Novel naphthalate polyester fibers, and their end uses

Details Novel naphthalate polyester fibers, and their end uses Novel naphthalate polyester fibers, and their end uses

1975-09-18

1977-01-04

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

260 75R, 264290T, 428266, 428290, 428391, 428396, 428447, B32B 2704

Patent

active

040014797

ABSTRACT:
A filament, fiber and yarn consisting of a naphthalate polyester containing at least 85 mol % of ethylene-2,6-naphthalate units and having an intrinsic viscosity of 0.3 to 1.0, said filament, fiber and yarn having a diffraction intensity ratio (R) between a Bragg reflection angle 2.THETA. = 18.7.degree. and 2.THETA. = 15.6.degree., as determined by the X-ray diffraction method, being in the range of 0.15 to 1.73.
Electrically insulating material can be produced by heat-treating a fabric consisting mainly of the above naphthalate polyester fibers.

REFERENCES:
patent: 3123587 (1964-03-01), Hogsed
patent: 3452132 (1969-06-01), Pitzl
patent: 3616832 (1971-11-01), Shima et al.
patent: 3637910 (1972-01-01), Shima et al.

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