Freeze-thaw stable styrene butadiene maleic acid interpolymer latex and paints

Claim 1

THE PROCESS FOR MAKING COATING COMPOSITIONS CONPRISING AQUEOUS DISPERSIONS STABLE TO ALTERNATING FREEZING AND THAWING, WHICH COMPRISES COPOLYMERIZING IN AN AQUEOUS EMULSION, A MIXTURE OF MONOMERS COMPRISING (A) A VINYL AROMATIC COMPOUND HAVING ONE VINYL GROUP ATTACHED TO AN AROMATIC RING AND CONTAINING FROM 8 TO 9, INCLUSIVE, CARBON ATOMS, (B) A 4-CARBON CHAIN CONJUGATED DIOLEFIN HYDROCARBON HAVING FROM 4 TO 5 INCLUSIVE, CARBON ATOMS, ADDING TO SAID MIXTURE AT A POINT DURING THE COPOLYMERIZATION, AT LEAST 1 PERCENT BY WEIGHT OF THE MIXTURE OF MONOMERS OF AT LEAST ACIDIC MEMBER SELECTED FROM THE GROUP CONSISTING OF MALEIC ACID AND MALEIC ANHYDRIDE, CONTINUING THE POLYMERIZATION THE THE PRESENCE OF SAID ACIDIC MEMBER TO FORM AN INTERPOLYMER OF SAID ACIDIC MEMBER, SAID VINYL AROMATIC COMPOUND AND SAID CONJUGATING DIOLEFIN WHEREIN THE VINYL AROMATIC COMPOUND IS COMBINED IN AN AMOUNT BETWEEN 40 AND 70 MOLE PERCENT IN THE POLYMER AND THEREAFTER ADJUSTING THE PH OF THE RESULTING EMULSION TO A PH GREATER THAN 7 WITH A MONOFUNCTIONAL BASE.