Solid state process for modification of polyvinyl alcohol using Michael-type addition
US5350801A · kind A · utility
4Cited by
7References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 7, 1993 |
| Grant date | Sep 27, 1994 |
| Priority date | — |
| Expiry date | Jul 7, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A solid state process for modifying polyvinyl alcohol using a Michael-type addition wherein dry polyvinyl alcohol powder is sprayed with a solution of a monomer capable of Michael-type addition in an amount sufficient to swell the polyvinyl alcohol or maintain its swollen state, but not dissolve or form a slurry of the polyvinyl alcohol. The swollen polyvinyl alcohol is sprayed with a catalyst and the temperature is raised to initiate the reaction between the polyvinyl alcohol and the monomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.