The Dow Chemical Company

Joseph J Conte

David G Bland

Susan K Moeller

The present invention is directed to foams produced from poly(aryl ethers) and mixtures of poly(aryl ethers) with various non-poly(aryl ether) polymers. These foams are produced using aqueous blowing agents comprising water as the only blowing agent, or mixtures of water with another blowing agent material.

Poly(aryl ether) foam produced with aqueous blowing agent

A method for preparing composite foam articles by the coextrusion of at least two interdigitated layers in abutting relationship to each other, wherein at least one layer of composite article comprises at least one expanded thermoplastic resinous material. At least one physical expansion agent is incorporated into at least one of the layers under a pressure sufficient to keep the expansion agent quiescent and the individual melt streams are combined and interdigitated into a composite layered stream. The composite layered stream is expressed while the operating pressures and temperatures of individual melt streams are controlled to provide a coextrusion product having a stable foam structure.

Method of forming a coextruded foam composite

The present invention is directed to foams produced from sulfone polymers and mixtures of sulfone polymers with various non-sulfone polymers. These foams are produced using aqueous blowing agents comprising water as the only blowing agent, or mixtures of water with another blowing agent material.

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Newark, OH, United States of America

Joseph J Conte