METHOD FOR PRODUCTION OF HIGH-IMPACT POLYSTYRENE Russian patent published in 1996 - IPC

FIELD: instrumentation engineering. SUBSTANCE: method for production of high-impact polystyrene includes preparation of elastomer solution in styrene, thermal polymerization and suspension polymerization. In the course of polymerization relation K= x 0.000138, K is within 2.5-18.5, where η is prepolymer viscosity, cP; X is compression degree of prepolymer, mas. %; R is concentration mas.%; C_c is concentration of indicator at prepolymerization stage, mas.%; C_if is concentration of initiator at suspension stage, mas.%; C_is=0.07 when benzoyl peroxide is used, and I_f= 0.15 when lauryl peroxide or peroxide of fraction of fat acids is used. EFFECT: attained balance of mechanical and physical properties and increased fluidity of product melt without impairing sanitary characteristics. 1 tbl