Novel viscosifiers for salt-containing solutions based on polymer complexes
US4970260A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1988 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | May 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T70/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A polymeric solution comprising: water; about 0.005 to about 0.5 moles of an inorganic acid, an inorganic case or an inorganic salt per 100 ml of such water; and about 0.1 to about 5.0 grams of a polymeric complex per 100 grams of said water, said polymeric complex produced by the interaction of a first water soluble copolymer formed from a water soluble nonionic monomer and an anionic comonomer by a free radical copolymerization, said first water soluble nonionic monomer being selected from the group consisting of acrylamide, methacrylamide and vinylpyrrolidone, said anionic comonomer being about 1 to about 35 weight percent of said first water soluble copolymer, said anionic comonomer containing anionic groups, said anionic comonomer being selected from the group consisting of metal styrene sulfonate, metal vinyl sulfonate, and a metal salt of 2-acrylamide-2-methyl propane sulfonate; and a second water soluble copolymer formed from a second water soluble monomer and a cationic comonomer by a free radical copolymerization, said second water soluble monomer being selected from the group consisting of acrylamide, methacrylamide and vinyl pyrrolidone, said cationic comonomer being ab…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.