Patent ID: 7980734

Claim:
A bulk light diffuser material comprising from 80 percent by weight to 99.9 percent by weight of a rigid, substantially fully hydrogenated block copolymer and from 0.1 percent by weight to 20 percent by weight of light diffusing particles that have a refractive index that differs from that of the hydrogenated block copolymer matrix by greater than or equal to 0.02, each weight percentage being based upon total weight of hydrogenated block copolymer and light diffusing particles, the block copolymer constituting a continuous polymer phase and the light diffusing particles constituting a disperse phase within the continuous polymer phase, the block copolymer comprising at least two distinct blocks of hydrogenated vinyl aromatic polymer, and at least one block of hydrogenated conjugated diene polymer, whereby a two millimeter thick sheet comprising the bulk light diffuser material has a percent total transmittance of at least 50% and a percent haze (ASTM D-1003) of at least 70%.