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High modulus single-site lldpe

A gravimetric, high-density polyethylene technology for applications, home appliances, flat products, etc., which can solve problems such as low modulus

Active Publication Date: 2017-08-01
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, these polymers generally produce films with low modulus
Low modulus can be a disadvantage in some packaging applications, especially so called vertical form fill and seal packaging and stand up pouches
Additionally, "soft" films often feel thinner than films with a higher modulus, and this is viewed as a negative by many consumers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] This example illustrates the preparation of blown films using the sLLDPE and sHDPE-1 described above. All films of this example had a thickness of 2 mils. The films of the present invention also contain a nucleating agent (sold under the trademark HPN 20E by Milliken Chemicals). A total of 10 different blown films were prepared in this example. A first control film (1-C in Table 2) was prepared using 100% sLLDPE-1 and no nucleating agent. As shown in Table 2, the film has low values ​​for all four modulus tests (at 1% and 2% in both machine direction MD and transverse direction TD).

[0155] Films 2, 3 and 4 show the effect of adding sHDPE-1 to sLLDPE-1. The modulus values ​​of these films increased with increasing amount of sHDPE-1. These films are comparable in that they do not contain nucleating agents.

[0156] Inventive films 5-7 were prepared using masterbatches containing 1200 ppm nucleating agent (prepared with nucleating agent and sHDPE-1). The masterbatc...

Embodiment 2

[0163] The film in this example used the same linear low density polyethylene as used in Example 1 (sLLDPE-1). Film thicknesses are shown in Table 4 (1 mil or 2 mil).

[0164] However, a homopolymer was used as HDPE (sHDPE-2 as described above).

[0165] A masterbatch of sHDPE-2 and nucleating agent was used to prepare all films of this example. Masterbatches were prepared by melt mixing sHDPE-2 and nucleating agent in an extruder in an amount sufficient to provide a masterbatch containing 4 wt% nucleating agent. This masterbatch was then mixed with sLLDPE-1 in the amounts shown in Table 4 to prepare the film of this example.

[0166] The film of this example was produced on a blown film line in substantially the same manner as the film of Example 1.

[0167] However, the film of this example prepared using a low amount of high density resin contained a larger amount of nucleating agent (compared to a similar film of Example 1). As shown in Table 4, a further improvement w...

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Abstract

Linear low density polyethylene (LLDPE) that is prepared with a single site catalyst has relatively low modulus in comparison to a polyethylene of similar melt index and density made with a conventional Zeigler Natta catalyst. Films that are prepared from polyethylene having a low modulus have a soft and flexible feel, which is undesirable for some packaging applications. The present invention provides a method to increase the modulus of single site catalyzed linear low density polyethylene by mixing it with 10-2 wt. % of high density polyethylene and 200-10000 ppm of a nucleating agent.

Description

technical field [0001] Blends of single site catalyzed polyethylene with small amounts of high density polyethylene and nucleating agents provide films with improved modulus. Background technique [0002] There are two general types of polyethylene, namely, low density polyethylene (commonly referred to as "LD" polyethylene) prepared using free radical initiators in a high pressure process and linear polyethylene prepared with transition metal catalysts (commonly referred to as "linear" polyethylene). [0003] Linear polyethylene generally has superior physical properties compared to LD polyethylene. [0004] Conventional linear polyethylene is usually produced with Ziegler-Natta (Z / N) catalysts or chromium (Cr) catalysts. Such catalysts produce polymers with a relatively broad molecular weight distribution (MWD) and (in the case of copolymers) a relatively broad comonomer distribution. [0005] More recently, so-called "single-site" catalysts, such as metallocene catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06
CPCC08J5/18C08L23/0815C08L2205/24C08L2203/16C08J2423/06C08J2323/08C08L2207/062C08L23/06C08J2423/04C08L2314/06B29C48/10C08L2207/066B29C49/0005B29K2023/0625B29K2023/065B29L2007/008C08J2323/06C08L2205/025
Inventor N.博塞N.奥比P.S.克肖姆
Owner NOVA CHEM (INT) SA