IPA-Isophthalic acid

Isophthalic Acid

Isophthalic acid (PIA) is a non-toxic organic compound with the formula C6H4(CO2H)2. This colorless solid is an isomer of phthalic acid and terephthalic acid. These aromatic dicarboxylic acids are used as precursors (in the form of acylchlorides) to commercially important polymers. The high-performance polymer polybenzimidazole is produced from isophthalic acid.

Applications

PET (PolyEthylene Terephthalate) copolymer, which is used in bottle resins and to a much lesser extent, for fibers. PIA (Purified Isophthalic Acid) reduces the crystallinity of PET, which serves to improve clarity and increase the productivity of bottle-making.

Unsaturated polyester resins, where the addition of PIA improves thermal resistance and mechanical performance, as well as resistance to chemicals and water.

Polyester/alkyd surface coating resins, where PIA increases resistance to water, overall durability and weatherability.