Process of making polyprophylene fibers

Details Process of making polyprophylene fibers Process of making polyprophylene fibers

1995-08-24

1997-04-29

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642108, D01D 512, D01F 606

Patent

active

056246218

ABSTRACT:
A fiber excellent in strength and having an average size of 10,000-0.1 denier can be obtained by extruding a new material composed mainly of a polypropylene having a syndiotactic pentad fraction of 0.7 or more and optionally stretching the resulting extruded material. By using as the raw material a composition consisting of two kinds of polypropylenes each having an intrinsic viscosity .eta..sub.1 or .eta..sub.2, the log(.eta..sub.2 /.eta..sub.1) being more than 0.05 or less than -0.05, and a syndiotactic pentad traction of 0.7 or more at a weight ratio of 95:5-5:95 or a composition consisting of at least 50 parts by weight of a syndiotactic polypropylene having the intrinsic viscosity .eta..sub.1 and a syndiotactic pentad fraction of 0.7 or above and at most 50 parts by weight of an isotactic polypropylene having the intrinsic viscosity .eta..sub.2, the extrudability is improved and the fiber stretching conditions are broadened.

REFERENCES:
patent: 5200131 (1993-04-01), Asanuma et al.

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