Title:
POLYETHYLENE NAPHTHALATE COMPOSITION AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3278914
Kind Code:
B2
Abstract:
PURPOSE: To obtain at good productivity the polyethylene naphthalate composition which can give moldings reduced in the formation of streaky defects on a film surface or reduced in the formation of yarn breaks and having good durability by continuously polycondensing bis(hydroxyethyl) naphthalate.
CONSTITUTION: Bis(hydroxyethyl) naphthalate is continuously polycondensed to obtain the polyethylene naphthalate composition which is a polyester mainly consisting of repeating ethylene naphthalate units, has a terminal carboxyl contentretion of 40 eq./106g or below and diethylene glycol content of 1.3wt.% or below. When the terminal carboxyl concentration is above 40eq./106g, the effect of reducing the formation of streaky defects during film formation and the formation of yarn breaks during spinning is not sufficient. When the ethylene glycol content is above 1.3wt.%, the effect of reducing the formation of streaky defects during film formation and the formation of yarn breaks during spinning is not sufficient.
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Inventors:
Masatoshi Aoyama
Hidema Okasaka
Keisuke Ohshima
Hidema Okasaka
Keisuke Ohshima
Application Number:
JP21168492A
Publication Date:
April 30, 2002
Filing Date:
August 07, 1992
Export Citation:
Assignee:
Toray Industries, Inc.
International Classes:
C08G63/189; C08G63/181; C08G63/78; C08G63/85; (IPC1-7): C08G63/85
Domestic Patent References:
| JP4841947B1 |