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Polyethylene with additives for increased environmental stress crack resistance

An environmental stress cracking and additive technology, applied in the field of high-density polyethylene compositions

Pending Publication Date: 2021-07-23
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, reducing cap weight from 3g to 1.8-2.0g (as many brands are currently demanding) while maintaining its ESCR performance is a new challenge

Method used

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  • Polyethylene with additives for increased environmental stress crack resistance
  • Polyethylene with additives for increased environmental stress crack resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Application of different main additives to improve the ESCR performance of multimodal HDPE (HDPE-1 and HDPE-2) with a melt flow rate of 0.6–0.8 dg / min measured according to the ISO 1133 method at 190°C and a load of 2.16Kg , The density measured by ASTM D1505 or ISO 1872 method is 953-955Kg / m 3 , The tensile modulus measured according to the ISO 527-2 method is 1100-1200MPa, the yield tensile strength measured according to the ISO 527 1&2 method is 20-28MPa, and the izod notched impact strength measured according to the ISO 180 / A method at 23°C 8-12kJ / m 2 and a Charpy impact strength of 8-10kJ / m measured at 23°C according to the ISO 179 method 2 .

[0071] The applied HDPE-1 and HDPE-2 include Laboratory grade multimodal HDPE and INEOS CAP 602 multimodal HDPE. Primary additives include Septon by Kuraray America, Inc. TM Hydrogenated styrene block copolymers of styrene-ethylene-ethylene-propylene-styrene (SEEPS) obtained from Kraton Polymers as Kraton D TM Styrene...

Embodiment 2

[0076] The granules obtained after melt extrusion in Example 1 were compression molded at a temperature of 195-210° C. into a sheet with a thickness of 1.85-1.95 mm, and the holding time was 5 minutes and the cooling time was 5 minutes. No significant visual non-uniformity was seen in the compression molded sheet. Then according to ASTM D1693-15B method (Bell test) to evaluate the ESCR performance of pure HDPE and compression molded sheet of HDPE.

[0077] The compression molded sheet was cut into test specimens of 38 mm in length and 13 mm in width. A notch with a depth of 0.5 mm was formed in the center of each test sample before storing each sample in a conditioned environment at 23°C and a relative humidity of 55%. The conditioned sample was bent in a U shape with the aid of a clamp. For pure HDPE material and formulated HDPE material, 10 bent samples were put into aluminum sample holders respectively, and then placed in a solution filled with 10v / v% Igepol CO-630 (nonyl...

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Abstract

A polyethylene composition having increased environmental stress crack resistance comprises a polymer blend of a multimodal high density polyethylene (HDPE) and an additive of at least one of a polycarbonate-siloxane copolymer, a polyethylene glycol (PEG) having an average molecular weight (Mw) of at least 2000, and a random block copolymer comprising two different saturated alkane blocks between two aromatic hydrocarbon blocks. The additive is present in the polymer blend in an amount of from 1 wt.% or less by weight of the polymer blend.

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 production of a variety of end-use products, from medical devices to food containers. Conventional propylene-based polymer materials have long been used in processes such as thermoforming, blow molding, coating, etc., where high melt strength is required, which can be achieved by increasing the molecular weight and broadening the molecular weight distribution. In polymerization processes, the molecular weight and molecular weight distribution can be varied by selecting specific process conditions and catalysts. [0003] Polypropylene (PP) has been widely used in the production of bottle caps and closures. But to achieve the necessary cap strength, an inner liner (eg, made of ethylene-vinyl acetate (EVA), polyvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04
CPCC08L23/04C08L2201/08C08L2207/062C08L2666/18C08L69/00C08L83/10C08G77/448C08L23/06
Inventor A·丹巴兰S·瓦达科库朗加拉M·索利曼R·卡拉马兰A·苏达山S·戈帕拉克里希南A·甘谷丽
Owner SABIC GLOBAL TECH BV
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