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US 7,935,766 B2Granted
Propylene impact copolymer and method
AssigneeDow Global Technologies LLC
InventorsWilliam G. Sheard, Linfeng Chen
Life of this patent
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Abstract
Disclosed are propylene impact copolymer compositions, articles thereof, and processes for producing same. Polymerization with an improved catalyst composition provides a propylene impact copolymer with high melt flow and low volatiles content.
Claims20
A polymerization process comprising:
- contacting, under polymerization conditions, propylene with a catalyst composition comprising a substituted phenylene aromatic diester in a first polymerization reactor;
- forming an active propylene-based polymer;
- contacting, under polymerization conditions, the active propylene-based polymer with at least one olefin in a second polymerization reactor;
- and
- forming a propylene impact copolymer comprising a substituted phenylene aromatic diester.
2 more elements
A propylene impact copolymer comprising:
- a propylene-based polymer;
- a propylene/ethylene copolymer dispersed within the propylene-based polymer;
- and
- a substituted phenylene aromatic diester.
1 more element
An article comprising:
- a propylene impact copolymer comprising 3-methyl-5-tert-butyl-1,2 phenylene dibenzoate.
Dependencies are inferred from the claim text.