limiting example 1000 grams of vinyldimethylsiloxy terminated polydimethylsiloxane having a viscosity of 10 000 ctsk was manually mixed in a five gallon container with 1000 grams of polydimethylmethylhydrosiloxane having an average of 1 hydromethylsiloxy group per chain and a viscosity of 10 000 ctsk a mixture of 6200 grams of amoco 7200p polypropylene and 1800 grams of quantum chemicals 6462 hr polypropylene was also prepared a mixture containing 20 percent by weight of the siloxanes and 80 percent by weight of the polypropylenes was compounded in a twin screw counterrotating zse 67 leistritz extruder having a length to diameter ratio of 24 to 1 during compounding the temperature along the barrel of the extruder ranged from about 175 u00b0 c at the inlet to about 220 u00b0 c at the outlet the screws were rotating at 55 rpm the strands produced from the extruder were cooled on a wet belt chopped on a pelletizer dried and cooled the pellets were then added to neat polypropylene which was a mixture of the aforementioned polypropylenes in the aforementioned amounts a series of different compositions indicated below in table 1 were prepared by varying the amount of the compounded thermoplastic silicone pellets that were added to the neat polypropylene a solution of platinum tetramethyl tetravinyl cyclotetrasiloxane complex was sprayed onto the compositions 200 wppm of catalyst was added to each composition the aformentioned compositions were.