C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3015, 400/49
C08L 23/08 (2006.01) C08K 3/22 (2006.01) C08L 33/04 (2006.01) C08L 33/08 (2006.01) C08L 23/06 (2006.01) C08L 23/12 (2006.01) C08L 67/02 (2006.01)
Patent
CA 1294383
1 TITLE HALOGEN-FREE FLAME RESISTANT THERMOPLASTIC COMPOSITION BACKGROUND OF THE INVENTION This invention is directed to halogen-free, flame retardant, low smoke generating, dimensionally stable, thermoplastic compositions that are especially useful for wire and cable coverings. Polyvinyl chloride containing compositions and other halogenated polymer compositions when mixed with antioxidants, carbon black and other additives result in excellent wire and cable jacketing. Due to the presence of halogen in the polymers they possess some flame retardant capability However, for some time manufacturers of wire and cable have been concerned both with the flammability of the polymeric coverings and with the emission of toxic and corrosive gases when the polymeric coverings burn. There is a growing awareness of the secondary effects of a fire and in many cases the cost of the secondary damage far exceeds the damage done to the cable. This secondary damage is often caused by the corrosive effects of the gaseous products of the fire. For example, when polyvinyl chloride is used as the base polymer for cable jacketing, toxic and corrosive gases are emitted containing hydrochloric acid and the damaging effects of such gases to the installation can be greater than the fire damage itself. A number of halogen-free polymer mixtures containing flame retardants have been suggested for wire and cable covering. Usually when elastomers are used in the formulation, the elastomer must be cured to obtain satisfactory physical Properties, such as adequate tensile strength and elongation. However, such compositions are thermoset and the scrap material
515980
E.i. Du Pont de Nemours And Company
Sim & Mcburney
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