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Cable layer of modified soft polypropylene with improved stress whitening resistance

A cable layer, polypropylene technology, used in circuits, electrical components, rubber insulators, etc.

Active Publication Date: 2013-11-27
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of polypropylene exhibits a property known as stress whitening

Method used

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  • Cable layer of modified soft polypropylene with improved stress whitening resistance
  • Cable layer of modified soft polypropylene with improved stress whitening resistance
  • Cable layer of modified soft polypropylene with improved stress whitening resistance

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0115] A cable layer comprising a propylene polymer composition comprising:

[0116] (a) a heterophasic propylene copolymer (H) comprising:

[0117] (i) polypropylene (A) as matrix,

[0118] (ii) an elastomeric copolymer (E) as an amorphous part dispersed in said matrix,

[0119] (iii) optional crystalline polyethylene,

[0120] as well as

[0121] (b) polar vinyl polymer (C),

[0122] in,

[0123] (i) The heterophasic propylene copolymer (H) rather than the polar ethylene polymer (C) is selected due to the use of difunctionally unsaturated monomers (D') and / or polyfunctionally unsaturated low molecular weight polymers (D") chemical modification, and

[0124] (ii) the cable layer and / or propylene polymer composition has:

[0125] (α) a gel content equal to or greater than 0.20 wt%, and / or

[0126] (β) A strain hardening SH of at least 0.5 3.0 / 2.5 (in 3s -1 at the Hencky strain rate), and / or

[0127] (γ) a branching index g' below 1.0, and

[0128] Wherein, further,...

no. 2 Embodiment approach

[0130] A cable layer comprising a propylene polymer composition comprising:

[0131] (a) a heterophasic propylene copolymer (H) comprising:

[0132] (i) polypropylene (A) as matrix,

[0133] (ii) an elastomeric copolymer (E) as an amorphous part dispersed in said matrix,

[0134] (iii) optional crystalline polyethylene,

[0135] as well as

[0136] (b) polar vinyl polymer (C),

[0137] in,

[0138] (i) The heterophasic propylene copolymer (H) and the polar ethylene polymer (C) are chemically synthesized by using difunctional unsaturated monomers (D') and / or polyfunctional unsaturated low molecular weight polymers (D") modified, and

[0139] (ii) the cable layer and / or propylene polymer composition has:

[0140] (α) a gel content equal to or greater than 0.20 wt%, and / or

[0141] (β) A strain hardening SH of at least 0.5 3.0 / 2.5 (in 3s -1 at the Hencky strain rate), and / or

[0142] (γ) a branching index g' below 1.0, and

[0143] Wherein, further, the cable layer an...

Embodiment

[0288] 1. Definition / measurement method

[0289] Unless otherwise stated, the following definitions of terms and assay methods apply to the above general description of the invention as well as to the following examples.

[0290] pass 13 C NMR spectroscopy quantifies polypropylene isotacticity:

[0291] After a basic setting as in, for example, the following literature, by quantifying 13 C Determination of Isotacticity by Nuclear Magnetic Resonance (NMR): V. Busico and R. Cipullo, Progress in Polymer Science, 2001, 26, 443-533. Adjust the experimental parameters to ensure the determination of quantitative spectra for this specific task, as described, for example, in S. Berger and S. Braun, "200 and More NMR Experiments: A Practical Course", 2004, Wiley-VCH, Weinheim. Quantities are calculated using simple corrected scaling of signal integrals at representative locations in a manner known in the art. Isotacticity is determined by the pentad level, ie the mmmm fraction of t...

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Abstract

Cable layer comprising a propylene polymer composition comprising (a) a polypropylene (A) (b) an elastomeric copolymer (E) comprising units derived from propylene and ethylene and / or C4 to C20 alpha-olefin and (c) a polar ethylene polymer (C) wherein the cable layer and / or the propylene polymer composition has a gel content of equal or more than 0.20 wt.-%.

Description

technical field [0001] The present invention relates to a novel cable layer of polypropylene and its use; and to cables comprising said novel cable layer. Background technique [0002] Today, polyethylene is used as the material of choice for insulating and semiconducting layers in power cables due to ease of processing and favorable electrical properties. In order to ensure good running properties at the required operating temperature (90° C.), the polymer is crosslinked. A disadvantage of this cross-linked polyethylene material is the residual polyethylene crystalline fraction which melts at about 110°C. This means that at emergency temperatures (approximately 135° C.), some problems may occur with the material. Another disadvantage is the lack of renewability of this crosslinked insulation. [0003] Recently, attempts have been made to start replacing the known polyethylene-based cable layers with polypropylene-based cable layers. It is recommended to make various typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/10H01B3/00C08L23/16C08L23/08
CPCH01B3/441H01B3/28C08L23/16C08L23/0846C08L23/08C08L23/10B29B7/007B29B7/38B29B7/726B29B7/728B29B7/845B29B9/06C08L2666/02
Inventor T·彭D·马赫尔S·西蒙K·克利姆克C·斯文伯格T·施特夫尔D·弗里尔
Owner BOREALIS AG
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