METHOD FOR PRODUCING OXYMETHYLENE COPOLYMER - MITSUBISHI GAS CHEMICAL CO

Title:

METHOD FOR PRODUCING OXYMETHYLENE COPOLYMER

Document Type and Number:

WIPO Patent Application WO/2014/189139

Kind Code:

A1

Abstract:

Provided is a method for producing an oxymethylene copolymer having excellent extrusion moldability and reduced voids in a molded article without lowering the inherent performance of an oxymethylene copolymer. Provided is a method for producing an oxymethylene copolymer, including: a step for copolymerizing a monomer raw material containing trioxane and 5-7 mass% of 1,3-dioxolane relative to the trioxane, in the presence of 0.025-0.07 mmol of boron trifluoride per mol of trioxane and 0.006-2.0 mass% of sterically hindered phenol relative to the trioxane; a step for adding a polymerization terminator to the reaction system when the polymerization yield of this copolymer has reached 92% or higher, and terminating polymerization; and a thermal stabilization step for heating and melting the crude oxymethylene copolymer in the presence of 0.05-5 mass% of an antioxidant and 0.005-5 mass% of a nitrogen-containing compound relative to the crude oxymethylene copolymer.

More Like This:

JPS5915332	[Title of the Invention] Polya Seta-Le polymer
WO/2023/171315	METHOD FOR PRODUCING POLYACETAL COPOLYMER

Inventors:

ITO AKIRA (JP)
MIKAMI SUNAO (JP)

Application Number:

PCT/JP2014/063733

Publication Date:

November 27, 2014

Filing Date:

May 23, 2014

Export Citation:

Click for automatic bibliography generation Help

Assignee:

MITSUBISHI GAS CHEMICAL CO (JP)

International Classes:

C08G2/04; C08G2/06; C08G2/10

Domestic Patent References:

WO2002077049A1

2002-10-03

Foreign References:

JPH0363965B2	1991-10-03
JPH08325341A	1996-12-10
JPH0363965B2	1991-10-03
JPH07242652A	1995-09-19
JPH01269165A	1989-10-26
JPH06212054A	1994-08-02
JPH07207117A	1995-08-08
JPH07292216A	1995-11-07
JPH0967503A	1997-03-11
JPH0952926A	1997-02-25
JP2003064141A	2003-03-05

Other References: