Dulux Australia Ltd.

Other

Bruce C Henshaw

Frederick J Lubbock

Raymond H Gunning

Perry J Cooke

Robert M Boyack

Aqueous acrylic polymer emulsions containing as a first polymeric component a core-shell polymer having a core formed from one or more monomers selected from styrene, vinyl acetate, vinyl toluene and acrylic or methacrylic acid esters of alcohols of 1 to 4 carbon atoms and a shell formed of the above monomers in conjunction with one or more monomers selected from acrylic acid or methacrylic acid esters of alcohols of 1 to 8 carbon atoms and a minor amount of acrylic or methacrylic acid and as a second polymeric component a polymer composed of a major amount of one or more monomers selected from styrene, vinyl acetate, vinyl toluene and acrylic or methacrylic acid esters of alcohols of 1 to 4 carbon atoms and a minor portion of one or more acrylic acid esters of alcohols of 1 to 8 carbon atoms with acrylic and/or methacrylic acid.

Acrylic polymer emulsion

Aqueous slurries of vesiculated cross-linked polyester resin granules which show a shrinkage of less than 5% on drying are prepared by a double-emulsion process in the presence of polyamine having a pKa value of 8.5-10.5 at a concentration of 0.3 to 1.4 amine groups per carboxyl group of the polyester, the acid value of which is limited to 10-45 mgm KOH per gm. The granules are of particular use as opacifying matting agents in latex paints and avoid the defect observed hitherto of cracking at high film builds.

Polyester granules and process

A process for preparing a film-forming material by reacting at least two .alpha., .beta.-ethylenically unsaturated monomers one of which is acrylonitrile with a drying or semi-drying oil-modified alkyd resin comprising 1% - 4% itaconic acid and then cooling the reaction mixture rapidly such that a dispersion of polymer particles of maximum diameter 2 micron is formed. The film-forming materials thus prepared are useful as constituents of fast-drying automotive refinish enamels.

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Mount Waverley, Australia

Bruce C Henshaw