Coextruded foam composite

Details Coextruded foam composite Coextruded foam composite

C - Chemistry, Metallurgy

08

J

C08J 9/32 (2006.01) B29C 44/22 (2006.01) B29C 47/06 (2006.01) B29C 47/70 (2006.01) B32B 5/22 (2006.01)

Patent

CA 2050708

The present invention provides a method for preparing composite foam articles by the coextrusion of at least two interdigitated layers in abutting relationship to each other, with at least one layer of the composite article being an 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.

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