Patent ID: 6861129
Filing Date: 2005-03-01
Classification: B32B,G02B,Y10T

Abstract:
1. A mar resistant transparent co-extruded sheet, comprised of: a cap layer containing particles having a mean particle size of about 1 to 60 microns wherein 90% of the particles are less than 70 microns, at a loading of 0.1 to 18%, melt blended with an acrylic matrix, wherein the particle and matrix have refractive indices within 0.020 units when measured in conformance with ASTM D 542; and a clear substrate layer comprised of an acrylic composition, wherein the substrate has a refractive index within 0.020 units of the refractive index of the cap layer matrix when measured in conformance with ASTM D 542; and wherein the co-extruded product has (i) a luminous transmission (CIE tristimulus Y value) of greater than 90% when measuring spectral transmission data using a spectrophotometer and the 2° standard observer, and calculating the CIE tristimulus Y value in conformance with ASTM E 308, and