Textile fibers comprising perfluoroalkanoyl esters of cellulose and process of making the same

Claim 1

A PROCESS OF CONVERTING A CELLULOSE TEXTILE FIBER TO A CELLULOSE TEXTILE FIBER CONTAINING PERFLUOROALKANOYL RADICALS ATTACHED TO THE CELLULOSE MOLECULES, COMPRISING REACTING, AT A TEMPERATURE OF ABOUT FROM 50*C. TO 90*C., A CELLULOSE TEXTILE FIBER WITH AN ESTERIFYING AGENT OF A PERFLUUOROALKANOIC ACID WHEREIN THE ALKANOYL RADICAL CONTAINS FROM 2 TO 10 CARBON ATOMS AND WHICH AGENT IS SELECTED FROM THE GROUP CONSISTING OF THE SAIE ACID, ITS ANHYDRIDE, AND ITS ACYL HALIDE, IN THE PRESENCE OF A QUANTITY OF A NORMALLY LIQUID HETEROCYCLIC TERTIARY AROMATIC AMINE SUFFICIENT TO DISSOLVE THE ESTERIFYING AGENT AND TO NEUTRALIZE ACIDIC REACTION PRODUCTS TO THEIR RESPECTIVE AMINE SALTS, SAID REACTION CARRIED OUT UNTIL PERFLUOROALKANOYL ESTERS OF CELLULOSE IN THE FORM OF A TEXTILE FIBER IS PRODUCED, THE THUS-PRODUCED TEXTILE FIBER HAVING A DEGREE OF SUBSTITUTION RANGING FROM 1 TO 3 PERFLUOROALKANOYL GROUPS PER ANHYDROGLUCOSE UNIT OF THE CELLULOSE AND BEING CHARACTERIZED IN THAT IT IS RESISTANT TO WETTING.