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Matt polyolefin film having release properties

A technology of polyolefin film and polyethylene, applied in the field of matt polyolefin film, can solve problems such as limitations in visual design choices

Active Publication Date: 2015-04-01
TREOFAN GERMANY GBMH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Visual design options are therefore extremely limited when using cold seal adhesives for packaging

Method used

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  • Matt polyolefin film having release properties
  • Matt polyolefin film having release properties
  • Matt polyolefin film having release properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] A transparent three-layer film comprising a base layer B and an inner and an outer cover layer with a total thickness of 20 μm was produced by coextrusion followed by sequential longitudinal and transverse orientation. The thickness of the outer matte cover layer is about 2 μm and the thickness of the inner cover layer is about 0.6 μm.

[0094] B base layer

[0095] ~99.88% by weight propylene homopolymer with a melting point of 165°C and a melt flow index of 3.4 g / 10 minutes and a n-heptane soluble fraction of 94%

[0096] ~0.12% by weight N,N-bis-ethoxyalkylamine (antistatic agent)

[0097] External cover: (anti-stick layer)

[0098]

[0099] Inner covering:

[0100]

[0101] All layers also contained conventional amounts of neutralizing and stabilizing agents.

[0102] The preparation conditions in each process step are:

[0103]

[0104]

[0105] The surface of the outer cover layer undergoes surface treatment in a corona process. After this treatm...

Embodiment 2

[0107] Membranes were prepared as described in Example 1. In contrast to Example 1, an ethylene-propylene copolymer having an ethylene content of 4% by weight (relative to the copolymer ), and a melting point of 135° C.; and a melt flow index of 7.3 g / 10 minutes at 230° C. and a load of 2.16 kg (DIN EN ISO 1133). The other composition and process conditions as well as the corona treatment were unchanged in the preparation of the film. The film of this example has a roughness Rz of 3.3 μm on the surface of the matt cover layer.

Embodiment 3

[0109] Membranes were prepared as described in Example 1. In contrast to Example 1, the film was also flame treated on the surface of the inner cover layer. The other composition and process conditions as well as the corona treatment were unchanged in the preparation of the film.

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Abstract

The invention relates to transparent multilayer biaxially oriented polyolefin films comprising a base layer and at least one outer matt covering layer, which contains at least two incompatible polymers and has a surface roughness of at least 2.0 [mu]m. The covering layer contains a polydialkyl siloxane having a viscosity of 100,000 to 500,000 mm2 / s. The surface of said covering layer is pre-treated by means of corona.

Description

technical field [0001] The present invention relates to matt polyolefin films having good release properties, especially for cold seal adhesives. Background technique [0002] Food and other packaged items are often shrink-wrapped in packaging film, in which case high temperatures, typically above 100°C, must be used in order to produce a sealed seam. In high speed packaging machines it sometimes happens that there is not enough time to transfer the heat necessary to seal the package. For this application, a cold seal adhesive is used which is applied in thin layers and only in the region of the sealing seam. The cold seal adhesives are adjusted so that they can be bonded even at room temperature and under pressure. [0003] The cold seal adhesive is preferably applied immediately after the film is printed. Once the films or composite films have been printed and coated with a cold seal adhesive, they are stored in roll form until their need to be used. During storage, st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/32C08J5/18
CPCB32B27/283B32B27/08B32B2310/14B32B38/0008B32B2307/518B32B37/153B32B27/18Y10T428/24364B32B2553/00B32B27/32B32B27/20B32B2307/412B32B27/16B32B2038/0028B32B7/06B32B7/12B32B2250/24B32B2307/406B32B2307/408B32B2307/41B32B2307/538B32B2307/732B32B2307/75
Inventor 德特勒夫·胡特
Owner TREOFAN GERMANY GBMH & CO KG