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:
Sep. 09, 1986
Filed:
Mar. 25, 1985
Applicant:
Inventors:
Masanori Kan, Amagasaki, JP;
Hideo Fujiwara, Kyoto, JP;
Assignee:
Toyo Tire and Rubber Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525 99 ; 525196 ; 525237 ; 525314 ; 525901 ;
Abstract
A composition for pneumatic tires including more than 30% of star shaped styrene-butadiene copolymers by solution polymerization with or without one or more types of natural rubbers or diene series synthetic rubbers. The composition value X of the solution polymerization star shaped SBR is obtained by the following equation. ##EQU1## wherein BR is the butadiene component and the vinyl content is the content of 1, 2 bonded butadiene in butadiene component. The value X falls in the range of the lower limit of 26 to the upper limit of 39. And the coupling efficiency of the solution polymerization star shaped SBR is more than 40%.