Patent GB-1277179-A (GB)
Title: Ester based lubricant compositions
Inventor: KEENAN JOHN FRANCIS EDMUND
IPC: C10M169/00
Filed: 1968-12-10
Abstract: 1277179 Lubricants CIBA-GEIGY (UK) Ltd 10 Dec 1969 [10 Dec 1968] 45060/71 Divided out of 1268907 Heading C5F Lubricants comprise a synthetic carboxylic ester and, as a metal corrosion inhibitor, a compound having the formula wherein R<SP>4</SP> is an amino group, an alkyl group having from 1 to 12 carbon atoms or an aryl group which is unsubstituted or hydroxysubstituted, or represents one of the groups having the formulµ or or in which R<SP>1</SP> is hydrogen or an alkyl group having from 1 to 12 carbon atoms which may be substituted with a carboxylic acid ester group, R<SP>2</SP> is an alkyl group having from 1 to 12 carbon atoms, which may be substituted with a carboxylic acid ester group, or represents the group -CH = N.NH.COR<SP>4</SP> wherein R<SP>4</SP> has its previous significance, or R<SP>1</SP> and R<SP>2</SP> together form a cycloalkyl residue having 5 or 6 carbon atoms unsubstituted or substituted with an alkyl group having from 1 to 6 carbon atoms, or are joined to form a 5-nitrofuryl group, and R<SP>3</SP> is an alkylene residue having from 1 to 12 carbon atoms; a vinylene residue; or a phenylene residue. Examples of such compounds include acetic acid cyclohexylidene hydrazide, n-heptanoic acid cyclohexylidene hydrazide, fumaric acid di-(cyclohexylidene hydrazide), fumaric acid di - (2 - n - butylcyclohexylidene hydrazide), glyoxal di-(heptanoic hydrazide), succinic acid di-(cyclohexylidene hydrazide), adipic acid di-(cyclopentylidene hydrazide), adipic acid di- (cyclohexylidene hydrazide), sebacic acid di- (cyclohexylidene hydrazide), sebacic acid di- (heptylidene hydrazide), dodecane-1,12-dioic acid di - (cyclohexylidene hydrazide), terephthalic acid di-(cyclohexylidene hydrazide), N : N<SP>1</SP> - di - (cyclohexylidene carbohydrazide), methyl hexyl ketone semi-carbazone, cyclohexanone semicarbazone, acetophenone semicarbazone, adipic acid di-(5-nitrofurfurylidene hydrazide), oxalic acid di-(4-n-carbobutoxybut-2-ylidene hydrazide), adipic acid di-(4-ncarbobutoxybut - 2 - ylidene hydrazide) and adipic acid di-(2-octylidene hydrazide). Suitable synthetic carboxylic acid esters include di-esters of a dibasic acid and a monohydric alcohol, for example, dioctyl sebacate or dinonyl adipate, tri-esters of trimethylol propane and monobasic acids or mixtures of such acids, for instance, trimethylol propane tripelargonate, trimethylol propane tricaprylate or mixtures thereof, tetraesters of pentaerythritol and monobasic acids or mixtures thereof, for example, pentaerythritol tetracaprylate, pentaerythritol tetraheptanoate or mixtures thereof, acid end-stopped complex esters derived from monobasic acids, dibasic acids and polyhydric alcohols, for instance, a complex ester derived from trimethylol propane, caprylic acid and sebacic acid, alcohol end-stopped complex esters derived from monohydric alcohols, dibasic acids and polyhydric alcohols, for instance, a complex ester derived from iso-octanol, sebacic acid and an alkylene glycol. The lubricant may include a diarylamine, phenothiazine or iminodibenzyl antioxidant.