Aluminum Company of America

Gary J DiFranco

Thomas L Levendusky

John M Stinson

Willy M Balaba

David A Smith

Roy B Steidley

Vincent J Downard

Susan A Stanton

John R McAllister

William F Forster

A method for extrusion coating both sides of a metal strip. A metal strip, such as aluminum alloy strip, is moved through a pre-conditioner, two extrusion dies, a post heater and a cooling system. Both sides of the strip are coated with thin coatings of polyester material. The coated metal strip is useful for containers, such as cans and can ends, as well as for automobiles, appliances, aerospace, construction and electrical devices.

Method for coating a metal strip

A stable gel is formed by reacting alumina hydrate sol and a vinyl alcohol-vinyl acetate copolymer in an aqueous solution having pH less than about 7 to form a polymeric sol and then transforming the sol to a gel. The copolymer preferably comprises polyvinyl acetate that is about 85-99% hydrolyzed. The gel is drawn into a thin layer and water is removed to form a thin, substantially crack-free film. The film makes a stable, generally transparent insulating material.

Forming clear gel and transparent film by reacting alumina hydrate with

Growing community of inventors

Pittsburgh, PA, United States of America

Gary J DiFranco