Dehalogenation of polyamine, neutral curing wet strength resins
US5972691A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/849
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for making polyamine-epihalohydrin resin products having very low levels of epihalohydrin or epihalohydrin hydrolyzates, particularly useful in papermaking, which includes, amongst other features, producing a polyamine-epihalohydrin polymer in aqueous solution, terminating the reaction by cooling, adjusting the pH of the polyamine-epihalohydrin solution to from about 7.5 to about 11 and concurrently heating the solution to about 35 to about 50.degree. C., and contacting the aqueous solution with selected microorganisms or an enzyme, and deactivating or removing the enzymes or microbes, cooling to about 20.degree. C. and stabilizing the composition by adjusting the pH to about 2.0 to 5.0 by the addition of acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.