Compositions for on-site mannich polymer process
US4405728A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1982 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Jan 15, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The abstract of the disclosure is a method of rapidly preparing a dilute aqueous solution of poly N,N lower dialkylaminomethyl acrylamide and copolymers thereof having a molecular weight greater than 500,000 and a cationic charge of 1-90% which comprises: PA0 A. forming a water-in-oil emulsion of polyacrylamide or copolymers thereof, said water-in-oil emulsion containing in weight percentages: PA1 (1) 5 to 60% polymer; PA1 (2) 5 to 75% hydrophobic liquid; PA1 (3) 0.1 to 21% water-in-oil emulsifying agent; PA1 (4) 2 to 90% water; PA0 B. adding to the water-in-oil emulsion of step A a water soluble salt of a secondary amine having alkyl groups containing 1-3 carbon atoms in an amount, so as to provide 0.1-1.1 moles of secondary amine for each mole of amide functionality on said polymer; PA0 C. preparing a dry formaldehyde composition by mixing together: PA1 (1) paraformaldehyde; PA1 (2) dry alkalinity control agent PA1 (3) water-soluble high HLB surfactant capable of inverting the water-in-oil emulsion of step A; PA0 D. mixing together the water-in-oil emulsion containing the lower alkyl secondary amine salt with a quantity of the dry formaldehyde composition sufficient to provide fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.