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US 9,592,199 B2Granted
Cellulose powder
AssigneeAsahi Kasei Chemicals Corporation
InventorsKazuhiro Obae, Masayuki Kakizawa, Mitsuo Yamashita, Shinji Matsui
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Abstract
This cellulose powder has: an average degree of polymerization of 100 to 350; a weight average particle size of over 30 μm, but less than 250 μm; an apparent specific volume of 2 to less than 15 cm3/g; and a particle size distribution sharpness of 1.5 to 2.9.
Claims14
A cellulose powder having:
- an average degree of polymerization of 100 to 350,
- a weight average particle size of more than 30 μm and 250 μm or less,
- an apparent specific volume of 2 to less than 15 cm3/g,
- a sharpness of particle size distribution of 1.5 to 2.9, and
- an angle of repose of 36° or more and less than 44°.
2 more elements
A method of preparing a cellulose powder, comprising:
- hydrolyzing a natural cellulose substance at a hydrochloric acid concentration of 0.05 to 0.3% at a hydrolysis temperature of 100 to 150° C. for a hydrolysis time of 40 to 110 minutes to control a volume average particle size of particles in a cellulose dispersion liquid after the hydrolysis to be 70 to 150 μm, and then
- spray drying the resulting dispersion liquid to prepare a cellulose powder having:
- an average degree of polymerization of 100 to 350,
- a weight average particle size of the cellulose powder of more than 30 μm and 250 μm or less,
- an apparent specific volume of 2 to 15 cm3/g,
- a sharpness of particle size distribution of 1.5 to 2.9, and
- an angle of repose of 36° or more and less than 44°.
4 more elements
A molded article comprising:
- one or more active ingredients, one or more additives selected from saccharides, sugar alcohols, starches, and disintegrating agents, and a cellulose powder,
- wherein the molded article has a hardness of 50 to 200 N, a tensile strength of 0.1 to 12 MPa, a friability of 0 to 0.5%, a swelling rate of a diameter of the molded article in acetone of 0 to 3.3% or less, and a disintegration time of 20 minutes or less, and
- wherein the cellulose powder has:
- an average degree of polymerization of 100 to 350,
- a weight average particle size of more than 30 μm and 250 μm or less,
- an apparent specific volume of 2 to less than 15 cm3/g,
- a sharpness of particle size distribution of 1.5 to 2.9, and
- an angle of repose of 36° or more and less than 44°.
5 more elements
Dependencies are inferred from the claim text.