Method of making siloxane-based polyamides
US5981680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Jul 13, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method of making siloxane-based polyamides which includes at least one repeating unit represented by the formula ##STR1## wherein X is a linear or branched C.sub.1 -C.sub.30 alkylene chain; Y is a linear or branched C.sub.1 -C.sub.20 alkylene chain; DP is an integer having a value of 10-500; n is an integer having a value of 1-500. The method involves heating an intimate reaction mixture containing an olefinic acid and an organic diamine at a temperature greater than 100.degree. C. and forming an organic diamide; and thereafter reacting the organic diamide with a hydride-terminated polydimethylsiloxane in the presence of a hydrosilylation catalyst to form the siloxane-based polyamide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.