Patent ID: 7625551

Claim:
A dental impression material comprising: (a) a base paste comprising a first base resin and a second base resin, wherein (1) the first base resin is an urethane polyester carboxylate backbone or an urethane polyether carboxylate backbone, functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction, the first base resin having the formula: wherein: a=1-100, c=0 or 1 and d=2-100, Q is a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S, Z is a linear, branched, cyclic or polycyclic urethane polyether or urethane polyester optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S, and D is a cycloolefinic residue and is different than Q or Z; and (2) the second base resin is an alkoxy-siloxane polyester carboxylate backbone or an alkoxy-siloxane polyether carboxylate backbone, functionalized with at least two cycloolefin groups capable of undergoing a metathesis reaction, the second base resin having the formula: wherein: PE is a polyether or polyester fragment, m=1-500, q=0-10, Q is a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S, and D is a cycloolefinic residue and is different than Q or Z; and (b) a catalyst paste comprising a metal carbene complex catalyst dissolved in a solvent that is miscible with the base paste and capable of initiating the metathesis reaction when the catalyst paste is mixed with the base paste, 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 ), X 2 and X 3 are either the same or different and are any anionic ligand, Z is oxygen (O) or sulfur (S), and R 4 , R 5 , a, b, c, and d are the same or different and are each a linear, branched, cyclic or polycyclic organic residue optionally containing siloxane groups (Si—O—Si) and optionally containing heteroatoms selected from the group consisting of B, N, O, Si, P, and S.