Method of coating dual protective layers
US4590097A · kind A · utility
Inventors
Key dates
| Filing date | Dec 14, 1984 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Dec 14, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D1/325
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A solvent-resistant barrier coating is used beneath a polyurethane top coat, for example for coating aircraft. The barrier coating comprises a film-forming addition polymer comprising units of a vinyl aromatic monomer and units of a monomer containing a hydroxy alkyl group and a polyisocyanate containing at least 2 isocyanate groups per molecule. The addition polymer has a hydroxyl content in the range 0.5 to 5 percent by weight due to the presence of the hydroxy alkyl groups and preferably contains at least 30 percent by weight of the vinyl aromatic monomer. The ratio of isocyanate groups to hydroxyl groups is in the range 1:1 to 2:1. The polyurethane top coat can be removed from the substrate by a stripping solvent such as methylene chloride without removing the barrier coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.