Carboxylic acid thickener having improved performance under alkaline conditions
US5475047A · kind A · utility
4Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | May 17, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/50
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An alkaline mixture of a cross-linked carboxylic acid copolymer having improved performance under alkaline conditions, such as a pH of 10 or higher which is a copolymer of a monomeric mixture of 6.5 to 97 phr of a carboxylic acid and 0.5 to 30 phr of an N-substituted acrylamide, such as isopropyl acrylamide, diacetone acrylamide, t-octylacrylamide, or t-butylacrylamide, which copolymer is cross-linked with 0.05 to 5 percent by weight based upon the weight of the copolymer of a polyunsaturated cross-linking agent, and an alkali or alkaline earth hydroxide, carbonate, phosphate or amine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.