Lamination film and adhesive therefor

Patent metadata

Field	Value
Publication number	US-2022017705-A1
Application number	US-201917311317-A
Country	US
Kind code	A1
Filing date	Oct 25, 2019
Priority date	Dec 4, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A film structure including: (a) at least one functionalized film layer, wherein the at least one film layer comprises a polar-reactive group polyolefin layer used as an internal layer in the film structure; and (b) a lamination adhesive composition present on, and in contact with, a least a portion of a surface of the internal layer; wherein the green tack value of the adhesive composition is greater than 0.772 Newtons/centimeter; a laminate including the above film structure bonded to a substrate layer; a process for producing the film structure; a process for producing the laminate; and a laminated article made from the above laminate.

First claim

What is claimed is:

1 . A film structure comprising:
(a) at least one functionalized film layer, wherein the at least one functionalized film layer comprises a polar-reactive group polyolefin layer used as an internal lamination layer in the film structure; and (b) a lamination adhesive composition present on, and in contact with, a least a portion of a surface of the internal lamination layer; wherein the green tack value of the adhesive composition is greater than 0.772 Newtons/centimeter.

2 . The film structure of claim 1 , wherein the at least one functionalized film layer is a monolayer.

3 . The film structure of claim 1 , wherein the at least one functionalized film layer comprises a multilayer of two or more layers, wherein at least one of the two or more layers is an internal layer of a polar-reactive group polyolefin layer, and at least one of the two or more layers is an external layer.

4 . The film structure of claim 1 , wherein the polar active group polyolefin layer is selected from the group consisting of a grafted ethylene polar copolymer; a physical blend of a non-polar polyethylene and a grafted ethylene polar copolymer; a physical blend of an ethylene vinyl acetate polar copolymer and a grafted ethylene polar copolymer; and a physical blend of a grafted ethylene ethyl acrylate polar copolymer and a grafted ethylene polar copolymer.

5 . The film structure of claim 1 , wherein the lamination adhesive composition is a high solids, high performance bi-component lamination adhesive composition having predominantly isocyanate groups.

6 . A process for producing a film structure comprising the steps of:
(i) providing (a) at least one film layer, wherein the at least one film layer is a polar-reactive group polyolefin layer used as an internal layer in the film structure; (ii) providing (b) a lamination adhesive composition having a green tack value; and (iii) applying the lamination adhesive composition to a least a portion of a surface of the internal layer to form a combination film structure of the internal layer and the lamination adhesive composition.

7 . A laminate comprising:
(a) at least one functionalized film layer, wherein the at least one film layer is a polar-reactive group polyolefin layer used as an internal layer in the laminate; (b) a lamination adhesive composition present on, and in contact with, a least a portion of a surface of the internal layer; wherein the green tack value of the lamination adhesive composition is greater than 0.772 Newtons/centimeter; and (c) at least one polar or non-polar substrate; wherein at least a portion of a surface of the substrate is in contact with the adhesive composition; wherein a laminate is formed comprising the at least one functionalized film layer bonded to the at least one polar or non-polar substrate by the lamination adhesive composition disposed in between the at least one functionalized film layer and the at least one polar or non-polar substrate.

8 . The laminate of claim 7 , wherein the polar substrate is selected from the group consisting of polyethylene terephthalate, bi-oriented poly amide, metalized polyethylene terephthalate, metalized bi-oriented poly amide, and aluminum foil.

9 . The laminate of claim 7 , wherein the non-polar substrate is selected from the group consisting of polypropylene, polyethylene, and bi-oriented poly amide, and cast polypropylene.

10 . A laminated article comprising a pouch, a sachet, a stand-up pouch or other bag member made from the laminate of claim 7 .

11 . A process for producing a laminate including at least a first layer and at least a second layer comprising the steps of:
(I) providing at least one functionalized film layer forming the at least first film layer, wherein the at least one functionalized film layer is a polar-reactive group polyolefin layer used as an internal layer in the laminate; (II) providing at least one polar or non-polar film substrate forming the at least second film layer; (III) providing a lamination adhesive composition having a green tack value of greater than 0.772 Newtons/centimeter; (IV) applying the lamination adhesive composition to at least a portion of a surface of the at least first film layer to form a combination of an internal film layer and lamination adhesive composition; and (V) contacting the at least one polar or non-polar film substrate with the adhesive composition present on the at least a portion of the surface of the internal film layer such that the adhesive composition is disposed between the first and second film layers; and wherein at least a portion of a surface of the film substrate is in contact with the adhesive composition to effectuate a bond between the internal film layer and the film substrate to form a laminate.

12 . The process of claim 11 , wherein the bond strength is sufficient for the laminate to withstand a measured adhesion force of at least 200 g-f/in when the laminate is subjected to a delamination test in an attempt to delaminate the first film layer from the second film layer with the adhesive composition disposed between the layers opposing delamination.

13 . The process of claim 11 , wherein the at least second film substrate layer is selected from the group consisting of polyethylene terephthalate, bi-oriented poly amide, metalized polyethylene terephthalate, metalized bi-oriented polypropylene, aluminum foil, polypropylene, polyethylene, bi-oriented polypropylene, and cast polypropylene.

14 . A pouch, a sachet, a stand-up pouch, or other bag member made by the process of claim 11 .

Assignees

• Dow Global Technologies Llc
• Dow Quim De Colombia S A
• Rohm & Haas

Inventors

• Barreneche Felipe Martinez
• Jimenez Elkin David Cardona
• Casarrubias Juan Carlos
• Wu Jie

Classifications

• C09J2475/00

  Presence of polyurethane · CPC title

• C09J2467/008

  in the pretreated surface to be joined · CPC title

• C09J2423/008

  in the pretreated surface to be joined · CPC title

• C09J175/04

  Polyurethanes · CPC title

• B32B27/327

  comprising polyolefins obtained by a metallocene or single-site catalyst · CPC title