WATER-RESISTANT TELECOMMUNICATION CABLE

摘要

Telecommunication cable comprising an elongated element housing at least one transmitting element,said elongated element comprising a water−soluble polymeric composition which comprises:−a vinyl alcohol/vinyl acetate(VA−VAc)copolymer having a saponification degree of from about 60% to about 95%;−a plasticizer;a hydrolysis stabilizer compound comprising a chelant group comprising two hydrogen atoms bonded to two respective heteroatoms selected from nitrogen,oxygen and sulfur,said two hydrogen atoms having a distance between each other of from 4.2 x 10−10 m to 5.8 x 10−10 m,preferably of from 4.5 x 10−10 m to 5.5 x 10−10 m,said stabilizer compound being present in an amount of at least 0.75 mmoles per 100 g of VA−VAc copolymer.Said elongated element is in particular a buffer tube hosing a plurality of optical fibers.The presence of the stabilizer allows to reduce the increase of the hydrolysis degree of the VA−VAc copolymer upon aging,thus maintaining the desired water blocking properties of the VA−VAc copolymer.