Salt peptized proteinaceous adhesive and coating composition employing the same as abinder

Claim 1

A PROCESS FOR PREPARING A COATING COMPOSITION THAT YIELDS A MALEABLE COATING ON A PAPER WEB COMPRISING: PREPARING A PEPTIZED AQUEOUS SOLUTION OF A PROTEIN BY FROM THE GROUP CONSISTING OF CASEIN AND SOY PROTEIN BY ADMIXING AT A TEMPERATURE IN THE RANGE OF 140* TO 212* F. SAID PROTEIN WITH A SOLUBLE SALT OF A MONOVALENT ANION AND A CATION SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL IONS AND THE AMMONIUM ION WHILE MAINTAINING THE PH OF THE ADMIXTURE BETWEEN THE ISO-ELECTRO POINT OF SAID PROTEIN AND 7, SAID SOLUBLE SALT IN A 5 PERCENT AQUEOUS SOLUTION HAVING A PH IN THE RANGE OF 4.5 TO 7.0, SAID PROTEIN BEING IN THE RANGE OF 20 TO TO 35 PERCENT OF SAID SOLUTION AND SAID SALT BEING IN THE RANGE OF 4 TO 10 PERCENT THEREOF, THEREAFTER FORMING A STIFF SLURRY BY ADMIXING SAID AQUEOUS SOLUTION WITH A COOL SLURRY OF A PAPER-COATING-GRADE MINERAL PIGMENT, THE AMOUNT OF SAID SLURRY BEING SUFFICIENT TO DILUTE THE CONCENTRATION OF SAID SALT IN THE RESULTING MIXTURE TO BELOW ABOUT 4 PERCENT WHERE IT NO LONGER PEPTIZES SAID PROTEIN, AND AGITATING SAID STIFF SLURRY TO A HOMOGENOUS MIXTURE OF SUBSTANTIALLY LOWER VISCOSITY.