Patent · US Expired

Film of aromatic copolyamide from bis(aminophenoxy) benzene

US4981943A · kind A · utility

1Cited by

1References

13Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Friedrich Herold · Hofheim, DE
Gunther Keil · Hofheim, DE
Werner Bruckner · Kriftel, DE
Jutta Cardinal
Cynthia Bennett · Wiesbaden, DE

Key dates

Filing date	Aug 11, 1988
Grant date	Jan 1, 1991
Priority date	—
Expiry date	Aug 11, 2008

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31725
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A film made from aromatic copolyamides of the dicarboxylic acid diamine type, whose shaping substance comprises certain recurring structural units and which has specific criteria regarding Staudinger index, tear strength, volume resistance, electrical dielectric strength, dimensional stability and water absorption, a process for its production, and the use of the film for the production of heat-resistant insulation material or as a substrate for flexible circuit boards.

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