Process for producing quality-improved water-absorbent polymers and products
US5115011A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2300/10
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This invention relates to a process for producing a quality-improved water-absorbent polymer in which the aqueous liquid (I), which is obtained by mixing in an aqueous medium at least one kind of a water-soluble salt (A) selected from a group of halogenated compounds, sulfates, acetates, and nitrates, which are derived from at least one kind of a polyvalent metal selected from a group of aluminum, calcium, and magnesium, with at least one kind of a water-soluble salt (B) selected from a group of monovalent metal salts and ammonium salts, which are derived from at least one kind of an oxyacid selected from a group of sulfurous acid and thiosulfuric acid, is mixed with a water-absorbent polymer (II) in a proportion of that the water-soluble salt of the polyvalent metal (A) is in a range of 0.1.about.10 parts by weight against 100 parts by weight of the water-absorbent polymer (II) and the water-soluble salt of the oxyacid (B) is in a range of 0. 1.about.10 parts by weight against 100 parts by weight of the water-absorbent polymer (II). The mixture which is obtained by mixing the aqueous liquid (I) with the water-absorbent polymer (II) has relatively-improved capacities in the fluidit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.