Process of treatment of textile material with silica

Claim 1

A PROCESS FOR TREATING TEXTILE MATERIALS OF STAPLE FIBERS OR KNIT FABRICS PREPARED FROM FIBER-FORMING FILAMENTS WHICH CONTAIN AMIDO GROUPS WHICH COMPRISES WETTING OUT SAID MATERIALS IN FROM 5 TO 50 TIMES THEIR OWN WEIGHT OF A COMPOSITION CONSISTING OF AN ACIDIC AQUEOUS SOLUTION HAVING A PH BETWEEN ABOUT 3 TO 6.5 AND CONTAINING (1) FROM 0.5 TO 4% BY WEIGHT OF COLLOIDAL SILICA BASED ON THE DRY WEIGHT OF THE MATERIALS AND (2) A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF AMMONIUM AND ALKALI METAL SALTS OF HYDROCHLORIC AND SULFURIC ACIDS, SAID SALTS BEING PRESENT IN AN AMOUNT SUFFICIENT TO AID EXHAUSTION OF THE COLLOIDAL SILICA ONTO SAID TEXTILE MATERIALS, MAINTAINING SAID TEXTILE MATERIALS IN CONTACT WITH SAID COMPOSITION UNTIL SUBSTANTIALLY ALL OF THE COLLOIDAL SILICA MIGRATES FROM THE COMPOSITION TO SAID MATERIALS, WHEREBY SAID COMPOSITION IS RENDERED SUBSTANTIALLY FREE OF COLLOIDAL SILICA, AND THEN DRYING THE TEXTILE MATERIALS.