PROCESS FOR PRODUCTION OF OXYMETHYLENE COPOLYMERS

Title:

PROCESS FOR PRODUCTION OF OXYMETHYLENE COPOLYMERS

Document Type and Number:

WIPO Patent Application WO/2008/018414

Kind Code:

A1

Abstract:

A process for the production of oxymethylene copolymers which comprises the step of polymerizing (A) trioxane with (B) a cyclic ether having at least one carbon-carbon bond in the cyclic structure and/or a cyclic formal continuously by using a cationic polymerization catalyst in a polymerization system, wherein (C) a glycidyl compound and/or an alcohol is intermittently fed to either a raw material for polymerization containing at least either of the components (A) and (B) or the above polymerization system by the early stage of the polymerization at the latest under the following conditions (1), (2) and (3): (1) the ratio (t/T) of the feed time (t) of the component (C) fed intermittently to the feed time (T) of the component (A) fed to the polymerization system is 1/600 to 1/6; (2) the feed of the component (C) in the feed time (t) is 0.4 to 50mmol per mol of the component (A); and (3) the total feed of the component (C) is 0.0004 to 0.5mmol per mol of the component (A).

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Inventors:

OKAMURA AKIRA (JP)
NAGAI SATOSHI (JP)

Application Number:

PCT/JP2007/065379

Publication Date:

February 14, 2008

Filing Date:

August 06, 2007

Export Citation:

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Assignee:

MITSUBISHI GAS CHEMICAL CO (JP)
OKAMURA AKIRA (JP)
NAGAI SATOSHI (JP)

International Classes:

C08G2/22

Foreign References:

JPH075694B2	1995-01-25
JPS5519942B1	1980-05-29
JP2001240639A	2001-09-04
JP2003342442A	2003-12-03
JPS5519942B1	1980-05-29
JPH075694B2	1995-01-25
JP2928823B2	1999-08-03

Other References: