Two component waterborne crosslinkable polyurethane/acrylate-hybrid systems
US5594065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1995 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | May 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/672
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved two component coating system based upon crosslinkable hydroxy containing polymers and a polyisocyanate crosslinker. The improvement resides in the utilization of a water-borne hydroxy-terminated polyurethane prepolymer/acrylate hybrid, preferably a hydroxy acrylate hybrid, in combination with a water-dispersible polyisocyanate. The two component coating composition can be prepared by: PA1 a) forming a carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer, PA1 b) adding at least one acrylic monomer which contains a hydroxy-group to the carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer to form a prepolymer/monomer mixture, PA1 c) adding an alkanolamine to the prepolymer/monomer mixture to introduce hydroxy functionality into the polyurethane prepolymer, PA1 d) dispersing the prepolymer/monomer mixture in water, PA1 e) adding an oil-soluble free radical initiator and a hydroxy-containing chain extender to the aqueous dispersion, PA1 f) polymerizing the acrylic monomers and completing the chain extension of the prepolymer by heating the aqueous dispersion, and PA1 g) mixing the resulting hybrid dispersion wit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.