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Title:
PRODUCTION OF POLYETHYLENE TEREPHTHALATE HAVING HIGH POLYMERIZATION DEGREE
Document Type and Number:
Japanese Patent JPH083301
Kind Code:
A
Abstract:

PURPOSE: To provide a process for producing a polyethylene terephthalate having high quality and polymerization degree without generating flow failure at a gas-liquid interface in polymerization reaction.

CONSTITUTION: The polycondensation reaction after an esterification reaction is divided into a former-stage polycondensation step to get a polyethylene terephthalate having an intrinsic viscosity [η] of 0.4-0.9dλ/g and a latter-stage polycondensation step to get a polyethylene terephthalate having an intrinsic viscosity [η] of 0.8-1.3dλ/g. The latter-stage polycondensation is carried out by a stirring polymerizer having plural rotary shafts 12, 13 and stirring blades composed of paddles 21-26 and 31-36 perpendicularly attached to the rotary shafts interposing gaps in the direction of the shaft and scrapers 41-46 and 51-56 attached to the tip ends of the paddles and having a length nearly corresponding to the dimension of the gaps. The stirring blade has an L/D ratio of 2-10, preferably 4-8 wherein D is rotary diameter of the blade and L is the length of the blade in longitudinal direction.


Inventors:
OMOTO SETSUO
SHIMADA TAKAFUMI
KONDO MASAMI
Application Number:
JP14313594A
Publication Date:
January 09, 1996
Filing Date:
June 24, 1994
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
B01J19/18; C08G63/181; C08G63/183; C08G63/78; C08G85/00; (IPC1-7): C08G63/78; B01J19/18; C08G63/183
Attorney, Agent or Firm:
Akasaka Saka (1 person outside)