Patent ID: 6309585
Filing Date: 2001-10-30
Classification: C08F,G02B

Abstract:
A high refractive index composition consisting essentially of:a core resin mixture comprising(i) a first compound having the formula (I): ##STR11##wherein n is from 0-30, R.sub.1 -R.sub.4 independently represent H or C.sub.1 -C.sub.6 alkyl, X is O, S, SO.sub.2, CO.sub.2, CH.sub.2, CH.dbd.CH, C(CH.sub.3).sub.2 or a single bond, and y.sub.1 -y.sub.8 independently represent H, OH, halogen, mercaptan or C.sub.1 -C.sub.4 alkyl,(ii) a second compound having the formula (II): ##STR12##wherein m is from 1-30, R.sub.1 -R.sub.4 independently represent H or C.sub.1 -C.sub.6 alkyl, X is O, S, SO.sub.2, CO.sub.2, CH.sub.2, CH.dbd.CH, C(CH.sub.3).sub.2 or a single bond, and y.sub.1 -y.sub.8 independently represent H, OH, halogen, mercaptan or C.sub.1 -C.sub.4 alkyl, and(iii) a reactive diluent comprising 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobomyl (meth)acrylate vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene or a mixture thereof, the mixture having greater than 70 parts by weight of the composition of the combined components (i) and (ii), and less than 30 parts by weight of the composition of component(iii), based on the total parts by weight of the core resin equaling 100, and n is less than m so as provide a refractive index of greater than 1.53 and a high impact resistance after curing the composition.