Patent ID: 7713451

Claim:
A process for manufacturing a water-resistant telecommunication cable comprising a solid and compact element housing at least one transmitting element, wherein the solid and compact element comprises a water-soluble polymer material comprising: a vinyl alcohol/vinyl acetate copolymer having a hydrolysis degree of 60-95% and a polymerisation degree higher than 1,800; at least a first solid plasticizer, having a melting point of 50-100° C., and a second solid plasticizer having a melting point equal to or higher than 140° C., in an amount of 10-30 and 1-10 parts by weight per hundred parts by weight of the copolymer, respectively; the water-soluble polymer material having: a complex modulus equal to or higher than 2.5×10 6 MPa; a ratio of the viscous modulus to the elastic modulus equal to or lower than 2.30; a glass transition temperature of 20-35° C.; the process comprising: continuously producing the water-soluble polymer material by separately feeding in sequence to a multi-screw extruder, in the flow direction, with the copolymer and the second solid plasticizer; melting and mixing the copolymer and the second solid plasticizer at 170-220° C.; melting and mixing the first solid plasticizer with the second solid plasticizer and the copolymer at 140-180° C.; subsequently homogenizing the copolymer and the plasticizers at 100-150° C.; and discharging the melt, at a temperature lower than or equal to 205° C.