Copolymerizable compositions and method of making the same

摘要

Useful copolymerizable compositions include 10 to 50 parts by weight of (I) a polymerizable diurethane monomer having the general formula <IMAGE> wherein R1 is -H; or -CH3; R2 is -H; -CH3; or -C2H5; R3 is an organic radical constituting the residue of a mono-hydroxy compound R3OH having from one to twelve carbon atoms; and R4 is a divalent organic radical constituting the residue of an organic diisocyanate R4-(NCO)2 from which the two isocyanate radicals have been removed; AND 90 TO 50 PARTS BY WEIGHT OF (II) a polymerizable polyurethane monomer which is the reaction product of (a) an organic diisocyanate; (b) a beta-hydroxy alkyl ester of an acrylic acid; and (c) a polyol.