Patent GB-924418-A (GB)
Title: Lubricant composition
IPC: C08F22/36
Filed: 1960-04-05
Abstract: Lubricating compositions comprise a mineral or synthetic lubricating oil and 0,1 to 10% by weight of a copolymer of (A) a polymerizable compound having a single ethylenic linkage and containing a monovalent hydrocarbon group of 4 to 30 carbon atoms and (B) a N-amino substituted alkyl imide of an a ,B- ethylenically unsaturated a ,b -dicarboxylic acid containing 4 to 12 carbon atoms in which any alkyl groups of the acid contain 1 to 4 carbon atoms and in which the imide nitrogen is attached to an amino-substituted alkyl group having 1 to 7 carbon atoms in the alkyl group, said polymer having a molecular weight of at least 50,000 and said monomers being present in the polymer in the ratio of 1 to 20 units of (A) for each unit of (B).  Many suitable monomers are listed and copolymers specified include those of dodecyl methacrylate and N-dimethylaminopropyl maleimide; octadecyl acrylate and the imide of maleic acid and tetraethylene pentamine; allyl stearate and the imide of maleic acid and diethylene triamine; dodecyl methacrylate, octadecyl methacrylate and the imide of citraconic acid and 3-dimethylaminopropylamine; dodecyl methacrylate and the imide of itaconic acid and diethylene triamine; dodecyl methacrylate, octadecyl methacrylate and the imide of maleic acid and tetraethylene pentamine; and dodecyl methacrylate, octadecyl methacrylate, polyethylene glycol methacrylate and the imide of maleic acid and tetraethylene pentamine.  The oil may be a paraffin or naphthenic base oil or a synthetic hydrocarbon or non-hydrocarbon oil, e.g. alkylated waxes, hydrogenated hydrocarbon polymers and condensation products of chlorinated hydrocarbons and aromatic compounds, propylene and/or ethylene oxide polymers, the acetate of the 2-ethylhexanol initiated polymer of propylene oxide, di(2-ethylhexyl) sebacate, tricresyl phosphate and silicate esters. The compositions may also comprise conventional additives, e.g. zinc butyl hexyl dithiophosphate.ALSO:Oil-soluble copolymers of (A) a polymerizable compound having a single ethylenic linkage and containing a monovalent hydrocarbon group of 4 to 30 carbon atoms and (B) a N-amino substituted alkyl imide of an a ,b -ethylenically unsaturated a ,b -dicarboxylic acid containing 4 to 12 carbon atoms in which any alkyl groups of the acid contain 1 to 4 carbon atoms and in which the imide nitrogen is attached to an amino-substituted alkyl group having from 1 to 7 carbon atoms in the alkyl group, said polymer having a molecular weight of at least 50,000 and said monomers being present in the polymer in the ratio of 1 to 20 units of (A) for each unit of (B), may be prepared by polymerizing the monomers in bulk, emulsion or preferably in solution, e.g. in benzene, toluene, xylene or petroleum naphtha, in the presence of a catalyst, e.g. benzoyl peroxide, acetyl peroxide, tert. butyl hydroperoxide, di tert. butyl peroxide, dibenzoyl peroxide, di tert. amyl peroxide, 1,11-azo dicyclohexanecarbonitrile or a -a 1-azo diisobutyronitrile.  The copolymers may also be prepared by copolymerizing monomers the units of which are convertible to the required units, e.g. by copolymerizing unsaturated acids and alcohols and esterifying, and acids, acid anhydrides, acid chlorides or half esters and forming the desired imide.  Many suitable monomers are listed and specified copolymers are of dodecyl methacrylate and N-dimethylaminopropyl maleimide; octadecyl acrylate and the imide of maleic acid and tetraethylene pentamine; allyl stearate and the imide of maleic acid and diethylene triamine; dodecyl methacrylate, octadecyl methacrylate and the imide of citraconic acid and 3-dimethylaminopropyl amine; and dodecyl methacrylate and the imide of itaconic acid and diethylene triamine.  Examples describe (I) the copolymerization of dodecyl methacrylate, octadecyl methacrylate and maleic anhydride and the imidization thereof with (II) tetraethylene pentamine, and (III) the copolymerization of dodecyl methacrylate, octadecyl methacrylate, polyethylene glycol methacrylate and maleic anhydride and the imidization thereof with (IV) tetraethylene pentamine.  The copolymers may be added to lubricating oils.