Aqueous binders for coatings with improved gloss

Details Aqueous binders for coatings with improved gloss Aqueous binders for coatings with improved gloss

C - Chemistry, Metallurgy

09

D

C09D 133/00 (2006.01)

Patent

CA 2643936

A water-reducible mixture of (meth)acrylic copolymers having a hydroxyl number of from 40 mg/g to 250 mg/g, an acid number of from 15 mg/g to 80 mg/g, a weight average molar mass Mw from 9 kg/mol to 40 kg/mol and a glass transition temperature Tg from -40 °C to 80 °C, based on polymerised monomers comprising at least one alkyl ester A of an olefinically unsaturated carboxylic acid having from 1 to 8 carbon atoms in the alkyl group, at least one hydroxy functional alkyl ester B of an olefinically unsaturated carboxylic acid, at least one aliphatic compound C that has both hydroxy and carboxyl functionalities, or which is a lactone or a cyclic lactone, at least one vinyl monomer D which does not comprise a moiety derived from an olefinically unsaturated carboxylic acid, at least one olefinically unsaturated carboxylic acid E, a process for its preparation, and a method of use thereof in the preparation of paints.

La présente invention concerne un mélange pouvant être réduit dans l'eau de copolymères acryliques ou méthacryliques d'indice hydroxyle compris entre 40 mg/g et 250 mg/g, d'indice acide compris entre 15 mg/g et 80 mg/g, de masse moléculaire moyenne en poids Mw comprise entre 9 kg/mol et 40 kg/mol et de température de transition vitreuse Tg comprise entre -40 °C et 80 °C, en se basant sur les monomères polymérisés comprenant au moins un ester alkylique A d'un acide carboxylique à insaturations oléfiniques présentant entre 1 et 8 atomes de carbone au sein du groupement alkyle, au moins un ester alkylique B portant une fonction hydroxy d'un acide carboxylique à insaturations oléfiniques, au moins un composé aliphatique C portant des fonctionnalités hydroxy et carboxy, ou qui est une lactone ou une lactone cyclique, au moins un monomère vinylique D qui ne contient pas de fonctions dérivées d'un acide carboxylique à insaturations oléfiniques, au moins un acide carboxylique à insaturations oléfiniques E. L'invention concerne également son procédé d'élaboration et une méthode d'utilisation dans l'élaboration de peintures.

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