Alkyl resin emulsions and utilization of the same
AssigneeAshland-Sudchemie-Kernfest GmbH
InventorsPeter Kuhlmann, Reinhard Winter
Life of this patent
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Abstract
A two-component water paint system that allows reliable formation of essentially bubble-free paint films having a thickness of at least 120 μm. The water paint system comprises an aqueous emulsion of a hydroxy-functional alkyd resin wherein the hydroxy-functional alkyd resin can be obtained from an oleic or fatty acid component, a polyvalent alcohol, a polyether polyol having a molecular weight of 400 to 8,000, a monobasic carboxylic acid and a polycarboxylic acid or the anhydride thereof.
Claims20
Two-component water paint system comprising an isocyanate as the first component and an aqueous emulsion of a hydroxy-functional alkyd resin as the second component, wherein the alkyd resin can be obtained from an oleic or fatty acid component, a polyvalent alcohol, a polyether polyol having a molecular weight of 400 to 8,000, a monobasic carboxylic acid and a polycarboxylic acid or the anhydride thereof, and wherein the first component and second component are formulated to provide a paint containing at least a stoichiometric ratio of isocyanate groups to hydroxyl groups with no more than 30% of the hydroxyl groups being pre-react with isocyanates.
Process for the preparation of a water paint system, comprising the steps of:
- A) providing an isocyanate as a first component, and
- B) preparing an aqueous emulsion of a hydroxy-functional alkyd resin comprising:
- i) reacting an oleic or fatty acid, a polyvalent alcohol, a polyether polyol having a molecular weight of 400 to 8,000, a monobasic carboxylic acid and a polycarboxylic acid or the anhydride thereof to obtain a hydroxy-functional alkyd resin,
- ii) neutralizing the hydroxy-functional alkyd resin with ammonia or amine,
- iii) emulsifying the hydroxy-functional alkyd resin in water to provide a second component, and
- iv) mixing the first component and second component to provide a paint containing at least a stoichiometric ratio of isocyanate groups to hydroxyl groups with no more than 30% of the hydroxyl groups being pre-reacted with isocyanates.
Dependencies are inferred from the claim text.