Use of a polypropylene based composition for expanded beads

Details Use of a polypropylene based composition for expanded beads Use of a polypropylene based composition for expanded beads

C - Chemistry, Metallurgy

08

L

C08L 23/16 (2006.01) C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08L 23/10 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2462731

Use of a polypropylene based composition (C) comprising (a) from 5 to 95 % by weight of a random copolymer of propylene (A) containing from 0.5 to 12 mole% of at least one comonomer chosen from ethylene and/or an alpha-olefin containing from 4 to 6 carbon atoms, and having an MFIA in the range from 0.01 to 5 g/10 min, (b) from 95 to 5 % by weight of a random copolymer of propylene (B) containing from 0.5 to 12 mole% of at least one comonomer chosen from ethylene and/or an alpha--olefin containing from 4 to 6 carbon atoms, and having an MFIB in the range from 15 to 1000 g/10 min, said composition (C) being such that random copolymers (A) and (B) contain the same comonomer(s) and have, for each comonomer, substantially the same comonomer content, for the manufacturing of expanded beads.

L'invention concerne l'utilisation d'une composition à base de polypropylène (C) comprenant (a) entre 5 et 95% en poids d'un copolymère aléatoire de propylène (A) contenant entre 0,5 et 12% molaires d'au moins un comonomère choisi parmi un éthylène et/ou une alpha-oléfine renfermant entre 4 et 6 atomes de carbone, et présentant une valeur MFI<SB>A</SB> comprise entre 0,01 et 5 g/10 min, et (b) entre 95 et 5% en poids d'un copolymère aléatoire de propylène (B) contenant entre 0,5 et 12% molaires d'au moins un comonomère choisi parmi un éthylène et/ou une alpha-oléfine renfermant entre 4 et 6 atomes de carbone, et présentant une valeur MFI<SB>B</SB> comprise entre 15 et 1000 g/10 min. Ladite composition (C) se caractérise en ce que les copolymères aléatoires (A) et (B) contiennent le ou les mêmes conomomères et présentent sensiblement la même teneur en comonomère pour chaque comonomère. Elle est utile dans la fabrication de perles expansées.

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