Abstract: Cordage suitable for use, for example, in spring telephone cords which connect a telephone handset to a telephone base and a line cord which connects the telephone base to a wall terminal includes a plurality of tinsel conductors individually insulated with a polyether polyester thermoplastic copolymer obtained by reacting 1, 4 butane diol terephthalate with terephthalate esters of polytetramethylene glycol and stabilized with a long chain hindered phenolic antioxidant, tubed over each of the conductors, and a jacket comprising a plasticized polyvinyl chloride composition. The polyether polyester copolymer provides the cordage unexpectedly with superior mechanical properties such as, for example, resiliency, flex life and creep resistance. Spring cords of the above-described construction exhibit outstanding extensile and retractile properties.

Abstract: An insulation comprising a polyether polyester thermoplastic copolymer obtained by reacting 1, 4 butane diol terephthalate with terepthalate esters of polytetramethylene glycol is coated over an irregularly configured conductor, such as for example, a tinsel conductor, suitable for use in telecommunications cordage by moving the copolymer through an extruder and along a flow path formed between a core tube and wall of a die cavity. The die cavity adjacent to the throat of the die has a frustoconical portion formed with an approach angle of sufficient magnitude to minimize the pressure drop through the extruder to extrude the copolymer at a temperature slightly above the melting point of the copolymer.

Abstract: A line cord of a telephone handset having individually insulated conductors is jacketed with an extrudable flexible clear flame retardant composition which includes a polyvinyl chloride resin (PVC), 10 to 55 parts by weight per 100 parts by weight of the PVC of a phthalate plasticizer, 3 to 50 parts by weight per 100 parts by weight of the PVC of a phosphate plasticizer, 2 to 5 parts by weight per 100 parts by weight of the PVC of a metallic stabilizer, 0.25 to 1.0 part by weight per 100 parts by weight of the PVC of a lubricant, 0.25 to 1.0 part by weight per 100 parts by weight of the PVC of an ultraviolet absorber, 1 to 4 parts by weight per 100 parts by weight of the PVC of an epoxy resin, and 1 to 8 parts by weight per 100 parts by weight of the PVC of an epoxy plasticizer.

Abstract: A retractile cord of a telephone handset having individually insulated conductors is jacketed with an extrudable flexible clear flame retardant composition which includes a polyvinyl chloride resin (PVC). A phthalate plasticizer is included to impart low temperature properties to the composition while a phosphate plasticizer is used for flame retardancy and a polymeric plasticizer for resistance to extraction of constituents of the composition by oils encountered during use. The composition also includes a metallic stabilizer, a lubricant, an ultraviolet light absorber, an epoxy resin and epoxidized plasticizing stabilizer. The extruded composition is characterized by excellent clarity as well as superior low temperature, flame-retardant and lacquer-mar properties. Equally important is the outstanding resiliency of strand material covered with the composition and wound into a helical configuration with a plurality of convolutions.