Wholly aromatic polyamide fiber non-woven sheet and processes fo

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond

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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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