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Multilayer films prepared from blends of high-impact polyethylene and Ziegler-Natta-catalyzed polyethylene and high-pressure low-density polyethylene

A polyethylene and multi-layer film technology, which is applied in the direction of synthetic resin layered products, layered products, transportation and packaging, etc., can solve the problems of impact strength loss and low impact strength, etc.

Active Publication Date: 2017-07-28
NOVA CHEM (INT) SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Indeed, loss of impact strength is especially problematic when blending LD polyethylene with metallocene-catalyzed polyethylene having a density of about 0.915-0.930 g / cc (since the high impact strength of the lower density metallocene polyethylene are more tolerated and are generally not used in film applications where impact strength is important because higher density metallocene resins have inherently lower impact strength)

Method used

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  • Multilayer films prepared from blends of high-impact polyethylene and Ziegler-Natta-catalyzed polyethylene and high-pressure low-density polyethylene
  • Multilayer films prepared from blends of high-impact polyethylene and Ziegler-Natta-catalyzed polyethylene and high-pressure low-density polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Polyethylene

[0059] HI polyethylene has a melt index I of 0.65 g / 10 minutes 2 ; Density of 0.916g / cc; and SCBDI greater than 70. It is a trademark of NOVA Chemicals Ethylene-octene copolymer sold by FPS016. The MatWeb Internet website reports a standardized impact strength of 711 / g / mil, which can be considered a typical value for a blown film with a thickness of 1 mil made from the HI polyethylene.

[0060] LD polyethylene is an ethylene homopolymer, which has a melt index of 2.3 and a density of 0.919. LF 0219 A is sold.

[0061] ZN polyethylene is an ethylene-butene copolymer, which has a melt index of 0.8 g / 10 minutes and a density of 0.921 g / cc, sold by NOVA Chemicals under the brand name NOVAPOL PF-Y821-CP. The standardized impact strength of the film prepared from this polyethylene is reported on the MatWeb Internet website as 94 g / mil, which can be considered typical.

[0062] experiment method

[0063] According to ASTM D1709 / A(F 50 Standard) The impact strength ...

Embodiment 1

[0068] Example 1 The film was manufactured on a three-layer co-extruded film production line manufactured by Brampton Engineering. A blow up ratio (BUR) of 2.5 / 1 was used to prepare a three-layer film with a total thickness of 3 mils.

[0069] The A-B-C structures of these three-layer films are described in Table 1 in more detail. For the sake of clarity: the film 4 of the present invention has an A / B / C layer with a ratio of 20 / 60 / 20 (meaning that the surface layers A and C each contain 20% by weight of the total polyethylene, and the core layer B contains 60% by weight) . The surface layers (A and C) are each made of HI polyethylene, and the core layer is made of a blend of 90% ZN + 10% LD.

Embodiment 2

[0070] Example 2 A five-layer film was prepared on a blown film line fed by five extruders. The structure of A / B / C / D / E is clearly defined in Table 2. The film has a thickness of 3.5 mils and is prepared using 2.5 / 1 BUR.

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PUM

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Abstract

Multilayer films are prepared from high impact strength polyethylene (HI polyethylene), Ziegler Natta catalyzed polyethylene (Z / N polyethylene) and high pressure low density polyethylene (LD polyethylene), and the multilayer film The following requirements are present: i) at least one skin layer consists essentially of HI polyethylene, and ii) at least one core layer comprises a blend of Z / N polyethylene and said LD polyethylene. HI polyethylene has a density of about 0.915-0.930 g / cc and a normalized impact strength of at least 300 g / mil. The amount of HI polyethylene is 30-55% by weight (based on the combined weight of HI+ZN+LD polyethylene). The films of the present invention are easily produced on blown film equipment and offer a good balance of mechanical properties.

Description

Technical field [0001] The invention relates to a multilayer plastic film. Background technique [0002] Polyethylene film is widely used in many packaging applications. [0003] The first commercially available type of polyethylene was prepared under high pressure using free radical initiators. This type of polyethylene is commonly referred to as high pressure / low density polyethylene and "LD" polyethylene. LD polyethylene is easy to process, but the monolayer film prepared with LD polyethylene has relatively poor mechanical properties. [0004] Using Ziegler Natta catalysts can produce ethylene copolymers with better mechanical properties than LD polyethylene-but these copolymers are more difficult to process than LD polymers. [0005] Recently, the use of metallocene catalysts can produce ethylene copolymers with enhanced impact strength (but again at the expense of poor processability compared to LD polyethylene). [0006] The use of polyethylene blends to prepare single layer fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/32B29C48/21B29C48/49B29C48/92
CPCB32B2439/00B32B2250/242B32B2270/00B32B2307/558B32B2307/72B32B2439/70B32B27/00B32B27/08B32B27/327B32B2307/31B32B2307/514B32B2307/58B32B2307/5825B32B2307/7265B32B2307/732B32B27/32Y10T428/31913B29C48/10B29C48/21B29C48/49B29C48/92B29C2948/92647B29C2948/92942
Inventor N·博尔斯N·D·J·奥比P·S·基斯霍姆S·K·戈亚尔J·M·马勒
Owner NOVA CHEM (INT) SA
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