High melt flow, highly-grafted polypropylene

Details High melt flow, highly-grafted polypropylene High melt flow, highly-grafted polypropylene

C - Chemistry, Metallurgy

08

F

C08F 255/00 (2006.01) C08F 255/02 (2006.01)

Patent

CA 2419602

Modified polymers, particularly polyolefins with improved flow over that of polyolefin alone, are produced by reacting polypropylene, maleic anhydride monomer, and a peroxy initiator in a twin-screw extruder. The maleic anhydride monomer is injected as a fluid and is grated onto the base polypropylene during the degradation/chain scissioning process. Novel, highly-grafted polymers with high melt flow and other useful properties are produced in pellet form.

On produit des polymères modifiés, en particulier, des polyoléfines plus coulantes qu'une polyoléfine seule, par réaction de polypropylène, d'un monomère d'anhydride maléique et d'un initiateur de peroxyde dans une extrudeuse possédant une double vis. On injecte le monomère d'anhydride maléique sous forme liquide et on le greffe sur le polypropylène de base pendant le processus de scission de chaîne et de dégradation. Ceci permet d'obtenir sous forme de granules de nouveaux polymères très coulants en fusion possédant un niveau élevé de greffe, ainsi que d'autres propriétés utiles.

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