Patent GB-763543-A (GB)
Title: Esters of condensates of mercaptans with alkylene oxides
IPC: C08K5/372
Filed: 1954-10-08
Abstract: Esters of condensates of 1 mol. of an alkyl mercaptan with 2-26 mols. of an alkylene oxide are useful as lubricants.  They have the formula <FORM:0763543/IV(a)/1> in which R is an alkyl radical of 8-16 carbon atoms and R111 is a branched chain alkyl group with 3-36 carbon atoms, R1 and R11 are either H or alkyl of 1 or 2 carbon atoms, n is 0-25, and the total number of carbon atoms per molecule is 20-130. Various suitable starting materials are mentioned and there is an example describing the preparation of a lubricant by addition of 2 1/2 mols. of ethylene oxide to 1 mol. of tert. dodecyl mercaptan followed by esterification with a C13 acid obtained by oxidation of the product of an oxo synthesis of a C12 olefin, carbon monoxide and hydrogen. The alkylene oxide is added slowly to the mercaptan at 10-60 DEG  C. with agitation and preferably with a catalyst, e.g. sodium hydroxide or sodium methoxide.  The products may be blended with other lubricants many of which are mentioned, including polybutene of mol. weight between 14,000 and 18,000 and conventional additives may also be included.  Specification 437,590, [Group IV], is referred to.ALSO:The invention comprises esters of condensates of 1 mol. of an alkyl mercaptan with 2-26 mols. of an alkylene oxide having the formula <FORM:0763543/IV(b)/1> in which R is an alkyl radical of 8-16 carbon atoms and R111 is a branched chain alkyl radical with 3-36 carbon atoms, R1 and R11 are either H or alkyl of 1 or 2 carbon atoms, n is 0-25, and the total number of carbon atoms per molecule is 20-130, which may be prepared by reacting the mercaptan with the alkylene oxide and esterifying the resulting product.  Various suitable starting materials are mentioned and there is an example describing the preparation of a lubricant by addition of 2 1/2 mols. of ethylene oxide to 1 mol. of tert. dodecyl mercaptan, followed by esterification with a C13 acid obtained by oxidation of the product of an oxo synthesis of a C12 olefin, carbon monoxide and hydrogen.  The alkylene oxide is added slowly to the mercaptan at 10-60 DEG  C. with agitation and preferably with a catalyst, e.g. sodium hydroxide or sodium methoxide.  The products may be used as lubricants (see Group III).  Specification 437,590, [Group IV], is referred to.ALSO:Esters of condensates of 1 mol of an alkyl mercaptan with 2-26 mols of an alkylene oxide are useful as lubricants.  They have the formula RS (R1CHCHR11O) <FORM:0763543/III/1> in which R is an alkyl radical of 8-16 carbon atoms, R111 is a branched chain alkyl radical with 3-36 carbon atoms, R1 and R11 are either H or alkyl of 1 or 2 carbon atoms, n is 0-25, and the total number of carbon atoms per molecule is 20-130. Various suitable starting materials are mentioned and there is an example describing the preparation of a lubricant by addition of 2 1/2 mols of ethylene oxide to 1 mol of tert. dodecyl mercaptan followed by esterification with a C13 acid obtained by oxidation of the product of an oxo synthesis of a C12 olefin, carbon monoxide and hydrogen. The products may be blended with other lubricants such as mineral oils, formals, silicone polymers, ethers, ether-esters, and glycol ethers. Polybutene of mol. wt. between 14,000 and 18,000, thickening agents such as metallic soaps of fatty acids, and conventional additives may also be included.  Specification 437,590 is referred to.