フタル酸さんフタルさんMeanings1nounphthalic acidchemistryTechnical term in chemistry; refers to a benzene dicarboxylic acid used in the production of plastics, dyes, and plasticizers.フタル酸さんはプラスチックの原げん料りょうとして使つかわれる。Phthalic acid is used as a raw material for plastics.