Phosphorus acid to stabilize quaternized polyacrylamide
US4195003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | May 8, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S524/922
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for the stabilization of both water-in-oil emulsions and solutions of poly trimethylamino methylol acrylamide is disclosed. The process consists of adding up to the water-in-oil emulsion or solution containing the polymer from 10-50 mole percent of orthophosphorus acid based on the weight of the polymer. Water-in-oil emulsions of polymer are then stabilized by heating the emulsion for a period of time to obtain a stabilized emulsion of a water-soluble quaternary salt of poly trimethylamino methylol acrylamide. Solutions of poly trimethylamino methylol acrylamide need not be heated and are stabilized by the addition of the orthophosphorus acid and mixing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.