Stock mixture comprising one or more organic peroxides in liquid form, dispersed in a polymer matrix comprising at least 50% by weight of a bioresin containing 14C, wherein the polymer matrix has a porosity, expressed as a percentage of pores in the volume of the matrix and determined by mercury absorption according to the description, from 2.5-5 70% by volume and the concentration of water in the mother liquor as determined by Karl Fischer coulombimetric titration as the description is maintained at 2,000 ppm or less, depending on the total weight of the mother mix.
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