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US 7,923,499 B2Granted
Calcium carbonate treated with curing active ingredient
AssigneeShiraishi Kogyo Kaisha, Ltd.
InventorsTakahiro Kawashima, Shoichi Tsutsui
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AssigneeShiraishi Kogyo Kaisha, Ltd.
InventorsTakahiro Kawashima, Shoichi Tsutsui
Estimating the term…
Disclosed is calcium carbonate treated with a curing active ingredient, which, when compounded in a rubber, enables to provide good workability (handling) to the rubber and maximize advantageous properties of the rubber attributable to calcium carbonate (e.g., slip resistance) without deteriorating the reinforcing property of the rubber. The calcium carbonated treated with a curing active ingredient is produced by mixing a modified calcium carbonate having its surface treated with a fatty acid or a resin acid and silicic acid and having an average primary particle diameter of 0.01 to 0.5 μm with a curing active ingredient which takes a liquid form at ambient temperature so that the content of the curing active ingredient in the finished product becomes 9.1 to 35 wt %.
A rubber composition obtained by incorporating a calcium carbonate treated with a curing active ingredient, a silicic acid and a silicic acid salt in rubber, wherein the calcium carbonate treated with a curing active ingredient is obtained by mixing a curing active ingredient in liquid form at ambient temperature with modified calcium carbonate having a surface treated with a fatty or resin acid and a silicic acid and having a mean primary particle size of 0.01-0.5 μm such that the curing active ingredient content is brought to 9.1-30% by weight.
Dependencies are inferred from the claim text.