Zero VOC, aqueous dispersed, polyester modified acrylic-epoxy microgel polymers
US5576361A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Apr 20, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Protective coating compositions free of volatile organic solvents and particularly useful as can coatings are produced based on an aqueous dispersed microgel polymeric binder comprising between about 1% and 70% low molecular weight polyester diluent, between about 1% and 70% epoxy resin, between about 10% and 80% addition copolymer, and between about 1% and 40% low molecular weight diepoxide crosslinking resin. The aqueous dispersed solvent free microgel polymer is produced by mixing the polyester diluent with high molecular weight epoxy to produce a fluid resin mixture, copolymerizing in-situ ethylenically unsature monomers including carboxyl monomers in the presence of the fluid resin mixture and dispersing the resulting polymeric mixture into water. Low molecular weight diepoxide resin is added and crosslinked with carboxyl functionality to produce the microgel polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.