Kyu Hyun Lee

US Patent:

49390198, Jul 3, 1990

Filed:

Nov 15, 1989

Appl. No.:

7/436834

Inventors:

Ching-Chi Kuo - Pleasanton CA
Mark Robertson - Fremont CA
Kyu W. Lee - Danville CA

Assignee:

Hexcel Corporation - Dublin CA

International Classification:

B32B 900
B32B 326
B32B 2700

US Classification:

4283184

Abstract:

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.

US Patent:

49181106, Apr 17, 1990

Filed:

Sep 12, 1988

Appl. No.:

7/243383

Inventors:

Ching-Chi Kuo - Pleasanton CA
Mark Robertson - Fremont CA
Kyu W. Lee - Danville CA

Assignee:

Hexcel Corporation - San Francisco CA

International Classification:

C08J 910
C08J 912

US Classification:

521 82

Abstract:

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.