NOVEL COMPOSITIONS OF NON-HYDROGENATED BLOCK COPOLYMERS Russian patent published in 2012 - IPC C08L53/02 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer chemistry, particularly to novel block copolymer compositions and methods of preparing said compositions. The novel block copolymer compositions are particularly suitable for making articles by moulding or extrusion. The block copolymer composition contains 100 pts.wt solid block copolymer obtained via anionic polymerisation and 5-250 pts.wt plasticising modifier. The block copolymer contains at least two blocks A and at least one block B. Block A is a monoalkenylarene block, block B is selected from polymer blocks containing at least one conjugated diene and at least one monoalkenylarene and having random or controlled distribution. The plasticising modifier contains a conjugated diene and has a structure similar to the structure of block B of said block copolymer. The plasticising modifier is synthesised and/or treated together with the block copolymer in situ to obtain a homogeneous mixture of modifier and block copolymer.

EFFECT: jointly prepared mixtures of modifying plasticisers and block copolymers are characterised by higher breaking and tearing strength compared to similar mixtures containing oil, as well as higher plasticity without considerable deterioration of processability.

17 cl, 1 dwg, 7 tbl, 7 ex