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1. 发明公开

EP3467201A1 METHOD FOR PRODUCING CELLULOSE FINE FIBER 审中-公开
公开(公告)号：EP3467201A1
公开(公告)日：2019-04-10
申请号：EP17806161.0
申请日：2017-03-28
申请人： KRI, Inc.
发明人： LIN Lianzhen , MARUTA Ayako , HORI Masanori
IPC分类号： D21H11/18 , C08B15/08
摘要： Provided is a method of producing cellulose fine fibers that are nanosized, that have a high crystallinity degree, and that are less vulnerable to fiber shape damage, the method including impregnating cellulose with a fibrillation solution containing formic acid to fibrillate the cellulose without vigorous mechanical crushing. Also provided is a method of producing surface-modified cellulose fine fibers including modifying cellulose. The method of producing cellulose fine fibers of the present invention includes impregnating the cellulose with formic acid, a high-concentration formic acid aqueous solution, or a solution containing, in an aprotic solvent having a donor number of 26 or more, formic acid or a high-concentration formic acid aqueous solution serving as a fibrillation solution to fibrillate the cellulose. In addition, the method of producing surface-modified cellulose fine fibers of the present invention has a feature in that: the fibrillation solution further contains a modification reaction agent; and the method includes impregnating the cellulose with the fibrillation solution to modify the surfaces of cellulose fine fibers while fibrillating the cellulose.

2. 发明公开

EP3369748A1 MODIFIED CELLULOSE FINE FIBERS AND METHOD FOR PRODUCING SAME 审中-公开
公开(公告)号：EP3369748A1
公开(公告)日：2018-09-05
申请号：EP16859929.8
申请日：2016-10-27
申请人： KRI, Inc.
发明人： LIN Lianzhen , MARUTA Ayako
IPC分类号： C08B3/06 , C08B3/08 , C08B3/10 , C08B3/20
CPC分类号： C08B3/06 , C08B3/08 , C08B3/10 , C08B3/20 , C08J5/24 , C08L1/10 , C08L2205/16
摘要： Modified fine cellulose fibers are produced by impregnating a cellulose with a reactive fibrillation solution or mixture containing a catalyst including a base catalyst or an organic acid catalyst, a monobasic carboxylic anhydride, and an aprotic solvent having a donor number of not less than 26 to esterify and chemically fibrillate the cellulose. This method provides a simple efficient process for producing modified fine cellulose fibers that have a diameter from several nano-meters to submicrometers, a large aspect ratio, a high degree of crystallinity, less damage in the shape or crystalline structure of the fine fibers, a large aspect ratio, and an excellent dispersibility in an organic solvent; The catalyst may contain a pyridine compound. The monobasic carboxylic anhydride may be a C 2-4 aliphatic monocarboxylic anhydride. The resulting modified fine cellulose fibers modified with a monobasic carboxylic anhydride may have a degree of crystallinity of not less than 70%, an average fiber diameter of 20 to 800 nm, and an average fiber length of 1 to 200 µm.

3. 发明公开

EP3569621A1 SULFURIC ACID ESTERIFICATION MODIFIED CELLULOSE NANOFIBERS AND METHOD FOR PRODUCING CELLULOSE NANOFIBERS 审中-实审转让
公开(公告)号：EP3569621A1
公开(公告)日：2019-11-20
申请号：EP18739069.5
申请日：2018-01-16
申请人： KRI, Inc.
发明人： LIN Lianzhen , HORI Masanori , MARUTA Ayako
IPC分类号： C08B5/14 , C08B7/00 , C08B15/00
摘要： The present invention provides novel sulfate ester modified cellulose nanofibers. The cellulose nanofibers are cellulose nanofibers that have an average fiber diameter in the range of 1 nm to 500 nm, and that have sulfate ester modified hydroxyl groups on surfaces of the cellulose nanofibers. The present invention also provides a method of producing cellulose nanofibers that are nanosized, that have a high crystallinity degree, and that have large aspect ratios, the method being a chemical method that does not require any physical pulverization, that is energy-saving, and that can be performed under mild reaction conditions. The present invention also provides a method of producing modified cellulose nanofibers including modifying the surfaces of the cellulose nanofibers through esterification or urethanization. A method of producing cellulose nanofibers of the present invention includes impregnating cellulose with a fibrillation solution containing dimethylsulfoxide, at least one carboxylic acid anhydride selected from acetic anhydride and propionic anhydride, and sulfuric acid to fibrillate the cellulose.

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