US 12,454,582 B2
Nanofibrillated cellulose fibers
Jian Qin, Appleton, WI (US); Donald E. Waldroup, Roswell, GA (US); Youquan Su, Shanghai (CN); and Liyi Shi, Shanghai (CN)
Assigned to Kimberly-Clark Worldwide, Inc., Neenah, WI (US)
Filed by Kimberly-Clark Worldwide, Inc., Neenah, WI (US); and Shanghai University, Shanghai (CN)
Filed on Mar. 9, 2023, as Appl. No. 18/180,900.
Application 18/180,900 is a division of application No. 16/642,665, abandoned, previously published as PCT/CN2017/099890, filed on Aug. 31, 2017.
Prior Publication US 2023/0220119 A1, Jul. 13, 2023
Int. Cl. C08B 15/05 (2006.01); D06M 10/06 (2006.01); F26B 3/12 (2006.01); D06M 101/06 (2006.01)
CPC C08B 15/05 (2013.01) [D06M 10/06 (2013.01); F26B 3/12 (2013.01); D06M 2101/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for preparing a spray dried non-hydrogen bonded (NHB) nano-fibrillated cellulose (NFC) composition comprising:
treating a cellulose fiber with a weight % of at least about 1% or higher in water slurry with a soda based alkali under a combination of temperature and pressure, wherein the temperature and pressure comprises a temperature of about 140 to 150° C.;
neutralizing the treated cellulose fiber with an acid after treating the cellulose fiber with the soda based alkali slurry such that gas bubbles form within the cellulose fiber;
homogenizing or ultrasonic treating the pre-treated cellulose fiber to form a NFC slurry;
dewatering the NFC slurry by a centrifugal machine to achieve a solid level at a weight % of at least about 10 or higher;
mixing the treated NFC slurry with alcohol at a ratio of 1 part NFC to 30 parts alcohol;
reacting the treated NFC slurry with a reagent having a general formula (I) or (II) at an elevated temperature at least about 20° C. or higher for at least 30 minutes, wherein reacting comprises heating the treated NFC slurry to the elevated temperature for the at least 30 minutes

OG Complex Work Unit Chemistry
wherein R1 equals a carbon containing alkane group;
wherein X1, Y1, Z1 are alkoxy groups, whereby these groups may be the same or different; or

OG Complex Work Unit Chemistry
wherein R2 equals a carbon containing alkane group;
W is either oxygen (O) or nitrogen (N) atom;
R3 equals a carbon containing alkane group;
X2, Y2, Z2 equal alkoxy groups, wherein these groups may be the same or different;
and thereafter drying the NFC slurry with a spray drying equipment.