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Multilayer structure

A multi-layer structure, multi-layer film technology, applied in the direction of layered products, synthetic resin layered products, packaged food, etc., can solve problems such as reducing the possibility of product recycling

Pending Publication Date: 2021-12-24
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this sticky PP laminate contains incompatible ingredients, which reduces the recycling potential of such products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0113] The preparation method for the uniaxially oriented MD single-layer or multilayer film of the present invention at least includes forming a single-layer or multilayer film and with a stretch ratio of 1:1.5 to 1:12, preferably 1:2.0 to 1:10, More preferred is the step of stretching the resulting monolayer or multilayer film in the machine direction at a stretch ratio of 1:3.0 to 1:8.

[0114] The film is stretched in the machine direction to 1.5 to 12 times its original length. This is expressed herein as a stretch ratio of 1:1.5 to 1:12, ie "1" represents the original length of the film and "1.5" or "12" means the film has been stretched to 1.5 or 12 times the original length.

[0115] The effect of stretching (or pulling) is that the thickness of the film is likewise reduced. A stretch ratio of 1:1.5 or 1:12 therefore typically also means that the resulting film is 1 / 1.5 to 1 / 12 of the original thickness.

[0116] After orientation, the film thickness of the film form...

Embodiment

[0138] The following materials were used for the following experimental tests:

[0139] Material a) MFR 2 1g / 10min (230°C) polypropylene heterophasic copolymer

[0140] Material b) MFR 2 3g / 10min(190℃) and density 882kg / m 3 polyethylene plastic

[0141] Material c) MFR 2 3g / 10min (230°C) C3 / C2 / C4 polypropylene terpolymer

[0142] Material d) MFR 2 8g / 10min (230°C) polypropylene homopolymer

[0143] Material e) MFR 2 3g / 10min (230°C) polypropylene heterophasic copolymer

[0144] Material f) HMS-branched polypropylene copolymer SF313HMS, MFR 2 13g / 10min (230°C), provided by Borealis

[0145] BOPP – commercially available BOPP film

Embodiment 1

[0158] Invention Example 1 - IE1

[0159] In Table 4 are disclosed multilayer film structures of the present invention prepared by extrusion lamination. The same BOPP film as in CE3 was used as the BOPP film. A blown film of CE2 was used as the non-oriented layer. A branched PP of material f) was used as the core layer.

[0160] Table 4

[0161] Membrane structure CE2 Thickness / μm layer material Layer 1 20 BOPP Layer 2 10 f) Layer 3 80 CE2

[0162] The mechanical test results are disclosed in Table 5.

[0163] table 5

[0164]

[0165]

[0166] Looking at the results it can be seen that in the extrusion laminated structure of the present invention (IE1) compared to the blown film layer (CE2) the peak puncture force, total penetration energy, relative Elmendorf tear strength and tensile modulus were improved. That is, the BOPP film does not negatively affect these properties of the multilayer extrusion laminated structure co...

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Abstract

The present invention is directed to a multilayer structure. More specifically, the present invention is directed to a polypropylene multilayer extrusion laminate structure which provides sufficient thermal resistance and mechanical properties, and which multilayer structure can be recycled. The present invention is further directed to a process for producing the multilayer structure by an extrusion lamination process.

Description

technical field [0001] The present invention relates to a multilayer structure. More specifically, the present invention relates to a multilayer structure that provides sufficient heat resistance and mechanical properties and that can be recycled. The invention also relates to a method for producing said multilayer structure by means of an extrusion lamination process. Background technique [0002] Flexible packaging is a very resource-efficient way of product protection by combining different materials in the layers of a multi-layer structure, such as a multi-layer film. However, these types of multi-material multilayer structures, such as PET / PE or PET / PP combinations, present a challenge for the circular economy. Recycling, both mechanical and chemical, is demanding or difficult to achieve due to the poor quality of the recyclate. [0003] Multilayer structures are produced in different ways depending on the desired properties and requirements of the final product and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/035B32B27/08B32B27/32
CPCB32B27/08B32B7/035B32B27/32B32B27/327B32B2250/242B32B2307/306B32B2307/54B32B2307/518B32B2439/70B32B2439/80B29C48/21B29C48/0018B29K2023/12B29K2995/0053B32B2307/516B32B2307/5825B32B2553/00B65D65/40
Inventor 奥利·努米拉-帕卡里宁斯蒂凡·奥特纳彼得·尼德萨斯约瑟菲恩·斯瓦藤-林森
Owner BOREALIS AG
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