Compositions for and methods of inhibiting the discoloration of alkylated phenols
Abstract
Abstract THE DISCOLORATION OF ALKYLATED PHENOLS IS INHIBITED BY THE ADDITION OF AN ORGANIC PHOSPHITE TO THE ALKYLATED PHENOL OR COMELT OF THE ALKYLATED PHENOL WITH THIODIPROPIONIC ACID ESTERS. THE PHOSPHITE SUCH AS TRIS NONYLPHENYL PHOSPHITE MAY BE INCORPORATED ASS AN ADDITIVE TO THE MELTED PRODUCT OR DURING PROCESSING PROVIDED THAT IT IS INCORPORATED AND THE STABILIZED PRODUCT PROCESSED UNDER SUBSTANTIALLY NONHYDROLYSIS CONDITION I.E. AVOIDANCE OF AQUEOUS SOLUTION, HEAT AND ACIDS. FOR EXAMPLE, BUTYLATED HYDROXY TOLUENE IS PREVENTED FROM YELLOWING IN STORAGE BY THE ADDITION OF TRIS NONYLPHENYL PHOSPHITE TO THE MELT OR COMELT OF THE FINAL PRODUCT OR WHEN IT IS INCORPORATED AT A POINT IN THE ALKYLATION PROCESS WHICH AVOIDS LATTER HYDROLYSIS OF THE PHOSPHITE SO INCORPORATED.
Inventors
- 👤 Charles P Riley Jr
Bibliographic Details
Claims Analysis
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