Two-component aqueous polyurethane dispersions
US5389718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1994 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | May 26, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/5042
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a two-component, aqueous polyurethane coating composition which may be cured at ambient temperature and which contains PA1 I) a first component based on an aqueously dispersed polyurethane wherein the polyurethane has PA2 a) an average hydroxy functionality of at least 1.8 PA2 b) a total content of urethane and urea groups, calculated as --NH--C--O--, of 9 to 20% by weight, based on the weight of the polyurethane, and PA2 c) sufficient chemically incorporated anionic groups and PA2 d) ethylene oxide units incorporated within terminal and/or lateral polyether chains to maintain the polyurethane stably dispersed in water, and PA1 II) a second component based on a water dispersible polyisocyanate wherein the polyisocyanate has PA2 a) an isocyanate content of 2 to 30% by weight, based on the weight of the polyisocyanate, PA2 b) an average functionality of at least 1.8 and PA2 c) sufficient chemically incorporated anionic groups and PA2 d) ethylene oxide units incorporated within terminal and/or lateral polyether chains to maintain the polyisocyanate stably dispersed in water, and components I and II are present in an amount sufficient to provide an equi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.