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Collation shrink film

A shrink film, range technology, applied in one step to one field, can solve the problems such as the risk of increasing the formation of holes due to the non-uniformity of pollutants

Active Publication Date: 2021-11-16
BOREALIS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inhomogeneity in contamination from initial use, collection and recycling of flexible materials increases the risk of void formation in ovens such as shrink ovens

Method used

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  • Collation shrink film

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Embodiment Construction

[0018] definition:

[0019] In the gist of the present invention, the term "multimodal" may mean multimodal with respect to the molecular weight distribution and thus also include bimodal polymers. However, as explained in the detailed description of the components, the components may also be multimodal with respect to other properties, such as MFR or density.

[0020] Generally, a polymer composition comprising at least two polyethylene fractions produced under different polymerization conditions resulting in different (weight average) molecular weights of the fractions is said to be "multimodal". and molecular weight distribution. The prefix "multiple" relates to the number of different polymer fractions present in the polymer. Thus, for example, the term multimodal polymer includes so-called "bimodal" polymers consisting of two fractions. The form of the molecular weight distribution curve for a multimodal polymer such as LLDPE, i.e. the appearance of a plot of the polym...

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Abstract

The present invention relates to a multilayer collation shrink film comprising at least the following layers: A) a layer comprising at least the following components: a1) a multimodal polymer of ethylene with at least two different comonomers selected from alpha-olefins having from 4 to 10 carbon atoms, which multimodal polymer of ethylene has a density in the range from 910 to 935 kg / m<3>, and a Mw / Mn of 2 to 8; a2) a multimodal terpolymer of ethylene and two alpha olefin comonomers, with the multimodal terpolymer having a density in the range from 930 to 950 kg / m<3> and a Mw / Mn of 10 to 20; and a3) LORE; B) a layer comprising at least the following components: b1) recycled LORE; and b2) a multimodal terpolymer of ethylene and two alpha olefin comonomers, with the multimodal terpolymer having a density in the range from 930 to 950 kg / m<3> and a Mw / Mn of 10 to 20. The present invention relates further to a method for manufacturing the film according to the present invention and to the use of the film for secondary packaging.

Description

technical field [0001] The present invention relates to a multilayer collation shrink film comprising at least two layers, for example at least three layers, wherein at least one layer A) comprises at least a1) a specific multimodal polymer of ethylene, a2) ethylene and a3) LDPE, and at least one layer B) comprises at least b1) the specified multimodal terpolymer of cyclic LDPE and b2) ethylene. The invention further refers to a method for producing such a multilayer film and its use in the field of secondary packaging. Background technique [0002] Attempts to manufacture new products using polymers obtained from waste materials are gaining more and more attention and importance these days for ecological reasons and in order to reduce costs. Due to the growing environmental problems caused by plastics, the focus today is on the recycling of these plastics. [0003] Secondary packaging, such as collation shrink film, does not require food approval and a large amount of rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/18B32B27/20B32B27/32
CPCB32B27/08B32B27/18B32B27/20B32B27/32B32B2250/242B32B2250/40B32B2270/00B32B2272/00B32B2307/30B32B2307/40B32B2307/54B32B2307/72B32B2307/734B32B2307/736B32B2553/00B29C48/0017B29C48/08B29C48/18B32B2323/04B32B2323/046B29C48/21
Inventor 尚塔尔·赛玛奥利·纽姆米拉-帕卡瑞恩克里斯蒂安·戈茨洛夫
Owner BOREALIS AG
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