Organopolysiloxane composition for viscous fluid couplings
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsShoji Akamatsu, Mari Tateishi, Toshinori Watanabe
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Abstract
An organopolysiloxane composition for viscous fluid couplings permits little torque variation even when used at a high temperature for an extended period of time. The organopolysiloxane composition comprises an organopolysiloxane liquid with a viscosity of 100 to 1,000,000 sq. mm/s and a platinum compound in an amount such that the amount of platinum metal relative to the liquid is 0.1 to 1,000 ppm. The organopolysiloxane liquid is typically a trimethylsiloxy-endblocked polydimethylsiloxane.
Claims7
A process for suppressing torque variation of an organopolysiloxane composition for viscous fluid couplings comprising:
- adding a platinum compound to a composition consisting essentially of an organopolysiloxane liquid;
- wherein the organopolysiloxane liquid has a viscosity at 25.degree. C. of 100 to 1,000,000 sq mm/s;
- the organopolysiloxane has organo- groups bonded to silicon atoms, with the proviso that the organo- groups are selected from the group consisting of substituted and unsubstituted monovalent hydrocarbon groups;
- the platinum compound is added in an amount such that 0.1 to 1,000 ppm of platinum metal, based on the weight of the organopolysiloxane liquid, is present;
- and wherein the platinum compound is selected from the group consisting of chloroplatinic acid, alcohol solutions of chloroplatinic acid, olefin complexes of platinum, carbonyl complexes of platinum, and alkenylsiloxane complexes of platinum.
Dependencies are inferred from the claim text.