FIELD: cosmetics, chemical technology.
SUBSTANCE: invention relates to polymers with the branched block-polymer structure that are used for treatment of keratin-containing substrates, mainly, in cosmetic compositions, such hair lacquers, hair conditions, lotions for fixing hair stacking, creams and so on that comprise polymers. Block-copolymer for keratin-containing substrates is prepared by polymerization of polyfunctional monomer or monomers comprising at least two functional groups and wherein the reaction ability of one functional group is higher as compared with another functional group, the first unsaturated monomer or monomers based on ethylene and comprising from 2 to 30 carbon atoms that are polymerized preferably with functional group of a bifunctional monomer possessing the higher reaction ability to form A block, and the second unsaturated monomer or monomer based on ethylene and comprising at least one carboxyl group that are polymerized with functional group of a bifunctional monomer possessing the less reaction ability to form B block. Block A shows higher hydrophobic properties as compared block B and copolymer is characterized by at least two different vitrification temperature points. Using the proposed block-copolymer allows optimizing the required properties of compositions for hair stacking, such as light spreading on hair, prevention of hair wave falling, retention of stacking under conditions of high moisture, stickiness, rigidity, resistance against deposition for layers, capacity for stacking recovery, increase of hair volume and washing out from hair. Copolymer can be used for its incorporation in compositions for hair stacking with the low content of VOC based on an aqueous-alcoholic base that satisfy requirements by limitation of the VOC content.
EFFECT: improved preparing method, improved and valuable properties of polymer.
68 cl, 7 dwg, 11 tbl, 12 ex
