High build polyurethane coating
US6274639A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K7/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved durable, low density, high build polyurethane coating is disclosed, as well as its method of manufacture. A slow reacting polyisocyanate is combined with a polyol so as to form a uniform mixture with an extremely long pot life. The low viscosity uniform mixture can then be sprayed onto a substrate using a conventional spray gun. A polyurethane catalyst is introduced after formation of the uniform mixture, preferably via a second spray nozzle so that catalyst is externally mixed into the polyisocyanate/polyol spray stream. This is a 100%, or near 100%, solids system so that there is very low volatile organic compound emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.