Method for producing nanofibrillar cellulose
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United States of America Patent
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Sep 5, 2017
Grant Date -
Oct 22, 2015
app pub date -
Nov 1, 2013
filing date -
Nov 3, 2012
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Abstract
In a method for preparing nanofibrillar cellulose, fibrous dispersion of ionically charged cellulose is repeatedly passed through a mechanical process of disrupting fibers into fibrils until the viscosity starts to decrease. The number average diameter of the nanofibrillar cellulose after the mechanical process is in the range of 2-10 nm, and the zero-shear viscosity is below 10 Pa·s, preferably below 1 Pa·s, when measured in the concentration of 0.5 wt-%. The nanofibrillated cellulose is low aspect ratio nanofibrillated cellulose (NFC-L).
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