Grinding process for high viscosity cellulose ethers
AssigneeThe Dow Chemical Company
InventorGary J. Schulz
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Abstract
High viscosity cellulose ether products are produced by grinding a substantially dry high molecular weight cellulose ether under conditions of mild mechanical impact such as those encountered in a high speed air swept impact mill. It has been found that such a cellulose ether product has several times the intrinsic viscosity of a product of substantially equivalent particle size by ball mill or hammer mill grinding.
Claims12
A process of reducing the particle size of a high molecular weight, a high viscosity cellulose ether without substantial change in viscosity, which process comprises grinding a substantially dry, high molecular weight cellulose ether in a high speed air swept impact mill, wherein prior to grinding, the cellulose ether has a viscosity greater than about 100,000 cps at 20.degree. C.
Dependencies are inferred from the claim text.