Title:
ビニルピロリドン系重合体溶液とその製造方法、及び、ビニルピロリドン系重合体の取り扱い方法
Document Type and Number:
Japanese Patent JP5268256
Kind Code:
B2
Abstract:
To provide a high concentration solution of a vinylpyrrolidone polymer having a low K value, which can be used in various applications such as medical applications and applications where coloring is problematic. A monomer component essentially containing N-vinylpyrrolidone, hydrogen peroxide, and ammonia are sequentially added to a copper catalyst-containing aqueous solvent and polymerized at 55 to 90° C., and the ammonia is used in an amount of 0.1 to 0.37% by weight based on the N-vinylpyrrolidone. As a result, a 40 to 60% by weight solution of a vinylpyrrolidone polymer having a K value of 60 or less, wherein the solution has: an N-vinylpyrrolidone content of 10 ppm or less relative to the vinylpyrrolidone polymer; an alkanol concentration of 100 ppm or less; and an ignition residue of 0.1% by weight or less, and a 50% by weight solution of the vinylpyrrolidone polymer has a hue (APHA) according to JIS-K3331 of 280 or less.
Inventors:
Takashi Miyai
Yoshitomo Nakata
Yasuhiro Matsuda
Nakajima Mitsuru
Yoshitomo Nakata
Yasuhiro Matsuda
Nakajima Mitsuru
Application Number:
JP2006542449A
Publication Date:
August 21, 2013
Filing Date:
November 04, 2005
Export Citation:
Assignee:
Nippon Shokubai Co., Ltd.
International Classes:
C08F26/10; C08F4/40
Domestic Patent References:
| JP2001226431A | 2001-08-21 | |||
| JP2002121217A | 2002-04-23 | |||
| JP2002155108A | 2002-05-28 | |||
| JP2000204113A | 2000-07-25 | |||
| JPH1171414A | 1999-03-16 | |||
| JP2001226431A | 2001-08-21 | |||
| JP2002121217A | 2002-04-23 |
Attorney, Agent or Firm:
Atomi International Patent Office
Yasuo Yasutomi
Takanori Tamai
Yasuo Yasutomi
Takanori Tamai
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