Title:
PROCESS FOR PRODUCING ACETAL COPOLYMER
Document Type and Number:
WIPO Patent Application WO/1995/023171
Kind Code:
A1
Abstract:
A process for producing an acetal copolymer by copolymerizing trioxane with a cyclic ether copolymerizable therewith, wherein the cyclic ether is a mixture of a fresh cyclic ether wherein the content of a peroxide derived therefrom is at most 15 wt. ppm in terms of hydrogen peroxide and at least one sterically hindered phenol added in a quantity of 10-500 wt. ppm based on the ether. This process enables a highly heat-stable acetal copolymer to be produced in a stabilized manner, and also enables deactivation of the catalyst and stabilization of the unstable polymer ends to be effected in a stabilized manner after the copolymerization.
Inventors:
YAHIRO SHYUZI (JP)
YAMAMOTO MINORU (JP)
YAMAMOTO MINORU (JP)
Application Number:
PCT/JP1995/000306
Publication Date:
August 31, 1995
Filing Date:
February 28, 1995
Export Citation:
Assignee:
ASAHI CHEMICAL IND (JP)
YAHIRO SHYUZI (JP)
YAMAMOTO MINORU (JP)
YAHIRO SHYUZI (JP)
YAMAMOTO MINORU (JP)
International Classes:
C08G2/18; C08G4/00; (IPC1-7): C08G2/18
Foreign References:
| JPS59227916A | 1984-12-21 | |||
| JPS601216A | 1985-01-07 |
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