Title:
PRODUCTION OF UNSATURATED POLYESTER
Document Type and Number:
Japanese Patent JP3228806
Kind Code:
B2
Abstract:
PURPOSE: To produce an unsaturated polyester having excellent boiling-water resistance at a low cost.
CONSTITUTION: A process for producing an unsaturated polyester by esterifying a component comprising an α,β-unsaturated polybasic acid or its anhydride and a saturated polybasic acid or its anhydride with a glycol component consisting essentially of at least one member selected from the group consisting of ethylene glycol, propylene glycol and diethylene glycol, wherein either the pressure in the reaction system is reduced to 10Torr or below or deglycolation is conducted under a reduced pressure of 5Torr or below when the acid value reaches 90-25 during the esterification reaction.
Inventors:
Michiaki Arai
Katsuhisa Morita
Isamu Niikura
Katsuhisa Morita
Isamu Niikura
Application Number:
JP80993A
Publication Date:
November 12, 2001
Filing Date:
January 06, 1993
Export Citation:
Assignee:
Showa High Polymer Co., Ltd.
International Classes:
C08G63/52; C08G63/78; (IPC1-7): C08G63/78
Domestic Patent References:
| JP4183715A | ||||
| JP4183714A | ||||
| JP3220232A |
Attorney, Agent or Firm:
Soga Doteru (6 people outside)