Patent GB-649331-A (GB)
Title: Corrosion-preventive composition
IPC: C23F11/10
Filed: 1947-09-26
Abstract: Esters derived from dibasic ether acids of the general formula COOH-R6-O-R7-COOH, where R6 and R7 are similar or dissimilar saturated hydrocarbon radicals, e.g. a ,a 1-dilauric, dimyristic, dipalmitic, distearic, diarachic and dioleic acid ethers, are produced by reacting the alkali salt of an a -hydroxy carboxylic acid with an a - or b -monochloro- or monobromofatty acid.ALSO:A corrosion-preventive lubricant comprises an ester of an aliphatic dicarboxylic acid and an aliphatic monohydric alcohol with 2 to 20 carbon atoms, having dispersed therein 1 to 4 per cent by weight of a fatty or unsaturated monocarboxylic acid with at least 7 carbon atoms, or a sulphurized unsaturated monocarboxylic acid or an alkyl phosphoric acid with at least 10 carbon atoms in an alkyl substituent.  The esters, e.g. 2-methylheptyl or 2-ethylhexyl adipate, dihexyl, 3-methylheptyl, or 3,3-di-isopropyl hexyl pimelate and 2-ethylhexyl sebacate, are of the formula <FORM:0649331/III/1> in which n is preferably 1, R1 with R4 and R5 forms a saturated hydrocarbon radical with 4 to 12 carbon atoms, and R2 and R3 a similar radical with 4 to 20 carbon atoms derived from hydrocarbons such as 1,1- and 1,2-dimethyl, 2,3-di-isopropyl and 3,3-dipropyl ethane; 2- or 3-ethyl, 2,2- or 2,3-dimethyl, 3-amyl, 2,3-diethyl, and 2-methyl-3-ethyl propane; butane and 2- or 3-methyl, 2,2- and 2,3-dimethyl, 2-, 3- or 4-ethyl, 3,4-diethyl, 2-, 3- or 4-butyl butane; pentane or 2-, 3- or 4-methyl, 2-, 3- or 4-ethyl, 3,3-diethyl pentane; hexane or 2-, 3-, 4- or 5-methyl, 2-, 3- or 4-ethyl, 2,2- and 3,3-dimethyl, 2-ethyl-3-methyl, and 3,6-dibutyl hexane; heptane; octane and 2-isopropyl-4-butyl, 2-butyl-5-ethylhexyl octane; and nonane. Acids used to form the esters are of the general formula COOH-R1-COOH, in which R1 is a hydrocarbon radical of 4 to 12 carbon atoms, e.g. glutaric, adipic, pimelic, suberic, azelaic or sebacic acids, and their derivatives, or R1 is R6-X-R7-, X being oxygen, sulphur or nitrogen and R6 and R7 being saturated hydrocarbon radicals with 2 to 20 carbon atoms, e.g. a ,a 1-dilauric, dimyristic, dipalmitic, distearic, diarachic, and dioleic acid ethers, a ,a 1-dimyristic, dipalmitic, distearic, diarachic, dibehenic, acid sulphides, tertiary amine derivatives such as anilino, toluidino or xylidino di-alpha fatty acids, p-phenylene-dithio-a ,a 1-di-stearic acid or a ,b -dilauryldithio- and monothiolauryl-succinic acids.  The acid anticorrosive additive may be saturated, e.g. enanthylic, caprylic, pelargonic, capric, undecylic, lauric, tridecoic, myristic, pentadecanoic, palmitic, margaric, stearic, carnaubic, cerotic, psyllic acids; unsaturated, e.g. teracrylic, hypogeic, oleic, elaidic, erucic and behenic acids, or linoleic, linolenic, amylpropiolic, palmitolic, stearolic acids, or mixtures derived from oils such as linseed, rapeseed, cottonseed, soya bean, corn, rice, sesame, or mustard seed; sulphurized oleic acid or mono- or di-esters of phosphoric acid, e.g. mono- or di-lauryl phosphates. The anti-corrosive properties of the compositions may be increased by addition of 0.25 to 5 per cent of a salt or ester of a monobasic acid, e.g. glycerol mono-, di- or tri-oleates, stearates or laurates; sorbitol or mannitol mono-oleate or laurate; derivatives of petroleum sulphonic acids, e.g. green or mahogany acids; Mg, Ca, Sr, Ba, Al, Zn, Cd, Sn, Co, or Ni salts of sulphonated alkyl benzenes, naphthalenes, anthracenes, picenes, chrysenes, and diphenyls; lauric, stearic, oleic, arachic, behenic, ricinoleic, naphthenic, wool fat, alkylbenzoic, naphthoic, phenylacetic acids or tall oil derivatives esterified preferably with erythritol, arabitol, quinteryl glycerin, diethylglycerol, mesicerin and perseitol.  Oxidation inhibitors, extreme pressure agents, pour-point depressants, anti-wear, sludge-preventing compounds and detergents may be added.  The Specification as open to inspection under Sect. 91 comprises also esters in which X in the above formula represents Se or Te, and those derived from hydroxy, ketonic, amino and sulphonic acids, including those derived from petroleum fractions, thiocarbonic, resin acids or polybasic anhydrides, e.g. maleic. Examples are octadecenyl succinic, 4-isohexylhexahydro phthalic, phenyl vinyl phosphonic and 3,5-di-isopropyl salicylic acids.  The corrosion preventive acids comprise also acrylic, methacrylic, di-methacrylic, crotonic, isocrotonic, vinyl acetic, tiglic, angelic, senecioic, hexenic, sorbic, propiolic, 2-butynoic, and 2-pentynoic acids.  This subject-matter does not appear in the Specification as accepted.