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Isophthalic acid is an organic compound with the formula C6H42. This colorless solid is an isomer of phthalic acid and terephthalic acid. The main industrial uses of purified isophthalic acid are for the production of polyethylene terephthalate resin and for the production of unsaturated polyester resin and other types of coating resins.
Isophthalic acid is one of three isomers of benzenedicarboxylic acid, the others being phthalic acid and terephthalic acid.
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