Dialkyl Tetrachlorophthalates as Plasticizers

Preparation and properties of tetrachloroterephthalate esters

“…Preparations of these diesters and others, some containing aromatic and halogenated aromatic nuclei, are described here. A comparison of properties of many of these compounds with the tetrachlorophthalates (8) is of further interest since both classes of materials are potential plasticizers (10,12).…”

“…For example, the diethyl and di-npropyl tetrachloroterephthalates have melting points of 129°C (10) and 91°C, respectively, while the corresponding ortho esters have melting points of 60°and 26°C. The dibutyl o-ester is a liquid at room temperature and has not been crystallized (8,12).…”