Emulsion vapor barrier coating compositions

Claim 1

AN EMULSION COATING COMPOSITION CHARACTERIZED BY GOOD HOLD-OUT PROPERTIES AND THE ABILITY TO FORM A SUBSTANTIALLY CONTINUOUS FILM WHEN APPLIED IN A SINGLE COAT ON POROUS SURFACES, SAID COMPOSITION WHEN APPLIED BEING AN EMULSION OF THE OIL-IN-WATER TYPE AND CONTAINING BETWEEN 40% AND 60% OF WATER BY WEIGHT, THE REMAINDER CONSISTING ESSENTIALLY OF: (A) FINELY-DIVIDED INERT SOLIDS HAVING A PARTICLE SIZE BELOW ABOUT 44 MICROONS, COMPRISING AT LEAST ONE ELASTOMERIC AND POLYMERIC SYNTHETIC WATER-INSOLUBLE FILM-FORMING MATERIAL HAVING A PARTICLE SIZE BELOW ABUT 0.5 MICRON AND SELECTED FROM THE GROUP CONSISTING OF: ELASTOMERIC HOMOPLYMERS OF VINYL COMPOUNDS, ELASTOMERIC HOMOPOLYMERS OF ISOBUTYLENE, AND COPOLYMERS OF A MIXTURE OF MONOMERS CONTAINING AT LEAST ONE VINYL COMPOUND, SAID ELASTOMERIC FILM-FORMING MATERIAL HAVING A VOLUME RATIO TO ANY REMAINING INERT SOLIDS IN THE COMPOSITION OF AT LEAST 1 TO 1; (B) AN EMULSIFIER COMPONENT COMPRISING MONOVALENT, SUBSTANTIALLYNEUTRAL SOAP OF FATTY ACIDS HAVING 12 TO 20 CARBON ATOMS AS THE PRINCIPAL EMULSIFIER AND AS THE SOLE IONIC EMULSIFIER IN SAID COMPOSITION, SAID SOAP BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL SOAPS, AMMONIUM SOAPS, ORGANIC AMINE SOAPS AND MIXTURES THEREOF; AND (C) AT LEAST ONE DISPERSED ALKALI-SOLUBLE, ACID PRECIPITABLE PROTEIN; SAID INERT SOLIDS, SAID EMULSIFIER COMPONENT AND SAID PROTEIN FORMING A SUBSTANTIALLY HOMOGENEOUSLY DISPERSED PHASE IN A CONTINUOUS AQUEOUS PHASE, AND SAID EMULSIFIER COMPONENT AND PROTEIN BEING PROPORTIONED AS FOLLOWS: