Patent GB-835443-A (GB)
Title: Phosphate ester compositions
IPC: C07F9/12
Filed: 1956-11-02
Abstract: A lubricating composition or hydraulic fluid comprises a linear polyester of a di-(hydroxyaryl) alkane and a phosphonic acid or a monoester of phosphoric acid, together with another phosphoric acid ester, the polyester being present in an amount corresponding to 0.5-15% by weight of the composition.  The polyester may be prepared by reacting a di-(hydroxyaryl) alkane (or an aqueous solution of the sodium salt thereof) with a phosphoryl dichloride monoester, or with a dichlorophosphonic acid, and continuing the reaction until the polyester has on the average at least 6, and preferably 20-100, recurring structural units in the chain. Suitable di-(hydroxyaryl) alkanes are di - (4 - hydroxy - 3 - methylphenyl) mono- or di-methyl methane, di-(4-hydroxyphenyl) di-methyl methane, di-(4-hydroxy phenyl) methylethyl methane and di-(4-hydroxy-3-methylphenyl) phenyl methane.  They may be reacted with monomethyl, monoethyl, monopropyl, monobutyl or monophenyl phosphoryl dihalides, or with monomethyl, monoethyl, monopropyl or monophenyl phosphonyl dihalides, to form the polyesters.  There may be present in the reaction mixture a small proportion of a monofunctional reactant, such as a hydroxy-aryl compound, to assist in obtaining a polyester of the desired chain length.  The second phosphoric acid ester, forming an ingredient of the lubricating composition, may be an alkyl, aryl, or mixed alkyl aryl ester of phosphoric acid.  In the examples, compositions are described consisting of tricresyl phosphate and the polyester formed by the reaction between the disodium salt of di-(4-hydroxyphenyl) dimethylmethane and benzene phosphonyl dichloride or methyl phosphoryl dichloride.ALSO:A linear polyester of a di (hydroxyaryl) alkane and a phosphonic acid or a mono-ester of phosphoric acid is employed in admixture with a phosphonic acid or a mono-ester of phosphoric acid as a lubricating composition or hydraulic fluid (see Group III).  The polyester may be prepared by reacting a di (hydroxyaryl) alkane (or an aqueous solution of the sodium salt thereof) with a phosphoryl dichloride mono-ester, or with a dichlorophosphonic acid, and continuing the reaction until the polyester has on the average at least 6, and preferably 20-100, recurring structural units in the chain.  Suitable di (hydroxyaryl) alkanes are di (4-hydroxy - 3 - methylphenyl) mono - or dimethyl methane, di (4-hydroxyphenyl) dimethyl methane, di (4-hydroxyphenyl) methyl ethyl methane and di (4-hydroxy-3-methyl phenyl) phenyl methane.  They may be reacted with monomethyl, monoethyl, monopropyl, monobutyl or monophenyl phosphoryl dihalides, or with monomethyl, monoethyl, monopropyl or monophenyl phosphonyl dihalides, to form the polyesters.  There may be present in the reaction mixture a small proportion of a monofunctional reactant, such as a hydroxy-aryl compound, to assist in obtaining a polyester of the desired chain length.  In the examples, the preparation of polyesters is described, by the reaction between the disodium salt of di (4-hydroxyphenyl) dimethyl methane and benzene phosphonyl dichloride or methyl phosphoryl dichloride.