Process for the production of polyamide-polyureas and dispersions thereof in water
US4160753A · kind A · utility
1Cited by
10References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1977 |
| Grant date | Jul 10, 1979 |
| Priority date | — |
| Expiry date | Nov 7, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K3/15
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The instant invention relates to a process for the production of polyureas wherein solutions of organic polyisocyanates are reacted with primary and/or secondary organic polyamines in the presence of tetracarboxylic acid dianhydrides. The polyisocyanates used are preferably difunctional linear prepolymers containing terminal isocyanate groups, while the amines used are preferably diamines. The resultant product, which contains carboxyl groups, may then be neutralized and dispersed in water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.