BITUMEN COMPOSITION, METHOD FOR PROLONGING LIFETIME THEREOF, AND BLOCK COPOLYMER COMPOSITION Russian patent published in 2002 - IPC

FIELD: manufacture of building and road-building materials. SUBSTANCE: composition contains bitumen component, at least one block copolymer (I), in which at least one block is formed by conjugated diene and at least two blocks are formed by monovinylaromatic hydrocarbon, and 25 wt.% or less of diblock copolymer (II), the latter having apparent molecular weight within a range of 100000-170000. Content of vinyl moiety in block copolymer composition is at least 25 wt.% of the total diene content. Block copolymer compositions are used as plasticizers. EFFECT: improved low- and high-temperature characteristics and increased lifetime. 9 cl, 5 tbl