Process for producing an aromatic polyester fiber

Details Process for producing an aromatic polyester fiber Process for producing an aromatic polyester fiber

1983-04-19

1985-03-05

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264140, 264176F, 5283082, B29B 102, B29B 300, B29F 300

Patent

active

045030057

ABSTRACT:
In a process for producing an aromatic polyester fiber of high strength and high modulus of elasticity represented by the prescribed general formula, a process comprising grinding a polymer of the prescribed general formula to form ground particles having diameters of less than 3 mm and an average particle diameter of 0.5 mm or smaller; heat-treating the particles for 0.5 to 30 hr at a temperature between 100.degree. and 350.degree. C., at which temperature the particles do not fuse; melt-spinning the heat-treated particles at a temperature of 250.degree. to 450.degree. C. if the particles have a melt property such that the temperature at which the particles possess a shear rate of 51/sec (48,000 poise as melt viscosity) under a shear stress of 2.45.times.10.sup.6 dynes/cm.sup.2 is in the range of 200.degree. to 350.degree. C.; and thereafter heat-treating the resulting fiber for 0.5 to 50 hr at a temperature between 250.degree. and 450.degree. C., at which temperature the fiber does not fuse.

REFERENCES:
patent: 3354250 (1967-11-01), Killoran et al.
patent: 3975487 (1976-08-01), Cottis et al.
patent: 4115357 (1978-09-01), Deex et al.
patent: 4294955 (1981-10-01), Harris
patent: 4349659 (1982-09-01), Kato et al.

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