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Low temperature multilayer shrink film, and method of making the same

A shrink film and surface layer technology, applied in the field of polyethylene-based shrink film, which can solve problems such as deformation of PET bottles

Active Publication Date: 2022-07-19
DOW GLOBAL TECH LLC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, higher shrink tube temperatures can cause deformation of the PET bottle at the headspace

Method used

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  • Low temperature multilayer shrink film, and method of making the same
  • Low temperature multilayer shrink film, and method of making the same
  • Low temperature multilayer shrink film, and method of making the same

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[0139] The resins used in the films are shown in Table 1 below. Additives used include Polymer Processing Aid ("PPA"), AMPACET TM 102823 BA, Slip Agent ("Slip"), AMPACET TM 901021 BX; and Anti-Blocking Agent ("AB"), AMPACET TM 901300 BX.

[0140] Table 1 - Resins

[0141]

[0142] All resins except Inventive Resin 1 were purchased from The Dow Chemical Company of Midland, MI.

[0143] Inventive resin 1 can be prepared by purifying all starting materials (monomers and comonomers) and process solvent (narrow boiling range high purity isoparaffinic solvent, Isopar-E) with molecular sieves prior to introduction into the reaction environment. Hydrogen is supplied in high purity grades and is not further purified. The reactor monomer feed stream is pressurized to greater than the reaction pressure via a mechanical compressor. The solvent and comonomer feeds are pressurized above the reaction pressure via a pump. Individual catalyst components were manually batch diluted...

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Abstract

A multilayer shrink film comprising at least one core layer between a first skin layer and a second skin layer wherein the multilayer shrink film comprises an ethylene / α-olefin interpolymer composition and a low density polyethylene.

Description

technical field [0001] Embodiments of the present disclosure relate generally to polyethylene-based shrink films, and more particularly, to polyethylene-based shrink films having improved shrinkage at low temperatures, and methods of making the same. Background technique [0002] Shrink wrapping generally involves wrapping an article in shrink film to form a package, and then heat shrinking the film by exposing the film to sufficient heat to induce shrinkage and intimate contact between the film and the article. Heat can be provided by conventional heat sources such as hot air. Conventional shrink films exhibit shrinkage at 140°C. However, in order to achieve such shrinkage temperatures, the shrinkage channels need to operate at elevated temperatures. In some applications, such as pharmaceutical applications, high temperatures may adversely affect heat-sensitive products. Additionally, higher shrink tube temperatures can cause deformation of the PET bottle at the headspac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/12B32B27/08B32B27/20B32B27/32
CPCB32B27/08B32B27/20B32B27/32B32B27/327B32B2250/03B32B2250/04B32B2250/05B32B2250/242B32B2250/40B32B2270/00B32B2307/736B32B2307/746B32B2439/06B32B2439/46B32B2439/70
Inventor K·古普特E·L·李M·G·D·奥利韦拉R·M·帕特尔G·A·雷蒙迪P·莎阿M·扎内蒂
Owner DOW GLOBAL TECH LLC