Soft, puncture- and tear-resistant polyolefin films
AssigneeQuantum Chemical Corporation
InventorsLisa K. Johnson, Paul E. Bowen, Thaddeus W. Klimek, Michael B. Edwards
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Abstract
Tough, puncture- and tear-resistant films having a high degree of flexibility and softness are provided. The monolayer and multilayer films of the invention are obtained using copolymers of propylene with 8 to 40 weight percent ethylene produced by gas phase polymerization of the monomers in dual reactors. The films will have a 1% secant modulus from 5,000 psi to 70,000 psi. Melting points of these films are higher than that of low density polyethylene and, most generally, in the range 125.degree. C. to 160.degree. C.
Claims11
A puncture-resistant propylene-ethylene copolymer film having a 1% secant modulus from 5,000 psi to 70,000 psi and Elmendorf tear value greater than 100 grams per mil thickness in both the machine direction and the transverse direction, said copolymer containing from 3 to 47 weight percent ethylene and having a melt flow from 0.01 to 500 dg/min and melting point from 115.degree. C. to 160.degree. C.
Dependencies are inferred from the claim text.