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:
Dec. 22, 1998
Filed:
Jan. 11, 1996
The Yokohama Rubber Co., Ltd., Tokyo, JP;
Abstract
A pneumatic tire in which the cap tread portion is composed of a rubber composition comprising (i) 100 parts by weight of a diene rubber having a glass transition temperature (Tg) of not more than -45.degree. C. and (ii) not more than 65 parts by weight of carbon black having a nitrogen specific surface area (N.sub.2 SA) of not less than 140 m.sup.2 /g, a DBP oil absorption of not less than 120 ml/100 g, a .DELTA.DBP of not less than 30 ml/100 g, and a half value (.DELTA.Dst) of distribution of aggregates, measured by a centrifugal precipitation method, of not more than 50 m.mu., or a pneumatic tire in which a cap tread portion is composed of a rubber composition comprising (A) 100 parts by weight of a rubber component mainly comprising natural rubber and polybutadiene rubber and having a hardness at 0.degree. C. of not more than 60 and (B) (i) carbon black having a nitrogen specific surface area (N.sub.2 SA) of not less than 120 m.sup.2 /g and a 24M4DBP of not less than 90 ml/100 g and (ii) a silica in an amount of 5 to 40 parts by weight, with the total weight of the carbon black and silica being not more than 60 parts by weight.