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Title:
METHOD FOR PRODUCING POLYOXYMETHYLENE RESIN COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2015/075999
Kind Code:
A1
Abstract:
Provided is a polyoxymethylene resin composition from which formaldehyde is generated in a sufficiently reduced amount upon molding, without carrying out a stabilization treatment for stabilizing an unstable terminal group in a crude oxymethylene copolymer. In the present invention, a hindered phenol-type antioxidant agent and an ethylene-(methacrylic acid) copolymer resin or an ethylene-(acrylic acid) copolymer resin or a salt thereof are melted and kneaded together to produce a polyoxymethylene resin composition without carrying out a stabilization treatment for stabilizing an unstable terminal group in a crude oxymethylene copolymer for which a polymerization catalyst is deactivated after the completion of copolymerization and in which the unstable terminal group is not stabilized yet. When the polyoxymethylene resin composition is extrusion-molded, the discoloration of a molded product or the deterioration in properties of the molded product can be prevented for a long period. Therefore, the polyoxymethylene resin composition produced in the present invention is suitable for forming an extrusion-molded article.

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Inventors:
MONMA TOMOHIRO (JP)
WATANABE KAZUFUMI (JP)
SHIMODA AKIHIDE (JP)
Application Number:
PCT/JP2014/073802
Publication Date:
May 28, 2015
Filing Date:
September 09, 2014
Export Citation:
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Assignee:
POLYPLASTICS CO (JP)
International Classes:
C08K5/098; C08L59/02; C08K5/13; C08L23/08; C08L23/26
Foreign References:
JP2000239484A2000-09-05
JP2000017144A2000-01-18
JP2000017143A2000-01-18
JPS61145245A1986-07-02
JP2010037445A2010-02-18
JP2008001850A2008-01-10
JP2008031348A2008-02-14
JP2007332227A2007-12-27
JP2007112959A2007-05-10
JP2001011143A2001-01-16
Other References:
See also references of EP 3072927A4
Attorney, Agent or Firm:
SHOBAYASHI, Masayuki et al. (JP)
Right wood Masayuki (JP)
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