Patent ID: 6677420
Filing Date: 2004-01-13
Classification: C08F,G02B,Y10S

Abstract:
A composition of polymerizable monomers comprising:âˆ’40 to 95 parts by weight of one or more monomers (I) of formula: â€ƒin which R1 and R2 are, independently, H or CH3, A is a divalent radical of formula: wherein m1 and m2 are each integers from 2 to 6;âˆ’5 to 50 parts by weight of a monomer (II) comprising at least one urethane unit and at least two (meth)acrylate functions; and between 0 to 30% by weight, compared to the total of monomers (I) and (II) of one or more monomers (III), which are different from monomers (I) and (II) and polymerizable by free radical mechanisms and wherein the monomers (III) are such that they would result in a homopolymer with refractive index less than or equal to 1.54, if homopolymerized.