Patent ID: 6316570
Filing Date: 2001-11-13
Classification: C08F,G02B

Abstract:
A polymerizable composition comprising:(a) a major amount of a first allyl functional monomer represented by the following general formula,R.sub.1 --[--O--C(O)--O--R.sub.2 ].sub.iin which R.sub.1 is a polyvalent residue of an aliphatic polyol, R.sub.2 is an allyl group or a substituted allyl group, and i is a whole number from 2 to 6; and(b) a minor amount of a second allyl functional monomer represented by the following general formula,R.sub.3 --[--O--C(O)--O--R.sub.4 ].sub.kin which R.sub.3 is a polyvalent residue of an aromatic polyol, R.sub.4 is a an allyl group or a substituted allyl group, and k is a whole number from 2 to 6,wherein said second allyl functional monomer is present in said polymerizable composition in at least an amount to provide a polymerizate of said polymerizable composition having (i) reduced cracking defects relative to a polymerizate of said composition free of (b), and (ii) a refractive index of less than 1.530.