Patent ID: 7514523

Claim:
A composition comprising: (i) a polycarbonate with a refractive index α; and, (ii) crosslinked polymer particles with a refractive index β; wherein β is within the range of about 0.98α to about 1.02α; wherein the polymer particles with a refractive index β consist of a copolymer of at least one mono-vinyl aromatic monomer and at least one multiple-vinyl aromatic monomer, wherein the mono-vinyl aromatic monomer is selected from the group consisting of (i) styrene, (ii) ethylvinylbenzene, (iii) α-methyl-styrene, (iv) 1-vinyl naphthalene, (v) 2-vinyl naphthalene, (vi) vinyl toluene, (vii) methoxystyrene, (viii) t-butoxystyrene; (ix) alkyl, cycloalkyl, aryl, alkaryl, and aralkyl derivatives of (i)-(viii), in which the total number of carbon atoms in the monomer is not greater than 18; and (x) mixtures of two or more of (i)-(x); and wherein the multiple-vinyl aromatic monomer comprises a compound having a general formula as shown below: in which p is an integer from 2 to 6.