WO1996005055B1

WO1996005055B1 - Barrier films

Info

Publication number: WO1996005055B1
Application number: PCT/US1995/008664
Authority: WO
Filing date: 1995-07-12
Publication date: 1996-03-21

Abstract

A multiple-layer composite film comprising: a layer comprising a polymeric base film (12), a barrier layer (13) comprising a carbon-rich material adhered to the base layer, and a heat sealable layer (14) comprising a heat sealable, active gas treated, polymeric material containing ethylene monomeric units adhered to the carbon-rich barrier layer (13).

Claims

AMENDED CLAIMS [received by the International Bureau on 15 February 1996 (15.02.96); original claims 3-43 amended; original claims 6-43 renumbered as claims 6-15; remaining claims unchanged (3 pages)]

1. A multiple-layer composite film comprising:

(a) a base layer comprising a polymeric material;

(b) a barrier layer comprising a carbon-rich material adhered to the base layer, and

(c) a heat sealable layer comprising an active gas treated, heat sealable, polymeric material containing cthylene monomeric units adhered to the barrier layer.

2. The film of claim 1 wherein the heat sealable layer is corona-treated.

3. The film of claims 1 or 2 having a peel strength between the heat sealable layer and the barrier layer of at least about 15 ounces/inch (167 grams/cm).

4. The film of claims 1 or 2 wherein the base layer is directly adhered to the barrier layer, which is directly adhered lo the heat sealable layer.

5. The films of any one of claims 1-4 wherein ϋie heat sealable polymeric material comprises a heat sealable polymer selected from the group consisting of an cthylene-α-olefin polymer; an acid or anhydride modified ethylene-α-olefin polymer, an ethylene-conlaining polymer having -C(O)OR groups, -OC(O)R groups; an acid or anhydride modified ethylene-containing polymer having -C(O)OR groups, -OC(O)R groups; an acid or anhydride modified polyethylene homopolymer; and mixtures thereof; wherein R represents a monovalent hydrocarbyl group.

6. The film of any one of claims 1-5 having an oxygen permeability of less than about 2.0 cubic centimeters of oxygen per 1 square meter of film per day, and a moisture permeability of less than about 2.0 grams of water vapor per 1 square meter of film per day.

7. The film of any one of claims 1-6 wherein the heat sealable polymeric material further includes about 10-40% elastomeric polymer.

8. The film of claim 1 wherein the heat sealable polymeric material comprises a single-site, ethylene-α-olefin polymer containing a total α- olcfin content of about 10-30% having a density of less than about 0.930 g/cm³ and a polydispersity of less than about 3.5.

9. A process for preparing the multiple-layer composite film of claims 1 or 2; the process comprising treating the heat sealable layer with an active gas surface treatment technique and laminating it to the barrier layer at a temperature of at least about 82ºC.

10. The process of claim 9 wherein the step of corona treating comprises air corona treating.

11. A container comprising a body having an opening therein and a covering over the opening, the covering comprising the multiple-layer composite film of claims 1 or 2.

12. The container of claim 11 wherein the heat sealable polymeric material comprises a single-site, ethylene-α-olefin polymer or an ethylene propylene elastomer.

13. The container of claims 11 or 12 wherein the multiple-layer composite film is part of an induction innerseal, a tabbed innerseal, a one-piece innerseal, a two-piece innerseal, a lidding film, or a blister pack.

14. A container comprising a body having therein the multiple- layer composite film of claims 1 or 2.

15. The container of claim 13 wherein the body is in the form of a gable-top carton, a brick pack, or a pouch.