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US 9,174,384 B2Granted
Multilayer polypropylene films and methods of making and using same
AssigneeFina Technology, Inc.
InventorsLea Ann Nairn, Marco Vinicio Araya Vargas
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Abstract
A method including forming a bilayer polymer film having an oriented polypropylene film and a metallocene-catalyzed polypropylene film wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of from 80° C. to 130° C. A laminate including a biaxially oriented polypropylene film, a metallocene-catalyzed polypropylene film, and a substrate, wherein the metallocene-catalyzed polypropylene film is disposed between the biaxially oriented polypropylene film and the substrate.
Claims17
A method comprising:
- forming a bilayer polymer film comprising an oriented polypropylene film and a metallocene-catalyzed polypropylene film, wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of between 105° C. and 120° C., and wherein the metallocene-catalyzed polypropylene film comprises metallocene catalyzed ethylene-propylene random copolymer having melt flow rate of from 10 g/10 min. to 500 g/10 min, wherein the bilayer polymer film does not include a tie layer between the oriented polypropylene film and the metallocene-catalyzed polypropylene film, and wherein the bilayer polymer film has a haze percentage of from 1.5% to 7%.
A method comprising:
- biaxially orienting a polypropylene film to prepare a biaxially oriented polypropylene film;
- and
- after preparing the biaxially oriented polypropylene film, extrusion coating a metallocene-catalyzed polypropylene film onto the biaxially oriented polypropylene film to form a bilayer polymer film;
- wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of between 105° C. and 120° C., wherein the metallocene-catalyzed polypropylene film comprises metallocene-catalyzed ethylene-propylene random copolymer having a melt flow rate of from 10 g/10 min. to 500 g/10 min, wherein the bilayer polymer film does not include a tie layer between the oriented polypropylene film and the metallocene-catalyzed polypropylene film, and wherein the bilayer polymer film has a haze percentage of from 1.5% to 7%.
1 more element
Dependencies are inferred from the claim text.