Patent GB-932424-A (GB)
Title: Aromatic ethers
IPC: C09K5/08
Filed: 1959-10-13
Abstract: The invention comprises a meta-linked unsubstituted polyphenyl polyether of the formula <FORM:0932424/III/1> in which n is an integer of at least 3, and mixtures thereof (see Group IV(b)). Examples describe the preparation of polyethers where n has the values 3, 4, 5 and 6.  The products are liquid over a wide temperature range (at least from atmospheric temperature to 800 DEG F.) and are useful as lubricants or hydraulic fluids.  For these purposes they may be used alone or in admixture with up to 50% of the corresponding para-linked compounds or isomers containing a mixture of meta- and para-linked compounds. A minor proportion of a viscosity-index improver, an antioxidant, a pour-point depressant or a dye may be included in the compositions.ALSO:The invention comprises a meta-linked unsubstituted polyphenyl polyether of the formula <FORM:0932424/IV(a)/1> in which n is an integer of at least 3, and mixtures thereof, and a process for their preparation by heating together, e.g. at 220 DEG -250 DEG C., a halogenated compound of the formula <FORM:0932424/IV(a)/2> in which X is a halogen atom, preferably bromine, X1 is a hydrogen or halogen atom and y is zero or an integer not greater than (n-1), and an alkali metal salt of a phenol of the formula <FORM:0932424/IV(a)/3> in which M is an alkali metal, preferably potassium, M1 is a hydrogen atom or the group OM, at least one of X1 and M1 being a hydrogen atom, and z is zero or an integer not greater than (n-1), the sum of (y+z) being equal to (n-1), in the presence of metallic copper, copper hydroxide, a copper salt or mixtures thereof.  Examples describe the preparation of polyethers where n has the values 3, 4, 5 and 6.  The products are liquid over a wide temperature range (at least from atmospheric temperature to 800 DEG F.) and are useful as lubricants, hydraulic fluids, heat-transfer liquids or dielectric media.  For these purposes they may be used alone or in admixture with up to 50% of the corresponding para-linked compounds or isomers containing a mixture of meta- and paralinked compounds.  A minor proportion of a viscosity-index improver, an antioxidant, a pour-point depressant or a dye may be included in the compositions.ALSO:The invention comprises a metal-linked unsubstituted polyphenyl polyether of the formula <FORM:0932424/IV(a)/1> in which n is an integer of at least 3, and mixtures thereof, and a process for their preparation by heating together, e.g. at 220-250 DEG C., a halogenated compound of the formula <FORM:0932424/IV(a)/2> in which X is a halogen atom, preferably bromine, X1 is a hydrogen or halogen atom and y is a zero or an integer not greater than (n - 1), and an alkali metal salt of a phenol of the formula <FORM:0932424/IV(a)/3> in which M is an alkali metal, preferably potassium, M1 is a hydrogen atom or the group OM, at least one of X1 and M1 being a hydrogen atom, and Z is zero or an integer not greater than (n - 1), the sum of (y + z) being equal to (n - 1), in the presence of metallic copper, copper hydroxide, a copper salt or mixtures thereof.  Examples describe the preparation of polyethers where n has the values 3,4,5 and 6.  The products are liquid over a wide temperature range (at least from atmospheric temperature to 800 DEG F.) and are useful as lubricants, hydraulic fluids, heattransfer liquids or dielectric media.  For these purposes they may be used alone or in admixture with up to 50% of the corresponding para-linked compounds or isomers containing a mixture of meta- and para-linked compounds.  A minor proportion of a viscosity-index improver, an antioxidant, a pour-point depressant or a dye may be included in the compositions.