Patent · US Expired

Heat resistant nonwoven fabric and method of manufacturing same

US4113537A · kind A · utility

2Cited by

4References

8Claims

0Family size

Assignee

Firma Carl Freudenberg · DE

Inventors

Werner Schafer · Essen, DE
Holger Buchwald · Hemsbach, DE
Dieter Bischoff · Fürth, DE

Key dates

Filing date	Dec 3, 1975
Grant date	Sep 12, 1978
Priority date	—
Expiry date	Dec 3, 1995

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/692
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A high-temperature-resistant nonwoven fabric comprising synthetic fibers bonded to one another, said fibers comprising at least one polyaryl amide, polyaryl imide, polyaryl ester or polyaryl anhydride, said fibers being resistant to temperatures up to about 350.degree. C and being resistant to prolonged exposure to a temperature of at least 200.degree. C, is produced by bonding a suitable nonwoven web employing a solution containing a swelling agent and/or a bonding agent for the fiber. If a bonding agent is present, it is of substantially the same composition as the fiber and is precipitated or coagulated by treating the impregnated web with a liquid miscible with the solvent of the solution but which is a non-solvent for the bonding agent. The fabric is washed and dried and then preferably calendered at high temperature so that all the polymeric material is crystallized.

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