The primary use of phthalic anhydride (PA) is as a chemical intermediate in the production of plastics from vinyl chloride. Phthalate esters, which function as plasticizers, are derived from phthalic anhydride. Phthalic anhydride is also used in the production of alkyd resins and polyester resins which are further used in paints and lacquers, certain dyes … Continue reading Phthalic Anhydride (PA)