Process for imparting water repellency to cellulosic material comprising cellulosic fibers by reaction with an aerosol containing organo silicon halide

Claim 1

IN THE METHOD OF REACTING ORGANO SILICON HALIDES HAVING AS ORGANO SUBSTITUENTS ALKYL GROUPS WITH BETWEEN ONE AND THREE CARBON ATOMS, WITH CELLULOSIC MATERIAL COMPRISING CELLULOSIC FIBERS REACTIVE WITH SAID ORGANO SILICON HALIDES TO FORM A WATER REPELLENT SURFACE COATING BY CONTACTING SAID MATERIAL WITH SAID ORGANO SILICON HALIDE IN VAPOR FORM, THE IMPROVEMENT OF ADVANCING SAID MATERIAL CONTINUOUSLY INTO CONTACT WITH AN ATMOSPHERIC COMPRISING AN AEROSOL MIXTURE OF LIQUID PARTICLES OF SAID ORGANO SILICON HALIDE DISPERSED IN AN INER GAS AND MAINTAINING A CONSTANTLY SUBSTANTIALLY SATURATED VAPOR PHASE OF SAID ORGANO SILICON HALIDE VAPOR ADJACENT TO THE SURFACE OF SAID MATERIAL BY SUPPLYING AND MAINTAINING DISPERSED LIQUID PARTICLES OF SAID ORGANO SILICON HALIDE IN SAID ATMOSPHERE, MAINTAINING SAID MATERIAL IN CONTACT WITH SAID ATMOSPHERE UNTIL THE ORGANO SILICON HALIDE VAPOR REACTS THEREWITH AND RENDERS IT WATER REPELLENT, AND CONTINUOSLY REMOVING SAID MATERIAL FROM SAID ATMOSPHERE.