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    • 8. 发明授权
    • WATER-RESISTANT CABLE
    • 防水电缆
    • EP1121693B1
    • 2010-12-08
    • EP99952532.2
    • 1999-10-06
    • Prysmian S.p.A.
    • ANELLI, PietroCOLOMBO, Gianfranco
    • H01B7/28G02B6/44
    • G02B6/4433G02B6/441G02B6/4494H01B7/28H01B7/288
    • The present invention relates to a cable, in particular an optical fibre cable, which is resistant to the radial permeation and to the longitudinal propagation of water. This cable comprises a water-soluble polymer material, characterized in that the said material is a water-swellable and water-soluble material. In particular, this cable is characterized in that, following the ingress of water into this cable, the propagation of water is impeded on account of the combined effect of the swelling of the water-soluble material and the formation of an aqueous solution of the said material which has a predetermined viscosity, so as to impede the passage of the residual water. Preferably, the water-soluble material is chosen from polyacrylamide, modified polyvinyl alcohol, vinyl alcohol/vinyl acetate copolymers, polyvinylpyrrolidone, and mixtures thereof, the material preferably being a vinyl alcohol/vinyl acetate copolymer. The material can advantageously be extruded to form tubular elements for containing optical fibres, for example two-layer tubular elements in which the inner layer is made of water-soluble material and the outer layer is made of a conventional polymer such as PE, PP or PBT.