Flame-retardant cable

Abstract

The present invention relates to a flame-retardant cable comprising a transmission element, a flammable element, and a flame-retardant coating layer surrounding said flammable element, and made of a material based on a polymer obtained from a polymerizable liquid composition containing at least a precursor for said polymer including functional groups selected from acrylates, methacrylates, epoxies, vinyl ethers, allyl ethers, and oxetanes, wherein said material includes at least one phosphorous group.

Description

[0001] This application is related to and claims the benefit of priority to French Patent Application No. 02 15065, filed on Nov. 29, 2002, the entirety of which is incorporated herein by reference.[0002] In known manner, the acquirers of electrical and / or optical cables for transporting power and / or transmitting information, seek, in the event of a fire, to avoid flame propagating along a cable, even if laid vertically, and to prevent the insulating material that covers the cable core from dripping away when melted at high temperature.[0003] European patent application EP 1 191 547 A1 describes a cable whose insulating layer of polyethylene is coated in an outer layer that is thin, preferably 5 micrometers (.mu.m) to 50 .mu.m thick, and serving to combat fire propagation, for example. The coating is of polyacrylate polymer formed by ultraviolet radiation.[0004] Not all polyacrylate coatings are capable both of retarding degradation of the cable and also of providing a cable which c...

AI Technical Summary

Benefits of technology

[0006] The object of the invention is to devise a flame-retardant cable, which is preferably inexpensive, and which is quick and easy to manufacture.

[0016] The flammable element may include its own flame-retarding mineral fills, but that do not provide it with sufficient protection against fire. In this configuration, the flame-retarding coating reinforces the ability of said element to withstand fire.

[0021] In this way, the coating is not only highly flame-retardant, but also withstands abrasion and presents good thermomechanical properties. In addition, the antiabrasion compound is easily miscible and makes the composition easier to apply.

[0027] Thus, the coating layer presents good mechanical properties, in particular good elasticity (high breaking elongation), and also improved hardness.

Problems solved by technology

Not all polyacrylate coatings are capable both of retarding degradation of the cable and also of providing a cable which can conserve a degree of operability even when subjected directly to extreme thermal stress such as flame or fire.

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