COPOLYMER MIXTURE-CONTAINING DISPERSANT Russian patent published in 2014 - IPC C08L29/10 C08L33/02 C08L35/08 C04B24/26 

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer composition and a method for preparation thereof, a dispersant and a method for preparation thereof, as well as to use of the polymer composition. The polymer composition contains 3-90 wt % copolymer H and 3-90 wt % copolymer K. Each of the copolymers H and K contains structural links of a polyether macromonomer and structural links of an acid monomer in molar ratio of 1:20-1:1. At least 20 mol % of all structural links of copolymer H and at least 25 mol % of all structural links of copolymer K, in each case, are present in form of structural links of the acid monomer. At least 60 mol % structural links of the polyether macromonomer of copolymer H are represented by a structural link of an α derivative of isoprenol polyether of general formula (Ia) , where A are identical or different and denote an alkylene group in accordance with C_xH_2x, where x=2, 3, 4 or 5, and a are identical or different and denote an integer from 4 to 300. At least 60 mol % of structural links of the polyether macromonomer of copolymer K are represented by a structural link of a β derivative of a vinyloxy polyether of general formula (Ib) , where R^A are identical or different and denote a hydrogen atom, a linear or branched C₁-C₁₂alkyl group, C₅-C₈cycloalkyl group, phenyl group or C₇-C₁₂arylalkyl group, A are identical or different and denote an alkylene group in accordance with C_xH_2x, where x=2, 3, 4 or 5, b are identical or different and denote an integer from 6 to 450. The arithmetic average of alkylene groups A of structural links belonging to the structural link of the β derivative of vinyloxy polyether is at least 1.5 times greater than the arithmetic average of alkylene groups A of structural links belonging to the structural link of the α derivative of isoprenol polyether. The dispersant contains at least 30 wt % water and at least 10 wt % said polymer composition. The method of preparing the polymer composition and the dispersant involves preparing each of the copolymers H and K separately from each other in an aqueous solution and then mixing the separately prepared copolymers or separately prepared aqueous solutions. The polymer composition is used as a dispersant for hydraulic binding agents and/or for binding agents with latent hydraulic properties.

EFFECT: invention enables to produce a highly effective super-plasticising additive.

54 cl, 3 ex