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Layered films, packages prepared therefrom, and methods of making the same

A single-layer film, inner layer technology, applied in chemical instruments and methods, packaging, packaged food, etc., can solve the problems of improving hot viscosity, no teaching, no teaching core layer, etc.

Active Publication Date: 2009-12-30
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, none of these references teach having a thin core layer (which has a different modulus than the thicker skin layers, or is made of a material with a different modulus relative to the thicker skin layers) and is primarily used for blow molding. multilayer film
Furthermore, none of these references teach improved hot tack, gloss, and haze in combination with increased modulus and / or tear (with a hard core), or in combination with increased dart drop and / or Tear-resistant (softer core) films

Method used

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  • Layered films, packages prepared therefrom, and methods of making the same
  • Layered films, packages prepared therefrom, and methods of making the same
  • Layered films, packages prepared therefrom, and methods of making the same

Examples

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Embodiment 5

[0294] Example 5 is a film similar to Example 2, but in which layer B is made of PE815 (octene-1 comonomer, I 2=0.5dg / min, density=0.868g / cc). Example 5 has improved dart impact, gloss, improved haze, improved MD tear and has a slightly lower modulus relative to Comparative Example 1. In Example 3, Layer B was a 50 / 50 blend of PE19 and PE815. Example 3 has improved gloss and haze and MD tear over Comparative Example 1 which has a similar modulus. In Example 4, Layer B was formed of PP24, and the film had improved properties (impact, optical, tear) compared to Comparative Example 1. In Example 6, the inner layer B was formed of random polypropylene copolymer PP2N, and the film had improved modulus, tear in two directions, and optical properties relative to Comparative Example 1. Example 8 (five layer film) also shows improved properties relative to Comparative Example 1.

[0295] Another comparative example (comparative example 9) has three layers, and these three layers ar...

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PUM

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Abstract

The invention provides a film comprising at least three layers, and wherein at least one layer is a inner layer with a thickness of 20 percent or less of the total thickness of the film, and wherein said inner layer, or a polymer component used to form said inner layer has one of the following properties: A) a MD tensile, 2 percent secant modulus at least two times higher than the MD tensile, 2 percent secant modulus of a skin layer, or B) a MD tensile, 2 percent secant modulus at least five times lower than the MD tensile, 2 percent secant modulus of a skin layer, and where the inner layer, or at least one polymer component of the inner layer, has one of the following properties: C) a melt index, I2 (190 DEG C / 2.16kg) of less than, or equal to, 2 g / 10 min, or D) a melt flow rate, MFR (230 DEG C / 2.16 kg) of less than, or equal to, 5g / 10 min. The invention also provides for articles prepared from the inventive films and for methods of making the same.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Spanish Patent Application 200603242, filed December 21, 2006, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a multilayer film comprising at least three layers, and wherein the thickness of the inner layer of the film accounts for 20% or less of the total thickness of the film, and wherein the inner layer has a ) layers with different moduli, or the inner layer is made of a polymer with a different modulus than the outer (skin) layer. Background technique [0004] Films are used in numerous packaging applications such as industrial packaging, food packaging and specialty packaging. For these packages, it is desirable that the film forming the package has a combination of properties such as dart impact resistance, tear resistance, film stiffness, good sealing ability and good optical properties. Good seal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/00B32B27/32B32B7/02B32B1/00B32B7/022
CPCB32B7/02B32B27/00B32B27/32B32B27/06B32B27/306B32B27/34B32B27/36B32B2439/00Y10T428/2495Y10T428/24942Y10T428/1352Y10T428/31504B32B7/022
Inventor 杰瑟斯·尼托卡罗拉·罗森塔尔尼马丁
Owner DOW GLOBAL TECH LLC