Homogeneous copolyamide comprised of hexamethylenediamine/adipic acid/short chain diacid/dimer acid and catalytic preparation thereof
US4680379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1986 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Feb 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G69/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Homogeneous, high melting, flexible copolyamides, adopted as molding compositions and for textile applications, are conveniently prepared by (a) prepolymerizing either (i) mixture of adipic acid and hexamethylenediamine, or admixture thereof with at least one other short-chain dicarboxylic acid, or (ii) mixture of (1) a salt of adipic acid, or salt of admixture of adipic acid with at least one other short-chain dicarboxylic acid, and hexamethylenediamine, together with (2) free hexamethylenediamine, said prepolymerization (a) being carried out in the presence of a catalytically effective amount of a strong inorganic oxyacid, or strong organic oxyacid other than a carboxylic acid, or alkali or alkaline earth metal thereof, said resulting prepolymer having amino end groups, and thence (b) polycondensing said prepolymer with a fatty acid dimer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.