Low VOC clear coating composition for basecoat clear coat finish
US5227201A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1991 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Jun 20, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D2502/005
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved process for forming multiple coats of finishes on a substrate by sequential (a) applying to the substrate a layer of a color basecoat composition of waterborne coating composition of an acrylic polymer latex contains pigment; (b) applying to the layer of color basecoat composition before it is fully cured a clear coat composition of an acrylic polymer having crosslinkable groups and a crosslinking agent in a volatile organic solvent and (c) subsequently simultaneously curing the basecoat composition and the clear coat composition; the improvement used therewith comprises a solvent based clear coating composition having a binder of about PA0 40-95% by weight of an acrylic polymer having at least two alkyl methacrylates having 2-12 carbon atoms in the alkyl group, PA0 a hydroxy alkyl methacrylate having 2-4 carbon atoms in the alkyl group and having a weight average molecular weight of about 3,000-10,000 and a glass transition temperature of about -20.degree. to +50.degree. C.; and PA0 5-60% by weight an organic polyisocyanate; wherein the clear coat when cured has a water vapor permeability value of about 1400-3200.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.