Highly water-absorptive polymers having enhanced gel strength
US5973042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1996 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jun 11, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/098
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is provided a highly water-absorptive polymer composition comprising: PA1 (A) 100 parts by weight of a highly water-absorptive polymer having a crosslinked structure, comprising as its constituent a carboxyl group and/or a carboxylate group; and PA1 (B) 0.05 to 10 parts by weight of an additive selected from the group consisting of an oxalic acid (salt) compound, a sulfate of a metal selected from titanium, zirconium and vanadium, and a crystalline or noncrystalline, high-purity particulate titania having a mean particle diameter of 1 .mu.m or less, a specific surface area of 10 m.sup.2 /g or more as determined by the Brunauer-Emmett-Teller method, and, when crystalline, a crystal structure of a mixed type of rutile and anatase. There is also provided a method for producing a highly water-absorptive polymer having enhanced gel strength, which comprises treating with an alkoxytitanium a highly water-absorptive polymer having a crosslinked structure, comprising as its constituent a carboxyl group and/or a carboxylate group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.