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:
Jul. 27, 1993
Filed:
Apr. 23, 1992
Applicant:
Inventor:
Shinji Misono, Gotenba, JP;
Assignee:
Tokai Carbon Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08K / ;
U.S. Cl.
CPC ...
524496 ; 524495 ; 423445 ;
Abstract
A rubber composition comprising 100 parts by weight of a rubber ingredient compounded with 35-100 parts of a carbon black, said carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of 60-160 m.sup.2 g and a dibutyl phthalate adsorption number (DBP) of 90-150 ml/100 g, and the intraaggregate mode diameter (Dp mode diameter) of the carbon black satisfying the following formula: Dp mode diameter .gtoreq.75.2.times.(DBP/N.sub.2 SA)+8.0 wherein the Dp mode diameter refers to a mode diameter at the maximum frequency in the pore diameter distribution of carbon black particles measured by means of a differential scanning calorimeter (DSC).