|PIA CAS 121-91-5
|1,3-Benzenedicarboxylic Acid; m-Phthalic Acid
|238-240 °C (460-464 °F)
|Sparingly soluble in water; soluble in organic solvents (e.g., acetone, dichloromethane)
|Stable under normal storage conditions
PIA CAS 121-91-5 is an organic compound with the formula C6H4(CO2H)2. This colourless solid is an isomer of phthalic acid and terephthalic acid. These aromatic dicarboxylic acids are used as precursors (in form of acyl chlorides) to commercially important polymers, e.g. the fire-resistant material Nomex. Mixed with terephthalic acid, iso phthalic acid is used in the production of resins for drink bottles. The high-performance polymer poly benzimidazole is produced from iso phthalic acid.
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