to a low degree of conversion of vinyl chloride the resulting mass was transferred to a 5 gallon reactor equipped with a helical stirrer set for 60 rpm and containing 90 grams of the polyolefin of example 1 1 8 ml of a 75 solution of sec butyl peroxy dicarbonate 5 0 g of decanoyl peroxide and 4 lb vinyl chloride the resulting mass was heated until the pressure in the vessel reached 170 psig and the jacket was maintained to hold this pressure for 3 75 hr at the end of this time the unreacted monomer was recovered and the reactor emptied the product was screened yielding 13 4 lb through 40 mesh 75 powdery resin 1 lb 6 of larger particle size powder that passed a 10 mesh screen but not 40 mesh 2 1 lb 12 of an on 10 mesh fraction of which 1 9 lb were in the form of pellets and 0 2 lb agglomerated powder and scaley material and finally 0 8 lb 15 of reactor scrapings etc the powdery fraction was essentially free of polyolefin as judged by the fact that a film pressed from it at 180 u00b0 c was clear also shaking a 10 g sample with 200 ml dimethylformamide a solvent for pvc but not polyolefin was clear indicating that the pvc powder contains little or no polyolefin assuming that all of the polyolefin has remained in the pellets then the pelletized product must contain 90 u00f7 870.