| 摘要 |
PROBLEM TO BE SOLVED: To provide a method which can efficiently produce an amorphous cellulose reduced in the crystallinity of cellulose I type, and is excellent in productivity. SOLUTION: The method for producing an amorphous cellulose comprises cutting a sheet type cellulose-containing raw material, which has a cellulose content of not less than 20 mass% in a residual component of the cellulose-containing raw material after removing water and has over 33% degree of crystallinity of cellulose I defined by the following formula, into pieces having a surface area of 0.01 to 25 cm<SP>2</SP>and a bulk density of 100 to 500 kg/m<SP>3</SP>, drying the obtained cellulose-containing raw material and pulverizing the material by a pulverizing machine to reduce the degree of crystallinity of cellulose I to 33% or lower. The crystallinity of cellulose I type is defined by the formula: the crystallinity (%)=[(I<SB>22.6</SB>-I<SB>18.5</SB>)/I<SB>22.6</SB>]×100, wherein I<SB>22.6</SB>represents the diffraction intensity of a grating plane (002 face) by X-ray diffraction (2θ=22.6°) and I<SB>18.5</SB>represents the diffraction intensity of an amorphous part (2θ=18.5°). COPYRIGHT: (C)2011,JPO&INPIT |
