Use of new additives in a paint formulation containing particles of titanium dioxide, as agents enhancing the opacity of the dry film or ongoing drying

摘要

Use, in a acusosa paint formulation contains particles of titanium dioxide, as an agent improving the opacity of the dried or being dried film of a water-soluble copolymer consisting of: a) 4% to 25% weight of monomers of acrylic acid and / or methacrylic acid and / or any of its salts, b) 75% to 96% by weight of at least one monomer of formula (I): R - X - R '( I) according to which: R represents, especially acrylate, methacrylate, methacrylurethane, vinyl or allyl, R 'denotes hydrogen or an alkyl group having 1 to 4 carbon atoms, X represents a structure including n unit polymerizable unsaturated function (s) of ethylene oxide EO and m unit (s) of propylene oxide OP arranged randomly, m and n are two integers between 0 and 100, of which one at least is not zero, and are such that m + n is greater than 17, said copolymer has a molecular mass of between 200 000 and 50 000 000 g / mol.