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AssigneesThe Yokohama Rubber Co., Ltd., Zeon Corporation
InventorsNaoya Amino, Misao Hiza, Takashi Shirokawa, Masao Nakamura, Koichi Endo
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A rubber composition containing (i) a conjugated diene-based rubber gel having a toluene swelling index of 16 to 70, (ii) a diene-based rubber such as natural rubber, polyisoprene rubber, aromatic vinyl-conjugated diene copolymer rubber and/or polybutadiene rubber, and (iii) an optional carbon black and/or silica and (a) a pneumatic tire using this composition as a high hardness reinforcing layer extending from a bead along a tire sidewalls, in which the fluidity and dimensional stability at the time of extrusion are improved, while maintaining a sufficient hardness of a high hardness reinforced rubber, (b) a pneumatic tire using this composition as two ends of a tire tread extrudate, maintaining a flex fatigue of the two ends of the tread, in which the extrudability and extrusion dimensional stability are improved and (c) a pneumatic tire using the composition as a 1.5 mm to 6 mm thick undertread, in which a high elasticity and relatively thick gauge undertread, and excellent processability and steering stability are provided.
A rubber composition comprising 100 parts by weight of rubber, containing 30 to 85 parts by weight of natural rubber, 0 to 65 parts by weight of an optional aromatic vinyl-conjugated diene copolymer rubber and 40 to 5 parts by weight of a conjugated diene-based rubber gel having a toluene swelling index of 16 to 70, and 60 to 120 parts by weight of carbon black.
A rubber composition comprising 10 to 60 parts by weight of natural rubber, 20 to 75 parts by weight of a polybutadiene rubber containing 90% by weight or more of a cis 1,4-structure and 40 to 5 parts by weight of a conjugated diene-based rubber gel having a toluene swelling index of 16 to 70, wherein the total amount of the rubber is 100 parts by weight.
A tire tread rubber composition comprising 20 to 95 parts by weight of an aromatic vinyl-conjugated diene copolymer rubber (A), 5 to 50 parts by weight of a conjugated diene-based rubber gel (B) having a toluene swelling index of 16 to 70 and 0 to 50 parts by weight of another diene-based rubber (C), wherein the total weight of rubber is 100 parts by weight and wherein the copolymer rubber (A) has a glass transition temperature TgA of −40° C. to −5° C. and wherein the TgA and the TgB of the glass transition temperature of the conjugated diene based rubber gel (B) satisfy the following formula (1):
A tire tread rubber composition comprising 50 to 95 parts by weight of a sulfur-vulcanizable rubber mainly composed of an aromatic vinyl-conjugated diene copolymer and 5 to 50 parts by weight of a conjugated diene-based rubber gel having a toluene swelling index Q of 16 to 70, wherein the total amount of the rubber is 100 parts by weight, and 10 to 150 parts by weight of silica and wherein the following formulae (2) and (3) are satisfied:
A pneumatic tire using a rubber composition containing 50% by weight or more of natural rubber and/or polyisoprene rubber and 5 to 30% by weight of a conjugated diene-based rubber gel with a toluene swell index of 16 to 70 as a 1.5 mm to 6 mm thick undertread.
Dependencies are inferred from the claim text.