Multifilament yarn of polyethylene naphthalate and method for pr

Details Multifilament yarn of polyethylene naphthalate and method for pr Multifilament yarn of polyethylene naphthalate and method for pr

1994-06-20

1995-11-14

Edwards, N.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

428364, 428373, 528298, D07G 300

Patent

active

054665256

ABSTRACT:
Multifilament yarn, monofilament, or film, formed at least substantially of polyethylene naphthalate, has a strength of at least 400 mN/tex and a DSC melting point of at least 292.degree. C., where the DSC melting point is measured on a sample quantity of 2.5 mg at a heating rate of 20.degree. C. per min. For production, melted polyethylene naphthalate is extruded from a multi-hole spinneret, the filaments or film, solidified by cooling, are/is withdrawn at a rate of 500 to 10,000 m/min, where the filaments or film are/is subjected to a draw-down B of 40 to 25,000 from the spinneret output to the first withdrawal element. The polymer used may contain at least 85% by weight polyethylene naphthalate and have a melt flow index of 3 to 26.

REFERENCES:
patent: 4000239 (1976-12-01), Hamana et al.
patent: 4026973 (1977-05-01), Shima et al.
patent: 4725472 (1988-02-01), Okabe et al.
patent: 5217762 (1993-06-01), Frank
Wulfhorst, Burkhard; Olbrich, Andreas; "Ein neu entwickeltes Gerat fur die Zugprufung von Garnen mit hohen Verformungsgeschwindigkeiten"; Textil Praxis Internationl, Apr. 1993, pp. 281-284.
Winkler, Friedrich; u.a.: "Dichtebestimmung an Faserstoffen"; Faserforschung und Textiltechnik 18, 1967, pp. 529-533.
Derwent Abstract 88-336128/47 (Sep. 20, 1988).
Derwent Abstract 88-336131/47 (Sep. 20, 1988).

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