Highly absorbent graft copolymers of polyhydroxy polymers, acrylonitrile, and acrylic comonomers
US4134863A · kind A · utility
46Cited by
13References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 6, 1976 |
| Grant date | Jan 16, 1979 |
| Priority date | — |
| Expiry date | Dec 6, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Absorbent compositions comprising graft copolymers of acrylonitrile and starch, or related polyhydroxy polymers, are prepared by improved methods of synthesis. Mixing the acrylonitrile with selected water-soluble acrylic comonomers enables unexpected improvements including reduction of the saponification time, total elimination of the base-saponification step, elimination of the starch gelatinization step, preparation of products which absorb large amounts of aqueous fluids under highly acidic conditions, and preparation of products which absorb over 5000 times their weight of deionized water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.