METHOD FOR PRODUCING POLYACETAL COPOLYMER

Title:

METHOD FOR PRODUCING POLYACETAL COPOLYMER

Document Type and Number:

WIPO Patent Application WO/2015/151343

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide a high-quality polyacetal copolymer economically advantageously by a simple process. The present invention comprises: a raw material supply step (S1) of supplying a raw material comprising trioxane, a comonomer capable of copolymerizing with trioxane and a non-volatile protonic acid to a reactor of a continuous stirring/mixing machine type; a polymerization reaction step (S2) of carrying out a polymerization reaction of the raw material to produce a reaction mixture; an unreacted monomer re-supply step (S3) of vaporizing an unreacted monomer to separate the unreacted monomer from the reaction mixture and supplying the unreacted monomer to the raw material supply step; a polyacetal copolymer collection step (S4) of collecting a polyacetal copolymer from the reaction mixture into a collection unit which is arranged downstream from a discharge port and is so adjusted as to have a gauge pressure of 0.2 kPa or more; and a deactivation step (S5) of adding a basic compound to the polyacetal copolymer that has been collected in the polyacetal copolymer collection step and then subjecting the resultant mixture to a melt-kneading treatment to deactivate the non-volatile protonic acid.

Inventors:

NAKAO HIROAKI (JP)
MASUDA EIJI (JP)

Application Number:

PCT/JP2014/082631

Publication Date:

October 08, 2015

Filing Date:

December 10, 2014

Export Citation:

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Assignee:

POLYPLASTICS CO (JP)

International Classes:

C08G2/28

Domestic Patent References:

WO1996013534A1

1996-05-09

Foreign References:

JPH09278852A	1997-10-28
JPH03128911A	1991-05-31
JP2009249451A	2009-10-29
JP2009248441A	2009-10-29
JPH0859767A	1996-03-05
JPH05247158A	1993-09-24
JPH05247157A	1993-09-24
JPS62119219A	1987-05-30

Other References: