Title:
PREPARATION OF POLYESTER WITH EXCELLENT COLOR TONE
Document Type and Number:
Japanese Patent JP2514759
Kind Code:
B2
Abstract:
PURPOSE: To obtain polyester which has a good color tone and a small content of diethylene glycol and is suitable for applications such as textile fibers, films for magnetic tapes, food containers, and other industrial materials.
CONSTITUTION: A method for producing a polyester comprising a first step in which ethylene glycol and terephthalic acid are reacted to produce an oligomer which has an average degree of polymerization of 5 or less and a bis(beta- hydroxyethyl)terephthalate structure, a second step in which part of the oligomer is polycondensed in the presence of a catalyst and a stabilizer to produce a prepolymer having an average degree of polymerization of 10-50 and a bis(beta- hydroxyethyl)terephthalate structure, and a third step in which the oligomer and the prepolymer are polycondensed.
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Inventors:
KIN TEIYUTSUPU
CHO KENNAN
CHO KENNAN
Application Number:
JP30265591A
Publication Date:
July 10, 1996
Filing Date:
October 23, 1991
Export Citation:
Assignee:
KANKOKU KAGAKU GIJUTSU KENKYUSHO
International Classes:
C08G63/183; C08G63/78; (IPC1-7): C08G63/78; C08G63/183
Domestic Patent References:
| JP624722A |
Attorney, Agent or Firm:
Hajime Tsukuni (1 person outside)