Novel foamable compositions for rotational molding

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/34 (2006.01) B29C 41/00 (2006.01) C08J 9/00 (2006.01) C08L 23/04 (2006.01) B29C 41/04 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2257463

Novel molding compositions consisting essentially of a mixture of a skin- forming component and a foam core-foaming component physically dry-blended together. The skin-forming component comprises two distinct phases blended together, a high zero-shear viscosity material and a low zero-shear viscosity material. The foam core-forming component preferably comprises a foamable polymeric material including a suitable blowing agent. In a preferred embodiment, the three materials are selected from suitable homopolymers and copolymers of ethylene.

La présente invention concerne des compositions pour moulage constituées essentiellement d'un mélange comportant d'une part un composant de formation de peau et d'autre part un composant d'expansion de l'âme de mousse, ces composants constituant physiquement un mélange sec. Le composant de formation de peau comprend deux phases distinctes mélangées ensemble: d'une part un matériau de haute viscosité à cisaillement nul, et d'autre part un matériau de faible viscosité à cisaillement nul. Le composant d'expansion de l'âme de mousse est constitué de préférence d'un matériau polymère expansible incluant un agent gonflant pour mousse. Selon une réalisation préférée, ces trois matériaux sont sélectionnés dans un groupe d'homopolymères et de copolymères d'éthylène appropriés.

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