Pigment dispersant, method of making coating compositions,...

C - Chemistry – Metallurgy – 09 – D

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C09D 201/00 (2006.01)

Patent

CA 2552469

A coating composition comprises at least one pigment dispersed in an acrylic polymer, wherein the acrylic polymer is prepared by first polymerizing a mixture of ethylenically unsaturated monomers comprising: (a) at least about 15% by weight unsaturated meta-isopropenyl-.alpha.,.alpha.- dimethylbenzyl isocyanate; (b) at least one further aromatic polymerizable monomer, in an amount so that monomers (a) and (b) combined are at least about 50 percent by weight of the mixture of ethylenically unsaturated monomers; and (c) at least one alkyl (meth)acrylate to form a polymer, and secondly, reacting the isocyanate groups of the polymer with a (d) a hydroxyalkyl acid in which the hydroxy and acid groups are separated by at least four atoms or with a diol having both a primary hydroxyl group and a secondary hydroxyl group and then with a cyclic anhydride and, optionally, with one or more members selected from the group consisting of (e) hydroxyethylene ethyl urea, (f) methoxypolyethylene glycols, and (g) other, different materials having a functional group reactive with isocyanate.

La composition de revêtement selon la présente invention comprend au moins un pigment dispersé dans un polymère acrylique, le polymère acrylique étant préparé en polymérisant tout d'abord un mélange de monomères éthyléniquement insaturés comprenant : (a) au moins environ 15 % en poids d'isocyanate de méta-isopropényl-a,a-diméthylbenzyle insaturé ; (b) au moins un autre monomère aromatique polymérisable, en une quantité telle que les monomères (a) et (b) combinés représentent au moins environ 50 pour cent en poids du mélange des monomères éthyléniquement insaturés ; et (c) au moins un (méth) acrylate d'alkyle pour former un polymère, et deuxièmement, en faisant réagir les groupes isocyanate du polymère avec (d) un acide hydroxyalkyle dans lequel les groupes hydroxyle et acide sont séparés par au moins quatre atomes ou avec un diol ayant à la fois un groupe hydroxyle primaire et un groupe hydroxyle secondaire et ensuite avec un anhydride cyclique.

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