Method of coating paper

Claim 1

THE METHOD OF PRODUCING PAPER IMPERVIOUS TO OIL, GREASE, ORGANIC SOLVENTS, AROMATIC ODORS AND GASES COMPRISING COMPLETELY COVERING THE FACE OF A PAPER BASE WITH A-CONTINUOUS VISCOUS COATING CONSISTING ESSENTIALLY OF A HYDROXY ETHYL CELLULOSE INSOLUBLE IN WATER BUT SOLUBLE IN AQUEOUS SODIUM HYDROXIDE DISSOLVED IN A WATER SOLUTION OF SODIUM HYDROXIDE AND IMMEDIATELY FORMING A CONTINUOUS FILM OF SAID HYDROXY ETHYL CELLULOSE ON AND FIXED TO THE SURFACE OF AND COMPLETELY COVERING SAID PAPER BASE BY IMMEDIATELY ELIMINATING THE SODIUM HYDROXIDE FROM THE SOLUTION AND CONVERTING ITS HYDROXYL ION TO WATER BY ION INTERCHANGE AND THEREBY PRECIPITATING SAID HYDROXY ETHYL CELLULOSE FROM SOLUTION BY IMMEDIATELY CONTACTING SAID COATING WITH A WATER SOLUTION OF A WATER-SOLUBLE COMPOUND HAVING AN ION REACTIVE WITH THE SODIUM ION OF SAID SODIUM HYDROXIDE TO FORM A WATER-SOLUBLE SODIUM SALT AND AN ION REACTIVE WITH THE HYDROXYL ION OF SAID SODIUM HYDROXIDE, SAID COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE ACIDS, ALKALI METAL ACID SALTS, AND AMMONIUM SALTS.