Patent ID: 6627718
Filing Date: 2003-09-30
Classification: C08F,G02B

Abstract:
A composition comprising polymerizable monomers, comprising:(a) at least one polythio(meth)acrylate monomer; (b) at least one monomer with a high Abbe number comprising at least 2 polymerizable groups which are bridged cyclic units comprising an intracyclic ethylenic double bond or a linear or branched aliphatic residue comprising an ethylenicunsaturation directly bonded to a carbon of the ring; and (c) at least one polythiol monomer; and optionally, (d) at least one other monomer which is copolymerizable with the monomers (a), (b) and (c); wherein the composition is devoid of any monomer comprising one or more vinyl functional groups, other than (meth)acrylic and thio(meth)acrylic functional groups, which is different from the monomer (b).