Latex base exterior protective coating compositions

Claim 1

A POROUS EXTERIOR SURFACE POTECTIVELY COATED WITH (A) AN UNDERCOAT COMPRISING A PIGMENTED QUADRICOMPONENT INTERPOLYMER CONTAINING AN OIL AND (B) A TOP COAT COMPRISING A PIGMENTED QUADRICOMPONENT INTERPOLYMER, THE QUADRICOMPONENT INTERPOLYMER CONTAINING ABOUT (1) 35-60 PARTS OF AN UNSATURATED ESTER OF THE GROUP CONSISTING OF STRAIGHT-CHAIN AND BRANCHED-CHAIN SATURATED ALIPHATIC ALCOHOL ESTERS OF ACRYLIC AND METHACRYLIC ACID CONTAINING TOTAL OF ABOUT 5-20 CARBONS IN THE ALCOHOL RADICAL OF WHICH ABOUT 5-14 CARBON ATOMS COMPRISE THE LONGEST CONTINUOUS CHAIN THEREOF, (2) 3-10 PARTS OF AN UNSATURATED NITRILE OF THE GROUP CONSISTING OF ACRYLONITRILE AND METHACRYLONITRILE, (3) 2-5 PARTS OF AN UNSATURATED MONOCARBOXYLIC ACID OF THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID, CINNAMIC ACID, ATROPIC ACID AND CROTONIC ACID, AND (4) CORRESPONDINGLY, 60-25 PARTS BY WEIGHT OF A MONOVINYLIDENE AROMATIC HYDROCARBON, SAID QUADRICOMPONENT INTERPOLMER HAVING BEEN PREPARED BY (1) FIRST PARTIALLY POLYMERIZING ALL OF THE NITRILE COMPONENET WITH FROM 1.5-3 TIMES ITS WEIGHT OF VINYLIDENE AROMATIC HYDROCARBON COMPONENT AND THEN (2) ADDING THE REMAINING COMPONENTS AND (3) COMPLETING THE POLYMERIZATION REACTION, SAID UNDERCOAT CONTAINING PER 100 PARTS OF INTERPOLYMER FROM 20 TO 200 PARTS OF OIL SELECTED FROM THE GROUP CONSISTIGN OF DRYING OILS, SEMI-DRYING OILS, AND MIXTURE THEREOF SAID OILS CONTAINING A CATALYTIC AMOUNT OF A DRIER.