Stable aqueous polymeric dispersions containing hydrated metal salts of strong acids
US5925701A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1997 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Dec 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An aqueous dispersion comprising a dispersed polymer is disclosed, obtained by combining (i) the dispersed polymer (ii) a hydrated metal salt of a strong acid, and (iii) a polymeric surfactant comprising a hydrophobic component containing an aryl radical containing at least 7 carbon atoms and a hydrophilic block component containing at least six repeat units derived from water-soluble monomers, or a multifunctional block copolymeric surfactant derived from the sequential addition of propylene oxide or higher alkylene oxide units and subsequently ethylene oxide units to a polyamine moiety. It has been found that the addition of such polymeric surfactants in accordance with the invention can stabilize an aqueous polymeric dispersion or latex even when hydrated metal salts of strong acids, such as Al.sub.2 (SO.sub.4).sub.3.18H.sub.2 O, AlCl.sub.3.6H.sub.2 O, Al(NO.sub.3).sub.3.9H.sub.2 O, Zn(NO.sub.3).sub.2.6H.sub.2 O etc., are present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.