Process for preparing polymeric colorants having a poly(vinylamine) backbone
US4275002A · kind A · utility
6Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1977 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | Jan 17, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S534/03
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polymeric colorants are prepared by the process of (a) reacting acetaldehyde and acetamide in a mole ratio of 1:2-4 with an acid catalyst to form ethylidene-bis-acetamide, (b) cracking the ethylidene-bis-acetamide to vinylacetamide, (c) polymerizing the vinylacetamide with a free-radical catalyst, (d) hydrolyzing the resulting polymer with mineral acid and neutralizing with base to yield poly(vinylamine), and (e) coupling monomeric optically chromophoric groups to amine nitrogens of the poly(vinylamine).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.