Patent GB-850913-A (GB)
Title: Lubricating grease compositions
IPC: C07D285/24
Filed: 1959-05-26
Abstract: Oil-soluble water-insoluble amino amides, suitable for use in the preparation of lubricating greases (see Group III), are prepared by heating fatty acids (having 16-20 carbon atoms per molecule, at least 50% by weight of the fatty acids containing at least 1 double bond per molecule) and a mixture of polyethylene polyamines (20-80% of the mixture being diethylene triamine and the remaining fraction being polyethylene polyamines having an average molecular weight within the range of 250-400) at a temperature of 200 DEG -225 DEG  C. for a reaction time of 1-4 hrs. in a ratio of 0,4-0,5 equivalents of fatty acids for each equivalent of polyamines.  The fatty acids used in preparing the amino amides may comprise oleic, linoleic or linolenic acids and also stearic acid (but not more than 50% of stearic acid) and may be derived from tallow or tall oil.  The mixture of polyethylene polyamines used in preparing the amino amides may comprise diethylene triamine, tetraethylene pentamine and higher homologues of the latter and may be obtained as the bottoms product in the process for the preparation of ethylene diamine by reacting ethylene dichloride with ammonia.ALSO:A lubricating grease composition comprises a major proportion of a hydrophobic lubricating oil thickened to a grease consistency by a bentonitic clay and a minor proportion of a waterproofing agent comprising oil-soluble water-insoluble amino amides made by heating fatty acids (having 16-20 carbon atoms per molecule, at least 50% by weight of the fatty acids containing at least 1 double bond per molecule) and a mixture of polyethylene polyamines (20-80% of the mixture being diethylene triamine and the remaining fraction being polyethylene polyamines having an average molecular weight within the range of 250-400) at a temperature of 200-225 DEG C. for a reaction time of 1-4 hours in a ratio of 0.4-0.5 equivalent of fatty acids for each equivalent of polyamines.  The lubricating oil may be mineral or synthetic or a mixture of both; synthetic oils mentioned are silicones, diesters, phosphates, polyethers and mixtures of these.  The fatty acids used in preparing the amino amides may comprise oleic, linoleic or linolenic acids, and also stearic acid (but not more than 50% of stearic acid) and may be derived from tallow or tall oil.  The mixture of polyethylene polyamines used in preparing the amino amides may comprise diethylene triamine, tetraethylene pentamine and higher homologues of the latter and may be obtained as the bottoms product in the process for the preparation of ethylene diamine by reacting ethylene dichloride with ammonia.  In preparing the grease, the clay may be dispersed in water to form a hydrogel and a strong mineral acid (e.g. phosphoric acid) added to activate the clay.  The waterproofing agent and the lubricating oil may then be added, and the water which separates may be removed.  The dehydrated composition may then be subjected to shearing to produce the grease.  In the examples, greases are prepared from mineral lubricating oil, hectorite clay (activated with phosphoric acid) and amino amides prepared by heating the mixture of polyethylene polyamines with various fatty acids.