Rubber composition
AssigneeShiraishi Kogyo Kaisha, Ltd.
InventorsTakashi Korenaga, Takashi Deguchi, Shoichi Tsutsui
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Abstract
A rubber composition includes a vulcanization promoter composition which comprises a modified calcium carbonate (A) surface-treated with a fatty acid or a resin acid and a silicic acid, an inorganic filler (B) exhibiting an oil absorption of as high as 50 to 300 ml/100 g, and a vulcanization promoter component (C) liquid at ordinary temperatures, characterized in that the (A):(B) mixing ratio is within the range of 30:70 to 95:5 and the content of (C) is 30 to 80 wt % based on the whole of the promoter composition and precipitated silica are blended into a rubber.
Claims8
A rubber composition which is a blend of:
- (1) a powdery white vulcanization promoter composition comprising a modified calcium carbonate (A) surface-treated with a fatty acid and a silicic acid or with a resin acid and a silicic acid;
- a highly oil-absorbing inorganic filler (B) exhibiting an oil absorption of 50 to 300 mL/100 g;
- and a vulcanization promoter (C) which is in a liquid form at ordinary temperature;
- wherein the mixing ratio by weight of the modified carbon calcium (A) to the inorganic filler (B) (the ratio of (A):(B)) is within a range of from 30:70 to 95:5, and the content by percentage of the vulcanization promoter (C) is from 30 to 80% by weight based on the total of the composition;
- and
- (2) a precipitated silica;
- wherein the rubber composition does not contain carbon black.
Dependencies are inferred from the claim text.