Bis (allyl carbonate) compositions and polymerizates therefrom

A liquid polymerizable composition consisting essentially of from about 35 to 50 weight percent diethylene glycol bis (allyl carbonate), from about 35 to 50 weight percent ethylenically unsaturated polyester having a number average molecular weight from about 1,000 to 2,000, said polyester being the esterification reaction product of C.sub.4 unsaturated dicarboxylic acid, glycol containing from 2 to 4 carbon atoms and C.sub.3 --C.sub.6 saturated dicarboxylic acid, the mole ratio of saturated to unsaturated dicarboxylic acid being from 0.1:1 to 1:1, and from about 5 to 15 weight percent of C.sub.1 -C.sub.2 alkyl ester of C.sub.4 unsaturated dicarboxylic acid.

A clear, cross-linked article of manufacture produced by polymerizing with free-radical initiator a homogeneous blend of from 30 to 55 weight percent diethylene glycol bis (allyl carbonate), from about 20 to 55 weight percent ethylenically unsaturated polyester having a number average molecular weight from about 1,000 to about 1,5000, said polyester being the esterification product of C.sub.4 unsaturated dicarboxylic acid, glycol containing from 2 to 4 carbon atoms, and C.sub.3 -C.sub.6 saturated dicarboxylic acid, the mole ratio of saturated to unsaturated dicarboxylic acid being from about 0.1:1 to 3:1, and from about 5 to 30 weight percent of C.sub.1 -C.sub.2 alkyl ester of C.sub.4 unsaturated dicarboxylic acid.

An ophthalmic lens produced by curing a homogeneous blend of from about 40 to 50 weight percent diethylene glycol bis (allyl carbonate), from about 40 to 50 weight percent ethylenically unsaturated polyester having a number average molecular weight from about 1,000 to 1,500, said polyester being the esterificationm product of C.sub.4 unsaturated dicarboxylic acid, glycol containing from 2 to 4 carbon atoms and C.sub.3 -C.sub.6 saturated dicarboxylic acid, the mole ratio of saturated to unsaturated dicarboxylic acid being from about 0.1:1 to 1:1, and from about 5 to 15 weight percent C.sub.1 -C.sub.2 alkyl ester of C.sub.4 unsaturated dicarboxylic acid.

A liquid polymerizable composition consisting essentially of from about 30 to about 55 weight percent bis(allyl carbonate) of linear or branched alkylene glycols, from about 20 to about 55 weight percent ethylenically unsaturated polyester having a number average molecular weight from 400 and 1000, said polyester being the alcoholysis reaction product of polyhydric alcohol and C.sub.1 -C.sub.2 dialkyl ester of C.sub.4 -C.sub.6 unsaturated dicarboxylic acid, and from about 5 to about 30 weight percent unsaturated monomer selected from the group consisting of C.sub.1 -C.sub.4 alkyl ester of methacrylic acid, C.sub.1 -C.sub.4 alkyl ester of unsaturated C.sub.4 -C.sub.6 dicarboxylic acid, and vinyl ester of C.sub.1 -C.sub.3 saturated monocarboxylic acid.