Aqueous two-component polyurethane coating compositions and a method for their preparation
First Claim
1. A bimodal aqueous coating composition containing in dispersed form as binder an isocyanate-reactive component and a polyisocyanate component, in which these components have a particle size distribution having a first distribution maximum at a particle size of 40 to 200 nm and a second distribution maximum at a particle size of 200 to 2,000 nm, provided that the particle sizes of the distribution maxima differ by a factor of at least 2.
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Abstract
A method is described for the preparation of aqueous coating compositions based on resin binders containing isocyanate-reactive hydrogen atoms and polyisocyanates, by mixing the components with water, wherein the mixture is forced at a pressure of from 1 to 30 MPa through a nozzle of small size in at least one dimension.
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Citations
14 Claims
- 1. A bimodal aqueous coating composition containing in dispersed form as binder an isocyanate-reactive component and a polyisocyanate component, in which these components have a particle size distribution having a first distribution maximum at a particle size of 40 to 200 nm and a second distribution maximum at a particle size of 200 to 2,000 nm, provided that the particle sizes of the distribution maxima differ by a factor of at least 2.
- 3. A process for the preparation of an aqueous coating composition containing an isocyanate-reactive component and a polyisocyanate component by mixing the components with water and forcing the mixture at a pressure of 1 to 30 MPa through one or more nozzles having an opening of about 0.2 to 1 mm in at least one dimension.
Specification