Patent ID: 6465541
Filing Date: 2002-10-15
Classification: A61K,C01P,C08K,C09C,Y10S,Y10T

Abstract:
A method of preparing a polymerized composition comprising:(a) providing a polymerizable composition comprising: (i) a cationically active functional group; (ii) an initiation system capable of initiating cationic polymerization of said cationically active functional group; and (iii) a filler composition comprising a radiopacifying filler selected from the group consisting of metal oxides, metal halides, metal borates, metal phosphates, metal silicates, metal carbonates, metal germanates, metal tetrafluoroborates, metal hexafluorophosphates, and combinations thereof, in an amount sufficient to render said polymerizable composition radiopaque, components (i), (ii), and (iii) being selected such that said polymerizable composition is capable of polymerizing to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25Â° C.; wherein said filled composition is selected such that when the amount of said radiopacifying filler is at least 50% by weight of said polymerizable composition, said radiopacifying filler has an isoelectric point, measured according to the Isoelectric Point Test Procedure, of no greater than 7; and (b) initiating polymerization of said cationically active functional group to form said polymerized composition.