Multilayer polypropylene films and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-10144201-B2
Application number	US-201514856051-A
Country	US
Kind code	B2
Filing date	Sep 16, 2015
Priority date	Sep 1, 2009
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

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.

First claim

What is claimed is:

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.

Assignees

• Fina Technology

Inventors

• Nairn Lea Ann
• Vargas Marco Vinicio Araya

Classifications

• B32B27/16

  specially treated, e.g. irradiated · CPC title

• Y10T428/31913

  Monoolefin polymer · CPC title

• B32B2309/02

  Temperature · CPC title

• B32B2307/514

  Oriented · CPC title

• B32B2307/31

  Heat sealable · CPC title