Chemical modification of (meth)acrylic acid homopolymers and alkyl (meth)acrylate polymers in aqueous systems with amino sulfonic acids
US4604431A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1985 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Nov 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention comprises a method of preparing copolymers of acrylamido sulfonic acids which comprises converting to acrylamido sulfonic groups at least 5 mole % of the acrylic acid or methacrylic acid groups in a polymer which contains at least 5 mole % of these monomers in its structures by reacting an aqueous solution of the acrylic acid or methacrylic acid polymer with an amino sulfonic acid under pressure at a temperature of at least 70.degree. C. for a period of time sufficient to convert at least 5 mole % of the acrylic acid or methacrylic acid groups in the polymer to amido sulfonic acid groups corresponding to the starting amino sulfonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.