C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
6/37, 18/57, 400
C08G 18/81 (2006.01) A61K 6/09 (2006.01) A61K 6/10 (2006.01) C08G 18/10 (2006.01) C08G 18/67 (2006.01)
Patent
CA 1312402
64053-126 A2/1534 7/26/84 ABSTRACT Disclosed in the present application is a new urethane polyacrylate that has at least one terminal isocyanato acryl pendent radical. Preferably the molecular chain within the acrylate caps has been extended with a polyhydroxy compound just before final end capping with isocyanato acryl. The isocyanato acryl is preferably isocyanatoethyl methacrylate and the urethane is preferably a diisocyanate capped polyether and the polyether radical is preferably oxyalkylene. The method for producing the urethane polyacrylate involves end capping a polyol with diisocyanate yielding a reaction product with two reactive equivalents of isocyanate and then capping less than all of the isocyanate with a hydroxyacrylate, after which the remaining isocyanate is reacted with polyol to provide chain extention. The chain extending polyol is then capped with a isocyanato acryl. The compounds have utility in dental impression compositions that accurately conform to dental surfaces to be recorded.
486491
Dentsply International Inc.
Smart & Biggar
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