Multilayer polypropylene films and methods of making and using the same
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.
1. An article produced by a method comprising:
forming a bilayer polymer film comprising a biaxially 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., 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, and wherein the laminate does not include a tie layer between the biaxially oriented polypropylene film and the metallocene-catalyzed polypropylene film.
2. A laminate comprising:
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, and wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of from 105° C. to 130° C., 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, and wherein the laminate does not include a tie layer between the biaxially oriented polypropylene film and the metallocene-catalyzed polypropylene film.
3. The laminate of claim 2 , wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of from 105° C. to 120° C.
4. The laminate of claim 2 , wherein the laminate 1 s substantially free of ethylene-vinyl-acetate.
5. The laminate of claim 2 , wherein the biaxially oriented polypropylene film is subjected to a surface modification process.
6. The laminate of claim 5 , wherein the surface modification process comprises corona treatment, flame treatment, or plasma treatment.
7. The laminate of claim 2 , wherein the substrate is paper, plastic, metal, wood, fabric, glass, or combinations thereof.
8. The laminate of claim 2 , wherein the laminate exhibits an adhesive strength of from 0.1 lb f to 10 lb f based on a 180° peel strength test.
9. The laminate of claim 2 , wherein the laminate comprises less than 1 weight percent ethylene-vinyl-acetate.
10. The article of claim 1 , wherein the metallocene-catalyzed polypropylene film has a seal initiation temperature of from 105° C. to 120° C.
11. The article of claim 9 , 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%.
12. A bilayer film comprising:
a biaxially 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., 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, and wherein the laminate does not include a tie layer between the biaxially oriented polypropylene film and the metallocene-catalyzed polypropylene film.