Patent ID: 6187836
Filing Date: 2001-02-13
Classification: A61K,C08G,Y10S

Abstract:
A photopolymerizable dental composition comprising:(a) a cationically active functional group;(b) a free radically active functional group; and(c) a photoinitiation system capable of initiating, at a reaction temperature less than about 40.degree. C., free radical polymerization of said free radically active functional group after a finite induction period T.sub.1 and cationic polymerization of said cationically active functional group after a finite induction period T.sub.3, where T.sub.3 is greater than T.sub.1,said photoinitiation system comprising:(i) a source of species capable of initiating free radical polymerization of said free radically active functional group and cationic polymerization of said cationically active functional group; and(ii) a cationic polymerization modifier,wherein in the absence of said modifier, cationic polymerization of said cationically active functional group is initiated under the same irradiation conditions at the end of a finite induction period T.sub.2, where T.sub.2 is less than T.sub.3.