Low VOC, high molecular weight epoxy emulsion coatings
US5252637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1992 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | Jun 12, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D151/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Coating compositions containing aqueous dispersions of higher molecular weight epoxy resin are produced by advancing the molecular weight of an aqueous dispersion of a low molecular weight epoxy resin having a number average molecular weight between about 360 and 2,000. The water dispersed low molecular weight epoxy resins are advanced in molecular weight by coreaction with diphenol at temperatures above about 105.degree. C. and at pressures above about 5 psig to produce the aqueous dispersed high molecular weight epoxy resin. The aqueous dispersed high molecular weight epoxy resin can be further copolymerized with ethylenic monomers, if desired, to produce an acrylic epoxy emulsion binder useful in protective coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.