Patent ID: 7625551
Filing Date: 2009-12-01
Classification: A61K,C08G,C08L

Abstract:
1. A dental impression material comprising: (a) a base paste comprising a first base resin and a second base resin, wherein 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 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 X Z is oxygen (O) or sulfur (S), and R