Maleic Anhydride used in production of unsaturated polyester resins. It also is used in coating, pharmacenties, Maleic anhydride Chemical ... ,forming maleic acid.UseMainly used in production of unsaturated polyester resins. It also is used in coating, pharmacenties, agricultural ... oil products and plastics, surfactant, etc. It is used production of 1.4 butanediol, etc.Storage and PackageIn plastics ...