Patent ID: 6844409
Filing Date: 2005-01-18
Classification: A61K,C08G,C08K,C08L

Abstract:
1. A curable composition comprising: an olefin-containing resin system comprising at least one oligomer or polymer having a backbone of >50% linear siloxane units, the oligomer or polymer functionalized with olefin groups capable of undergoing a metathesis reaction, wherein the at least one oligomer or polymer is selected from the group consisting of: an oligomer or polymer tethered and end-capped with the groups, a tri-functional oligomer or polymer end-capped with the groups, and a quadri-functional oligomer or polymer end-capped with the groups; and a ruthenium carbene complex catalyst capable of initiating the metathesis reaction in the composition to form a cured article, wherein the catalyst is selected from the group consisting of: (a) a 1,3-bis-(2,4,6-trimethylphenyl)-2-(imidazolidinylidene) dichloro(o-isopropoxyphenylmethylene) ruthenium catalyst having the structure: wherein R is mesityl; and (b) a catalyst having the structure: wherein Cy is cyclohexyl, Ph is phenyl and X is a saturated imidazole ligand having a basicity higher than tricyclohexylphosphine.