Polyurethane coating compositions containing polyether polyols as additives
AssigneeBayer Aktiengesellschaft
InventorsDieter Margotte, Werner Kubitza
Life of this patent
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Abstract
The present invention relates to an aqueous coating composition containing a) an aqueous solution or dispersion of a polyol component containing at least one water-dilutable polyacrylate resin having hydroxyl groups and a molecular weight (M.sub.n) above 500, b) a polyisocyanate component which has a viscosity of 50 to 10,000 mPa.s at 23.degree. C. and is emulsified in component a), and c) 0.5 to 6% by weight, based on the weight of component a), of a water-soluble polyether polyol having a molecular weight of 300 to 1000, wherein the coating composition has an NCO/OH equivalent ratio of 0.5:1 to 5:1, based on the isocyanate groups of component b) and the alcoholic hydroxyl groups of components a) and c).
Claims8
An aqueous coating composition comprising
- a) an aqueous solution or dispersion of a polyol component containing at least one water-dilutable polyacrylate resin having hydroxyl groups and a molecular weight (M.sub.n) 500 to 50,000,
- b) a polyisocyanate component which has a viscosity of 50 to 10,000 mPa.s at 23.degree. C. and is emulsified in component a), and
- c) 0.5 to 6% by weight, based on the weight of component a), of a water-soluble polyether polyol having a molecular weight of 300 to 1000,
- wherein the coating composition has an NCO/OH equivalent ratio of 0.5:1 to 5:1, based on the isocyanate groups of component b) and the alcoholic hydroxyl groups of components a) and c).
An aqueous coating composition comprising
- a) an aqueous solution or dispersion of a polyol component containing at least one water-dilutable polyacryalte resin having a molecular weight (M.sub.n) of 500 to 50,000, a hydroxyl number of 16.5 to 264 mg of KOH/g of solid resin, an acid number of 0 to 150 mg of KOH/g of solid resin and a sulphonate and/or carboxylate group content of 5 to 417 milliequivalents per 100 g of solids,
- b) a polyisocyanate component which has a viscosity of 50 to 10,000 mPa.s at 23.degree. C. and is emulsified in component a), and
- c) 0.5 to 6% by weight, based on the weight of component a), of a water-soluble polyether polyol having a molecular weight of 300 to 1000,
- wherein the coating composition has an NCO/OH equivalent ratio of 0.5:1 to 5:1, based on the isocyanate groups of component b) and the alcoholic hydroxyl groups of components a) and c).
Dependencies are inferred from the claim text.