Resins with reduced epichlorohydrin hydrolyzates
US5256727A · kind A · utility
15Cited by
18References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyamidoamine-epichlorohydrin resin solutions with less than 1500 ppm of epichlorohydrin hydrolyzates after acid stabilization are produced by contacting the resin solution with either (a) dibasic phosphate salts having the general formula M.sub.2 HPO.sub.4 where M represents Na, K, or NH.sub.4, or (b) a nucleophilic alkanolamine at a temperature of less than about 50.degree. C. for a time sufficient to produce a product solution having, after stabilization with acid, less than 1500 ppm of epichlorohydrin hydrolyzates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.