Aqueous amino resin dispersions and thermosetting water-based paint compositions
AssigneeKansai Paint Co., Ltd.
InventorsAtsuya Kato, Yoshiyuki Yukawa, Hiroki Nagao
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Abstract
An aqueous amino resin dispersion excelling in storage stability and mechanical stability which is formed by dispersing hydrophobic amino resin in aqueous medium, using a polyester resin having specific hydroxyl value, acid value and number-average molecular weight as a dispersion stabilizer, said polyester resin being prepared by reacting polyhydric alcohol, polycarboxylic acid and/or polycarboxylic anhydride and monoepoxide compound having a long chain hydrocarbon group; thermosetting, water-based paint compositions comprising the aqueous amino resin dispersion; and multi-layered coating film-forming methods using the water-based paint compositions are provided.
Claims22
An aqueous amino resin dispersion characterized by comprising
- a polyester resin (a) having a hydroxyl value within a range of 10-200 mgKOH/g, an acid value within a range of 10-150 mgKOH/g and a number-average molecular weight of 1,000-10,000 and being prepared through reaction of polyhydric alcohol (a-1), polycarboxylic acid and/or polycarboxylic anhydride (a-2), and monoepoxide compound having a long chain hydrocarbon group (a-3), and
- hydrophobic amino resin (b),
- the weight ratio between the solid components of the polyester resin (a)/amino resin (b) being within a range of 5/95-49/51.
Dependencies are inferred from the claim text.