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Insulating composition for communication cables

A technology for communication cables and compositions, applied in the field of insulating compositions, which can solve problems such as unfavorable insulating layers and expensive stabilizers

Inactive Publication Date: 2001-07-25
ボレアリステクノロジーオイ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve good heat resistance, various stabilizers are usually added to the insulating composition, such as thermal oxidation stabilizers and metal passivators, but such stabilizers are expensive, so if the use of stabilizers can be reduced or omitted is ideal
In addition, fillers (such as petroleum jelly) and copper conductors often have an adverse effect on the insulation, especially when remote signal transmission lines are exposed to high temperatures

Method used

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  • Insulating composition for communication cables
  • Insulating composition for communication cables

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In a polymerization plant consisting of two gas-phase reactors connected in series, two different bimodal ethylene plastics (referred to below as polymer A and polymer B respectively) were polymerized using Ziegler-Natta catalysts. Polymerization is carried out in the first reactor (R 1 ) produces a high molecular weight polymer fraction, while in the second reactor (R 2 ) to produce a low molecular weight polymer fraction. Conventional monomodal vinyl (Ref.) was used as insulation for reference remote signal transmission lines.

[0046] The properties of polymers A, B and Ref. such as melt flow rate, density, thermo-oxidative stability and ESCR were determined and the results are listed in Table 1.

[0047] Table 1

[0048] Polymer A Polymer B Ref.MFR 2 , final polymer 0.54 0.95 0.72(g / 10m min) density, final polymer 0.946 0.945 0.946(g / cm 3 )FRR 21 / 2 , final polymer 62 68 86MFR 21 ,R1*(g / 10min) 5 5 - Density, R1*...

Embodiment 2

[0053] The processability of the polymers in Example 1 (Polymers A, B and Ref.) was determined as previously described by measuring extruder speed (rpm), extruder pressure change, and the diameter of the remote signal transmission line produced. change to determine. The remote signal transmission line has 0.5mm solid copper conductors in it, and its outer diameter is 0.98mm. The extruder was run at a line speed of 510 m / min and at a temperature of 240°C. The results are listed in Table 2.

[0054] Table 2

[0055] Polymer A Polymer B Ref. Extruder Speed ​​19.5 19.1 23.7 (Output 1kg / min) Pressure Change, % ±0.2 ±0.2 ±0.9 Diameter Change, % ±0.0 ±0.0 ±2

[0056] As can be seen from the results in Table 2, when the remote signal transmission line insulating layer of the present invention is compared with the single-mode reference composition, its processability is improved by about 20% relative to the extruder speed, the pressure change rate is l...

Embodiment 3

[0058] The mechanical properties of polymer B in Example 1 and the reference polymer (Ref.) in Example 1 were determined according to the method ISO 527-2, 1993 / 5A on dumbbell-shaped specimens. The dumbbell samples were compression molded from the polymer pellets described above. According to the IEC811-1-2 method, the dumbbell-shaped samples were placed in a furnace at 115°C to undergo aging for different periods of time. The measurement results are listed in Table 3.

[0059] table 3

[0060] Tensile strength at break (MPa)

[0061] Unaged Aged

[0062] Two months Four months Six months Polymer B 33.4 27.9 30.7 33Ref. 14 16.4 17.4 16.2

[0063] Elongation at break (%)

[0064] Unaged Aged

[0065] Two months Four months Six months Polymer B 1100 841 951 854Ref. 456 729 710 483

[0066] OIT(min)

[0067] Unaged Aged

[0068] ...

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Abstract

An insulating composition for communication cables (2) is disclosed as well as a telesingle wire (2) which comprises the insulating composition and a telecommunication cable (1) which comprises a plurality of telesingle wires (2) including the insulating composition. The insulating composition comprises a multimodal olefin polymer mixture, obtained by polymerisation of at least one alpha -olefin in more than one stage having a density of about 0.920-0.965 g / cm<3>, a melt flow rate (MFR2) of about 0.2-5 g / 10 min, an FRR21 / 2 >= 60, and an environmental stress cracking resistance (ESCR) according to ASTM D 1693 A / 10 % Igepal, of at least 500 hrs, said olefin polymer mixture comprising at least a first and a second olefin polymer, of which the first is selected from (a) a low molecular weight (MW) olefin polymer with a density of about 0.925-0.975 g / cm<3> and a melt flow rate (MFR2) of about 300-20 000 g / 10 min, and (b) a high molecular weight (MW) olefin polymer with a density of about 0.880-0.950 g / cm<3> and a melt flow rate (MFR21) of about 0.5-20 g / 10 min.

Description

field of invention [0001] The present invention relates to insulating compositions for use in telecommunication cables having insulatingly clad copper conductors for data transmission, video transmission or audio transmission. More particularly, the present invention relates to insulating compositions for use as data transmission wires of communication cables such as telesingle wires and coaxial cables. Background of the invention [0002] Telecommunication cables usually consist of multiple telecommunication signal transmission wires wrapped in a sheath. The number of remote signal transmission lines can vary depending on the application, from a few transmission lines in a data transmission cable to up to about a thousand transmission lines in a telephone cable. The sheath wrapping the remote signal transmission wiring harness can be composed of at least one layer or two layers, that is, an inner sheath and an outer sheath. To further protect and insulate remote signal tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/44H01B11/18
CPCY10T29/49123H01B3/441H01B3/30
Inventor L·罗戈斯特德H-B·马丁森L·索恩R·达穆尔特
Owner ボレアリステクノロジーオイ