Patent ID: 6680069
Filing Date: 2004-01-20
Classification: C08B

Abstract:
A process for manufacturing a low-substituted hydroxypropyl cellulose, comprising:a step for dipping a pulp in an alkaline solution to prepare an alkali cellulose, a step for reacting said alkali cellulose with a hydroxypropylating agent to yield a product in a complete dissolution state thereof, a step for neutralization with an acid to yield a precipitate, a step for washing, a step for drying, and a step for pulverization to yield a powder having a volume-average particle diameter of less than 25 microns which is determined by a dry laser diffraction method, a loose bulk density of 0.29 g/ml or more and less than 0.40 g/ml, and a tapped bulk density of 0.55 g/ml or more.