Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Rod – strand – filament or fiber
Patent
1996-12-09
1999-03-16
Edwards, Newton
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Rod, strand, filament or fiber
428364, 26417218, B02G 300, B29C 4706
Patent
active
058827935
ABSTRACT:
There are disclosed oriented polyamide fiber which comprises at least 20% by weight of a crystalline polyamide or a copolymerized polyamide each produced by polymerizing a monomer containing m-xylylenediamine as a diamine component and adipic acid as a dicarboxylic acid component each in an amount of at least 70 mol % (A) and which has a Young's modulus of at least 400 kgf/mm.sup.2, a loop strength of at least 4.5 gf/D, a knot tensile strength of at least 3.5 gf/D and a roundness of from 97 to 100%; and a process for producing oriented polyamide fiber which comprises the steps of melting a polyamide resin comprising at least 20% by weight of the above crystalline polyamide or copolymerized polyamide (A); spinning the molten resin through a spinneret; pulling the spun product into a coolant bath placed beneath the face of the spinneret to produce non-oriented yarn; and thereafter orienting the non-oriented yarn to a draw ratio of from 2.5. to 8.0 at a temperature not lower than the Tg of the polyamide and not higher than the melting point thereof, wherein the draft ratio is from 1.0 to 3.0, and the temperature of the coolant bath (T) satisfies the relational expression: Tg-30.ltoreq.T.ltoreq.Tg+10 (.degree.C.). The oriented polyamide fiber is useful for use in sporting goods and industrial materials such as strings for a racket, rubber reinforcing materials and filter cloth materials for paper making by virtue of its improvement in strength, modulus of elasticity and roundness.
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Derwent Publications Ltd., London GB, AN 94-364092, Oct. 11, 1994 of JP 6287807, Mitsubishi Gas Chem. Co.
Harada Masahiro
Shida Takatoshi
Takahashi Makoto
Edwards Newton
Mitsubishi Gas Chemical Company Inc.
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