Title:
PRODUCTION OF POLYOXYMETHYLENE COPOLYMER
Document Type and Number:
Japanese Patent JPH05247157
Kind Code:
A
Abstract:
PURPOSE:To produce a polyoxymethylene copolymer having improved thermal stability in high efficiency. CONSTITUTION:A polyoxymethylene copolymer is produced by using trioxane as main monomer and a cyclic ether or cyclic formal as a comonomer and copolymerizing the monomers in the presence of a catalyst composed of boron trifluoride or its coordination compound. In the above process, the total amount of impurities to form unstable terminals in the reaction system is suppressed to <=1X10<-2>mol% based on the total monomer, the amount of the catalyst for the polymerization reaction is adjusted to 1X10<-3> to 1X10<-2>mol% based on the total monomer and the copolymerization product is cooled to <=45 deg.C within 30sec after the copolymerization to inactivate the catalyst.
Inventors:
YAMAMOTO KAORU
MAEDA EIKICHI
KAMIYA MAKOTO
MURAO TOSHIRO
MAEDA EIKICHI
KAMIYA MAKOTO
MURAO TOSHIRO
Application Number:
JP4947692A
Publication Date:
September 24, 1993
Filing Date:
March 06, 1992
Export Citation:
Assignee:
POLYPLASTICS CO
International Classes:
C08G2/18; C08G2/06; (IPC1-7): C08G2/18
Domestic Patent References:
| JP42024188A | ||||
| JP43015990A | ||||
| JP43026871A | ||||
| JP44006277A | ||||
| JP44011384A | ||||
| JP44020996A | ||||
| JP45006278A |
Attorney, Agent or Firm:
Kaoru Furuya (3 outside)