Method of forming an inorganic waterlaid sheet containing colloidal silica and cationic starch

• US 3,253,978 A
• Filed: 08/31/1964
• Issued: 05/31/1966
• Est. Priority Date: 07/19/1961
• Status: Expired due to Term

• Current Assignee: Fay H. Osborne, Warren J. Bodendorf
• Original Assignee: Fay H. Osborne, Warren J. Bodendorf
• Inventors: Bodendorf, Warren J., Osborne, Fay H.
• Application Number:
  US04/394,650
• Time in Patent Office: 638 Days
• US Class Current: 162/152
• CPC Class Codes: B44C 1/1712 Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
• CPC Class Codes: D21H 13/38 siliceous
• CPC Class Codes: D21H 17/29 cationic
• CPC Class Codes: D21H 17/68 siliceous, e.g. clays
• CPC Class Codes: D21H 23/00 Processes or apparatus for adding material to the pulp or to the paper applying liquids or other fluent material to surfaces, in general B05; processes for making continuous lengths of paper D21F11/00
• CPC Class Codes: Y10T 428/31634 Next to cellulosic

Claims

1. THE METHOD OF FORMING AN INORGANIC SHEET COMPRISING FORMING A SUBSTANTIALLY HOMOGENEOUS AQUEOUS SLURRY OF INORGANIC PARTICLES AND COLLOIDAL SILICA;

FEEDING SAID SLURRY TO THE HEADBOX OF A PAPERMAKING MACHINE WHILE SIMULTANEOUSLY FEEDING THEREWITH A SOLUTION OF A CATIONIC STARCH TO FORM A MIXTURE WITH SAID SLURRY, SAID CATIONIC STARCH SOLUTION ADMIXING WITH SAID SLURRY SHORTLY BEFORE DEPOSITION OF THE INORGANIC PARTICLES UPON THE WIRE OF THE PAPERMAKING MACHINE AND BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE ABOUT 0.5-10.0 PERCENT BY WEIGHT OF THE SOLIDS IN SAID SLURRY;

AND CAUSING SAID MIXTURE TO DEPOSIT UPON THE SCREEN OF A PAPERMAKING MACHINE TO FORM A WEB HAVING THE INORGANIC PARTICLES FIRMLY BONDED TO GETHER WITH COLLOIDAL SILICA UNIFORMLY DISTRIBUTED ACROSS THE SURFACES OF THE INORGANIC PARTICLES.