Pressurization and storage of thermoplastic resin foams...

Details Pressurization and storage of thermoplastic resin foams... Pressurization and storage of thermoplastic resin foams...

C - Chemistry, Metallurgy

08

J

18/650

C08J 9/36 (2006.01) B29C 44/34 (2006.01) C08J 9/12 (2006.01) C08J 9/228 (2006.01)

Patent

CA 1182259

ABSTRACT A method for decreasing the density of a substantially closed-cell thermoplastic resin foam material by the secondary expansion thereof. The method comprises increasing the gas pressure within the cells, retaining that elevated cell pressure for pro- longed periods and then heating the foam material above its heat plastifying temperature to cause secondary expansion thereof. In an example, a low density poly- ethylene material was foamed to produce a foam with a density of approximately 0.085 grams per cubic centimeter. This foam was then pressurized with nitrogen and afterward secondarily expanded to produce a foam with a density of approximately 0.036 grams per cubic centimeter.

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