Ashless antioxidant lubricating oil additive

Details Ashless antioxidant lubricating oil additive Ashless antioxidant lubricating oil additive

1995-06-07

1996-09-24

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

508224ECW, C07F 9165

Patent

active

055592651

ABSTRACT:
A method for producing an ashless, antioxidant lubricating oil additive. The method comprises:
(a) reacting an alcohol with phosphorus pentasulfide to form a dithiophosphoric acid intermediate;
(b) treating the dithiophosphoric acid intermediate with an expoxide to yield a corresponding dithiophosphoric ester alcohol product; and
(c) recovering the dithiophosphoric ester alcohol product lubricant oil additive.

REFERENCES:
patent: 2895984 (1959-07-01), McCall et al.
patent: 3004996 (1961-10-01), Arakelian et al.
patent: 3341633 (1967-09-01), Asseff
patent: 3654154 (1972-04-01), Braid

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