Dimethyl isophthalate

Dimethyl isophthalate (DMIP, CAS 1459-93-4) is a dimethyl ester of isophthalic acid, available under trade names including Morflex 1129 and RARECHEM AL BF 0071. It carries no assigned E-code and is classified under HS code 29173980 within the organic acids category.

In polyester and alkyd resin production, DMIP acts as a monomer that undergoes transesterification, incorporating the meta-oriented isophthalate unit to improve flexibility and chemical resistance in the cured network. It also functions as a crosslinker in powder coatings, reacting with hydroxyl- or amine-functional resins to build molecular weight and control film hardness.

DMIP is supplied as white to off-white flakes or crystalline powder and is subject to REACH registration requirements for EU import and use. Standard commercial grades are available for industrial polymer and coatings applications; buyers should confirm purity specifications and SDS documentation directly with the supplier prior to procurement.