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Title:
POLYVINYLPYRROLIDONE POWDER COMPOSITION
Document Type and Number:
Japanese Patent JP2008202035
Kind Code:
A
Abstract:

To provide a polyvinylpyrrolidone powder composition with a low content of insoluble matters and/or a high thermal stability.

The polyvinylpyrrolidone powder composition contains polyvinylpyrrolidone having a K value of 50 or higher and 120 or lower. The first patent claim explains that when a 2 wt.% aqueous solution of the composition is filtered with a membrane filter having a pore size of 1.2 m, the content of insoluble substances remaining on the filter is 70 ppm or lower. The second patent claim explains that when the composition is heated at 80C in air for 14 days, the lowering ratio of observed K value is 12% or lower. The third patent claim explains that when a 2 wt.% aqueous solution of the composition is filtered with a membrane filter having a pore size of 1.2 m, the content of insoluble substances remaining on the filter is 70 ppm or lower and when the composition is heated at 80C in air for 14 days, the lowering ratio of observed K value is 12% or lower.


Inventors:
OKAMURA KAZUHIRO
Application Number:
JP2008008216A
Publication Date:
September 04, 2008
Filing Date:
January 17, 2008
Export Citation:
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Assignee:
NIPPON CATALYTIC CHEM IND
International Classes:
C08J3/12; C08K5/17; C08L39/06
Domestic Patent References:
JP2006273937A2006-10-12
JP2001002880A2001-01-09
JP2003138087A2003-05-14
JP2007092029A2007-04-12
JP2007277378A2007-10-25
JP2006273937A2006-10-12
JP2001002880A2001-01-09
JP2003138087A2003-05-14
JP2007092029A2007-04-12
JP2007277378A2007-10-25
Attorney, Agent or Firm:
Kyuichi Ueki
Tadashi Sugakawa
Osamu Futakuchi
Hiroaki Ito



 
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