Sughrue Mion, PLLC
Natural rubber masterbatch and method of producing the same
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) N2SA is 120 to 180 m2/g; (2) the relationship between 24M4DBP and N2SA is represented by the inequality 15≦24M4DBP−0.375N2SA≦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.
Bridgestone Corporation
C B C C C C C C
C08J B60C C08J C08J C08C C08J C08J C08K
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Kazuhiro Hiroshi
Yanagisawa Yamada