초록 ▼

Provided are articles such as packaging materials and medical devices having enhanced tolerance to radiation and heat, produced from a blend of from about 99% to about 50% by weight homo or copolymerized polypropylene and about 1% to about 50% by weight polyethylene produced by single-site catalysis

Provided are articles such as packaging materials and medical devices having enhanced tolerance to radiation and heat, produced from a blend of from about 99% to about 50% by weight homo or copolymerized polypropylene and about 1% to about 50% by weight polyethylene produced by single-site catalysis, such polyethylene having a MWD between about 1 and about 4, and a CDBI greater than about 45%. Optionally, other blend components may be added, such as hindered amine stabilizers, secondary antioxidants, clarifying nucleators and secondary antioxidants. Also provided are processes for producing such articles.

대표청구항 ▼

[ We claim:] [1.]1. An article of manufacture which has been exposed to radiation sufficient for sterilization, comprising a blend of from about 50 to about 99 wt % polypropylene with from about 1 to about 50 wt % polyethylene, said polyethylene having a molecular weight distribution between about 1

[ We claim:] [1.]1. An article of manufacture which has been exposed to radiation sufficient for sterilization, comprising a blend of from about 50 to about 99 wt % polypropylene with from about 1 to about 50 wt % polyethylene, said polyethylene having a molecular weight distribution between about 1 and about 4, and a composition distribution breadth index greater than about 45% wherein the amount of polyethylene present in the blend is sufficient to increase the radiation tolerance of the article over that of the polypropylene alone.