Title:
METHOD FOR PRODUCING COPOLYESTER USING TITANIUM DIOXIDE/ SILICON DIOXIDE COPRECIPITATE CATALYST IN FORM OF SUSPENSION IN GLYCOL
Document Type and Number:
Japanese Patent JP3438072
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a polyester resin which has not only excellent processability but also excellent transparency and chromaticity and is copolymerized from a glycol such as 1,4-cyclohexanedimethanol, etc., and a dicarboxylic acid.
SOLUTION: This method for producing a copolyester resin comprises a step for esterifying a dicarboxylic acid with ethylene glycol and another glycol and a step for polycondensing the esterification product in the presence of a titanium dioxide/silicon dioxide coprecipitate catalyst, the catalyst being in the form of 4% or less content by weight suspension in glycol, in which the copolyester resin has the other glycol content ranging from 20 to 80% of the total glycol content.
Inventors:
John Ze-Young
Hong Yun-Hee
Kim Sung-Ki
Hong Yun-Hee
Kim Sung-Ki
Application Number:
JP2002231602A
Publication Date:
August 18, 2003
Filing Date:
August 08, 2002
Export Citation:
Assignee:
SK Chemicals Co., Ltd.
International Classes:
C08G63/183; C08G63/181; C08G63/85; C08K5/49; (IPC1-7): C08G63/85
Other References:
【文献】米国特許5684116(US,A)
Attorney, Agent or Firm:
Nobuo Kaida (3 outside)