METHOD OF PREPARING BITUMEN BINDER COMPOSITION Russian patent published in 2010 - IPC C08L95/00 C08L25/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing a composition of polymer-modified bitumen binder essentially in the absence of cross-linking agents, according to which a bitumen component is heated in a mixing basin to 185-221°C, a block-copolymer composition is added to the bitumen component, while mixing the bitumen component until formation of a homogenous mixture of the block copolymer, and the homogenous mixture is continuously stirred while maintaining temperature of 185-221°C for 4-30 hours, thereby obtaining a cured composition of polymer-modified bitumen binder. The block copolymer composition used in the method contains a di-block copolymer containing one block of monovinylaromatic hydrocarbon and one block diene with conjugated double bonds having maximum molecular weight of 30000-78000 and vinyl content of 35-80 mol % based on the number of repeating monomer links in the diene block with conjugated double bonds, and one or possibly more block-copolymers containing at least two blocks of a monovinylaromatic hydrocarbon and at least one block of a diene with conjugated double bonds, a block copolymer selected from linear tri-block copolymers, having maximum molecular weight which is 1.5-3.0 times greater than maximum molecular weight of the di-block copolymer, multi-beam block copolymers having maximum molecular weight which is 1.5-9.0 times greater than maximum molecular weight of the di-block copolymer, and their mixtures, where each block copolymer contains 35-80 mol % vinyl, based on the number of repeating monomer links in the diene block with conjugated double bonds, and where, when both components (1) and (2) are present in the block copolymer composition, the ratio of (1) to (2) is greater than 1:1. The invention also relates to an alternative version of the method, a bitumen binder composition and a block copolymer composition.

EFFECT: improved technological characteristics of compositions.

25 cl, 8 tbl, 15 ex