Patent ID: 8217116

Claim:
A polypropylene composition, said composition comprising about 83 to about 95 weight percent of a xylene insoluble fraction comprising a xylene insoluble portion of a propylene polymer, said propylene polymer having an mmmm of from about 88 to less than about 96 percent; an Nm of from about 55 to about 120; a xylene solubles content of from about 1 to about 5%; and a polydispersity index of 2.5 to 6; and about 5 to about 17 weight percent of a xylene soluble fraction comprising a xylene soluble portion of a copolymer of propylene and ethylene, said xylene soluble fraction having about 20 to about 55 weight percent ethylene; said composition having about 1.3 to about 19 weight percent total ethylene; a polydispersity index of from about 2.5 to about 4.5; and a 50-year creep strain of less than about 8% at 1000 psi at 23° C. without creep rupture.