FIELD: polymer production.
SUBSTANCE: object of invention are particle of foaming polystyrene showing improved foaming ability and strength. Process of invention comprises: (i) polymerization of mixture containing polystyrene granules, styrene monomer, cross-linking agent, foaming substance, poly(oxyethylenesorbitol monolaurate) added when degree of polymerization reaches 70-90% in amount 0.05 to 0.15 wt parts per 100 wt parts monomers, and polyethylene wax synthesized from formaldehyde in amount 0.05 to 0.2 wt parts per 100 wt parts monomers; and (ii) coating the mixture with containing substance. Described is also foaming polystyrene resin composition containing wax Sasol.
EFFECT: improved foaming ability and moldability, and increased strength.
8 cl, 1 tbl, 8 ex
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SU1462759A1 |
