manufacturing process control difficult because of the sharp change in the decalin soluble with a slight process control variation in the amount of the donor concentration to achieve the desired balance of melting point and decalin soluble 10 mole of mcms mixed with the teos the number 4 ranked crystallinity as shown in table 1 the resulting plot of the polymer property with the donor blend concentration is shown in fig2 data for which is in table 3 as evident in fig2 the melting point of the resultant polypropylene using the donor blend decreased compared to the use of 100 mcms while the decalin soluble capability increased the decalin solubles increased by about 80 in the mcms teos mixture relative to the mcms alone to further improve the melting point decalin soluble balance some ptms donor was combined with both mcms and teos at a mole ration of 80 15 5 teos ptms mcms hereinafter a mole ratio may be expressed in terms of the relative mole percentages the percentages adding to 100 mole this donor blend further improved the melting point capability to a desirable range of 163 163 5 u00b0 c while achieving a decalin soluble of around 4 0 as shown in fig3 data for which is in table 3 the decalin solubles are about 100 greater for the teos ptms mcms blend relative to mcms alone as well as most of the electron donors in table 1 as is evident in fig3 the slope or profile of the decalin soluble vs donor concentration is not as.