Dow Corning Corporation

Robin L Willis, Jr

Chi-long Lee

John C Saam

Donnie Ray Juen

Platinum-group metals and compounds thereof are microencapsulated within one or two layers of thermoplastic organic polymers. The layer or layers are deposited using known prior art microencapsulation techniques. The microcapsules can be incorporated into storage-stable one-part polyorganosiloxane compositions that cure by a platinum-catalyzed hydrosilation reaction.

Microencapsulated platinum-group metals and compounds thereof

Compounds of metals from the platinum group of the periodic table compounds are encapsulated within a thermoplastic organic polymer using known prior art techniques. The presence of trace amounts of the encapsulated compound on the surface of the microcapsules is avoided by preparing the microcapsules by in-situ polymerization or precipitation of the encapsulant, followed by washing of the microcapsules with a solvent for the encapsulated compound that will not dissolve or swell the encapsulating polymer.

Method for preparing a microencapsulated compound of a platinum group

Storage stable, one part organosiloxane compositions that cure upon heating by a platinum-catalyzed hydrosilation reaction comprise, in addition to the organosiloxane reactants, a platinum-containing hydrosilation catalyst that is microencapsulated within one or two layers of thermoplastic organic polymers. The microcapsules are formed using known techniques.

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Midland, MI, United States of America

Robin L Willis, Jr