High-impact polystyrene. II. Physical properties and elastomer content in the latex-suspension method

The latex-suspension technique is used to prepare a family of rubber-modified polystyrene resins possessing high-impact resistance (Izod ca. 1.5 ft-lb/in.), high gloss, high heat distortion temperature, and high tensile properties. Data are presented on the preparation of medium- and low-impact grades by physical blending with crystal polystyrene and on the preparation of ultrahigh-impact polystyrene (Izod ca. 3.5 to 6) through the incorporation of high concentrations of rubber made feasible by the latexsuspension process.