Dimethyl-5-sodiosulfoisophthalate:

Used in the synthesis of polyester as the third monomer, which can improve processing and dyeing ability of polyester. It can also be used as the catalyst in organic synthesis, macromolecular synthesis, and fine chemistry. 5-sodiumsulfo Bis-isophthalate(SIPE) is the solution of SIPM, which is added at the synthesis of polyester as the third monomer, SIPE produces little methanol, which can reduce production costs .