Polypropylene resins for multiple cavity stretch blow molding

A process for reducing the cycle time of multiple cavity stretch blow molding processes comprising the steps of:

• preparing a resin composition comprising:
• (a) a propylene-ethylene copolymer resin including from about 5% to about 15% of a second stage polymer characterized by a cycle time of T.sub.1 when used to produce containers in multiple cavity stretch blow molding processes;
• (b) from about 0.1% to about 1.0% of a nucleating agent prepared by irradiating in air a mixture of a propylene homo or copolymer and about 500 to about 3000 pp of antioxidant with a sufficient amount of ionizing radiation to cause said nucleating agent to have a xylene insoluble content of at least 30%;
• said resin composition characterized by a cycle time of T.sub.2 when used to produce containers in multiple cavity, stretch blow molding processes such that the ratio of T.sub.2 /T.sub.1 is less than 0.95;
• and using the resin composition to produce articles in multiple cavity stretch blow molding processes.