Polyamide preparation from polycarboxylic acid and polyamine with carbodiimide condensing agent
US4645823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Sep 10, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing polyamides which comprises polycondensing dicarboxylic acids having the following general formula and diamines by using carbodiimides as the condensing agent. ##STR1## wherein X is a group having a valence of (m+2), and C.sub.6-20 carbocyclic group, C.sub.3-20 heterocyclic group, C.sub.2-20 alkyl group, or C.sub.2-20 alkenyl group, the group having at least one carbon-carbon double bond in the position of conjugating to carboxylic acid radical or the group having an .alpha.,.beta.-unsaturated ketone structure; PA0 Y is --OR or --NRR' wherein R and R' each independently is C.sub.5-20 carbocyclic group, C.sub.1-20 heterocyclic group, C.sub.1-20 alkyl group or substituted group thereof having at least one substituent selected from the group consisting of --OW (wherein W is C.sub.1-12 alkyl group), C.sub.2-12 saturated acyl group, C.sub.2-12 saturated acyloxy group, C.sub.2-12 saturated acylamino group, C.sub.2-12 dialkylamino group, --SW (wherein W is the same as defined above), C.sub.2-12 saturated acylthio group and C.sub.3-12 group having at least one silicon atom; PA0 m is 0, 1 or 2; and PA0 --COY can be attached to any of the positions ortho, peri, .beta. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.