CORDAGE FOR USE IN TELECOMMUNICATIONS

摘要

Congdon et al 1-1-5 CORDAGE FOR USE IN TELECOMMUNICATIONS 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. -i-