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Multilayer stretch film with high adhesion and method thereof

A technology of adhesion layer and multi-layer flow, which is applied in the field of multi-layer stretched film, can solve the problems of expensive multi-layer film, impact on the total cost of stretched film, and pollution of process equipment, etc.

Active Publication Date: 2021-09-10
DOW GLOBAL TECH LLC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, films including these additives may have a higher cost compared to the base resin and may have a significant impact on the overall cost of stretched films
In addition, films including such additives may have one or more disadvantages such as 1) excessive noise when unwrapped from the film-roll when used on high speed coating machines, 2) must be aged for a period of time so that the additives are during migration to the membrane surface (i.e., occurs in large numbers), 3) contaminates process equipment, and 4) causes double-sided adhesion when one-sided adhesion is required
Additionally, when these additives are in liquid form and drip to inappropriate levels from process equipment, improper handling issues can arise
[0005] Multilayer films can also incorporate high levels of ethylene / α-olefin elastomers to achieve higher levels of tack or adhesion; however, ethylene / α-olefin elastomers can make multilayer films very expensive

Method used

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  • Multilayer stretch film with high adhesion and method thereof
  • Multilayer stretch film with high adhesion and method thereof
  • Multilayer stretch film with high adhesion and method thereof

Examples

Experimental program
Comparison scheme
Effect test

example

[0150] The resins used in the multilayer cast film are shown in Tables 2, 3 & 5. The propylene interpolymers of the present invention are propylene-ethylene copolymers and are prepared via the process in paragraphs [0018]-[0020] above. Additional properties of the propylene interpolymers are summarized in Table 3 below. PE resin 1 was produced via the method described below. Additional properties of PE Resin 1 and comparative polyethylene compositions are summarized in Table 5.

[0151] Table 2: Resin Properties

[0152]

[0153] Table 3: Resin Properties

[0154]

[0155] PE resin 1

[0156] PE Resin 1 was prepared as follows: A multimetallic catalyst (Catalyst 1) was prepared. Catalyst 1 is then used to prepare PE resin 1 polymerized in solution.

[0157] Catalyst 1 preparation

[0158] 7.76 kg of EADC solution (15% by weight in heptane) was added to about 109 kg of 0.20M MgCl 2 The slurry was then stirred for 8 hours. Then, add TiCl 4 / VOCl 3 (85mL and 14...

example 1

[0173]Three-layer cast films were produced using a Dolci 7-layer casting line with 5 extruders. The layer ratio of the adhesive layer was 12%, the layer ratio of the core layer was 76%, and the layer ratio of the release layer was 12%. The extrusion melt temperature was 251°C for extruder 1, 197°C for extruder 2, 253°C for extruder 3, 235°C for extruder 4, 181°C for extruder 5, and The mold temperature was 235°C. The output rate is 1,000 kg / h. The cooling roll temperature was 17°C. The air gap is 5ml. The film thickness was 25 microns. The membrane structure and membrane properties are further summarized in Table 6 below.

[0174] Table 6: Cast film structure

[0175]

[0176] As shown in Table 6, even if the amount of adhesive was reduced from 18% for Comparative Film 1 to 13% for Inventive Film 1, higher adhesion values ​​could be obtained.

example 2

[0178] Three-layer cast films were produced using a 5-layer casting line with 4 extruders. The layer ratio of the adhesive layer was 10%, the layer ratio of the core layer was 80%, and the layer ratio of the release layer was 10%. The melt temperature of the extruder ranges from 200°C to 250°C. The output rate is 860 kg / h. The mold temperature was 250°C. The air gap is 3 cm. Inventive Film 2 was produced using the following extruder pressures: 194 / 213 / 224 / 195 bar. Comparative Film 2 was produced using the following extruder pressures: 221 / 222 / 240 / 215 bar. The film thickness was 20 microns. The membrane structure and membrane properties are further summarized in Table 7 below.

[0179] Table 7: Cast film structure

[0180]

[0181] As shown in Table 1, the film 2 used in the present invention achieves higher adhesion values ​​in comparison to the comparative film 2 using other LLDPE resins in the adhesive layer, core layer and release layer. The polyethylene composit...

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Abstract

Embodiments disclosed herein include a multilayer film having an adhesive layer, a core layer, and a release layer, wherein the adhesive layer comprises a propylene interpolymer and the core layer comprises a core layer polyethylene composition.

Description

[0001] field of invention [0002] Embodiments of the present disclosure relate generally to multilayer stretch films, and more particularly to multilayer stretch films with high adhesion. Background technique [0003] Multilayer films are often used in packaging and can package different items, for example, bulk farm materials such as grass and hay to small grocery store items such as meat and vegetables. For all of these items, a stretchable, strong film with a sufficient level of tack or adhesion is generally required such that the film can be releasably adhered to itself and / or to the article covered by the film. [0004] Adhesion is one of the key performance requirements for stretch films. In order to achieve the desired level of adhesion, additives may be incorporated into the adhesion layer to improve the adhesion of the adhesion layer. However, films including these additives may have a higher cost compared to the base resin and may have a significant impact on the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32C08L23/14B32B27/08
CPCB32B27/08B32B27/32B32B2250/03B32B2250/242B32B2270/00B32B2274/00B32B2307/10B32B2307/54B32B2307/581B32B2307/582B32B2307/5825B32B2307/704B32B2307/72B32B2307/732B32B2307/748B32B2439/70C08L23/0815C08L23/14
Inventor M·G·D·奥利韦拉T·P·卡里亚拉M·比尔根J·C·戈梅斯M·扎内蒂M·A·莫拉诺尼阿姆皮拉J·M·罗德里格斯卡梅洛C·D·威莱G·A·雷蒙迪
Owner DOW GLOBAL TECH LLC