Extrusion compositions with improved melt flow

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 8/00 (2006.01) C08F 8/50 (2006.01) C08L 23/04 (2006.01) C08L 23/12 (2006.01) C08L 23/16 (2006.01) H01B 3/44 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2400436

Extrusion compositions having improved melt stability and suitable for use in high-speed extrusion coating operations are disclosed. The compositions are a dynamically modified mixture of a first polymeric component which is a reactor- made or physically blended mixture of polypropylene and an ethylene-propylene copolymer, a second polymeric component which is a fractional melt index homopolymer or copolymer of ethylene and an organic peroxide.

L'invention concerne des compositions d'extrusion dont la stabilité à l'état fondu est améliorée et pouvant convenir pour une utilisation dans des opérations de recouvrement par extrusion à vitesse élevée. Ces compositions sont constituées d'un mélange modifié dynamiquement d'un premier composant polymère constitué d'un mélange de polypropylène et de copolymère éthylène-propylène produit par réaction et homogénéisé physiquement, et d'un second composant polymère constitué d'un homopolymère ou d'un copolymère d'éthylène et d'un peroxyde organique à indice de fluidité à chaud fractionnel.

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