Waterborne coating composition
US11084953B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2020 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Jan 23, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/286
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a method of making an aqueous coating composition comprising a blend of at least a first aqueous polymer dispersion and a second aqueous polymer dispersion comprising a film-forming second polymer wherein the first aqueous polymer dispersion comprises a first polymer having a number average molecular weight, Mn, of from 2000 to 120000, an acid value of 30 to 150 mg KOH/g, a glass transition temperature Tg of at least 20° C. as calculated with the Fox formula, and an ethylene-oxide content of from 1 to 20 wt %, the method comprising blending an aqueous dispersion of the first polymer having a solids content of 25 to 50 wt % and a pH of 4.5 to 8.0 with an aqueous dispersion of the second polymer having a solids content of 25 to 55 wt % and a pH of 4.5 to 8.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.