Title:
METHOD FOR ASSESSING POLYMER AND PROCESS FOR PRODUCING POLYMER
Document Type and Number:
WIPO Patent Application WO/2014/034178
Kind Code:
A1
Abstract:
The present invention provides a method for detecting, easily and simply, iron and other metallic foreign particles which are contained in a polymer. This method comprises: a step for passing a polymer solution through a filter; a step for bringing a color-forming fluid which contains potassium hexacyanoferrate (II), potassium hexacyanoferrate (III) and an acid into contact with the filter; and a step for detecting foreign particles on the basis of the color developed on the filter, and measuring the number and/or sizes of the foreign particles. The pH of the color-forming fluid is 0.40 to +0.75.
Inventors:
KUSANO MAYUMI (JP)
YOSHIDA MASAOMI (JP)
KASAMA SHINYA (JP)
AKITA EIJI (JP)
KITAMURA HIDEKI (JP)
YOSHIDA MASAOMI (JP)
KASAMA SHINYA (JP)
AKITA EIJI (JP)
KITAMURA HIDEKI (JP)
Application Number:
PCT/JP2013/061725
Publication Date:
March 06, 2014
Filing Date:
April 22, 2013
Export Citation:
Assignee:
KUREHA CORP (JP)
International Classes:
G01N31/22; C08J3/00; G01N21/77
Domestic Patent References:
| WO2008066003A1 | 2008-06-05 |
Foreign References:
| JP2006023132A | 2006-01-26 | |||
| JPS641950A | 1989-01-06 | |||
| JP2000074800A | 2000-03-14 | |||
| JP2005221291A | 2005-08-18 | |||
| JPH05172805A | 1993-07-13 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
Patent business corporation Hara [Kenzo] international patent firm (JP)
Patent business corporation Hara [Kenzo] international patent firm (JP)
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