Process for spinning naphthalate polyester fibers

Details Process for spinning naphthalate polyester fibers Process for spinning naphthalate polyester fibers

1973-11-30

1976-12-28

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264210F, D01D 512

Patent

active

040002390

ABSTRACT:
A filament, fiber or yarn consisting of a naphthalate polyester containing at least 85 mol % of ethylene-2,6-naphthalate units and having an intrinsic viscosity of 0.45 to 1.0, said filament, fiber or yarn having a diffrection intensity ratio (R) between a bragg refection angle 2.theta. = 187.7.degree. and 2.theta. = 15.6.degree., as determined by the X-ray diffraction method, being in the range of more than 1.73 and up to 5.00.
Electrically insulating material can be produced by heat-treating a fabric consisting mainly of the above naphthalate polyester fibers and with a sleeve consisting mainly of the above naphthalate polyester fibers.

REFERENCES:
patent: 2604667 (1952-07-01), Hebeler
patent: 3361859 (1968-01-01), Cenzato
patent: 3452132 (1969-06-01), Petzl
patent: 3486318 (1969-12-01), Cannon et al.
patent: 3549597 (1970-12-01), Kiston et al.
patent: 3616832 (1971-11-01), Shima
patent: 3707593 (1972-12-01), Fukada et al.
patent: 3875119 (1975-04-01), Aoki et al.

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