Multi-layered shrink films

A technology of shrink film and surface layer, applied in the direction of layered products, synthetic resin layered products, transportation and packaging, etc., can solve the problems of limited reduction, low modulus, etc.

Inactive Publication Date: 2014-08-27
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LDPE films have a low modulus, limiting the ability to reduce

Method used

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  • Multi-layered shrink films
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0050] The following examples illustrate the invention but are not intended to limit the scope of the invention.

[0051] Preparation of Ethylene-Based Polymer Compositions Used in the Examples of the Invention

[0052] Examples (Inv. Comp. Ex.) 1-3 of the inventive composition are ethylene-based polymer compositions prepared in a series of two-solution polymerization reactors under the conditions shown in Tables 1-3. Table 4 summarizes the catalysts and catalyst components referred to in Table 3. Example 4 of the inventive composition is an ethylene-based polymer composition prepared under similar conditions in a series of two solution polymerization reactors.

[0053] Table 1

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[0055]

[0056] Table 2

[0057]

[0058]

[0059] table 3

[0060]

[0061]

[0062] Table 4

[0063]

[0064] Various properties of Examples 1-4 of the compositions of the present invention are shown in Tables 5-14.

[0065] table 5

[0066]

[0067] Table 6 ...

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PUM

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Abstract

A multi-layered shrink film comprising: at least three layers including two skin layers and at least one core layer; wherein at least one layer comprises from 10 to 100 weight percent units derived from one or more ethylene-based polymer compositions characterized by having Comonomer Distribution Constant in the range of from 75 to 220, a vinyl unsaturation of from 30 to 100 vinyls per one million carbon atoms present in the backbone of the ethylene-based polymer composition; a zero shear viscosity ratio (ZSVR) in the range from at least 2.5 to 15; a density in the range of 0.924 to 0.940 g / cm3, a melt index (I2) in the range of from 0.1 to 1 g / 10 minutes, a molecular weight distribution (Mw / Mn) in the range of from 2.5 to 10, and a molecular weight distribution (Mz / Mw) in the range of from 1.5 to 4; and wherein the multi-layered film exhibits at least one characteristic selected from the group consisting of 45 degree gloss of at least 50%, a total haze of 15% or less, an internal haze of 8% or less, 1% CD Secant Modulus of 43,000 psi or greater, 1% MD Secant Modulus of 38,000 psi or greater, CD shrink tension of at least 0.7 psi, and / or MD shrink tension of at least 10 psi.

Description

technical field [0001] The present invention relates to multilayer shrink films. technical background [0002] For shrink film, downgauging is a trend in order to reduce cost and material consumption. However, in order to reduce the thickness of the shrink film, the film material must maintain high hardness to ensure the packaging speed and feel. In addition, shrink films are required to have excellent optical properties and transparency for consumer impression and market differentiation. Currently, film stiffness is improved by including a high density polyethylene (HDPE) component in LDPE based films at the expense of film clarity. Typically, films made from conventional low density polyethylene (LDPE) using high pressure free radical chemistry are also used due to their high shrinkage characteristics. However, LDPE films have a low modulus, limiting the ability to downsize. Summary of the invention [0003] The present invention is a shrink film. In one embodiment,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30C08L23/04B29C47/06B29C48/08
CPCB32B2250/40B29C47/06B32B2307/736C08L2203/16B32B27/30B29C47/0021B32B27/306C08L23/0815C08L23/04B32B27/08B32B27/32B32B2250/03B32B2250/242B32B2270/00C08L23/06C08L2205/025C08L2205/03B29C48/08Y10T428/2495Y10T428/24992Y10T428/31855Y10T428/31913Y10T428/3192
Inventor C.M.泰斯T.P.卡杰拉L.郝X.B.云C.吴
Owner DOW GLOBAL TECH LLC
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