Patent · US Expired

Polyamide-imide precondensates

US4121266A · kind A · utility

7Cited by

4References

2Claims

0Family size

Assignee

BASF SE

Inventors

Jenoe Kovacs · Heßheim, DE
Hans Jung · Ludwigshafen, DE
Matthias Marx · Fürstenfeldbruck, DE
Herbert Spoor · Schifferstadt, DE

Key dates

Filing date	Jun 7, 1976
Grant date	Oct 17, 1978
Priority date	—
Expiry date	Jun 7, 1996

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31623
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A polyamide-imide precondensate which is solid at room temperature, but is fusible and soluble in polar solvents. It is manufactured by first condensing 1 mole of diamine with 2 moles of tricarboxylic acid anhydride in a diol as the solvent, to give a diimide-dicarboxylic acid, then esterifying the diimide-dicarboxylic acid with the diol and finally effecting the polycondensation by adding 1 mole of diamine per mole of diester. The precondensate may be used, as a melt, as a solution in organic solvents or as an aqueous dispersion, for coating electrical conductors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.