Patent GB-600810-A (GB)
Title: Improvements in or relating to lubricating oil compositions
Filed: 1944-08-17
Abstract: A lubricating oil composition which is noncorrosive towards metals contains a substance of the general formula:  <FORM:0600810/III/1> or a metal salt thereof, R1 and R2 being hydrogen or alkyl groups containing from 1 to 20 carbon atoms, at least one being an alkyl group, R3 and R4 being alkyl groups containing from 1 to 5 carbon atoms and n being 1 or 2.  The substances have slight detergent properties but other detergents may be added to the lubricating oil compositions.  The substances may be prepared as described in Specification 589,051, [Group IV]. In the examples, details are given of the preparation of concentrates in mineral lubricating oil of the following substances: (1) 2-hydroxy-3,5-di-tert.-amyl-41-diethylaminodiphenyl disulphide or its barium salt; (2) 2-hydroxy-3,5-di-tert.-amyl-41-dimethylaminodiphenyl disulphide or its barium salt; (3) 2-hydroxy-5-tert.-octyl-41-dimethylaminophenyl disulphide; (4) 2-hydroxy-3-methyl - 5 -tert. - butyl - 41 - dimethylaminodiphenyl disulphide; (5) 2-hydroxy-3,5-di-tert.-octyl 41-diethylaminodiphenyl disulphide; (6) 2 - hydroxy - 5 - dodecyl - 41 - diethylaminodiphenyl disulphide, and (7) 2-hydroxy-3,5-di-tert.-amyl-41-dimethylaminodiphenyl sulphide.  The Specification as open to inspection under Sect. 91 refers to a lubricating oil composition, comprising a predominating amount of a lubricating oil and an effective amount of a compound of the general formula:  <FORM:0600810/III/2> and/or a metal salt of such a compound, R1 and R11 being hydrogen or alkyl radicles, at least one being an alkyl radicle, R111 and R1111 being alkyl radicles of from one to five carbon atoms and n being 1 or 2.  This subject-matter does not appear in the Specification as accepted.ALSO:Substances of the general formula <FORM:0600810/IV(b)/1> or metal salts thereof are employed as additives for lubricating oils, R1 and R2 being hydrogen or alkyl groups containing from 1 to 20 carbon atoms, at least one being an alkyl group, R3 and R4 being alkyl groups containing from 1 to 5 carbon atoms and n being 1 or 2.  The substances may be prepared as described in Specification 589,051.  In these examples, details are given of the preparation of concentrates in mineral lubricating oil of the following substances: (1) 2-hydroxy-3,5-di-tert.-amyl-41-diethylaminodiphenyl disulphide or its barium salt; (2) 2-hydroxy-3,5-di-tert.-amyl-41-dimethylaminodiphenyl disulphide or its barium salt; (3) 2-hydroxy-5-tert.-octyl-41-dimethylaminophenyl disulphide; (4) 2-hydroxy-3-methyl-5-tert.-butyl-41-dimethylaminodiphenyl disulphide; (5) 2-hydroxy-3,5-di-tert.-octyl-41-diethylaminodiphenyl disulphide; (6) 2-hydroxy - 5 - dodecyl - 41 - diethylaminodiphenyl disulphide and (7) 2-hydroxy-3,5-di-tert.-amyl-41-dimethylaminodiphenyl sulphide. The Specification as open to inspection under Sect. 91 refers to lubricating compositions containing substances of the general formula <FORM:0600810/IV(b)/2> or metal salts thereof, R1 and R11 being hydrogen or alkyl radicles, at least one being an alkyl radicle, R111 and R1111 being alkyl radicles of from one to five carbon atoms and n being 1 or 2.  This subject-matter does not appear in the Specification as accepted.