Patent ID: 7445840
Filing Date: 2008-11-04
Classification: B29C,B32B,Y10T

Abstract:
1. A weather-resistant synthetic wood comprising a foamed core body material and a weather-resistant outer layer material covering a surface of and integrally bonded by coextrusion molding to said foamed core body material, wherein said weather-resistant outer layer material is unfoamed or foamed at an expansion rate lower than that of said foamed core body material, wherein said foamed core body material is a mixture comprising: 100 wt. % of a primary component comprising either a polystyrene resin and an optional high-impact polystyrene resin, or a polypropylene resin; and 5-50 wt. % of a secondary component comprising one or more of an acrylonitrile-butadiene-styrene copolymer, an acrylonitrile-acrylic-styrene copolymer, and an acrylonitrile-ethylene-propylene-styrene copolymer, based on 100 wt. % of said primary component of said foamed core body material, wherein said weather-resistant outer layer material is a mixture comprising: 100 wt. % of a primary component comprising one or both of an acrylonitrile-acrylic-styrene copolymer, and an acrylonitrile-ethylene-propylene-styrene copolymer; and 5-80 wt. % of a secondary component comprising one or more of a polystyrene resin, a high-impact polystyrene resin, and a polypropylene resin, based on 100 wt. % of said primary component of said weather-resistant outer layer material, and wherein said primary component of said foamed core body material comprises a mixture of a polystyrene resin and a high-impact polystyrene resin, and said secondary component of said weather-resistant outer layer material comprises a mixture of a polystyrene resin and a high-impact polystyrene resin, or wherein said primary component of said foamed core body material comprises a polypropylene resin, and said secondary component of said weather-resistant outer layer material comprises a polypropylene resin.