Low temperature self-crosslinking aqueous urethane-vinyl polymers for coating applications
US5521246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Jul 25, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is directed to improved aqueous dispersions containing polyurethane/vinyl polymers and to a method for making such aqueous polyurethane-vinyl polymer dispersion. The aqueous dispersions comprise a urethane prepolymer having carboxyl functionality therein and a vinyl monomer polymerized therewith. The improvement in these dispersions resides in shelf-stability and self crosslinkability at low temperature with the polyurethanes having the carboxyl functionality in quaternary form and such dispersions containing polymer having pendant epoxide groups. When the aqueous dispersions are cast as a film and the water removed, crosslinking between the carboxyl group and epoxide group occurs. The aqueous polymer dispersion is prepared by PA1 (a) forming a carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer, PA1 (b) adding a vinyl monomer mixture which contains a polyethylenically unsaturated monomer to the prepolymer to make a prepolymer/monomer mixture, PA1 (c) adding a tertiary amine capable of forming a quaternary ammonium carboxylate to the prepolymer/monomer mixture, PA1 (d) dispersing the prepolymer/monomer mixture in water, PA1 (e)…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.