Water-swellable polymers having improved color
US5416160A · kind A · utility
5Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1993 |
| Grant date | May 16, 1995 |
| Priority date | — |
| Expiry date | Oct 12, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F261/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The subject invention pertains to a water-swellable polymer comprising the polymerization product of an .alpha.,.beta.-ethylenically unsaturated monomer in an aqueous phase, initiator, crosslinking agent, and polyvinyl alcohol, the polymerization product having been heated at a temperature greater than about 160.degree. C., wherein the polyvinyl alcohol is less than about 98 percent hydrolyzed, such that the polymerization product has improved whiteness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.