Method for rapidly producing amino methylated polymers and quaternary ammonium salts thereof
US4179424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved process for rapidly preparing amino methylated derivatives of dilute aqueous solutions of acrylamide polymers which comprises the steps: PA1 A. Preparing a 2.8-6% aqueous solution of an acrylamide polymer which has a molecular weight of at least 500,000; PA1 B. Adding to the solution formed in A approximately 1 mole of formaldehyde and approximately 1 mole of a dialkyl amine which contains from 2-4 carbon atoms based on the amide content of the acrylamide polymer under conditions of good agitation; PA1 C. Reacting the acrylamide polymer with the formaldehyde and the dialkyl amine at a temperature between 80-100.degree. C. for a period of time ranging between 2-15 minutes to form an amino methylated acrylamide polymer. C.sub.1 -C.sub.4 alkyl quaternary ammonium salt derivatives of these amino methylated acrylamide polymers may be prepared by adjusting the pH to 8.4-8.7 and reacting them with a lower alkyl quaternizing agent at a temperature ranging between 50.degree.-80.degree. C. for a period of time ranging between 2-5 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.