Water-repellent fibrous structures and process for obtaining same

Claim 1

A COMPOSITION OF MATTER WHICH COMPRISES A COLLOIDAL AQUEOUS DISPERSION OF POLYETRAFLUOROETHYLENE CONTAINING FROM 2% TO 40% OF POLYTETRAFLUOROTHYLENE AND FROM 0.1% TO 10% BY WEIGHT OF THE POLYTETRAFLUOROETHYLENE OF A SALT OF THE CLASS CONSISTING OF AMMONIUM AND WATERSOLUBLE BASIC AMINE SALTS OF AN N-MONOALKYL SUBSTITUTED POLYMERIC AMIC ACID OF AN INTERPOLYMER OF A POLYERMIZABLE ORGANIC COMPOUND CONTAINING AN ETHYLENIC DOUBLE BOND AS THE SOLE ALIPHATIC CARBON-TO-CARBON UNSATURATION WITH A BUTENEDIOIC ACID ANHYDRIDE, THE RECURRING TWO NON-OXO CARBONYL GROUPS IN SAID POLYMERIC AMIC ACID BEING ATTAHCED DIRECTLY TO ADJACENT CARBON ATOMS OF THE POLYMERIC CHAIN WHICH CONTAINS STRUCTURAL UNITS IN WHICH THE AMIDE NITROGEN ATOM HAS ATTACHED THERETO HYDROGEN AND A LONG-CHAIN MONOALKYL SUBSTITUENT OF AT LEAST SEVEN CARBON ATOMS, THE BASIC AMINES OF SAID SALTS BEING THOSE HAVING AN INOZATION CONSTANT VALUE GREATER THAN 1X10-6 WHEN MEASURED AT 25*C.