Patent ID: 8119231

Claim:
A monolithic sheet wherein the sheet is a transparent acrylic sheet having a thickness of from 0.75 to 2.00 inches, having a composition consisting of: a) from 75 to 95 weight of an acrylic copolymer having from 75 to 95 percent by weight of methylmethacrylate monomer units, from 5 to 25 percent by weight of one or more C 2-18 alkyl (meth)acrylate monomer units, and from 0 to 5 percent of other ethylenically unsaturated monomer units, wherein the total monomer units add up to 100 percent; and b) from 5 to 25 percent by weight of one or more core-shell impact modifiers having an average particle size of 150 nm or less, and wherein a monolithic polymer sheet of said composition, having a thickness of 1.2 inches or less, passes the UL Standard 752 Level I test, and wherein the polymer sheet is transparent with a TWLT of higher than 50% and haze of less than 30% measured by ASTM-D1003 and ASTM E313.