The Dow Chemical Company

The Cynara Co.

Alan F Burmester

Ritchie A Wessling

Stephen E Bales

Henry N Beck

George J Quarderer, Jr

Thomas O Jeanes

Thomas Caldwell Young

David J Moll

Kent B McReynolds

Charles Z Hotz

Bethanne L Smith

Ronald M Lacher

James E Clark

Chieh-Chun Chau

Larry D Yats

Kenneth J Cleereman

O Carl Raspor

John S Trent

Gas separations utilizing glassy polymer membranes at sub-ambient

This invention relates to a method of and apparatus for separating component gases in a gas mixture employing a glassy polymer membrane at temperatures of 5.degree. C. or less so as to achieve superior separation of gas components.

A method for filtering liquid or gaseous materials where the filtration is conducted with a porous filter media prepared from an aqueous wet-laid, lofted fiber-reinforced composite sheet, the composite sheet comprising a heat fusible polymer, reinforcing fibers and a binder. The random fiber composite sheet can be selectively lofted or recompressed to form filter media having variable porosity. Also, a membrane support means prepared by applying or treating the fiber-reinforced composite sheet with a discriminating membrane layer.

Porous filter media and membrane support means

Microporous, asymmetric membranes comprising syndiotactic vinylaromatic polymers having utility as membranes for ultrafiltration or reverse osmosis and a process for their production.

Microporous membranes of syndiotactic vinylaromatic polymers

A process for in mold polymerization and a composition for use therein comprising a polymerizable vinyl aromatic monomer and a particulated, semicrystalline nonmiscible polymer.

In-mold polymerization of vinyl aromatic compound

An improved, essentially scrap-free, solid-phase process for making thermoplastic articles directly from resinous powder. The process can be particularly advantageous to forming large parts from thermoplastic resinous powders. The method essentially comprises taking resinous powder, briquetting the powder, sintering the briquette, repressing the powder in a warm state and then shaping the briquette into a preform or a blank which can then be thermoformed into a resulting container or other product, assuming the blank itself is not the desired end product. Alternatively, sintering can take place after repressing with preheating of the briquette prior to the repressing step.

Method of forming blanks for the solid-phase forming of thermoplastic

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Midland, MI, United States of America

Alan F Burmester