Showing papers on "Plastomer published in 1977"

Sealant strip for insulated electric cable - contains elastomer and/or plastomer and water swellable material e.g. cellulose ether

Abstract: Longitudinal sealing compsn. for insulated electric cables contains an elastomer and/or a plastomer, a material which swells by transudation in the presence of water and other conventional additives used in cable prodn. The polymer is pref. chosen from opt. chlorosulphonated polyethylene, EP copolymer, EPDM terpolymer, ethylene-vinyl acetate copolymer, PVC, natural or synthetic rubber. The swelling material comprises a cellulose ether, namely CMC, hydroxyethyl-, hydroxyethylcarboxy-methyl-, (m)ethyl-ethylhydroxyethyl-, or hydroxypropyl-cellulose and is used in amts. of 5-200 wt. % based on polymer. The compsn. also contains not >2000 pts of an insulating mineral filler and 5-100 pts. of a conductive filler which imparts an electrical resistivity 5000ohms. cm, the pts. being based on 100 pts. polymer. The compsn. is resistant to penetration and longitudinal peneration of moisture and satisfies the requirements of 'Electricity de France' HN 33-5-32 standard.