Stock material or miscellaneous articles – Structurally defined web or sheet – Physical dimension specified
Patent
1975-12-03
1978-09-12
Bell, James J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Physical dimension specified
428288, 428290, 428296, 428474, B32B 2702
Patent
active
041135377
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.
REFERENCES:
patent: 3094511 (1963-06-01), Hill et al.
patent: 3203933 (1965-08-01), Huffman et al.
patent: 3354127 (1967-11-01), Hill et al.
patent: 4029835 (1977-06-01), Iwata et al.
Bischoff Dieter
Buchwald Holger
Schafer Werner
Bell James J.
Firma Carl Freudenberg
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