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Patent Searching and Data


Title:
METHOD FOR PRODUCING UNDRAWN POLYESTER YARN
Document Type and Number:
Japanese Patent JP2004060063
Kind Code:
A
Abstract:

To continuously and stably produce an undrawn polyester yarn (a partially oriented yarn) having a favorable color tone with slight quality unevenness and a degree of molecular orientation of 0.03-0.06 as a birefringence index over a long period.

A deposit obtained by heating a specific titanium compound and a specified phosphorus compound in a glycol so as to provide the ratio (P/Ti)of the number of mol of the phosphorus elements to the number of mol of the titanium elements within the range of 1-4 is used as a catalyst. A synthesized polyethylene terephthalate polyester is melted, spun and taken off at 2,500-4,000 m/min speed while being cooled/solidified to afford 0.03-0.06 birefringence index.


Inventors:
HATTORI KEIJIRO
Application Number:
JP2002000216418
Publication Date:
February 26, 2004
Filing Date:
July 25, 2002
Export Citation:
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Assignee:
TEIJIN LTD
International Classes:
D01F6/62; (IPC1-7): D01F6/62
Attorney, Agent or Firm:
三原 秀子