General Electric Company

Crompton Gmbh

Borg-warner Chemicals, Inc.

Gary Vincent Marlin

William P Enlow

James F York

Process for the preparation of hindered phosphites

Reaction of a phenol with a metal salt of an alcohol produces a metal phenolate salt of a phenol. When a hindered phenol is used a hindered metal phenolate is produced. Such hindered metal phenolate salts are useful in driving the synthesis reaction of hindered phenol esters and phosphite esters to completion.

Method of making metal salts of 2,4,6-tri-t-butylphenol

A process for producing organo-phosphites of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each 2,4-di-tert-butyl and R.sup.3 is hydrogen is provided. The process involves heating a mixture of a pentaerythritol bis-phosphorohalidite and a phenolic compound and applying a vacuum of at least about 10 inches of mercury wherein the temperature of the reaction mixture is maintained between about 30.degree. C. and about 140.degree. C. Conversions to the organic spiro bis-phosphite is at least twice that of the same process without a vacuum.

Process for the preparation of spiro bis-phosphites

A process for producing organo-phosphites of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each 2,4-di-tert-butyl and R.sup.3 is hydrogen is provided. The process involves heating a reaction mixture containing pentaerythritol wherein the pentaerythritol has an average particle size of about 250 microns or less, preferably the pentaerythritol has an average particle size of about 150 microns or less, phosphorous trihalide, a phenolic compound of the formula: ##STR2## wherein each R.sup.1 and R.sup.2 is t-butyl and R.sup.3 is hydrogen, a solvent selected from the group consisting of heptane, hexane, octane, xylene, toluene, and mixtures of the solvents containing at least one of the aforementioned and a catalyst. The process utilizing the aforementioned pentaerythritol particle size has the unexpected advantages of short reaction times as compared to the same process using a larger pentaerythritol particle size.

Process for the preparation of spiro bis-phosphites using finely ground

An improved transesterification process for preparing bis-(2,4-dialkylphenyl) pentaerythritol phosphates using n-alkanes or cycloalkanes as solvents to provide high spiro/cage isomer ratios.

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Morgantown, WV, United States of America

Gary Vincent Marlin