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Multilayer films with tunable strain hardening

A multi-layer flow, core layer technology, applied in applications, layered products, home appliances, etc., can solve problems such as low impact strength

Active Publication Date: 2021-12-10
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional attempts to optimize film tensile strength and yield strength by blending polymers have produced films with increased yield strength but lower impact strength than films prepared from one component used in the blend

Method used

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  • Multilayer films with tunable strain hardening
  • Multilayer films with tunable strain hardening
  • Multilayer films with tunable strain hardening

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116] Table 2 below lists Comparative Sample A, which includes various layers comprising LLDPE but lacking LDPE, and Sample 1, which is an example of a multilayer film composition of the present invention. Specifically, Comparative Sample A included C encapsulated by layers including various LLDPE 6 - a core layer of LLDPE, while sample 1 includes a core layer of butene-LLDPE and LDPE encapsulated by layers of various LLDPEs. In comparative sample A and sample 1, layer A corresponds to the adhesive layer.

[0117]

[0118] Each of the films of Comparative Sample A and Sample 1 was produced on a multilayer cast film line according to the conditions provided for Example 1 in Table 1 above. Various tests were performed on each of the multilayer cast films, including puncture testing, tear resistance, dart impact and tensile elongation testing. The results are presented in Table 3. The results of the tensile yield and elongation tests were in figure 1 presented in .

[0...

example 2

[0123] Table 4 below lists Samples 2-5, which are examples of multilayer film compositions of the present invention. Specifically, samples 2-5 included LDPE in at least two different inner layers and included two different C 6 -LLDPE. Samples 2-5 include a single C 6 -LLDPE or two different C 6 - A core layer of LLDPE and excluding LDPE in the core layer. In samples 2-5, layer A corresponds to the adhesive layer.

[0124]

[0125] Each of the films of Samples 2-5 were produced on a multilayer cast film line according to the conditions provided for Example 2 in Table 1 above. Various tests were performed on each of the multilayer cast films, including puncture testing, tear resistance, dart impact and tensile elongation testing. The results are presented in Table 5. The results of the tensile yield and elongation tests were in figure 2 presented in .

[0126]

[0127] as in Table 5 and figure 2 As shown in , samples 2 (plot 202 ), 3 (plot 204 ), 4 (plot 206 ), ...

example 3

[0130] Table 6 below lists Comparative Sample B, which included various layers including LLDPE but lacking LDPE, various C in the core, encapsulant, and release layers. 6 - LLDPE and Comparative Sample C excluding LDPE, and Samples 6 and 7 which are examples of multilayer film compositions of the present invention. Samples 6 and 7 included LDPE in two separate inner layers and two different C 6 - LLDPE, and including a core layer (layer C), which includes two different C without LDPE 6 - Blends of LLDPE. In Comparative Samples B and C and Samples 6-7, Layer E corresponds to the adhesive layer.

[0131]

[0132] Each of the films of Comparative Samples B and C and Samples 6-7 were produced on a multilayer cast film line according to the conditions provided for Example 3 in Table 1 above. In each film, the adhesion was about a total of 1% in the structure. Thus, for a 10 μm thick film where the adhesion layer is 12% of the thickness, the adhesion at the adhesion layer is ...

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Abstract

The multilayer cast film includes an adhesive layer, a release layer, and at least one core layer disposed between and in contact with the adhesive layer and the release layer. The adhesive layer comprises ultra low density polyethylene (ULDPE), propylene interpolymer or blends thereof. The release layer includes a first linear low density polyethylene (first LLDPE) having a density of 0.915 to 0.938 g / cc and a melt index of 0.5 g / 10 min to 10 g / 10 min. Each of the core layers includes a second linear low density polyethylene (second LLDPE) having a density of 0.905 to 0.930 g / cc and a melt index of 0.5 g / 10 min to 10 g / 10 min. The multilayer cast film comprises from 3 wt% to 7 wt% of the low density polyethylene (LDPE), based on the total amount of polymer present in the multilayer cast film.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 62 / 450,772, filed January 26, 2017, the entire disclosure of which is hereby incorporated by reference. technical field [0003] Embodiments of the present disclosure relate generally to multilayer films, and in particular to multilayer films comprising LDPE. Background technique [0004] Multilayer films may include films such as cast or blown films, which may include silage wrap, stretch wrap, and surface protection films. Linear low density polyethylene (LLDPE) and / or high density polyethylene (HDPE) are widely used to produce multilayer films with high tensile strength and high impact strength. Conventional attempts to optimize film tensile strength and yield strength by blending polymers have produced films with increased yield strength but lower impact strength than films prepared from one component used in the blend . [0005] Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/32
CPCB32B27/08B32B27/32B32B2307/51B32B2405/00B32B2439/70B32B2307/72B32B2307/30B32B2250/242B32B2307/732B32B2250/03B32B2553/00B32B27/327B32B7/022B32B2307/54B32B2307/748B32B2307/558
Inventor E·L·李E·K·马R·M·帕特尔P·叶H-L·吴A·P·J·斯特约格罗
Owner DOW GLOBAL TECH LLC