Witco Corporation

R David Peveler

Michael H Fisch

Michael E Gelbin

Surinder Ahluwalia

Disclosed is a fluorophosphite compound of the formula ##STR1## This compound shows superior performance as a stabilizer in polymers, such as polypropylene, and polyvinyl chloride. Also disclosed is a process for making this compound.

Polycyclic fluorophosphites useful as stabilizers

Disclosed is a process for making compounds of the formula ##STR1## by reacting phosphorus trihalide with the corresponding phenol and fluorinating the resulting halophosphite intermediate, in the presence of a catalyst which comprises dimethylformamide.

Process for making aryl fluorophosphites useful as stabilizers

Nonylphenyl neopentylene phosphite, or stated in terms of systematic nomenclature 5,5-dimethyl-2-nonylphenoxy-1,3,2-dioxaphosphorinane, compositions effective to stabilize cellulose ester resins against the degradative effects of heat and processing are disclosed. In accordance with the present invention, preferred stabilizing compositions for cellulose ester resins include nonylphenyl neopentylene phosphite in combination with epoxidized linseed oil. These stabilizing compositions demonstrate their stabilizing effectiveness by maintaining the melt viscosity of the polymer during hot working and minimizing discoloration of the polymer when heated.

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Woodcliff Lake, NJ, United States of America

R David Peveler