Styrene modified alkyds and process of producing the same

Claim 1

A COATING COMPOSITION COMPRISING AN INTERPOLYMER FORMED BY HEATING THE PRESENCE OF A CATALYST (1) A MODIFIED ALKYD RESIN IN AN INERT AROMATIC SOLVENT AND (2) STYRENE, THE ALKYD RESIN BEING DERIVED FROM THE REACTION OF POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF GLYCERINE AND A MIXTURE OF GLYCERINE AND GLYCOL WITH A CARBOXYLIC COMPOUND A MAJOR PORTION OF WHICH IS AN AROMATIC CARBOXYLIC COMPOUND SELECTED FROM A GROUP CONSISTING OF PHTHALIC ANHYDRIDE AND PHTHALIC ACID, AND A MINOR PROPORTION OF WHICH CONSISTS OF AT LEAST ONE UNSATURATED COMPOUND SELECTED FROM A GROUP CONSISTING OF A MALEIC, FUMARIC, ITACONICM SORBIC ACIDS AND THEIR ANHYDRIDES, THE ALKYD RESIN BEING MODIFIED WITH AT LEAST ONE MEMBER OF A GROUP CONSISTING OF NON-DRYING AND SEMI-DRYING OILS AND THEIR FATTY ACIDS, THE STYRENE CONTENT OF THE INTERPOLYMER BEING APPROXIMATELY WITHIN THE RANGE OF 20 TO 60% OF THE INTERPOLYMER, THE PERCENTAGE OF OIL OR OIL ACID IN THE ALKYD BEING ABOUT 30 TO 80% CALCULATED AS OIL AND CONSISTING ESSENTIALLY OF SAID NON-DRYING OR SEMI-DRYING OILS OR THEIR FATTY ACIDS AND THE PERCENTAGE OF INERT SOLVENT EMPLOYED DURING INTERPOLYMERIZATION BEING APPROXIMATELY WITHIN THE RANGE OF 35 TO 50%.