FIELD: manufacturing of construction materials. SUBSTANCE: thermoplastic composition comprises grafted copolymer of styrene and block copolymer of styrene and conjugated diene and/or hydrogenated conjugated diene comprising up to 30 wt.% of styrene. Copolymer of styrene which contains 31-42 wt.% of polystyrene being grafted on polypropylene or statistic copolymer of propylene and ethylene or its mixture with said block copolymer and 6.67-15 wt. % of ethylene-propylene rubber or 7.5 wt.% of butyl rubber is used as said grafted copolymer of styrene. Said composition comprises, wt.%: grafted copolymer of styrene, 79-92.5; block copolymer, 7.5-25. EFFECT: improved impact resistance of desired thermoplastic composition. 3 cl, 3 tbl
