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US 12,576,613 B2Granted
Multilayer film structure
AssigneeNOVA Chemicals (International) S.A.
InventorsMarzieh Ebrahimi, Soheil Sadeghi, Patrick Lam, Vinod Konaganti, Norman Aubee
Life of this patent
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Abstract
An all polyethylene multilayer film structure having alternating layers of (A) a linear low density polyethylene and (B) a high density polyethylene has improved performance properties relative to a film structure in which the (A) and (B) layers are arranged in a block like or random manner.
Claims14
An all polyethylene multilayer film structure, the film structure comprising at least five alternating and adjacent layers of:
- (A) a linear low density polyethylene having a density of from 0.910 g/cm3 to 0.940 g/cm3 and a melt index, I2 of from 0.1 to 10 g/10 min;
- and
- (B) a high density polyethylene having a density of at least 0.945 g/cm3, a melt index, I2 of from 0.1 to 10 g/10 min and comprising from 0 to 1 weight percent of a nucleating agent or a mixture of nucleating agents;
- wherein the high density polyethylene is a polyethylene homopolymer composition, the polyethylene homopolymer composition comprising:
- (i) 95 to 30 weight percent of a first ethylene homopolymer having a density of from 0.950 to 0.975 g/cm3;
- and
- (ii) 5 to 70 weight percent of a second ethylene homopolymer having a density of from 0.950 to 0.975 g/cm3,
- wherein the ratio of the melt index, I2 of the second ethylene homopolymer to the melt index, I2 of the first ethylene homopolymer is at least 10,
- wherein the multilayer film has three or more of:
- a haze value as measured by ASTM D1003-13 of from 8% to 25%;
- a gloss value as measured by ASTM D2457-13 at 45 degrees of greater than 45;
- a puncture energy as measured by ASTM D5748-95 of from 50 to 90 J/mm;
- a Dynatup maximum load measured at ASTM conditions of from 4.5 to 10.0 lb;
- a transverse direction (TD) curvature radius of greater than 25 mm;
- or
- a machine direction (MD) curvature radius of greater than 25 mm;
- and
- wherein the film exhibits:
- a machine direction (MD) 1% secant modulus as determined by ASTM D882-12 of from 400 MPa to 700 MPa;
- a transverse direction (TD) 1% secant modulus as determined by ASTM D882-12 of from 500 MPa to 900 MPa;
- an oxygen transmission rate (OTR) of from 25 to 100 cm3 per 100 inches2 per 24 hours;
- and
- a water vapor transmission rate (WVTR) as measured by ASTM F1249-90 of from 0.04 to 0.24 grams per 100 inches2 per 24 hours.
20 more elements
Dependencies are inferred from the claim text.