Patent GB-837679-A (GB)
Title: Mixtures of triaryl phosphates
IPC: C07F9/12
Filed: 1956-11-07
Abstract: Hydraulic systems contain as the operative fluid a triaryl phosphate mixture obtainable by reacting an ester-forming derivative of phosphoric acid with a mixture of phenol, cresols, xylenols, and higher alkyl monohydric phenols in which the alkyl group or groups of each phenol contain a total of 3 to 6 carbon atoms in such proportions as to give a product having a viscosity of 140 to 160 S.U.S. at 100 DEG  F. (see Group IV (b)).  The triaryl phosphate mixture is also useful as a lubricant.  Suitable phenol mixtures are those comprising by weight 6 to 10% phenol, 35 to 45% of meta- and para-cresol, 10 to 14% of ortho cresol, 25 to 35% of xylenols and 8 to 12% of the higher alkyl phenols, e.g. propyl phenol, methyl ethyl phenol and butyl phenol.ALSO:A triaryl phosphate mixture is obtained by reacting an ester-forming derivative of phosphoric acid with a mixture of phenol, cresols, xylenols and higher alkyl monohydric phenols in which the alkyl group or groups of each phenol contain a total of 3 to 6 carbon atoms in such proportions as to give a product having a viscosity of 140 to 160 S.U.S. at 100 DEG  F.  The invention also includes triaryl phosphate mixtures obtainable by such process. Specified ester-forming phosphoric acid drivatives are phosphorus-oxychloride, -pentoxide and -pentachloride.  It is preferred to use mixtures containing by weight 6 to 10% (preferably 8%) of phenol, 35 to 45% (preferably 40%) of meta-and para-cresol, 10 to 14% (preferably 12%) of ortho-cresol, 25 to 35% (preferably 30%) of xylenols and 8 to 12% (preferably 10%) of the higher alkyl phenols, e.g. propyl phenol, methyl ethyl phenol, and butyl phenol and an excess of 5 to 8% by weight of phenols is generally used.  A metal halide catalyst, e.g. aluminium chloride or magnesium chloride may be present.  The triaryl phosphate mixtures are useful as lubricants, as working fluids in hydraulic systems (see Group III) and as plasticizers for various thermoplastic materials (see Group IV (a)).ALSO:A thermoplastic material, e.g. polyvinyl chloride or a cellulosic thermoplastic such as a cellulose ester of a saturated aliphatic monocarboxylic acid containing 2 to 4 carbon atoms or a cellulose ether, e.g. ethyl cellulose, is plasticized with a triaryl phosphate mixture obtainable by reacting an ester-forming derivative of phosphoric acid with a mixture of phenol, cresols, xylenols and higher alkyl monohydric phenols in which the alkyl group or groups of each phenol contain a total of 3 to 6 carbon atoms in such proportions as to give a product having a viscosity of 140 to 160 SUS at 100 DEG  F. (see Group IV (b)).  Suitable phenol mixtures are those comprising by weight 6 to 10% (preferably 8%) of phenol, 35 to 45% (preferably 40%) of meta- and para-cresol, 10 to 14% (preferably 12%) of ortho cresol, 25 to 35% (preferably 30%) of xylenols and 8 to 12% (preferably 10%) of the higher alkyl phenols, e.g. propyl phenol, methyl ethyl phenol, and butyl phenol.  In an example, 40 parts of a triaryl phosphate mixture obtained by reacting a phenol mixture of the preferred composition given above with phosphorus oxychloride is blended with 60 parts of polyvinyl chloride and 1.0 part of lead stearate is added, all parts being by weight.