Wholly aromatic polyamide fiber non-woven sheet and processes fo

Details Wholly aromatic polyamide fiber non-woven sheet and processes fo Wholly aromatic polyamide fiber non-woven sheet and processes fo

1983-04-18

1984-11-13

Kendell, Lorraine T.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428296, 428299, 428397, 4283115, 4283155, B32B 2700, D02G 300

Patent

active

044826036

ABSTRACT:
A wholly aromatic polyamide fiber non-woven sheet having satisfactory density, impregnating property, heat resistance, and surface evenness, comprises mutually, randomly entangled fibers consisting essentially of a wholly aromatic polyamide having 85 molar % or more of at least one type of recurring units selected from those of the formulae (I) and (II): ##STR1## The non-woven sheet is characterized in that the wholly aromatic polyamide fibers have portions thereof having a flattened cross-sectional profile; the aromatic polyamide fibers are fuse-bonded to each other at least at portions thereof intersecting each other; and the sheet includes pores connected to each other, and having a size at the peak of pore size distribution, of 13 microns or less determined by means of a mercury porosimeter, and no voids isolated from each other, and has a porosity of from 5% to 40% and an air permeability rate of from 0.1 to 10,000 sec/100 ml.

REFERENCES:
patent: 3094511 (1963-06-01), Hill, Jr. et al.
patent: 3393210 (1968-07-01), Speck
patent: 3756908 (1973-09-01), Gross
patent: 3819569 (1974-06-01), Baird
patent: 3937860 (1976-02-01), Gusman et al.
patent: 3956561 (1976-05-01), Anderson
patent: 4113537 (1978-09-01), Schafer et al.

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