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US 11,376,828 B2Granted
Polyethylene film structures and related methods
AssigneeEquistar Chemicals, LP
InventorsLindsay E. Corcoran, Thomas J. Schwab
Life of this patent
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Abstract
Film structures and related methods and uses thereof are described herein. One or more of the film structures generally include an A layer, a B layer and a C layer. The B layer is positioned between the A layer and the C layer. The A layer includes high density polyethylene. The B layer includes linear low density polyethylene and a nucleating agent. The C layer includes one or more polymers. One or more of the related methods include methods for producing film structures including an A layer, a B layer, and a C layer.
Claims18
A film structure comprising:
- (A) an A layer, wherein the A layer comprises high density polyethylene;
- (B) a B layer, wherein the B layer comprises:
- (i) linear low density polyethylene;
- and
- (ii) a nucleating agent;
- and
- (C) a C layer, wherein the C layer comprises one or more polymers and the C layer has:
- (i) a melt index ranging from 0.1 to 3.0 g/10 min, as measured according to ASTM D 1238;
- and
- (ii) a density ranging from 0.910 to 0.955 g/cm3, as measured according to ASTM D 1505;
- wherein the B layer is positioned between the A layer and the C layer;
- wherein the film structure has a 1% secant modulus in the machine direction ranging from 45,000 to 75,000 psi (310 to 517 MPa), as measured according to ASTM D 882;
- wherein the film structure has a 1% secant modulus in the transverse direction ranging from 50,000 to 70,000 psi (345 to 483 MPa), as measured according to ASTM D 882;
- wherein the film structure has a transverse direction tear strength ranging from 550 to 1,200 grams, as measured according to ASTM D 1922;
- wherein the film structure has a machine direction tear strength ranging from 140 to 600 grams, as measured according to ASTM D 1922;
- and
- wherein the film structure has a normalized water vapor transmission rate ranging from 0.38 to 0.68 grams/100 in2/day (5.89 to 10.54 g/m2/day), as measured according to ASTM F 1249.
14 more elements
Dependencies are inferred from the claim text.