Hexcel Corporation

Ching-Chi Kuo

Yen-Seine Wang

Frank W Lee

Kyu Wang Lee

Mark Robertson

Kenneth S Baron

David B Conway

Ken Baron

High strength foam-filled materials and methods for their production are disclosed. The high strength materials include cellular structures comprising a plurality of open-ended cells containing polycyanurate foam. The polycyanurate foam-filled cellular structures have synergistically high mechanical properties and improved resistance to moisture. When cyanate ester foamable precursors in the form of tough films are foamed to fill honeycomb cells, the resulting foam-filled honeycomb has uniformly fine foam cell structure and improved bonding between the foam and the honeycomb.

Foam filled honeycomb and methods for their production

Foamable resin compositions of cyanate esters and thermoplastic resins are disclosed.

Cyanate resin-based foams

Plastic foam materials having a high degree of structural integrity, cell network uniformity and small cell size are obtained from (meth)acrylic acid and (meth)acrylonitrile by incorporating acrylamide as a comonomer additive within certain ranges of concentration. Incorporation of the latter together with conventional additives normally used in preparing foams from the principal monomers helps to avoid preliminary precipitation during the polymerization process, and the gradients in the polymer microstructure which frequently result and cause internal stresses and weaknesses in the ultimate product.

Compositions and process for producing foam plastics

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Pleasanton, CA, United States of America

Ching-Chi Kuo