Method of making purely primary diamines
US4933396A · kind A · utility
5Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | May 18, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a method for making primary amine terminated linear polyethers of molecular weight above about 3500 which have virtually no contamination from in-chain secondary amine functionalities or amine-terminated tertiary amine side-chains. This method involves the production of novel intermediates. The invention also provides purely linear polyether-polyurea block copolymers formed by chain extension of the primary amine terminated linear polyethers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.