Preparation of a multicoat coating, water-thinnable coating compositions, water-thinnable emulsion polymers and preparation of water-thinnable emulsion polymers
US5635564A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1994 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Jun 24, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31573
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A process for the preparation of multicoat coatings in which a pigmented aqueous basecoat composition is used which comprises a water-thinnable emulsion polymer as the film-former. The water-thinnable emulsion polymer is prepared in a two-stage emulsion polymerization. The first stage gives rise to a polymer having a glass transition temperature (T.sub.G1) of +30.degree. to +110.degree. C. In the second stage a mixture of monomers is polymerized in the presence of the polymer prepared in the first stage which by an exclusive polymerization gives rise to a polymer having a glass transition temperature (T.sub.G2) of -60.degree. to +20.degree. C. The hydroxyl value of the emulsion polymer is between 2 and 100.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.