Patent ID: 7060770

Claim:
A composition capable of undergoing a metathesis reaction upon mixing its components, the components comprising: an olefin-containing substrate 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: a telechelic oligomer or polymer end-capped with the olefin groups, an oligomer or polymer tethered and end-capped with the olefin groups, a tri-functional oligomer or polymer end-capped with the olefin groups, and a quadri-functional oligomer or polymer end-capped with the olefin groups, and combinations thereof; and a metal carbene complex catalyst capable of initiating the metathesis reaction in the composition, wherein the catalyst has the structure: wherein: M is ruthenium or osmium, X is an alkylidene ligand with basicity higher than that of tricyclohexylphosphine (PCy 3 ), X1 is a neutral electron donor ligand with a basicity lower than that of tricyclohexylphosphine, X 2 and X 3 are either the same or different and are any anionic ligand, and R 1 and R 2 are either the same or different and are each independently hydrogen or a substituent selected from the group consisting of C 1 –C 20 alkyl, C 2 –C 20 alkenyl, C 2 –C 20 alkynyl, aryl, C 1–C 20 carboxylate, C 1 –C 20 alkoxy, C 2 –C 20 alkenyloxy, C 2 –C 20 alkynyloxy, aryloxy, C 2 –C 20 alkoxycarbonyl, C 1 –C 20 alkylthio, C 1 –C 20 alkylsulfonyl and C 1 –C 20 alkylsulfinyl, wherein each of the substituents is substituted or unsubstituted; and a reaction control agent for slowing the progress of the metathesis reaction after mixing the composition components and having the structure: wherein: G is selected from the group consisting of: L 3 , L is a hydrocarbon fragment containing a double or triple bond, L 1 –L 0 are each independently selected from the group consisting of L, alkyl, aryl, aralkyl or haloalkyl, A is a Group 14 atom, n=0–20, and m=0–20.