The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1993
Filed:
Jun. 10, 1991
Mitsuru Araki, Hachioji, JP;
Yoshiyuki Morimoto, Kodaira, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A pneumatic tire has a tread with a rubber composition produced by blending a rubber component with a styrene based thermoplastic elastomer. The rubber component is composed mainly of a diene based rubber, and the elastomer is so preliminarily internally crosslinked that tensile stress at a 100% elongation is increased to 10 to 1,000% of that of the styrene based thermoplastic elastomer not internally crosslinked. A pneumatic tire is also disclosed, having a tread portion with a rubber composition blended with a vinyl aromatic hydrocarbon thermoplastic elastomer in an amount of 5-80 parts by weight relative to 100 parts by weight of the rubber component. The vinyl aromatic hydrocarbon thermoplastic elastomer satisfying the following requirements: (1) the elastomer is a vinyl aromatic hydrocarbon-conjugated diene based block type thermoplastic elastomer; (2) the elastomer has a weight ratio between a vinyl aromatic hydrocarbon and a conjugated diene as constituent monomer units thereof being 40/60 to 95/5; (3) a content percentage of the vinyl aromatic hydrocarbon in vinyl aromatic hydrocarbon based segments in the elastomer is not less than 50% by weight; and (4) a weight average molecular weight of the elastomer is not less than 1.times.10.sup.5.