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Polyethylene with polyethylene glycol with increased environmental stress crack resistance

A technology resistant to environmental stress and polyethylene glycol, which can be used in applications, household appliances, and other household appliances, and can solve problems such as high cost

Active Publication Date: 2021-01-15
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although various methods exist to improve the ESCR properties of polyethylene, many of these methods are compromised because they are costly or are only applicable to methods of making starting polyethylene materials rather than existing polyethylene materials

Method used

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  • Polyethylene with polyethylene glycol with increased environmental stress crack resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] PEG with a MW of 20000 (ie, PEG-20000) was dry-blended with commercially available HDPE in different amounts ranging from 2.5 wt% to 15 wt% as powder or flakes. The HDPE used is HDPE CC253 and HDPECC254. HDPE CC253 is a unimodal HDPE with an MFR of 1.8dg / min and a density of 952kg / m at 190°C and 2.16kg 3 . HDPE CC254 is a bimodal HDPE with an MFR of 2.1dg / min and a density of 953kg / m at 190°C and 2.16kg 3 . For comparison, pure HDPE without any PEG-20000 and HDPE with low molecular weight PEG (ie PEG-1500, MW=1500) were also tested. The different mixtures were fed into the hopper of a ZSK-25 mm six-barrel twin-screw extruder with an L / D ratio of 25:1. The run parameters used are listed in Table 1 below:

[0051] Table 1

[0052] Barrel-1 (connected to the hopper) Temperature = 160°C Barrel-2 Temperature = 185°C Barrel-3 Temperature = 195°C Barrel-4 Temperature = 195°C Barrel-5 Temperature = 200°C Barrel-6 (die) ...

Embodiment 2

[0055] The pellets obtained after melt extrusion of Example 1 were compression molded at a temperature of 195° C. to 210° C. into a sheet with a thickness of 1.85 mm to 1.95 mm, and the holding time was 5 min and the cooling time was 5 min. There were no clearly visible inhomogeneities in the compressed tablets. The ESCR performance of the compression molded sheets (both neat and formulated HDPE) was then evaluated according to ASTM D 1693-15B (Bell Test).

[0056] The compression molded sheet was cut into test specimens with a length of 38 mm and a width of 13 mm. A notch of 0.5 mm depth was made at the center of each test sample, after which it was stored in a conditioned environment at 23° C. and 55% RH humidity. The conditioned sample is subjected to a U-bend with the aid of a clamp. For each of the pure and formulated HDPE materials, 10 bent samples were placed on aluminum sample holders, followed by a sample filled with Igepol CO-630 (nonylphenoxypoly(ethyleneoxy)ethan...

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Abstract

A polyethylene composition having increased environmental stress crack resistance (ESCR) is comprised of a polymer blend of a high density polyethylene (HDPE) and polyethylene glycol (PEG). The PEG ispresent in the polymer blend in an amount of from 0.5 wt.% to 15 wt.% by total weight of the polymer blend. The PEG may have an average molecular weight of from 2000 to 40,000. In a method of forminga polyethylene composition having increased ESCR, a HDPE is modified by combining the HDPE with PEG in a polymer blend, the PEG being present in an amount of from 0.5 wt.% to 15 wt.% by total weightof the polymer blend. The polymer blend can be formed into an article of manufacture, such as a bottle cap.

Description

technical field [0001] The present invention relates to high density polyethylene compositions having improved environmental stress crack resistance. Background technique [0002] Synthetic polymeric materials, especially thermoplastic resins, are widely used in the manufacture of various end-use articles ranging from medical devices to food containers. Conventional propylene polymer materials have long been used in processes such as thermoforming, blow molding, coating, etc., requiring high melt strength that can be achieved by increasing molecular weight and broadening molecular weight distribution. Molecular weight and molecular weight distribution can be varied during the polymerization process itself by selection of specific process conditions and catalysts. [0003] Polypropylene (PP) has been widely used to produce caps and covers. But to achieve the required cap strength, an inner liner (for example made of ethylene vinyl acetate (EVA), polyvinyl chloride (PVC), bu...

Claims

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Application Information

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IPC IPC(8): C08L23/04
CPCC08L23/04C08L2203/30C08L2207/062C08L2666/14C08L71/02B29D99/0096C08J3/005C08L23/06C08L2205/025C08L2205/03
Inventor A·丹巴兰M·索利曼
Owner SABIC GLOBAL TECH BV
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