Title:
METHOD FOR OXIDATION OF CELLULOSE AND PROCESS FOR PRODUCTION OF CELLULOSE NANOFIBERS
Document Type and Number:
WIPO Patent Application WO/2011/074301
Kind Code:
A1
Abstract:
Provided is a method for accelerating the oxidation of primary hydroxyl groups of a cellulosic raw material to achieve efficient introduction of carboxyl groups. Also provided is a process by which a cellulose nanofiber dispersion having excellent fluidity, transparency and thermal stability can be efficiently produced with low energy consumption. Such a cellulose nanofiber dispersion can be produced by: oxidizing a cellulosic raw material with a hypohalous acid salt in the presence of (1) an N-oxyl compound and (2) a compound selected from the group consisting of bromides, iodides, and mixtures thereof under the conditions of pH 8-11 to introduce carboxyl groups in an amount of 1.0mmol/g or more relative to the absolute dry mass of the cellulosic raw material; subjecting the oxidized cellulosic raw material thus obtained to further oxidation with a halous acid salt under the conditions of pH 4-6; and then subjecting the resulting oxidized cellulosic raw material to fibrillation/ dispersion treatment to form a cellulose nanofiber dispersion.
Inventors:
MIYAWAKI SHOICHI (JP)
KATSUKAWA SHIHO (JP)
ABE HIROSHI (JP)
IIJIMA YUKO (JP)
ISOGAI AKIRA (JP)
KATSUKAWA SHIHO (JP)
ABE HIROSHI (JP)
IIJIMA YUKO (JP)
ISOGAI AKIRA (JP)
Application Number:
PCT/JP2010/066437
Publication Date:
June 23, 2011
Filing Date:
September 22, 2010
Export Citation:
Assignee:
JUJO PAPER CO LTD (JP)
MIYAWAKI SHOICHI (JP)
KATSUKAWA SHIHO (JP)
ABE HIROSHI (JP)
IIJIMA YUKO (JP)
ISOGAI AKIRA (JP)
MIYAWAKI SHOICHI (JP)
KATSUKAWA SHIHO (JP)
ABE HIROSHI (JP)
IIJIMA YUKO (JP)
ISOGAI AKIRA (JP)
International Classes:
C08B15/04; D21H11/16
Domestic Patent References:
| WO2009069641A1 | 2009-06-04 |
Foreign References:
| JP2008001728A | 2008-01-10 | |||
| JP2009209217A | 2009-09-17 | |||
| JP2003073402A | 2003-03-12 | |||
| JP2003089701A | 2003-03-28 | |||
| JP2003512540A | 2003-04-02 | |||
| JPH10251302A | 1998-09-22 | |||
| JP2005015680A | 2005-01-20 | |||
| JP2008308802A | 2008-12-25 | |||
| JP2009209218A | 2009-09-17 |
Other References:
ANONYMOUS, CELLULOSE NO JITEN, 10 November 2000 (2000-11-10), ASAKURA PUBLISHING CO., LTD.,, pages 153 - 156
TSUGUYUKI SAITO ET AL.: "Homogeneous Suspensions of Individualized Microfibrils from TEMPO-Catalyzed Oxidation of Native Cellulose", BIOMACROMOLECULES, vol. 7, no. 6, 2006, pages 1687 - 1691, XP003024256, DOI: doi:10.1021/BM060154S
T. SAITO ET AL.: "TEMPO-mediated oxidation of native cellulose: Microscopic analysis of fibrous fractions in the oxidized products", CARBOHYDRATE POLYMERS, vol. 65, no. 4, 2006, pages 435 - 440, XP025087821, DOI: doi:10.1016/j.carbpol.2006.01.034
TSUGUYUKI SAITO ET AL.: "Individualization of Nano-Sized Plant Cellulose Fibrils by Direct Surface Carboxylation Using TEMPO Catalyst under Neutral Conditions", BIOMACROMOLECULES, vol. 10, no. 7, July 2009 (2009-07-01), pages 1992 - 1996, XP055130864, DOI: doi:10.1021/bm900414t
TSUGUYUKI SAITO ET AL.: "Homogeneous Suspensions of Individualized Microfibrils from TEMPO-Catalyzed Oxidation of Native Cellulose", BIOMACROMOLECULES, vol. 7, no. 6, 2006, pages 1687 - 1691, XP003024256, DOI: doi:10.1021/BM060154S
T. SAITO ET AL.: "TEMPO-mediated oxidation of native cellulose: Microscopic analysis of fibrous fractions in the oxidized products", CARBOHYDRATE POLYMERS, vol. 65, no. 4, 2006, pages 435 - 440, XP025087821, DOI: doi:10.1016/j.carbpol.2006.01.034
TSUGUYUKI SAITO ET AL.: "Individualization of Nano-Sized Plant Cellulose Fibrils by Direct Surface Carboxylation Using TEMPO Catalyst under Neutral Conditions", BIOMACROMOLECULES, vol. 10, no. 7, July 2009 (2009-07-01), pages 1992 - 1996, XP055130864, DOI: doi:10.1021/bm900414t
Attorney, Agent or Firm:
ONO, Shinjiro et al. (JP)
Ono Shinjiro (JP)
Ono Shinjiro (JP)
Download PDF:
Previous Patent: LIQUID CRYSTAL DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY DEVICE
Next Patent: CONTROL DEVICE FOR INTERNAL-COMBUSTION ENGINE
Next Patent: CONTROL DEVICE FOR INTERNAL-COMBUSTION ENGINE