ROAD SURFACE BINDER (POLYMER-TAR BINDER) Russian patent published in 2010 - IPC C08L95/00 

FIELD: chemistry.

SUBSTANCE: invention relates to materials used in constructing and repairing automobile roads, and specifically to road surface binding materials. The invention pertains to a road surface binder which contains a block-copolymer of alkadiene and styrene and industrial oil, as well as tar or a tar mixture with VU₅ ⁸⁰=60-160 s, with the following ratio of components, in wt %: tar or tar mixture with VU₅ ⁸⁰=60-160 s 83.0-91.3; industrial oil 5.0-12.0; block-copolymer of alkadiene and styrene 3.5-5.0.

EFFECT: road surface composition meets all quality requirements for binding materials on GOST R 52056-2003 for polymer-bitumen binder PBV 40, PBV 60, PBV 90 and PBV 130, and bitumen is replaced with tar which is cheaper and readily available (due to exclusion of the step for oxidising tar to produce bitumen).

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