Patent ID: 6271328
Filing Date: 2001-08-07
Classification: C08F,G02B

Abstract:
Liquid compositions, polymerizable by a free-radical route to yield optical articles possessing a high refractive index, comprising:(a) from 20 to 80 percent by weight of an allyl-carbonate derivative represented by the formula ##STR6##wherein:R.sub.1 is selected from the group consisting of a hydrogen atom, a linear (C.sub.1 -C.sub.6)-alkyl radical, a branched (C.sub.1 -C.sub.6)-alkyl radical, a phenyl radical and a benzyl radical;X.sub.1, X.sub.2, X.sub.3, X.sub.4, X.sub.5, and X.sub.6 are independent from each other, and are selected from the group consisting of a hydrogen atom, a chlorine atom and a bromine atom; anda and b are independent of each other, and are integers of from 0 to 3;(b) from 80 to 20 percent by weight of a copolymerizable monomer having at least one ethylenic unsaturation in its molecule.