Title:
超吸収性ポリマーの製造方法
Document Type and Number:
Japanese Patent JP2013523924
Kind Code:
A
Abstract:
The present invention relates to a continuous or batch process for the preparation of a super-absorbent polymer comprising:
a) subjecting an aqueous monomer mixture containing
- at least one ±,²-ethylenically unsaturated monomer;
- at least one monomer bearing at least two ±,²-ethylenically unsaturated groups;
- iron ions in an amount of 0.1 to 3 wppm based on the total weight of the aqueous monomer mixture; and
- at least one chelating agent in an amount to provide a mol ratio of chelating agent to iron ion of 0.8 to 4.0
to free radical polymerization in an reactor to obtain a super-absorbent polymer; and
b) recovering the super-absorbent polymer,
whereby if the process is continuous and is run in an agitated reactor the upper limit of the mol ratio of chelating agent to iron ion is
- 4.0 for a throughput of total reaction mixture through the reactor of at most 1.3 kg/h per liter reactor volume,
- 3.5 for a throughput of total reaction mixture through the reactor of more than 1.3 kg/h per liter reactor volume at most 2.5 kg/h per liter reactor volume, and
- 1.5 for a throughput of total reaction mixture through the reactor of more than 2.5 kg/h per liter reactor volume.
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Inventors:
Gartoner Herbert
Harlen ielck
Hagel Marc
Pleating gel halalt
Frickel Dyer
Corel Hans-Peter
Auernick Sabin
Harlen ielck
Hagel Marc
Pleating gel halalt
Frickel Dyer
Corel Hans-Peter
Auernick Sabin
Application Number:
JP2013501707A
Publication Date:
June 17, 2013
Filing Date:
March 01, 2011
Export Citation:
Assignee:
Evonik Degussa GmbH
International Classes:
C08F2/38; C08F2/01; C08J3/12; C08J3/24
Domestic Patent References:
| JP2000038407A | 2000-02-08 | |||
| JP2005502745A | 2005-01-27 | |||
| JP2009507119A | 2009-02-19 | |||
| JP2008255366A | 2008-10-23 | |||
| JP2005530906A | 2005-10-13 | |||
| JP2003261601A | 2003-09-19 | |||
| JPH08283318A | 1996-10-29 | |||
| JP2006219661A | 2006-08-24 | |||
| JPH05320205A | 1993-12-03 |
Attorney, Agent or Firm:
Kenji Akatsuka
Yasuo Fukuda
Yasuyuki Sakata
Ken Shibuya
Yasuo Fukuda
Yasuyuki Sakata
Ken Shibuya