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Ultra-stiff coextruded shrink films

A shrinking layer and stiffening technology, applied in the field of multilayer films, can solve the problems of unfavorable realization of other properties, modulus increase, etc.

Inactive Publication Date: 2015-07-01
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This dramatic increase in modulus cannot be achieved with known resins combined with existing formulations and existing 3-layer coextrusion techniques
While converters currently attempt to increase modulus by increasing the content of stiff resins (mainly HDPE and occasionally PP), this approach has limitations in terms of minimizing resin usage and detrimentally achieving other properties

Method used

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  • Ultra-stiff coextruded shrink films
  • Ultra-stiff coextruded shrink films
  • Ultra-stiff coextruded shrink films

Examples

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example

[0049] The following resins were used to make films to demonstrate the effectiveness of the invention:

[0050] Resin A has 0.935g / cm 3 LLDPE with density, melt index of 1.7g / 10min and MWD of 3.4.

[0051] Resin B has 0.935g / cm 3 LLDPE with density, melt index of 0.5g / 10min and MWD of 3.1.

[0052] Resin C has 0.925g / cm 3 A high-pressure low-density polyethylene resin with a density of 1g / 10min and a melt index of 1g / 10min.

[0053] Resin D has 0.960g / cm 3 A linear high-density polyethylene resin with a density of 0.29g / min and a melt index of 0.29g / min.

[0054] Resin E has 0.956g / cm 3 A linear high-density polyethylene resin with a density of 2 g / min and a melt index of 2 g / min.

[0055] Resin F has 0.955g / cm 3 A linear high-density polyethylene resin with a density of 4g / min and a melt index of 4g / min.

[0056] Resin G has 0.926g / cm 3 A high-pressure low-density polyethylene resin with a density of 0.3g / 10min and a melt index of 0.3g / 10min.

[0057] The resins we...

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Abstract

The present invention generally pertains to multilayer film including four or more discrete layers. The films contain two external layers, an internal stiffening layer and an internal shrink layer. The external layers include linear low density polyethylene resin, the stiffening layer includes polypropylene or a high density polyethylene and the shrink layer includes low density polyethylene. The multilayer films of the present invention have a gloss of at least 62% at 45 degrees, together with a 2% secant tensile modulus greater than 400 MPa.

Description

technical field [0001] The present invention generally relates to multilayer films comprising four or more discrete layers. The film contains two outer layers, an inner stiffening layer and an inner shrink layer. The outer layer comprises a linear low density polyethylene resin, the stiffening layer comprises polypropylene or high density polyethylene, and the shrink layer comprises low density polyethylene. The multilayer film of the present invention is characterized by having a gloss of at least 62% at 45 degrees, and a 2% secant tensile modulus greater than 400 MPa. Background technique [0002] Currently, the best performing shrink films for demanding proofreading applications are manufactured by a blown film process and typically contain 3 layers. The two skin layers are usually based on a blend of mostly LLDPE (usually mLLDPE) with LDPE. The center layer typically contains partially fused MI LDPE occasionally blended with HDPE. There has been an increased demand f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B7/02
CPCB32B27/32B32B7/02Y10T428/24992B32B27/08B32B2250/242B32B2270/00B32B2307/406B32B2307/54B32B2307/5825B32B2307/736B32B2439/00B32B2439/02B32B2439/40
Inventor M·帕弗里克
Owner DOW GLOBAL TECH LLC
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