Expanded polypropylene resin bead and process of producing same

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/18 (2006.01) C08J 9/224 (2006.01) C08L 23/12 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2421888

Expanded, substantially non-crosslinked polypropylene resin beads capable of producing a high rididity foamed molding at a relatively low temperature. The beads are produced by a process including a step of dispersing substantially non-crosslinked polypropylene resin particles in a dispersing medium containing an organic peroxide to obtain a dispersion, a step of heating the dispersion to decompose the organic peroxide and to modify the surface of the surface-modified polypropylene resin particles, and a step of expanding the non-crosslinked, surface-modified polypropylene resin particles using a blowing agent.

L'invention concerne des grains de résine en propylène pratiquement pas réticulé, expansé, qui peuvent produire une pièce moulée alvéolaire de rigidité élevée à une température relativement basse. On produit les grains au moyen d'un processus consistant à disperser des particules de résine en propylène pratiquement pas réticulé dans un milieu de dispersion renfermant un peroxyde organique de manière à obtenir une dispersion, à chauffer la dispersion pour décomposer le peroxyde organique et pour modifier la surface des particules de résine en propylène modifiées superficiellement, et à expanser les particules de résine en propylène modifiées superficiellement à l'aide d'un agent d'expansion.

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