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High porosity microcellular polyethylene

A high-density polyethylene and low-density polyethylene technology, applied in the field of polyethylene foam, can solve the problems of collapsed structure and unevenness of foam cells

Active Publication Date: 2018-08-31
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

in N 2 Attempts to achieve higher porosity during foaming often result in foam cell collapse and non-uniform structure

Method used

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  • High porosity microcellular polyethylene
  • High porosity microcellular polyethylene
  • High porosity microcellular polyethylene

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Experimental program
Comparison scheme
Effect test

example

[0051] Test Methods

[0052] gel content

[0053] Approximately 1.5 grams (g) of the cross-linked sample was weighed and then packaged with 180 mesh metal mesh. Record the weight of the sample before and after packaging. The packaged samples were inserted into 250 mL flasks and then immersed in 200 mL of toluene. After boiling at 120 °C for at least 6 hours, the encapsulated samples were removed from the flasks and dried at room temperature for 24 hours. The remaining weight is also recorded. The gel content was calculated by the following equation:

[0054]

[0055] in

[0056] W1 is the weight after metal mesh packaging;

[0057] W2 is the weight before encapsulation with metal mesh; and

[0058] W0 is the weight of the initial sample.

[0059] Pore ​​Size Analysis

[0060] PE foam samples were broken up using liquid nitrogen and subsequently coated with iridium. Scanning electron microscopy (SEM) images ( image 3 ) obtained at different magnifications. The a...

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PUM

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Abstract

A process for making a foam composition, the process comprising the steps of: (A) Forming a mixture comprising high density polyethylene (HDPE), low density polyethylene (LDPE) and a peroxide; and (B)Contacting the mixture of (A) with carbon dioxide (CO2) at a pressure greater than or equal to 15 megaPascals (MPa). In one embodiment the peroxide is DTAP. In one embodiment the mixture of (A) further comprises a CO2-philic compound such as PDMS.

Description

technical field [0001] The present invention relates to polyethylene (PE) foam. In one aspect, the invention relates to PE foams useful as telecommunications insulation, and in another aspect, the invention relates to coaxial and radio frequency cables comprising PE foams. Background technique [0002] Coaxial / RF cables made of high foamed polyethylene are widely used as antenna feeders, antenna array wiring, device interconnection, mobile communication systems, microwave transmission systems, broadcast transmission systems, and other communication systems. As the demand for high bandwidth increases, cables require the use of highly foamed dielectrics made of polymer resins such as polyolefins that have minimal polar groups or polar additives and are cost-effective and Has good electrical properties. [0003] Typically, high frequency cables are made with an inner conductor surrounded by foam insulation. The base resin used for insulation is usually a mixture of high-dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08J9/00
CPCC08J9/0023C08J9/0061C08L23/06C08J2201/026C08J2201/03C08J2201/032C08J2203/06C08J2203/08C08J2205/044C08J2207/06C08J2323/06C08J2423/06C08J2483/04C08K5/14C08L23/04C08L2203/14C08L2207/062C08L2310/00C08L2312/00H01B3/441C08J9/122C08L23/0815C08L2205/025
Inventor 陈成孙刚伟M·埃斯吉尔J·M·柯吉恩杜哲张建鑫
Owner DOW GLOBAL TECH LLC