Patent ID: 9096704
Filing Date: 2015-08-04
Classification: C08F,C08L

Abstract:
1. An impact modifier formed by graft polymerizing 55 to 70% by weight of a rubber polymer with 30 to 45% by weight of a methacrylate-based monomer, wherein said rubber polymer is prepared by polymerizing 100 parts by weight of a monomer mixture comprising 30 to 45% by weight of a diene-based monomer and 55 to 70% by weight of alkyl acrylate in the presence of 0.1 to 1 part by weight of an antioxidant using a cross-linking agent in an amount of 0.5 to 1 part by weight per 100 parts by weight of the monomer mixture, wherein said rubber polymer has a particle diameter of about 170 nm to about 230 nm, and wherein the impact modifier added to a methacrylate-based resin composition in an amount of 5 to 45% by weight provides a molded article having an Izod notched impact strength of about 4.5 to about 9 kgf·cm/cm at a thickness of ¼″ according to ASTM D256, a yellow index of about 1.7 or less according to ASTM D1925, a pencil hardness of 1H or more at a load of 500 g and a temperature of 23° C. according to JIS K5401, a total light transmittance of about 92% or more and a haze of about 0.9% or less respectively measured by a color computer manufactured by Suga Instrument Corporation.