C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 51/08 (2006.01) C08F 8/14 (2006.01) C08F 8/44 (2006.01) C09D 151/08 (2006.01)
Patent
CA 2113753
AIR-DRYING AQUEOUS POLYMER DISPERSIONS ABSTRACT OF THE DISCLOSURE The invention relates to an air-drying aqueous polymer dispersion based on a core/shell polymer having an alkyd resin in the core and an addition polymer grafted thereon, with 50-90 weight percent of the core/shell polymer being composed of alkyd resin and 50-10 weight percent being composed of addition polymer, and with the alkyd resin - containing more than 40 and up to 80 weight percent of unsaturated fatty acid, at least 5 mole percent of which contains conjugated double bonds, - having an acid number of not more than 5 (mg KOH/g), and - having a number average molecular weight in the range of 400 to 5000, and with the addition polymer having an acid number in the range of 40 to 200 (mg KOH/g). The aqueous polymer dispersions according to the invention were found to be highly stable and to have a comparatively low viscosity, even at concentrations of 40 weight percent and above. It was found that topcoats obtained using dispersions with a high alkyd resin content are virtually identical in terms of properties with topcoats obtained in a traditional manner using alkyd paints based on organic solvents, while the gloss of topcoats obtained using the polymer dispersions according to the invention frequently is even higher.
Buter Roelof
Thijssen Ingrid G. C.
Akzo N.v.
Swabey Ogilvy Renault
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