Process for melt extruding a surface-segregatable thermoplastic

Details Process for melt extruding a surface-segregatable thermoplastic Process for melt extruding a surface-segregatable thermoplastic

1990-01-17

1991-10-15

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421112, 26421113, 26421114, 264237, 264348, D01F 110

Patent

active

050572628

ABSTRACT:
Processing by melt extrusion a surface-segregatable, melt-extrudable thermoplastic composition to form a fiber or film having a differential, increasing concentration of an additive from the center of the fiber or film to the surface thereof, which differential, increasing concentration imparts to the surface of the fiber or film at least one desired characteristic which otherwise would not be present, which composition includes at least one thermoplastic polymer and at least one defined additive. During formation of the fiber or film, the additive rapidly segregates in a controllable manner toward the newly-formed surface of the fiber or film, thereby resulting in a controllable differential concentration of the polymeric material, which concentration increases with increasing distance from the center of the fiber or film to its surface.

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