Water absorbing agent
US4734478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1985 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Jun 26, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2300/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention provides [I] a water-absorbing agent composed of a water-absorbing resin powder having the molecular chains near its surface being crosslinked, said powder being obtained by mixing 100 parts by weight of a powder of a carboxyl-containing water-absorbing resin selected from the group consisting of a hydrolyzate of a starch-acrylonitrile graft polymer, a partially neutralized product of a starch-acrylic acid graft polymer, a saponification product of a vinyl acetate-acrylic ester copolymer, a hydrolyzate of an acrylonitrile copolymer, a crosslinked product of a hydrolyzate of an acrylonitrile copolymer, a hydrolyzate of an acrylamide copolymer, a crosslinked product of a hydrolyzate of an acrylamide copolymer, a partially neutralized product of polyacrylic acid, and a crosslinked product of partially neutralized polyacrylic acid with 0.001 to 10 parts by weight of a polyhydric alcohol, 0.01 to 8 parts by weight of a hydrophilic organic solvent and 0 to 8 parts by weight of water, and heating the mixture at a temperature of at least 90.degree. C. to react the water-absorbing resin powder with the polyhydric alcohol; [II] a water-absorbing agent composed of a mixture of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.