Process for producing fine polyamide/polystyrene fibers

Details Process for producing fine polyamide/polystyrene fibers Process for producing fine polyamide/polystyrene fibers

1972-01-24

1976-10-05

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264148, 264151, 264210F, 264DIG47, B29H 718

Patent

active

039845141

ABSTRACT:
A process is disclosed for producing extremely fine polyamide/polystyrene fibers which include the steps of forming a molten blend consisting of from about 35 weight percent up to about 45 weight percent of a polyamide, preferably polycaprolactam and, correspondingly, from about 65 weight percent down to about 55 weight percent of a polystyrene, forcing this molten blend through an extrusion die to form a structure such as a strand, monofilament, sheet or film, melt drawing the extruded structure at a draw ratio of at least 4:1 to orient the same and thereby obtain a fibrillatable structure, and thereafter mechanically fibrillating the oriented, fibrillatable structure by cold drawing whereby the structure spontaneously and completely breaks up into extremely fine polyamide/polystyrene fibers. The blend may optionally additionally contain up to about 15 weight percent of an ethylene/acrylic acid copolymer containing about 20 weight percent acrylic acid.

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