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US 6,472,474 B2Granted
Propylene impact copolymers
AssigneeExxonMobil Chemical Patents Inc.
InventorsTerry John Burkhardt, Robert Tan Li, Aspy Keki Mehta, Udo M. Stehling, William T. Haygood, Jr., Francis C. Rix, Dawn C. Wiser
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Abstract
This invention relates to propylene impact copolymer compositions. In particular, these unique and improved compositions can be produced using conventional, commercial-scale processes.
Claims22
A propylene impact copolymer composition comprising:
- from 40% to 95% by weight Component A based on the total weight of the impact copolymer, Component A comprising propylene homopolymer or copolymer, wherein the copolymer comprises 10% or less by weight ethylene, butene, hexene or octene comonomer, and the amount of amorphous polypropylene in Component A is less than 2 wt %;
- and
- from 5% to 60% by weight Component B based on the total weight of the impact copolymer, Component B comprising propylene copolymer, wherein the copolymer comprises from 20% to 70% by weight ethylene, butene, hexene and/or octene comonomer;
- wherein Component B is formed in the presence of Component A in a multiple stage polymerization process.
1 more element
Dependencies are inferred from the claim text.