Production manner null of extrusion molding converted timber charge and formation

摘要

PURPOSE:To prepare a molded article with an improved resistance to heat and chemicals by extruding a specific styrene polymer and cooling the extrudate with air. CONSTITUTION:100 pts.wt. styrene polymer (e.g. polystyrene) having mainly a syndiotactic structure and a melt viscosity (measured at 300 deg.C, shear rate of 10/sec) of 103-106P, 3-200 pts.wt. thermoplastic resin (e.g. polyester), 10-150 pts.wt. inorg. filler (e.g. TiO2), 1-100 pts.wt. rubber or compatibilizer (e.g. styrene- butadiene copolymer rubber), 0.0001-2 pts.wt. antioxidant [e.g. tris(2,4-di-t- butylphenyl) phosphite], etc., are compounded. The resulting compsn. is extruded at 100-260 deg.C, cooled in air with a flow rate of 5m/sec or lower at -20 to 240 deg.C to give an extrusion molding material having a crystallinity of styrene polymer parts of 15% or higher. The material is extruded under a shear stress of 5X106dyne/cm2 or lower to give a molded article.