POLYCARBOXYLATE PLASTICISING ADDITIVE FOR CONCRETE, BUILDING MORTARS AND DRY CONSTRUCTION MIXES AND METHOD OF ITS PRODUCTION (VERSIONS) Russian patent published in 2012 - IPC C04B24/26 

FIELD: construction.

SUBSTANCE: additive represents a comb-like copolymer with average molecular weight (15-50)×10³ units, containing the following: a) from 50 to 96.9 mol % of structural units of the general formula I: where R¹=H or CH₃; X=-OM_a, -NH-(C_mH_2mO)n-R²; Y=H, COX; M=H, uni- or bivalent cation of metal, ion of ammonium or organic amine; a=1 or 1/2; m=2-4;n=0-100; R²=H, CH₃, C₂H₅, C₃H₇, C₄H₉; b) from 3.0 to 42.0 mol. % of structural units of the general formula II where R³=H, CH₃, C₂H₅,C₃H₇, C₄H₉R⁴=H or CH₃; p=0-2; k=0 or 1; m-2-4; n=0-100; c) from 0.1 to 8.0 mol % of structural units of the general formula III: where A=H, COOM_a; M=H, uni- or bivalent cation of metal, ion of ammonium or organic amine; a=1 or 1/2; f=0 or 1; b=2-4;g=0-130; R⁵=H or CH₃; R⁶=H, C₁-C₁₀ alkyl; provided that if p=f=g=0 and A=H, then R³≠R⁶ or if f=g=0 and A=M, then R⁶≠M. The additive may be an aqueous solution with concentration of 20-60 wt %.

EFFECT: improved plasticising properties, production of materials with higher strength.

9 cl, 1 tbl, 11 ex