BLOCK COPOLYMER AND POLYMER-MODIFIED ASPHALT BINDER COMPOSITION FOR USE IN ASPHALT COATING AS BASE COURSE Russian patent published in 2013 - IPC C08L95/00 C09D195/00 E01C7/00 C08F2/06 

FIELD: chemistry.

SUBSTANCE: asphalt binder composition contains 90-98 wt % asphalt component and 2-10 wt % block copolymer composition. The block copolymer composition contains (i) a copolymer which contains one block of monovinyl aromatic hydrocarbon and one conjugated diene block and (or) one or more block copolymers which contain at least two blocks of monovinyl aromatic hydrocarbon and at least one conjugated diene block. In another version, the asphalt binder composition contains a block copolymer composition which contains (i) a block copolymer obtained via a coupling reaction, which has a plurality of beams comprising at least two blocks of a monovinyl aromatic hydrocarbon located on at least two of the plurality of beams, and at least one conjugated diene block located on at least one of the plurality of beams, and (ii) one or more block copolymers comprising at least one block of a monovinyl aromatic hydrocarbon and at least one conjugated diene block. The ratio (i)/(ii) in the polymer compositions is greater than 1:1.

EFFECT: use of the polymer-modified mixture in the base course improved fatigue properties, high resistance to permanent deformation and cost-effectiveness.

17 cl, 2 tbl, 4 ex