Patent ID: 8221789
Filing Date: 2012-07-17
Classification: A61K,C08B,Y10T

Abstract:
1. A process for producing cellulose powder, comprising: i) hydrolyzing a cellulosic material in aqueous medium with a solution-stirring force of 0.01 to 10,000 P/V; to obtain a cellulose dispersion; ii) spray-drying the cellulose dispersion at an exhaust temperature of less than 100° C., to produce a cellulose powder having the following characteristics: a) an average polymerization degree of 150-450, which is 5 to 300 higher than the level-off polymerization degree for the 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; b) an average L/D value for particles that pass through a 75 μm screen and remain on a 38 μm screen before spray drying is 3.0-5.5, and c) an angle of repose that is 55° or less.