Coated paper and method of making same

Claim 1

THE METHOD OF PRODUCING COATED PAPER OF THE TYPE HAVING A BASE AND A PRINTING SURFACE CONSISTING OF A CONTINUOUS FILM OF FILLER INTERSPERSED IN BINDER BY MEANS OF WHICH THE FILLER IS RETAINED ON THE BASE COMPRISING COMPLETELY COVERING THE FACE OF A PAPER WITH A CONTINUOUS VISCOUS COATING CONSISTING ESSENTIALLY OF 100 PARTS BY WEIGHT OF FILLER DISPERSED IN A SOLUTION OF FROM 6 TO 10 PARTS BY WEIGHT OF BINDER CONSISTING ESSENTIALLY OF HYDROXY ALKYL CELLULOSE SOLUBLE IN AQUEOUS SODIUM HYDROXIDE BUT INSOLUBLE IN WATER DISSOLVED IN AQUEOUS SODIUM HYDROXIDE AND IMMEDIATELY AFTER APPLICATION OF SAID VISCOUS COATING ELIMINATING THE SODIUM HYDROXIDE FROM THE SOLUTION AND CONVERTING ITS HYDROXYL ION TO WATER BY ION INTERCHANGE AND THEREBY PRECIPITATING SAID HYDROXY ALKYL CELLULOSE FROM SOLUTION TO BIND SAID FILLER TO SAID BASE AND TO FORM ON SAID BASE A CONTINUOUS FILM OF SAID FILLER INTERSPERSED IN SAID HYDROXY ALKYL CELLULOSE BY IMMEDIATELY CONTACTING SAID COATING WITH A WATER SOLUTION OF A WATERSOLUBLE 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, WHEREBY SAID HYDROXY ALKYL CELLULOSE IS PRECIPITATED BEFORE SUBSTANTIAL DRYING OF SAID VISCOUS COATING AND PRIOR TO SUBSTANTIAL PENETRATION OF THE BASE BY SAID VISCOUS COATING AND THEN DRYING THE PAPER.