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DE-102024132820-A1 - Sterilizable high-barrier laminate, high-barrier structure for the high-barrier laminate, use of the high-barrier structure for the production of the high-barrier laminate, and use of the high-barrier laminate for the production of packaging and packaging with the high-barrier laminate

DE102024132820A1DE 102024132820 A1DE102024132820 A1DE 102024132820A1DE-102024132820-A1

Abstract

The invention relates to a sterilizable high-barrier laminate (10), in particular for the production of packaging, comprising an outer first polypropylene film (20) and an outer second polypropylene film (30) arranged opposite the outer first polypropylene film (20), wherein at least one high-barrier structure (40) is arranged between the first polypropylene film (20) and the second polypropylene film (30), which, in particular in the following order, consists of at least one topcoating layer (50), an aluminum bonding layer (60), a primer layer (70) and a polypropylene support layer (80), and furthermore a high-barrier structure (40), in particular for a sterilizable high-barrier laminate (10) according to one of the preceding claims, wherein the high-barrier structure (40), in particular in the following order, consists of at least one topcoating layer (50), an aluminum bonding layer (60), a primer layer (70) and a polypropylene support layer (80), and furthermore a use of such a high-barrier structure (40). for the production of a high barrier laminate (10) and the use of such a high barrier laminate (10) for the production of packaging and furthermore packaging with such a high barrier laminate (10).

Inventors

  • Markus Schaeftner
  • Bastian Bäuerlein
  • Katharina Mayer

Assignees

  • HUHTAMAKI FLEXIBLE PACKAGING GERMANY GMBH & CO. KG

Dates

Publication Date
20260513
Application Date
20241111

Claims (16)

  1. Sterilizable high-barrier layer laminate (10), in particular for the production of packaging, comprising an outer first polypropylene film (20) and an outer second polypropylene film (30) arranged opposite the outer first polypropylene film (20), characterized in that at least one high-barrier structure (40) is arranged between the first polypropylene film (20) and the second polypropylene film (30), which consists, in particular in the following order, of at least one topcoating layer (50), an Alubond layer (60), a primer layer (70) and a polypropylene support layer (80).
  2. High-barrier layer laminate according to Claim 1 , characterized in that the at least one topcoating layer (50) and/or the primer layer (70) each consist of one or a mixture of the following polymer materials: polyester, polyurethane(s), polyamide(s), vinyl alcohol(s), such as ethylene vinyl alcohol copolymer (EVOH) or polyvinyl alcohol copolymer (PVOH), ethylene acrylic acid copolymer(s) and/or polyacrylic acid copolymer(s).
  3. High barrier layer laminate according to one of the preceding claims, characterized in that the first polypropylene film (20) and/or the second polypropylene film (30) and/or the polypropylene support layer (80) is/are monoaxially oriented.
  4. High barrier layer laminate according to one of the preceding claims, characterized in that the first polypropylene film (20) and/or the second polypropylene film (30) and/or the polypropylene support layer (80) is/are biaxially oriented.
  5. High barrier layer laminate according to one of the preceding claims, characterized in that the first polypropylene film (20) and/or the second polypropylene film (30) and/or the polypropylene support layer (80) is/are designed as a non-oriented cast film.
  6. High barrier layer laminate according to one of the preceding claims, characterized in that the first polypropylene film (20) and/or the second polypropylene film (30) and/or the polypropylene support layer (80) each have at least one outer layer based on polyamide and/or EVOH.
  7. High-barrier layer laminate according to one of the preceding claims, characterized in that the Alubond layer (60) is an aluminum layer vapor-deposited onto the primer layer (70), which has on both sides a vapor-deposited aluminum oxide layer with a respective layer thickness of substantially 7% - 15%, preferably 8% - 12% and particularly preferably of approximately 10%, of a total layer thickness of the Alubond layer (60).
  8. High-barrier layer laminate according to one of the preceding claims, characterized in that the first polypropylene film (20) and/or the second polypropylene film (30) are each bonded to the high-barrier structure (40) by means of an adhesion promoter, in particular by means of an adhesive layer (90), wherein the polypropylene support layer (80) is preferably facing the second polypropylene film (30).
  9. High-barrier layer laminate according to one of the preceding claims, characterized in that the layer thicknesses of the individual layers or the application weights of the materials used for the individual layers are as shown in the following table: layer Layer thickness or application weight preferred layer thickness or preferred application weight particularly preferred layer thickness or particularly preferred application weight first polypropylene film(20) 10 - 40 µm 12 - 30 µm 16 - 25 µm second polypropylene film (30) 25 - 100 µm 30 - 80 µm 40 - 60 µm Topcoat layer (50) 0.3 - 2.0 g/ m² 0.5 - 1.3 g/ m² 0.8 - 1.1 g/ m² Alubond layer (60) 20 - 100 nm 30 - 50 nm 35 - 45 nm Primer layer (70) 0.3 - 2.0 g/ m² 0.5 - 1.2 g/ m² 0.7 - 1.0 g/ m² Polypropylene support layer (80) 10 - 40 µm 12 - 30 µm 16 - 25 µm Adhesive layer (90) 2.5 - 6.0 g/ m² 2.8 - 4.8 g/ m² 3.3 - 4.3 g/ m²
  10. High barrier laminate according to one of the preceding claims, characterized in that the high barrier laminate (10) has an oxygen permeability rate (OTR) of < 1.0 ccm/m 2 *day at a temperature of 23°C and a relative humidity of 50% both before and after sterilization, in particular autoclaving, at a temperature in the range of 121°C to 129°C.
  11. High barrier laminate according to one of the preceding claims, characterized in that the high barrier laminate (10) has a water vapor permeability (WVTR) of < 1.0 g/ m² *day at a temperature of 38°C and a relative humidity of 90% both before and after sterilization, in particular autoclaving, at a temperature in the range of 121°C to 129°C.
  12. High barrier structure (40), in particular for a sterilizable high barrier layer laminate (10) according to one of the preceding claims, characterized in that the high barrier structure (40), in particular in the following order, consists of at least one topcoating layer (50), an Alubond layer (60), a primer layer (70) and a polypropylene support layer (80) and optionally an outer layer made of a polymer, in particular polyamide and/or ethylene vinyl alcohol copolymer, applied to the polypropylene support layer, in particular by coextrusion.
  13. High-barrier structure according to Claim 12 , characterized in that the layer thicknesses of the individual layers or the application weights of the materials used for the individual layers are given in accordance with the following table: layer Layer thickness or application weight preferred layer thickness or preferred application weight particularly preferred layer thickness or particularly preferred application weight Topcoat layer (50) 0.3 - 2.0 g/ m² 0.5 - 1.3 g/ m² 0.8 - 1.1 g/ m² Alubond layer (60) 20 - 100 nm 30 - 50 nm 35 - 45 nm Primer layer (70) 0.3 - 2.0 g/ m² 0.5 - 1.2 g/ m² 0.7 - 1.0 g/ m² Polypropylene support layer (80) 10 - 40 µm 12 - 30 µm 16 - 25 µm
  14. Use of a high-barrier structure (40) according to one of the preceding Claims 12 until 13 for the production of a high-barrier layer laminate (10) according to one of the preceding Claims 1 until 11 .
  15. Use of a high barrier layer laminate (10) according to one of the preceding Claims 1 until 11 for the production of packaging.
  16. Packaging comprising a high-barrier laminate (10) according to one of the preceding Claims 1 until 11 .

Description

The invention relates to a sterilizable high-barrier laminate according to the preamble of claim 1, a high-barrier structure according to the preamble of claim 12, a use of such a high-barrier structure for producing the high-barrier laminate according to the preamble of claim 14, a use of such a high-barrier laminate for producing packaging according to the preamble of claim 15, and packaging comprising such a high-barrier laminate according to the preamble of claim 16. Sterilizable barrier laminates have been known in the art for some time, but they have numerous disadvantages. In conventional barrier laminates, a barrier effect, intended to ensure a high degree of impermeability of the laminate to oxygen and water vapor, is essentially achieved by incorporating a barrier layer structure consisting of a silicon oxide and/or an aluminum oxide layer into a composite of polymer films, from which packaging can then be manufactured. However, such barrier layer structures made of aluminum oxide and/or silicon oxide exhibit moderate flexibility and are prone to cracking, so that the load-bearing capacity of such laminates produced with such a barrier layer structure, or of packaging produced from them, is low. Furthermore, barrier layer laminates are known that have a metallic aluminum layer as a barrier, whereby the aluminum layer usually has a fairly large layer thickness of several micrometers, due to which such barrier layer laminates are no longer recyclable, making the reuse and/or further use of such a conventional barrier layer laminate impossible. If such a thick metallic aluminum layer is omitted in the latter barrier layer laminates, this leads to the fact that, firstly, the barrier effect of such a laminate is no longer present, and secondly, that such a laminate no longer has any light protection, which is extremely problematic, especially with regard to the light sensitivity of a product that is to be filled into packaging made from such a laminate, and sufficient product protection is then no longer guaranteed. The invention is based on the objective of providing a high-barrier laminate and a high-barrier structure that avoids the aforementioned disadvantages, wherein the high-barrier structure is suitable for use with the high-barrier laminate and the high-barrier laminate is suitable for manufacturing packaging, and furthermore, to provide packaging containing such a high-barrier laminate. This problem is solved by a sterilizable high-barrier laminate according to claim 1, by a high-barrier structure according to claim 12, by the use of such a high-barrier structure, in particular for the production of a high-barrier laminate, according to claim 14, and furthermore by the use of said high-barrier laminate for the production of packaging according to claim 15 and packaging with such a high-barrier laminate. In particular, this problem is solved by a sterilizable high-barrier layer laminate, especially for the production of packaging, comprising an outer first polypropylene film and an outer second polypropylene film arranged opposite the outer first polypropylene film, wherein at least one high-barrier structure is arranged between the first polypropylene film and the second polypropylene film, which consists, in particular in the following order, of at least one topcoating layer, an Alubond layer, a primer layer and a polypropylene support layer. A key aspect of the invention lies in the fact that a high-barrier structure with a specific layer sequence according to the invention is embedded between two polypropylene films, i.e., a first and a second polypropylene film, each arranged on the outside of the high-barrier layer laminate according to the invention. A central core of this high-barrier structure is formed by the Alubond layer, which is in the form of an extremely thin aluminum layer with a thickness in the range of a few nanometers, i.e., in the range of 20 nm to 100 nm, preferably in the range of 30 nm to 50 nm, and particularly preferably in the range of 35 nm to 45 nm, and which is surrounded on both sides by a similarly very thin layer of aluminum oxide in the lower nanometer range. Such a layer is embedded in the primer- The Alubond layer embedded in topcoat layers, as has been shown in the course of developing the present invention, has an exceptionally high barrier effect and, moreover, due in part to its extremely thin profile in the range of a few nanometers, extremely advantageous properties for use in and construction of a high-barrier layer laminate, wherein, according to the invention, this Alubond layer is embedded between further layers of the high-barrier layer laminate by means of a topcoat layer and a primer layer, and it has proven to be extremely advantageous if the functional Alubond layer is connected to a polypropylene support layer on the primer layer side. In terms of the process, the high-barrier layer laminate according to the invention can thus be produced, f