Alkali-soluble resin (ASR) shell epoxy RDP with divalent metal ions exhibiting improved powder redispersibility
US9574053B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 10, 2013 |
| Grant date | Feb 21, 2017 |
| Priority date | — |
| Expiry date | Nov 26, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2433/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides multilayer polymer redispersible powder (RDP) particles comprising a major proportion of from 50 to 90 wt. %, preferably, from 60 to 85 wt. %, based on total polymer solids, of epoxy resin resins having a calculated glass transition temperature (Tg) of from 0 to 40° C., a methacrylic acid containing alkali soluble polymer outer layer, and a divalent metal, such as zinc powder, having an aqueous pKa of 9.55 or more, or its acid salt having a pH of 7.0 or less, such as strong acid salts, e.g., chlorides, sulfates or phosphates, or organic acid salts, e.g., acetates, succinates and citrates, as well as to methods of making the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.