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Polyolefin based peelable seals

A sealing layer, polyethylene technology, applied in the manufacture and use of the heat sealable, peelable sealing field, can solve the problem of ionomers being more expensive

Active Publication Date: 2008-10-08
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, ionomers are generally more expensive and may also have some odor

Method used

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  • Polyolefin based peelable seals
  • Polyolefin based peelable seals
  • Polyolefin based peelable seals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1 - The first series of constructions is an A / B / C construction where layer A includes a 0.7 mil nylon backing layer and layer B is a 0.7 mil tie layer made of 85% ATTANE4202 Ultra Low density polyethylene (I 2 3.2, density 0.913g / cc) and AMPLIFY GR205 functional polymer (maleic anhydride grafted polyethylene, density 0.962, I 2 is 2.0) blending composition, and layer C is a 2.1 mil sealant layer, as shown in Figure 1. The structure was sealed at the indicated temperature using an atmospheric pressure of 40 psi and a dwell time of 0.5 seconds. Seal strength was measured by pulling from the seal at a 90° angle using an Instron tensile tester at a crosshead speed of 10 inches per minute 24 hours after the seal was welded.

Embodiment 2

[0057] Example 2 - A second series of structures were prepared in an A / B structure where layer A was a 1.7 mil layer comprising gas phase HDPE having a density of 0.961 and I 2 is 0.85, and layer B is a 0.3 mil sealant layer as shown in Figure 2. The seal strength of these structures was determined as described above over the sealing temperature range shown in FIG. 2 .

Embodiment 3

[0058] Example 3 - A third series of structures were prepared and tested for seal strength. An A / B structure was prepared in which layer A was a 50 micron RCP backing layer and layer B was a 10 micron thick layer made of a blend of 95% by weight Resin F and 5% by weight Resin J. A second A / B structure was prepared using the same method, except layer B was a blend of 95% Resin E and 5% Resin J. At the different temperatures shown in Figure 3, using 0.5N / mm 2 The structure was sealed to a 750 micron homopolymer polypropylene sheet with a pressure of 2 seconds and a dwell time of 2 seconds. Seal strength was measured by pulling from the seal at a 90° angle using an Instron tensile tester at a crosshead speed of 100 mm / min, after at least 24 hours of sealing. The result is shown in Figure 3. Typical seal strength values ​​in the range of 2 to 10 N / 15 / mm obtained in the temperature range of 120 to 160° C. show the application of the present invention. Furthermore, when the seal...

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Abstract

The invention relates to a polyolefin-based heat sealable and peelable seal. The peelable seals comprise from 5 to 98 percent by weight of a propylene based plastomer or elastomer and from 2 to 95 percent by weight of a second polymer selected from the group consisting of polyethylene, polybutylene, and styrenic polymer and mixtures thereof. The invention also relates to tamper evident peelable seals. The invention also relates to methods of making and using the heat sealable, peelable seal.

Description

technical field [0001] The present invention relates to polyolefin based heat sealable and peelable seals. The invention also relates to peelable seals where the reflective layer is tamper evident. The invention also relates to methods of making and using such heat-sealable, peelable seals. Background technique [0002] Heat sealable and peelable films (also referred to herein as "peelable seals") are used on a large scale to temporarily seal containers including, for example, food or medical equipment. During use, the consumer opens the package by separating the heat-seal layer of the peelable film. Several properties related to heat sealable and peelable films are required in order to gain consumer acceptance. For example, the film should provide a leak-proof seal for the container or bag. To seal the bag, heat sealing is usually used. A variety of devices are manufactured for forming the pack while filling the pack with the desired contents. These devices are common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08L23/16C08L23/04B32B27/32
CPCC08J2323/16C08J2325/04B32B27/08B32B27/306C08L23/16B32B25/08B32B7/06C08L23/04C08L23/10C08J2323/04C08J2323/10B32B2270/00C08J5/18B32B2581/00B32B27/302B32B27/32B32B2307/582C08L2666/06
Inventor J·W·吉本斯A·J·威廉斯R·M·帕特拉J·伍斯特E·托雷斯M·A·普莱托高伯特O·伯特朗
Owner DOW GLOBAL TECH LLC