Porous cellulose aggregate and molding composition thereof
AssigneeAsahi Kasei Chemicals Corporation
InventorsKazuhiro Obae, Hideki Amakawa, Ichiro Ibuki
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Abstract
A porous cellulose aggregate characterized by having a secondary aggregate structure resulting from aggregation of primary cellulose particles, having a pore volume within a particle of 0.265 to 2.625 cm3/g, containing I-type crystals and having an average particle size of over 30 to 250 μm, a specific surface area of 0.1 to less than 20 m2/g, a repose angle of 25° to less than 44° and a swelling degree of 5% or more, and characterized by having the property of disintegrating in water.
Claims17
A method for producing a porous cellulose aggregate having an aggregate structure formed by aggregation of primary cellulose particles, having a pore volume within a particle of 0.265 cm3/g-2.625 cm3/g, containing type I crystals, and having an average particle size of more than 30 μm and 250 μm or less, a specific surface area of 0.1 m2/g or more and less than 20 m2/g, a repose angle of 25° or more and less than 44°, a swelling degree of 5% or more, and properties to disintegrate in water, the method comprising:
- a step of obtaining a dispersion (hereinafter may also be designated as a cellulose dispersion) containing water and a natural cellulose material in which primary cellulose particles have an average particle size of 10 μm or larger and less than 50 μm, average width of 2-30 μm and average thickness of 0.5-5 μm, and
- a step of drying thus obtained cellulose dispersion.
Dependencies are inferred from the claim text.