Flame-retardant composition for polymer compounds
AssigneePirelli Cavi e Sistemi S.p.A.
InventorFlavio Casiraghi
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Abstract
Additive composition for polymer compounds containing magnesium hydroxide, calcium carbonate at least a phosphorus compound and at least a nitrogen compound, capable of conferring flame-retardant properties to the polymer compounds to which it is added, maintaining the mechanical properties of said compound within limits acceptable for the use of the end product.
Claims32
Cable comprising a conductor and a sheath in which the sheath includes at least a layer of polymer compound, based on halogen-free polymers, wherein said sheath contains a predetermined quantity of a flame-retardant composition comprising magnesium hydroxide, calcium carbonate, at least one phosphorus compound and at least one nitrogen compound, such as to give flame retardant characteristics to said sheath.
A method for conferring flame-retardant properties on a cable with a sheath containing a halogen-free polymer compound, wherein to said polymer compound is added a predetermined quantity of a composition containing magnesium hydroxide, calcium carbonate, at least one phosphorus compound and at least one nitrogen compound.
A polymer blend based on halogen-free polymers containing a predetermined quantity of a halogen-free flame-retardant composition comprising magnesium hydroxide, calcium carbonate, at least one phosphorus compound and at least one nitrogen compound.
A method for conferring flame-retardant properties on a polymer based on halogen-free polymers comprising the steps of:
- (a) adding to said polymer a predetermined quantity of a composition comprising magnesium hydroxide, calcium carbonate, at least one phosphorus compound and at least one nitrogen compound;
- (b) mixing said polymer with said composition to form a polymer blend;
- (c) granulating said polymer blend;
- and
- (d) drying said polymer blend.
Cable comprising a conductor and a sheath in which the sheath includes at least a layer of polymer compound, based on halogen-free polymers, wherein said sheath contains a predetermined quantity of a flame-retardant composition comprising magnesium hydroxide, calcium carbonate, at least one phosphorus compound selected from the group consisting of salts of phosphorous or phosphoric acids including phosphites, phosphates and polyphosphates;
- organic esters or polyesters of phosphoric acid including mono-, di-alkyl, tri-alkyl, or -aryl phosphates and polyphosphates;
- phosphonates and polyphosphonates including mono-alkyl, di-alkyl, or -aryl phosphonates or polyphosphonates;
- and at least one nitrogen compound selected from the group consisting of inorganic nitrogen containing salts or organic nitrogen containing compounds and their organic nitrogen containing salts, such as to give flame retardant characteristics to said sheath.
Dependencies are inferred from the claim text.