Patent GB-753908-A (GB)
Title: Synthetic lubricants comprising complex phosphorus-containing esters
IPC: C07F9/09
Filed: 1954-04-22
Abstract: A lubricating composition comprises a synthetic ester lubricant obtained by reacting a monocarboxylic aliphatic acid having from 6 to 20 carbon atoms per molecule or its acid chloride with a hydroxy phosphate obtainable by reacting an alkylene oxide with phosphoric acid (see Group IV (b)) and an additive which may be an ester polymer or copolymer with other polymerizable materials, e.g. a copolymer of a fumarate or maleate ester with vinyl acetate, or an acrylate or methacrylate ester polymer or copolymer.  The synthetic lubricant is preferably one having the formula [RC(O).O.(R1O)n]3P=O wherein R is a monovalent aliphatic hydrocarbon radical containing from 5 to 19 carbon atoms, R1 is a divalent hydrocarbon radical having a chain containing from 2 to 4 carbon atoms and n averages from 1 to 10.  R1 is preferably the ethylene radical and R is preferably the radical derived from an oxo acid.ALSO:The invention comprises a synthetic lubricant comprising an ester obtained by reacting a monocarboxylic aliphatic acid having from 6 to 20 carbon atoms per molecule or its acid chloride with a hydroxy phosphate obtainable by reacting an alkylene oxide with phosphoric acid.  The preferred lubricants are those having the general formula [R.C(O).O(R1O)n]3P(O) wherein R is a monovalent aliphatic hydrocarbon radical containing from 5 to 19 carbon atoms, R1 is a divalent hydrocarbon radical having a chain containing from 2 to 4 carbon atoms and n averages from 1 to 10.  The radical R1 is preferably an ethylene radical and the radical R is preferably derived from an oxo acid. The reaction of the alkylene oxide and phosphoric acid is preferably carried out in the presence of phosphorus pentoxide. Specified alkylene oxides are ethylene oxide, propylene oxide and butylene oxide.  Mixtures of these or of other alkylene oxides may be used.  The carboxylic acids used may be of either branched or straight chain configuration and a mixture of the acids may be employed.  One, two or three mols. of the carboxylic acid may be reacted with each mol. of the hydroxy phosphate.  In examples a hydroxy phosphate is formed by bubbling ethylene oxide into a mixture of phosphoric acid and phosphorus pentoxide while maintaining the temperature at 50-60 DEG  C. and the product is stripped to constant weight to yield the hydroxy-phosphate which is then esterified with a C9 oxo acid (derived from di-isobutylene) in the presence of toluene and p. toluene sulphonic acid or with a C12 oxo acid chloride obtained from a C12 oxo alcohol derived from the C11 olefin fraction of a polypropylene.  The products may be blended with oil additive agents or with other lubricants (see Groups III and IV (a)).ALSO:A lubricating composition comprises a synthetic ester lubricant obtained by reacting a monocarboxylic aliphatic acid having from 6 to 20 carbon atoms per molecule or its acid chloride with a hydroxy phosphate obtainable by reacting an alkylene oxide with phosphoric acid (see Group IV(b)) and an additive agent which may be a viscosity index improver, pour point depressant, detergent inhibitor or oxidation inhibitor.  The synthetic lubricants may also be blended with other additives or with other lubricants such as mineral lubricating oils or with other synthetic lubricants such as formals dibasic acid esters, complex esters or polymerized hydrocarbons.  Specified additives are ester polymers and co-polymers with other polymerizable materials such as copolymers of fumarate or inaleate esters with vinyl acetate, acrylate or methacrylate polymers or copolymers, phenyl alpha naphthylamine, phenothiazine, and 2, 6-di-tert. butyl-paracresol. The synthetic lubricant is preferably one having the formula [R.C(O).O.(R1O)n]3P=O wherein R is a monovalent aliphatic hydrocarbon radical containing from 5 to 19 carbon atoms, R1 is a divalent hydrocarbon radical having a chain containing 2 to 4 carbon atoms and n averages from 1 to 10.  The synthetic lubricants may be thickened to grease compositions by using any of the common grease forming soaps, e.g. the oleates, stearates hydroxy stearates, or ricinoleates of sodium, potassium, lithium, calcium, barium, strontium, or aluminium or the soaps formed by heating animal, fish, or vegetable oils with soda, lime, barium hydrate or lithium hydrate.