Hydrolysis of polyvinyl aklaenoates
US5753753A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to an improved process for producing a vinyl alcohol containing polymer having a narrow particle size without substantial reactor fouling. The process for producing the vinyl alcohol containing polymer involves hydrolyzing a vinyl ester containing polymer, e.g., a polymer containing polymerized vinyl alkanoate units in the presence of an alcoholic medium and a hydrolysis catalyst in the presence of an alcoholic medium having finely divided, inert material such as an alkali metal carbonate dispersed therein. The finely divided inert material acts as nucleating sites for the polyvinyl alcohol as it precipitates from the solution during hydrolysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.