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US 2003/0119977 A1Published application
Aqueous coating agents for baking enamels with a high solid content and the use thereof
OwnerChristian Wamprecht, Beate Baumbach +2inventors
InventorsChristian Wamprecht, Beate Baumbach, Heino Muller, Joachim Petzoldt
Life of this patent
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Abstract
The invention relates to novel aqueous coating agents for baking enamels and to the use thereof, in particular for producing hard, elastic fillers with a high solid content for coating metallic surfaces, preferably car bodies.
Claims10
Binder mixture for aqueous stoving lacquers, comprising:
- I) specific binders dispersed in water,
- II) optionally water-soluble or -dispersible polyhydroxy compounds,
- III) water-soluble or -dispersible blocked polyisocyanates and/or amino resins and
- IV) optionally further water-soluble or -dispersible substances,
- characterized in that component I) comprises:
- A) a polyol component based on polyacrylate polyols and/or polyester-polyacrylate polyols with a hydroxyl group content of 1.0 to 8.0 wt. %, a carboxyl group content of 0 to 3.0 wt. %, a weight-average molecular weight of 2,000 to 50,000 and a glass transition temperature of ≧10° C.,
- B) optionally further polyfunctional polyols,
- C) optionally further crosslinking substances,
- D) optionally external emulsifiers and
- E) optionally conventional additives,
- with the proviso that component I) has been prepared either by a direct dispersing process or by the phase inversion process by means of a dispersing device with a high dispersing output per unit volume and has an average particle size of the dispersed particles of 0.05 to 10 μm particle diameter.
8 more elements
Aqueous stoving lacquer, the binder of which comprises a combination of
- I) specific binders dispersed in water,
- II) optionally water-soluble or -dispersible polyhydroxy compounds,
- III) water-soluble or -dispersible blocked polyisocyanates and/or amino resins and
- IV) optionally further water-soluble or -dispersible substances,
- characterized in that component I) substantially comprises:
- A) a polyol component based on polyacrylate polyols and/or polyester-polyacrylate polyols with a hydroxyl group content of 1.0 to 8.0 wt. %, a carboxyl group content of 0 to 3.0 wt. %, a weight-average molecular weight of 2,000 to 50,000 and a glass transition temperature of ≧10° C.,
- B) optionally further polyfunctional polyols,
- C) optionally further crosslinking substances,
- D) optionally external emulsifiers and
- E) optionally conventional additives, such as e.g. neutralizing agents, catalysts, auxiliary substances and/or additives, such as wetting and dispersing agents, degassing agents, flow agents, agents which trap free radicals, antioxidants and/or UV absorbers, thickeners, small amounts of solvents and biocides,
- and in that component I) has been prepared either by a direct dispersing process or by the phase inversion process by means of a dispersing device with a high dispersing output per unit volume, and then has an average particle size of the dispersion particles of 0.05 to 10 μm.
8 more elements
Dependencies are inferred from the claim text.