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US 11,873,355 B2Granted
Propylene-ethylene copolymer compositions suitable for hot fill packaging of foodstuffs
AssigneeW.R. Grace & Co.-Conn.
InventorsMatthew John Fedec, Jan Willem Van Egmond, Manu Rego, John Kalevi Kaarto, Li-Min Tau
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Abstract
Propylene-ethylene copolymer compositions and production methods are provided. The copolymer compositions can be particularly advantageous for use in hot fill packaging of foodstuffs. The propylene-ethylene copolymers can be produced using a Ziegler-Natta catalyst and an alkoxysilane electron donor. The compositions can have propylene as a primary monomer with an ethylene content ranging from 2.0 to 6.0 percent by weight with a xylene soluble content of less than 7.0 percent by weight.
Claims18
A propylene-ethylene copolymer comprising:
- propylene as a primary monomer;
- an ethylene content (ET) of from 2.0% to 5% by weight;
- a melt flow rate greater than 45 g/10 min and less than 100 g/10 min;
- a xylene soluble fraction (XS) of from 2.0% to 7.0% by weight;
- and
- a xylene soluble fraction to ethylene content ratio (XS/ET) of less than or equal to 1.51.
3 more elements
Dependencies are inferred from the claim text.