Plastic article having flame retardant properties
AssigneeMonsanto Company
InventorFran.cedilla.ois De Keyser
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Abstract
New plastic articles are disclosed and claimed having flame retardant properties which contain a core of a plastic polymeric material (thermoplastic, thermoset, rigid foam or semi-flexible foam polymeric material) which is coated with a protective, flame retardant layer comprising a mixture of a thermoplastic polymeric material and a flame retardant, char-forming, intumescent system. The new articles are suitable for the manufacture of e.g. rods, beams, pipes, hoses, non-tubular profiles and panels which are useful in various industries such as the building, automotive and mining industries.
Claims1
A process for the manufacture of a plastic article having flame retardant properties, which process comprises the step of coating a core of plastic polymeric material with a protective, flame retardant layer consisting essentially of a mixture of a thermoplastic polymeric material selected from the group consisting of a polyolefin and mixtures of polyolefins and a flame retardant, char-forming, intumescent system (FRI system) comprising a flame retardant, char-forming, intumescent additive and a catalyst selected from the group consisting of phosphoric acid precursor, a polyphosphoric acid precursor, and mixtures thereof, each in a concentration, expressed by reference to FRI system (100%), effective to provide flame retardancy to the plastic article, wherein the plastic polymeric material of the core is coated with the protective, flame retardant layer by a technique selected from the group consisting of sequential extrusion, co-extrusion, crosshead extrusion, jacketing, and lamination.
Dependencies are inferred from the claim text.