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US 5,207,847 AGranted
Pneumatic tire of low profile having a tie rubber between the tread and sidewall
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsAkinori Tokieda, Masakazu Kojima
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Abstract
A pneumatic tire of a low profile is disclosed which is constructed with a a cap tread, a sidewall and a tie rubber interposed therebetween. The cap tread is formed from a rubber composition comprised of a styrene-butadiene rubber of a high styrene content. The tie rubber comprises a specified sum of a syndiotatic-1,2-butadiene rubber and a cis-1,4-butadiene rubber. Use of the tie rubber is conductive to sufficient adhesion of the tread to the sidewall without shoulder blistering after vulcanization.
Claims2
A pneumatic tire of a low profile having an aspect ratio of smaller than 60% which comprises:
- (a) a cap tread formed from a rubber composition comprising a styrene-butadiene rubber having a styrene content of greater than 28% by weight in an amount of more than 50 parts by weight per 100 parts by weight of the total rubber component;
- (b) a sidewall;
- and
- (c) a tie rubber interposed between said cap thread and said sidewall, said tie rubber comprising a syndiotactic-1,2-butadiene rubber and a cis-1,4-butadiene rubber totalling at or above 50 parts by weight per 100 parts by weight of the total rubber material, said syndiotactic-1,2-butadiene rubber being contained in an amount of at least 30 parts by weight, and a vulcanization accelerator comprising at least 50% by weight, based on the total weight of the accelerator, of a sulfenamide type vulcanization accelerator, whereby said cap tread is disposed to be overlapped at its two opposite sides with two corresponding sides of said sidewall.
1 more element
Dependencies are inferred from the claim text.