Title:
METHOD FOR PRODUCING CARBAMATED CELLULOSE FIBERS AND METHOD FOR PRODUCING CARBAMATED CELLULOSE FINE FIBERS
Document Type and Number:
WIPO Patent Application WO/2023/238458
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing carbamated cellulose fibers or carbamated cellulose fine fibers with a high degree of whiteness without impairing the reinforcing effect of a resin. [Solution] A bleaching agent is added to carbamated cellulose fibers and bleaching is performed under conditions in which the reaction temperature is 90 degrees or less and the pH is 7 or less. In addition, carbamated cellulose fibers obtained by this method and having a carbamate group introduction amount of 0.5 mmol/g or more are subjected to nanofibrillation, and this nanofibrillation is performed so as to obtain an average fiber width of 0.1-20 μm, an average fiber length of 0.1-2.0 mm, and a fine ratio A of 10%-90%.
Inventors:
AOKI RYUNOSUKE (JP)
MATSUSUE IKKO (JP)
IMAI TAKAAKI (JP)
MATSUSUE IKKO (JP)
IMAI TAKAAKI (JP)
Application Number:
PCT/JP2023/007627
Publication Date:
December 14, 2023
Filing Date:
March 01, 2023
Export Citation:
Assignee:
DAIO SEISHI KK (JP)
International Classes:
D06L4/13; C08B15/06; D06M11/50; D21H11/18; D21H11/20; D21H15/02; D06M101/08
Domestic Patent References:
| WO2012175815A1 | 2012-12-27 | |||
| WO2022091580A1 | 2022-05-05 | |||
| WO2021251215A1 | 2021-12-16 |
Foreign References:
| JP2023047589A | 2023-04-06 |
Other References:
WEI YUJUN, ZHOU MI, YAO ANRONG, ZHU PUXIN: "Preparation of Microfibrillated Cellulose from Wood Pulp through Carbamate Modification and Colloid Milling", APPLIED SCIENCES, MDPI SWITZERLAND, vol. 10, no. 6, 13 March 2020 (2020-03-13), pages 1977, XP093113027, ISSN: 2076-3417, DOI: 10.3390/app10061977
Attorney, Agent or Firm:
NAGAI INTERNATIONAL PATENT BUREAU (JP)
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