Moldable thermoplastic polymer foam beads

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/10 (2006.01) B29B 9/06 (2006.01) B29C 44/02 (2006.01) B29C 44/34 (2006.01) B29C 47/06 (2006.01) C08J 9/12 (2006.01) C08J 9/16 (2006.01)

Patent

CA 2201145

A continuous process for making moldable foam beads comprising a non- crosslinked or crosslinked thermoplastic polymer foam are produced by mixing a composition comprising a non-crosslinkable or crosslinkable thermoplastic polymer or a thermoplastic polymer with a crosslinking agent, additives to achieve specific properties, a blowing agent, extruding the admixture under pressure, crosslinking, when applicable, the admixture under pressure, modulating the admixtures temperature to achieve the desired foaming properties, and then expanding the admixture in a zone of lower pressure to form a foam bead that can be molded.

La présente invention concerne un procédé continu de fabrication de billes de mousse moulables comprenant une mousse polymère thermoplastique réticulée ou non. Ce procédé consiste d'abord à mélanger une composition comprenant un polymère réticulable ou non ou un polymère thermoplastique, avec un agent de réticulation, des additifs conférant des propriétés spécifiques, et un agent de gonflage. Le procédé consiste ensuite à extruder le mélange additionnel sous pression, le cas échéant, à réticuler ce dernier sous pression, et à moduler la température des mélanges additionnels de façon à obtenir les propriétés de moussage désirées. Le procédé consiste enfin à expanser ledit mélange dans une zone de moindre pression afin de former des billes de mousse susceptibles d'être moulées.

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