Patent ID: 7868062
Filing Date: 2011-01-11
Classification: B29C,C08F,C08L,Y10S,Y10T

Abstract:
1. An extruded polymeric article having a frosted and textured surface appearance comprised of a polymeric matrix and from greater than 5 weight percent to 60 weight percent of polymeric particles, wherein said polymeric particles are substantially spherical, highly crosslinked, have a weight mean particle size of between 25 and 70 micrometers, wherein the article has a Haze number as determined by ASTM D1003 of at least 90%, a Total White Light Transmission of 56.4% or greater, as determined by a Hunterlab colorimeter D25 model using ASTM E1331 and ASTM E1164, an opacity as determined by ASTM D2805-80 of at least 10%, and a surface roughness of from 0.5 micrometers to 30 micrometers as measured using ASME methods B46.1.1, B46.1.12 and Y14.36, wherein said determinations are made using an 0.125 inch thick extruded sheet comprised of the polymeric matrix and polymeric particles, wherein said polymeric matrix and polymer particles have a mismatch of refractive indices in which the difference in refractive index between the polymeric matrix and polymer particles is greater than 0.02 and less than or equal to 0.077, and wherein said highly crosslinked spherical beads are comprised of 15-35 weight percent styrene; 65-84.9 weight percent alkyl methacrylate, alkyl acrylate, or a mixture thereof; and 0.1-2.5 percent by weight of one or more crosslinking agents, and wherein the polymeric matrix is selected from the group consisting of acrylonitrile/butadiene/styrene copolymer, acrylonitrile/styrene/acrylate copolymer, polyester, methyacrylate/butadiene/styrene copolymer, high impact polystyrene, acrylonitrile/acrylate copolymer, polystyrene, styrene/acrylonitrile copolymer, methylmethacrylate/styrene copolymer, acrylonitrile/methyl methacrylate copolymer, impact modified polyolefins, poly(vinyl chloride), impact modified poly(vinyl chloride), imidized acrylic polymer, acrylic polymer or impact modified acrylic polymer, and polymethyl methacrylate or copolymers of methyl methacrylate.