Aqueous binder dispersion useful for producing hardly yellowing, highly glossy coatings
AssigneeBASF Coatings GmbH
InventorsGuido Wilke, Dittmar Grapatin, Heinz-Peter Rink
Life of this patent
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Abstract
The invention relates to binders BM for one-component coating systems, comprising a polyurethane alkyd resin component (A) composed of: (a) from 5 to 50% by weight of a mixture of: (a1) from 90 to 30 parts by weight of an unsaturated C6 to C30 fatty acid containing at least two nonconjugated double bonds, and (a2) from 10 to 70 parts by weight of an is unsaturated C6 to C30 fatty acid containing at least two conjugated double bonds as esterified polymer side chains of the polyurethane alkyd resin component (A) and (b) from 95 to 50% by weight of polyurethane units as polymer main chains of the polyurethane alkyd resin component (A).
Claims15
An aqueous dispersion for one-component coating systems, the aqueous dispersion comprising a binder which comprises a polyurethane alkyd resin component (A), component (A) consisting essentially of:
- (a) from 5 to 50% by weight of a mixture of:
- (a1) from 90 to 30 parts by weight of an unsaturated C6 to C30 fatty acid containing at least two nonconjugated double bonds, and
- (a2) from 10 to 70 parts by weight of an unsaturated C6 to C30 fatty acid containing at least two conjugated double bonds
- as esterified polymer side chains of the polyurethane alkyd resin component (A), and
- (b) from 95 to 50% by weight of polyurethane units as polymer main chains of the polyurethane alkyd resin component (A).
A method of coating a substrate, comprising:
- providing a substrate;
- coating the substrate with a one-component coating system to produce a coated substrate, the one-component coating system comprising a binder which comprises a polyurethane alkyd resin component (A), component (A) consisting essentially of:
- (a) from 5 to 50% by weight of a mixture of:
- (a1) from 90 to 30 parts by weight of an unsaturated C6 to C30 fatty acid containing at least two nonconjugated double bonds, and
- (a2) from 10 to 70 parts by weight of an unsaturated C6 to C30 fatty acid containing at least two conjugated double bonds
- as esterified polymer side chains of the polyurethane alkyd resin component (A), and
- (b) from 95 to 50% by weight of polyurethane units as polymer main chains of the polyurethane alkyd resin component (A), and
- curing the coated substrate at a temperature of between 10 to 60° C.
Dependencies are inferred from the claim text.