Polyurethane polyols and coatings thereof having reduced viscosity
US6753386B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1997 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Dec 16, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a film forming composition, a method of forming the composition, and application of the composition to coating formulations which provide a cured coating having acid rain resistance. A film-forming polyurethane polyol composition comprises a reaction product of an n-functional isocyanate (wherein n is a number ranging from about 2 to about 5) with at least one diol or triol or mixtures thereof and a compound containing isocyanate-reactive functional groups, preferably a monofunctional alcohol or thiol. The low viscosity polyurethane polyol of the present invention is typically crosslinked/cured using a melamine to produce a cured coating which is highly acid etch resistant as well as having other desirable physical-mechanical properties. The coating compositions have improved flow characteristics compared to compositions containing polyurethane polyols prepared without the monofunctional alcohols or thiols. The invention also relates to mixtures of nonfunctional polyurethanes with polyurethane polyols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.