Aqueous polymer emulsion-polyester polyol blend for reducing or eliminating flooding and floating in water-based two component polyurethane coatings
US6395820B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1999 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Nov 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A substantially solvent free, aqueous, pigmented, two component polyurethane-polyurea dispersion comprising:(a) an aqueous mixture of an acid-containing polymeric polyol and a polyol free of acid groups, wherein the mixture has an average hydroxyl functionality of at least 1.5 and an acid number between about 15 and 200; andan amine or a blend of amines having an average active hydrogen functionality of at least 1.5, the amine or blend of amines being present in a sufficient amount to substantially neutralize the acid-containing polymeric polyol;(b) one or more polyisocyanates; and(c) two or more different pigments;characterized by reducing or eliminating flooding of the pigments with(d) an aqueous polymer emulsion present in an amount sufficient to impart thixotropy to the mixture of (a) and (d).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.