Degradation of polypropylene for future improved processability

Details Degradation of polypropylene for future improved processability Degradation of polypropylene for future improved processability

C - Chemistry, Metallurgy

08

J

18/1167, 402/592

C08J 5/00 (2006.01) C08F 8/50 (2006.01) C08J 3/22 (2006.01) C08K 5/14 (2006.01) C08L 23/12 (2006.01) C08L 91/00 (2006.01)

Patent

CA 1210176

ABSTRACT OF THE DISCLOSURE Thermoplastic polypropylene polymers of improved processability obtained by initial partial degradation of high molecular weight polymers using a chemical prodegradant present in excess of the amount that reacts during pelletization. After pelletizing, the polymer can be handled and shipped without difficulty. When remelted by extruding or the like, the additional prodegradant in the pellets reacts further reducing the molecular weight as well as the molecular weight distribution of the polymer to a point where high capacity production of quality fibers and extruded products can be obtained. The prodegradant is preferably of the type that predictably and controllably affects the polymer molecular properties without being significantly affected by minor fluctuations in the polymer producer's or processor's manufacturing steps. Specific preferred embodiments include 2,5- dimethyl - 2,5 bis-(t-butylperoxy) hexyne-3 or 3,6,6,9,9-pentamethyl-3-(ethyl acetate)-1,2,4,5- textraoxy cyclononane as the prodegradant added in an amount providing an amount of unreacted pro- degradant after pelletizing of about 0.01 to 0.40 percent based on the weight of polymer. The present invention reduces the safety hazards attendant handling free radical prodegradants by the polymer processor and avoids the need for multiple addition of prodegradants while still producing a material that can be processed easily by the polymer producer and processor.

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