Viscosity stabilization of latex emulsion paints containing proteins by inclusion therein of aldehydes

Claim 1

A METHOD OF STABILIZING THE VISCOSITY OF EMULSION PAINTS WHOSE ESSENTIAL COMPONENTS ARE A PIGMENT, A PAINT LATEX CONSISTING ESSENTIALLY OF AN OIL-IN-WATER EMULSION COPOLYMER OF A MAJOR PROPORTION OF A MONOVINYL AROMATIC HYDROCARBON CONTAINING BUT A SINGLE REACTIVE CENTER OF POLYMERIZATION AND A MINOR PROPORTION OF A CONJUGATED DIOLEFINE, SAID PAINT LATEX CONSTITUTING THE PRINCIPAL NONVOLATILE BINDER VEHICLE FOR THE PIGMENT COMPONENT, AND AN AQUEOUS DISPERSION OF A VEGETABLE PROTEIN HAVING A PH ABOVE 7 AS A MAJOR PROPORTION OF THE PROTECTIVE COLLOID AND WHICH CONSTITUTES BUT A MINOR PROPORTION OF THE NON-VOLATILE VEHICLE BINDER OF SAID PAINT SYSTEM SAID METHOD COMPRISING INCORPORATING INTO SAID COMPONENTS DURING EMULSION PAINT MANUFACTURE A QUANTITY OF FROM ABOUT 1% TO ABOUT 12% BASED ON THE WEIGHT OF THE DRY VEGETABLE PROTEIN PRESENT IN THE EMULSION PAINT OF A WATERSOLUBLE ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 5 CARBON ATOMS BY ADDING SAID QUANTITY OF SAID ALDEHYDE IN THE TIME ORDER OF THE EMULSION PAINT MANUFACTURE SUCH THAT THE AQUEOUS PROTEIN SOLUTION HAS BEEN ADDED AND INCORPORATED PRIOR TO THE ALDEHYDE ADDITION AND SAID QUANTITY OF SAID ALDEHYDE IS ADDED NOT EARLIER THAN CONCURRENTLY WITH THE FIRST INCREMENT OF ADDITION OF SAID PAINT LATEX TO SAID PROTEIN BUT SAID QUANTITY OF SAID ALDEHYDE IS ADDED NOT LATER THAN BEFORE INCORPORATION OF THE OTHER ALDEHYDE BINDING COMPONENTS TO THE PAINT SYSTEM.

Claim 2

A METHOD OF STABILIZING THE VISCOSITY OF EMULSION PAINTS WHOSE ESSENTIAL COMPONENTS ARE A PIGMENT, A PAINT LATEX CONSISTING ESSENTIALLY OF AN OIL-IN-WATER EMULSION COPOLYMER OF A MAJOR PROPORTION OF A MONOVINYL AROMATIC HYDROCARBON CONTAINING BUT A SINGLE REACTIVE CENTER OF POLYMERIZATION AND A MINOR PROPORTION OF A CONJUGATED DIOLEFINE, SAID PAINT LATEX CONSTITUTING THE PRINCIPAL NONVOLATILE BINDER VEHICLE FOR THE PIGMENT COMPONENT, AND AN AQUEOUS DISPERSION OF A VEGETABLE PROTEIN HAVING A PH ABOVE 7 AS A MAJOR PROPORTION OF THE PROTECTIVE COLLOID AND WHICH CONSTITUTES BUT A MINOR PROPORTION OF THE NON-VOLATILE VEHICLE BINDER OF SAID PAINT SYSTEM SAID METHOD COMPRISING INCORPORATING INTO SAID COMPONENTS DURING EMULSION PAINT MANUFACTURE A QUANTITY OF FROM ABOUT 1% TO ABOUT 12% BASED ON THE WEIGHT OF THE DRY VEGETABLE PROTEIN PRESENT IN THE EMULSION PAINT OF A WATERSOLUBLE ALIPHATIC ALDEHYDE CONTAINING NOT MORE THAN 5 CARBON ATOMS BY ADDING SAID QUANTITY OF SAID ALDEHYDE IN THE TIME ORDER OF THE EMULSION PAINT MANUFACTURE SUCH THAT THE AQUEOUS PROTEIN SOLUTION HAS BEEN ADDED AND INCORPORATED PRIOR TO THE ALDEHYDE ADDITION AND SAID QUANTITY OF SAID ALDEHYDE IS ADDED NOT EARLIER THAN CONCURRENTLY WITH THE FIRST INCREMENT OF ADDITION OF SAID PAINT LATEX TO SAID PROTEIN BUT SAID QUANTITY OF SAID ALDEHYDE IS ADDED NOT LATER THAN BEFORE INCORPORATION OF THE OTHER ALDEHYDE BINDING COMPONENTS TO THE PAINT SYSTEM.