COPOLYMER SURFACTANTS Russian patent published in 2011 - IPC C09D5/02 C09D7/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to copolymer surfactants and use thereof in emulsion paints. The paint composition for colouring emulsion paints contains at least one pigment, water and a copolymer surfactant. The copolymer surfactant has average molecular weight between 400 and 200000 Da and contains the following monomers: (a) 10-80 wt % of at least one compound selected from α,β-ethylene unsaturated C₃-C₁₂ carboxylic acids or anhydride thereof, (b) 10-80 wt % of at least one α,β-ethylene unsaturated C₂-C₁₂ vinyl monomer and (c) 0.01-20 wt % of at least one surfactant. Each of the said monomers is either an acrylic or methacrylic ester with an ethoxylated fragment, having the following structure: H₂C=C(X)-C(O)O-E-R, where X denotes hydrogen or methyl, E denotes ethoxylate and R denotes alkyl phenyl, monostyrene phenyl, distyrene phenyl or tristyrene phenyl. When added to a water emulsion paint, the dye composition does not lead to change in viscosity for low Stormer shearing force in a water emulsion paint obtained from a mixture containing the said dye composition, by more than approximately ±10% of the viscosity for low Stormer shearing force of the acrylic base from which the paint was prepared. The dye composition also contains at least one oxygen-containing solvent, antifoaming agent, preservative and sodium hydroxide. Described also is a water emulsion paint which is prepared from a mixture of the base of the paint and the dye composition containing at least one pigment, water and the said copolymer surfactant. The paint also contains an associative thickener which is a non-ionic hydrophobically modified ethylene oxide urethane block copolymer, hydrophobically modified polyether, hydrophobically modified alkali-soluble emulsion, hydrophobically modified poly(meth)acrylic acid, hydrophobically modified hydroxyl ethyl cellulose, hydrophobically modified poly(acrylamide) or mixture thereof.

EFFECT: paint has good fluidity properties/levelling capacity, does not change colour after rubbing.

27 cl, 9 tbl, 15 ex, 1 dwg