Patent ID: 9334416
Filing Date: 2016-05-10
CPC Classification: A61K,C08B,C08J,C09D

Claim Text:
1. A process for producing a particulate cellulose derivative comprising the steps of A) providing a moist cellulose derivative having a moisture content of from 25 to 95 percent, based on the total weight of the moist cellulose derivative, with the proviso that no substantial amount of a surface-treatment additive is added to the cellulose derivative, B) grinding and partially drying the moist cellulose derivative in a gas-swept impact mill wherein a gas fed into the impact mill has a temperature of 100° C. or less; and C) contacting the ground and partially dried cellulose derivative with an additional amount of a drying gas outside the gas-swept impact mill, wherein the additional amount of drying gas outside the gas-swept impact mill has a higher temperature than the gas fed into the impact mill to produce the particulate cellulose derivative.