Patent ID: 8597686

Claim:
A porous cellulose aggregate having a secondary aggregate structure formed by aggregation of primary cellulose particles consisting of cellulose dispersion particle groups (A) and (B), wherein the cellulose dispersion particle group (A) has an average particle size of 10-110 μm and a shape with a ratio (L/D) of 2.0 or more, where L is an average length of a major diameter of the cellulose particles and D is an average length of a minor diameter of the cellulose particles, the cellulose dispersion particle group (B) has an average particle size of 0.01-0.7 times the average particle size of the cellulose dispersion particle group (A), and a weight ratio of (A):(B) is from about 5:95 to about 95:5, the aggregate having a pore volume within a particle of 0.265 cm 3 /g to 2.625 cm 3 /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 1.3-12.5 m 2 /g, a repose angle of 25° or more and less than 44° and properties to disintegrate in water.