Use in a paint of a dry-ground, calcium carbonate with a copolymer of methacrylic acid with an alkoxy or hydroxyl polyalkyleneglycol group

摘要

This invention consists in the use, in a paint, of a calcium carbonate characterised in that the carbonate is dry-ground in the presence of a grinding aid agent, firsdy, and in that the grinding aid agent is, secondly, a copolymer, consisting:1) of at least one anionic monomer chosen from among acrylic acid, methacrylic acid and their blends;2) and of at least one non-ionic monomer, of formula:m, n, p and q are integers such that: m, n, p < 150, q > 1, and 5 S (m+n+p)q < 150, and preferentially 15 < (m+n+p)q < 120;Rl represents hydrogen or methyl or ethyl group;R2 represents hydrogen or methyl or ethyl group;R represents a group containing an unsaturated polymerisable function, preferentially belonging to the group of vinylics, or to the group of acrylic, methacrylic, maleic esters, or to unsaturated urethanes such as acrylurethane, methacrylurethane, α,α'-dimethyl isopropenyl benzyl urethane, allylurethane, or to the group of allylic or vinylic ethers, whether or not substituted, or to the group of ethylene unsaturated amides or imides, or the group constituted by acrylamide and methacrylamide;R' represents hydrogen or a hydro-carbonated group with 1 to 40 carbon atoms, preferentially 1 to 4 carbon atoms, where R' is most preferentially the methyl group.