Patent GB-1031079-A (GB)
Title: Lubricating oils containing corrosion inhibitors
IPC: C10M133/56
Filed: 1963-08-29
Abstract: A lubricating oil composition includes an additive that consists of the terephthalic acid salt of a succinimide derivative of the general formula <FORM:1031079/C4-C5/1> wherein R is an alkenyl radical having from 30 to 200 carbon atoms and A is an amine group represented by the general formula <FORM:1031079/C4-C5/2> wherein R1 is ethylene or propylene, x is a number of from 0 to 10, R11 is a divalent alkylene radical, R2 and R3 are alkyl radicals, the sum of the carbon atoms in R11, R2 and R3 being from 3 to 10, R4 is an alkyl radical having from 1 to 3 carbon atoms and R5 is hydrogen or an alkyl radical having from 1 to 3 carbon atoms, and the weight ratio of the succinimide derivative to the terephthalic acid in the salt is less than 200: 1. R in the succinimide derivative is preferably derived from a polymer R-H of a 1-olefin containing 3 or 4 carbon atoms such as polymers of propylene or 1-butene/isobutene copolymers. Long lists of suitable amines are given.  In the examples a polyisobutylene is reacted with maleic anhydride and the product is further reacted with tetramethylene pentamine to form an N-substituted succinimide derivative which is treated with terephthalic acid either alone or in the presence of an S.A.E. 30 oil to form a salt which is added to lubricating oil compositions. Base oils exemplified are a California paraffin base oil of viscosity 500 SSU. at 100 DEG  F. and Midcontinent S.A.E. 30 base oils.  Other additives exemplified are the terephthalic acid salt of the reaction product of polyisobutenyl succinimide and b -aminoethyl piperazine, a mixed alkyl methacrylate vinyl pyrrolidone copolymer, an acetyl methacrylate polymer, zinc dithiophosphate, a zinc dialkyl dithiophosphate and tricresyl phosphate.  Other base oils specified are alkylene polymers, alkylene oxide polymers and derivatives thereof, esters of dicarboxylic acids, e.g. adipic, azelaic, suberic, sebacic, alkanol succinic, fumaric and maleic acid, with alcohols, e.g. butyl, hexyl, 2-ethyl hexyl and dodecyl alcohol, liquid esters of phosphorus acids, alkyl benzenes, polyphenyls, alkyl biphenyl ethers, silicon polymers, or mixtures thereof.ALSO:An additive for a lubricating oil (see Division C5) consists of the terephthalic acid salt of a succinimide derivative of the general formula <FORM:1031079/C3/1> wherein R is an alkenyl radical having from 30 to 200 carbon atoms and A is an amine group represented by the general formulae <FORM:1031079/C3/2> wherein R1 is ethylene or propylene, x is a number in the range of from 0 to 10, R11 is all divalent alkylene radical, R2 and R3 are alkyl radicals, the sum of the carbon atoms in R11, R2 and R3 being from 3 to 10, R4 is an alkyl radical having from 1 to 3 carbon atoms and R5 is hydrogen or an alkyl radical having from 1 to 3 carbon atoms, and the weight ratio of the succinimide derivative to the terephthalic acid in the salt is less than 200:1. R in the succinimide derivative is preferably derived from a polymer R-H of a 1-olefin containing 3 or 4 carbon atoms such as polymers of propylene or 1-butene/isobutene copolymers.  Long lists of suitable amines are given.  In the examples a polyisobutylene is reacted with maleic anhydride and the product is further reacted with tetramethylene pentamine to form an N-substituted succinimide derivative which is treated with terephthalic acid either alone or in the presence of an S.A.E. 30 oil to form a salt.