Process for the production of substantially monoester-free diary

Details Process for the production of substantially monoester-free diary Process for the production of substantially monoester-free diary

1986-12-30

1988-04-12

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528180, C08G 6322

Patent

active

047375698

ABSTRACT:
An improved process for the preparation of a diaryl ester containing only small amounts of the corresponding monoesters comprises reacting a mixture of an aryl diacid, a monohydroxy aromatic compound and a catalyst, cooling, adding a controlled amount of water, and cooling further. Typically, diaryl esters, such as diphenyl isophthalate (DPI), containing only about 1-5% of the monoester, such as monophenyl isophthalate are obtained upon addition to the reaction mixture of approximately 5-15% by weight of water at 60.degree.-80.degree. C., followed by cooling to about 15.degree.-35.degree. C.

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