PRODUCTION OF THERMOPLASTIC RESIN COMPOSITION HAVING IMPROVED HEAT RESISTANCE

• Main Authors: KUSHIDA YUICHIRO, KAWANAMI MITSUNORI, YAMADA NAOYUKI
• Format: Patent
• Language: English
• Published: 14.02.1987
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To obtain the titled composition having improved heat resistance, flame retardance and impact resistance, by using a copolymeer consisting of alpha-methylstyrene, etc., a specific graft copolymer, etc., and extruding the composition by a specific single screw extruder having a specific kneading zone. CONSTITUTION:(A) 10-70wt% copolymer consisting of A1: (styrene-containing)alpha- methylstyrene, A2: vinyl cyanide and a maleimide (derivative) shown by the formula (R is H, etc.,) is blended with (B) 10-50wt% graft copolymer obtained by subjecting a monomer mixture consisting of an aromatic vinyl monomer, A2 and A3 to graft copolymerization in the presence of a butadiene (co)polymer, (C) 0-50wt% copolymer consisting of an aromatic vinyl monomer, A2 and a methacrylic ester copolymerizable with them and (D) 20-80wt% polyvinyl chloride resin by the use of a specific single screw extruder having a kneading zone consisting of a screw with a (pseudo)polygonal section in a position corresponding to a cylinder with a (pseudo)polygonal section at part between a feed opening and a vent opening.