The Dow Chemical Company

Dow Global Technolgoies LLC

Daniel A Alderman

Leonardo C Lopez

Maurice L Zweigle

Gary J Schulz

Wu Chen

Troy D Wolford

The instant invention generally provides a porous filter medium, a porous composite filter medium, a filter assembly, processes of making the same, and processes suitable for filtering contaminants from liquids.

Filter medium

A method of making a cold water dispersible granular composition comprising a plasticizer and thermally moldable polymer, for example hydroxypropyl methylcellulose, hydroxypropyl cellulose, carboxymethylcellulose, or hydroxy ethylcellulose. The method comprises, extruding the composition at elevated temperatures to form an extruded material and grinding the extruded material to form a granular product. The granules are very dispersible in cold water and when added to cold water, the solution can be used in coating operations, such as to coat pharmaceuticals, foods and food supplements to protect, color, harden, make foods more palatable or mask the taste of solid dosage forms.

Method of making a granular, cold water dispersible coating composition

The release of an active composition from a solid tablet can be delayed by employing a fine particle sized hydroxypropyl methylcellulose ether composition.

Sustained release compositions

Solid tablets of a therapeutically active composition exhibit sustained release properties when compressed with a fine particle sized hydroxypropyl cellulose ether composition.

Sustained release compositions comprising hydroxypropyl cellulose ethers

A transdermal pharmaceutical dosage form comprises

Sustained release dosage form based on highly plasticized cellulose

A solid sustained release dosage form is disclosed comprising a gel matrix containing HPMC and a major amount of a plasticizer therefor into which gel matrix is reversibly dispersed a pharmaceutically active agent.

Dispersions capable of the sustained release of active organic agents comprising an aqueous dispersion of a water-insoluble cellulose ether which cellulose ether particles have reversibly diffused therein the active agent. The dispersions may be used as dispersions, dewatered to form a powder, or coalesced to form films or other articles all of which are capable of sustained release of the active agent.

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Midland, MI, United States of America

Daniel A Alderman