Cellulose powder
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsKazuhiro Obae, Etsuo Kamada, Yohsuke Honda, Shun'ichi Gomi, Naoaki Yamazaki
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Abstract
Cellulose powder having an especially excellent balance among moldability, fluidity and disintegrating property is provided. Cellulose powder having an average polymerization degree of 150-450, an average L/D (the ratio of the major axis to the minor axis) value of particles of 75 μm or less of 2.0-4.5, an average particle size of 20-250 μm, an apparent specific volume of 4.0-7.0 cm3/g, an apparent tapping specific volume of 2.4-4.5 cm3/g, and an angle of repose of 55° or less.
Claims15
A cellulose powder having an average polymerization degree of 150-450, an average L/D value of particles of 2.0-4.5 for 75 μm or less, an average particle size of 20-105 μm, an apparent specific volume of 4.0-7.0 cm3/g, an apparent tapping specific volume of 2.4-4.5 cm3/g, an angle of repose of 52° or less, and a specific surface area of 85 m2/g or more as measured by water vapor adsorption, wherein the average polymerization degree of said powder is 5 to 300 higher than the level-off polymerization degree for said cellulose powder, said level-off polymerization degree being measured by a viscosity method after hydrolysis of the cellulose powder in boiling 2.5N hydrochloric acid for 15 minutes, wherein the breaking load of tablets obtained by compressing 0.5 g of the cellulose powder at 20 MPa is 190 N or more and the disintegration time of the tablets is 130 seconds or less.
Dependencies are inferred from the claim text.