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:
Jun. 14, 2011
Filed:
Dec. 19, 2005
Hiroshi Yamada, Tokyo, JP;
Kazuhiro Yanagisawa, Tokyo, JP;
Hiroshi Yamada, Tokyo, JP;
Kazuhiro Yanagisawa, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
The present invention provides a natural rubber masterbatch effective in achieving a tread rubber composition which is suitable for heavy-duty tires for rough roads and which is effective in greatly enhancing the abrasion resistance of the tires without impairing the low heat build-up of the tires, a method of producing the natural rubber masterbatch, a rubber composition prepared using the natural rubber masterbatch, and a tire. In a mixing step of mixing a natural rubber latex with a slurry containing water and a carbon black dispersed therein, 10 to 100 weight parts of the carbon black is mixed with 100 weight parts of a natural rubber component in the natural rubber latex. The carbon black satisfies the following conditions: (1) NSA is 120 to 180 m/g; (2) the relationship between 24M4DBP and NSA is represented by the inequality 15≦24M4DBP−0.375NSA≦38; and (3) the Dst of aggregates of the carbon black is represented by the inequality Dst≦65 nm and the ratio (ΔD50/Dst) of the ΔD50 of the carbon black aggregates to the Dst thereof is represented by the inequality ΔD50/Dst≦0.70.