BLOCK COPOLYMER FOR POLYMER-BITUMEN BINDERS, POLYMER-BITUMEN COMPOSITIONS FOR ROAD CONSTRUCTION Russian patent published in 2024 - IPC C08F297/04 C08L95/00 C04B26/26 

FIELD: construction materials.

SUBSTANCE: invention relates to block copolymers for polymer-bitumen binders. Disclosed is a bimodal butadiene-styrene block copolymer for polymer-bitumen binders, which is a linear three-block copolymer of formula A-B-A, where A is a polystyrene block, B is a polybutadiene block, characterized by a conical distribution of 1,2-links in the polybutadiene block, wherein the highest content of 1,2-units is concentrated at the end of the polybutadiene block adjacent to the first polystyrene block, and ratio of content of 1,2-links to 1,4-links during formation of butadiene block varies from 4.6–4.3 at conversion of butadiene of 0–10% to 2.0–3.5 at conversion of butadiene of 90–100%; two versions of a polymer-bitumen composition for road construction, containing the disclosed bimodal butadiene-styrene block copolymer, and an asphalt mixture containing the disclosed polymer-bitumen compositions.

EFFECT: improved properties of the butadiene-styrene block copolymer, high Shore hardness and Vicat softening temperature, as well as high processability of polymer-bitumen binders.

8 cl, 3 tbl, 10 ex