BITUMEN COMPOSITION, METHOD FOR PROLONGING SERVICE TIME OF BITUMEN COMPOSITION, AND PAVEMENT Russian patent published in 2002 - IPC

FIELD: manufacture of road-building materials. SUBSTANCE: invention provides bitumen composition containing bitumen component and block- copolymer composition. The latter contains at least one of groups consisting of linear triblock-copolymers, branched (multibeam) block-copolymers, and diblock- copolymer, said block-copolymers containing at least one monovinylaromatic hydrocarbon block (A) and at least one conjugated diene block (B). Block- copolymer composition is present in proportion of 1-8% of the total weight of bitumen composition and contains vinyl in proportion of 35-65 wt. % of the total content of diene. Any of diblock-copolymers (AB) present has apparent molecular weight between 60000 and 100000. Any of triblock-copolymers prepared by way of complete consecutive preparation has apparent molecular weight between 120000 and 200000. EFFECT: improved properties of pavements at low and high temperatures. 8 cl, 4 tbl