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Improved strippable cable shield compositions

A composition, resin composition technology, applied in the direction of flexible cables, insulated cables, cables, etc.

Inactive Publication Date: 2006-08-02
GENERAL CABLE TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with these strippable shielding formulations of EVA and nitrile rubber is that the formulation requires a higher content of vinyl acetate in the EVA to achieve the desired level of adhesion, making the formulation more rubbery, which is especially true for industrial cables. high speed desired

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The compositions described in the examples were prepared as follows and molded into 2 mm thick, 150 mm square plates with one side 2 mm thick and 150 mm square and one side bonded to an XLPE block of the same size, followed by heating at 180° C. Both compositions were cured together for 20 minutes in a plate curing press. The level of adhesion was determined each time by the peel strength test detailed below. Each component is also described subsequently.

[0044] Batches of approximately 1350 g (3.31b) of the composition were prepared using a Farrell type BR Banbury internal mixer with a capacity of 1.57 liters. The ingredients used were added to a Banbury mixer, followed by lowering of the ram. Then set medium speed and mix for 2 minutes. The mixture was released, rolled into a flat sheet and quickly molded.

[0045] Test the sample panels as follows, cut the experimental shielding composition layer in parallel lines to the depth of the thickness of the shielding ...

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PUM

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Abstract

The present invention provides a semiconductive resin composition for use as a semiconductive layer in contact with a crosslinked wire and cable insulation layer is disclosed for use where the insulation layer is crosslinked using a peroxide cure system. The resin has a two component base polymer where the first component has a weight average molecular weight of not more than 200,000. The second component is either a polymer having a melting point between 110 DEG C. and 130 DEG C. or a nitrile rubber. The composition also has an adhesion modifying compound different from the base polymer and carbon black. Methods of making the composition and cables using the composition are also disclosed.

Description

field of invention [0001] The present invention relates to semiconductive shielding compositions for electrical cables comprising a two-component base polymer system and an adhesion regulating additive. The invention also relates to such semiconducting shielding compositions, the use of these semiconducting shielding compositions for the manufacture of semiconducting shields for use in electric cables, cables produced from these compositions and methods for producing cables from these semiconducting shielding compositions. The semiconductive shielding compositions of the present invention are useful as strippable "semiconductor" dielectric shields (also known as core shields, dielectric shields and core shield materials) in power cables with cross-linked polymer insulation , said cables are mainly medium voltage cables for voltages from about 5 kV up to about 100 kV. Background of the invention [0002] A typical power cable usually has one or more conductors within a core ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B7/04H01B7/17H01BH01B1/00H01B3/44H01B7/00
CPCH01B3/441H01B3/446H01B3/447
Inventor M·R·伊斯特
Owner GENERAL CABLE TECH CORP