Process for the preparation of nonwoven water blocking tapes and their use in cable manufacture

摘要

A process for the manufacture of a nonwoven water blocking tape for use in cable manufacture, which process comprises the steps of:(i) forming a coating of an aqueous solution of a water soluble polymer containing anionic groups and a multivalent ionic crosslinking agent on at least one surface of a nonwoven substrate material; and(ii) drying and/or curing the coating in order to form a partially crosslinked water swellable polymer coating on the at least one surface of the nonwoven substrate material.Water blocking tapes are also provided which comprise a nonwoven substrate material having a coating on at least one surface thereof of a water soluble polymer containing anionic groups which is partially crosslinked with a multivalent ionic crosslinking agent.