Manufacture of modified polypropylene compositions using...

Details Manufacture of modified polypropylene compositions using... Manufacture of modified polypropylene compositions using...

C - Chemistry, Metallurgy

08

F

400/3074

C08F 255/02 (2006.01) B29C 47/00 (2006.01) B29C 47/40 (2006.01) C08L 51/06 (2006.01)

Patent

CA 2003615

ABSTRACT OF THE DISCLOSURE A method for the grafting of alpha, beta unsaturated carboxyic acids or anhydrides onto polypropylene is disclosed. The process comprises admixing polypropylene in melt processing apparatus with 0.01 to 5% by weight of at least one of the acid and anhydride and 0.01 to 2% by weight of an organic peroxide, and extruding and recovering the grafted polypropylene. The apparatus is a twin screw extruder comprising a pair of elongated communicating barrels with parallel adjacent rotatable screws located therein, the screws having flights that are in a non-intermeshing relationship. The method results in the production of grafted polypropylene that exhibits superior adhesive properties, compared with grafted polypropylene formed in twin screw extruders having intermeshing screws. The grafted polypropylene may be used in adhesive formulations. DC-0238

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