Title:
PREPARATION OF HIGH-MOLECULAR-WEIGHT POLYETHER POLYESTER
Document Type and Number:
Japanese Patent JP3084353
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prepare a polyether polyester having excellent mechanical strengths by reacting a polyalkylene oxide with a polybasic acid anhydride in the presence of at least one neutralizing agent selected from among metal compounds, simple metals, ammonia and amines.
SOLUTION: One mol of a low-molecular-weight polyalkylene oxide (e.g. polyethylene glycol), about 0.1-4.0mol of a polybasic acid anhydride (e.g. pyromellitic dianhydride) and about 0.001-10.0mol, per mol of the anhydride, of at least one neutralizing agent selected from among metal compounds, simple metals, ammonia and amines (e.g. Cu, CaCO3 or triethylamine) are fed into, e.g. a kneader for high viscosity use. Next, the mixture is kneaded and reacted by heating to about 70-300°C, especially about 90-180°C to form a high-molecular- weight polyether polyester having a number-average molecular weight of about 50,000-1,000,000. This polyester is extruded to obtain a film having a tensile strength of about 30kgf/cm2 or above, an elongation of about 200% or above, and a thickness of about 10-300μm.
Inventors:
Terunori Matsushita
Hiroshi Ito
Hiroya Kobayashi
Hiroshi Ito
Hiroya Kobayashi
Application Number:
JP1652796A
Publication Date:
September 04, 2000
Filing Date:
February 01, 1996
Export Citation:
Assignee:
Nippon Shokubai Co., Ltd.
International Classes:
C08G65/32; C08G63/668; C08J5/18; (IPC1-7): C08G63/668; C08J5/18
Domestic Patent References:
| JP7324125A | ||||
| JP55031A | ||||
| JP4356526A | ||||
| JP49129795A |