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Title:
VINYLPYRROLIDONE POLYMER SOLUTION, PROCESS FOR PRODUCING THE SAME, AND METHOD OF HANDLING VINYLPYRROLIDONE POLYMER
Document Type and Number:
WIPO Patent Application WO/2006/049257
Kind Code:
A1
Abstract:
A high-concentration solution of a vinylpyrrolidone polymer having a low K value. It is usable in all applications including medical applications and applications where coloration is problematic. A monomer ingredient comprising N-vinylpyrrolidone as an essential ingredient, hydrogen peroxide, and ammonia are successively added to an aqueous solvent containing a copper catalyst and are polymerized at 55-90°C. The ammonia is used in an amount of 0.1-0.37 wt.% based on the N-vinylpyrrolidone. Thus, a solution of a vinylpyrrolidone polymer having a K value of 60 or smaller is obtained which has a concentration of the polymer of 40-60 wt.%. The solution has an N-vinylpyrrolidone content not higher than 10 ppm of the vinylpyrrolidone polymer, an alkanol concentration of 100 ppm or lower, and an ignition residue amount of 0.1 wt.% or smaller. A 50 wt.% solution of the vinylpyrrolidone polymer has a hue of 280 or less.

Inventors:
Miyai, Takashi (5-1-104, Nishimachi Takatsuki-sh, Osaka 54, 56908, JP)
Nakata, Yoshitomo (3-2 Koshiencho, Nishinomiya-shi Hyogo, 52, 66381, JP)
Matsuda, Yasuhiro (33-10, Mizonokuchi Kakogawacho, Kakogawa-sh, Hyogo 64, 67500, JP)
Nakajima, Mitsuru (5-3-404, Nishimachi Takatsuki-sh, Osaka 54, 56908, JP)
Application Number:
PCT/JP2005/020313
Publication Date:
May 11, 2006
Filing Date:
November 04, 2005
Export Citation:
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Assignee:
NIPPON SHOKUBAI CO., LTD. (1-1 Koraibashi 4-chome, Chuo-ku Osaka-sh, Osaka 43, 54100, JP)
Miyai, Takashi (5-1-104, Nishimachi Takatsuki-sh, Osaka 54, 56908, JP)
Nakata, Yoshitomo (3-2 Koshiencho, Nishinomiya-shi Hyogo, 52, 66381, JP)
Matsuda, Yasuhiro (33-10, Mizonokuchi Kakogawacho, Kakogawa-sh, Hyogo 64, 67500, JP)
Nakajima, Mitsuru (5-3-404, Nishimachi Takatsuki-sh, Osaka 54, 56908, JP)
International Classes:
C08F26/10
Foreign References:
JP2003292537A
JPS6262804A
JP2002155108A
JPS5975911A
JPH1171414A
JP2002069115A
JP2001131233A
Attorney, Agent or Firm:
Yasutomi, Yasuo (Chuo BLDG, 4-20 Nishinakajima 5-chome, Yodogawa-k, Osaka-shi Osaka, 532-0011, JP)
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