Patent ID: 7060754

Claim:
A method of nucleating a propylene copolymer having a maximum crystallinity of about 43% and comprising at least about 60 wt % of the units derived from propylene, and between about 3 and 40 wt % the units derived from the unsaturated comonomer, the copolymer further characterized as having at least one of the following properties: (i) 13 C NMR peaks corresponding to a regio-error at about 14.6 and about 15.7 ppm, the peaks of about equal intensity, (ii) a skewness index, S ix , greater than about −1.20, and (iii) a DSC curve with a T me that remains essentially the same and a T max that decreases as the amount of comonomer in the copolymer is increased, the method comprising contacting the propylene copolymer with less than about 10 weight percent of a semi-crystalline branched or coupled polymeric nucleating agent.