Process for making polyamide fiber useful as staple for papermak

Details Process for making polyamide fiber useful as staple for papermak Process for making polyamide fiber useful as staple for papermak

1992-02-11

1993-08-17

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421121, D01F 110, D01F 626

Patent

active

052366529

ABSTRACT:
The invention provides a process for making polyamide fiber with high molecular weight and/or chemical and thermal resistance using conventional single or twin screw extruders. The process includes melt-blending polyamide polymer comprising at least about 75% by weight of poly(hexamethylene adipamide) or poly(.epsilon.-caproamide) and having a formic acid relative viscosity of about 20 to about 50 with a polyamide additive concentrate comprising polyamide polymer and an additive selected from the class consisting of stabilizers, catalysts and mixtures thereof to form a molten polymer which contains about 0.05 to about 2 weight % of the additive and extruding the molten polymer from a spinneret and forming a fiber having a denier per filament of 1 to 40. Fibers made by this process have great utility in the batt of papermaking machine felts where they provide improved resistance to wear and/or chemical attack.

REFERENCES:
patent: 3876725 (1975-04-01), Wells et al.
patent: 4360617 (1982-11-01), Muller et al.
patent: 4624679 (1986-11-01), McEntee
patent: 4874660 (1989-10-01), Davis et al.
Translation of German 1,719,312 (published Feb. 10, 1972).
Ciba-Geigy Technical Bulletin--Irganox 1098--Antioxidant and heat Stabilizer--Published 1981.
Ciba-Geigy Technical Bulletin--Irganox B-Blends--Published 1986.
Derwent Abstract 90-180553/24, "Paper machine felts made from polyamide 11 fibre, showing enhanced durability and chemical resistance" (1990).

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