the conjugated diene monomer units and a coupling ratio of at least 75% by weight, and (B) 98% to 60% by weight of an aromatic vinyl-conjugated diene copolymer having an aromatic vinyl monomer unit content of 25% by 50% by weight and a blocked aromatic vinyl content of at least 50% by weight based on the aromatic vinyl monomer units.
Dependencies are inferred from the claim text.