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Process for foaming polyolefin compositions using fluororesin/citrate mixture as nucleating agent

A technology of foamed polyolefin and citrate, applied in the direction of plastic/resin/wax insulator, organic chemistry, organic insulator, etc., which can solve the problems of unfavorable electrical performance of cables

Active Publication Date: 2017-09-08
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the by-products of the decomposed ADCA and OBSH are highly polar and are known to have a significant adverse effect on the electrical performance of the cable (dissipation factor)

Method used

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  • Process for foaming polyolefin compositions using fluororesin/citrate mixture as nucleating agent
  • Process for foaming polyolefin compositions using fluororesin/citrate mixture as nucleating agent
  • Process for foaming polyolefin compositions using fluororesin/citrate mixture as nucleating agent

Examples

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Effect test

example 1 to example 6 and comparative example 1 to comparative example 4

[0075] Material

[0076] LDPE-1 is a low density polyethylene (LDPE) with a MI of 2.3 g / 10 min (ASTM D-1238, (190° C. / 2.16 Kg)) and a density of 0.92 g / cc (ASTM D-792).

[0077] PTFE to ZONYL TM MP 1400, a white free-flowing PTFE, has an average particle size of 10 μm and is commercially available from DuPont.

[0078] SONGNOX TM 1024FG is 2', 3-bis[[3-[3,5-di-tert-butyl-4-hydroxyphenyl]-propionyl]] propionyl hydrazide, a commercially available from Songwon International Americas Inc. -Antioxidant from Americas, Inc.).

[0079] LDPE-2 is DFDB-1258 NT, a low-density polyethylene (LDPE) with a MI of 6 g / 10 min (ASTM D-1238, (190°C / 2.16 kg)) and a density of 0.922 g / cc (ASTM D- 792), available from The Dow Chemical Company.

[0080] HDPE-1 is DGDA-6944 NT, a high-density polyethylene (HDPE) with a MI of 8 g / 10 min (ASTM D-1238, (190°C / 2.16 kg)) and a density of 0.965 g / cc (ASTM D- 792), available from The Dow Chemical Company.

[0081] CM-1 for HYDROCEROL TM CF, a mixt...

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Abstract

The process of foaming a polyolefin, e.g., polyethylene, composition using as a nucleator a combination of (A) a fluororesin, and (B) a mixture of (1) a first component consisting of at least one of citric acid and an alkali metal citrate, and (2) a second component consisting of at least one of an alkali metal citrate, a di-alkali metal hydrogen citrate, an alkali metal dihydrogen citrate and an alkali metal bicarbonate with the proviso that if the first component of the mixture is an alkali metal citrate, then the second component of the mixture is not an alkali metal citrate.

Description

technical field [0001] The present invention relates to a method of foaming a composition. In one aspect, the present invention relates to foamed polyolefin compositions using a fluororesin as a crystal nucleating agent, and in another aspect, the present invention relates to foamed compositions prepared by the method. In yet another aspect, the invention relates to the use of the foamed composition as an insulating layer in electrical communication cables, especially high frequency coaxial cables. Background technique [0002] Typically, insulation layers for high frequency telecommunication cables are produced by mixing nucleating agents with mixtures of high density polyethylene (HDPE) and low density polyethylene (LDPE). The foamable material is then extruded in the presence of a physical blowing agent such as a gas such as nitrogen, carbon dioxide, chlorinated fluorocarbons, freons, helium, neon, argon, krypton, xenon and radon gas, which is injected into the polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/44C08L27/18C08L23/06
CPCC08L23/06H01B3/441H01B3/445C08J9/0061C08J9/08C08J2203/02C08J2323/06C08J2423/06C08J2427/12C08K5/098C08K2003/262C08L27/18H01B3/44C08K5/0083C08L2207/062C08L2207/066C07C55/22C08J9/228
Inventor 孙刚伟M·埃斯吉尔X·M·徐C·J·克梅茨
Owner DOW GLOBAL TECH LLC