METHOD FOR PRODUCING MEDIUM-MOLECULAR-WEIGHT POLYALKYLENEOXIDE

Title:

METHOD FOR PRODUCING MEDIUM-MOLECULAR-WEIGHT POLYALKYLENEOXIDE

Document Type and Number:

WIPO Patent Application WO/2013/080888

Kind Code:

A1

Abstract:

Provided is a method for producing medium-molecular-weight polyalkyleneoxide having a viscosity-average molecular weight of 100,000 to 2,500,000, by subjecting polyalkyleneoxide having a viscosity-average molecular weight of 3,000,000 or more to heat treatment at 30 to 70ºC in an aliphatic hydrocarbon solvent having a dissolved oxygen concentration of 0.5 mg/L or more, in the presence of 0.001 to 1 parts by mass of a radical generator with respect to 100 parts by mass of the polyalkyleneoxide, and thereafter adding 0.001 to 5 parts by mass of an antioxidant with respect to 100 parts by mass of the polyalkyleneoxide thereby removing the solvent. According to the method of the present invention, medium-molecular-weight polyalkyleneoxide having a viscosity-average molecular weight of 100,000 to 2,500,000 which has excellent storage stability can be industrially obtained without carrying out a γ-irradiation treatment.

Inventors:

KATOU MAKOTO
IDO TORU
GOTOU MASAHIRO

Application Number:

PCT/JP2012/080337

Publication Date:

June 06, 2013

Filing Date:

November 22, 2012

Export Citation:

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Assignee:

SUMITOMO SEIKA CHEMICALS (JP)

International Classes:

C08G65/10

Foreign References:

JP2002105196A	2002-04-10
JP2002105195A	2002-04-10
JPS5624420A	1981-03-09
JPS55142027A	1980-11-06
JP2011215377A	2011-10-27
US2982742A	1961-05-02
US4200704A	1980-04-29
JPS5624420A	1981-03-09
JPS55142027A	1980-11-06

Other References: