Patent GB-783679-A (GB)
Title: Improvements in or relating to resinous condensation products of basic aluminium salts of organic acids
IPC: C08G79/10
Filed: 1956-02-06
Abstract: Grease compositions contain polymeric basic aluminium salts of organic acids of the formula <FORM:0783679/III/1> in which n is a whole number and X and X1 stand for the same or different organic acid radicals.  In examples, grease compositions are described consisting of mineral oil, polymeric aluminium stearate and stearic acid.ALSO:Polymeric basic aluminium salts of organic acids of the formula <FORM:0783679/IV (a)/1> in which X and X1 stand for the same or different organic acid radicals and n is a whole number, are prepared by reacting basic aluminium salts of the formula (HO)2Al-X with dialkoxy aluminium salts (RO)2AL-X1, where R stands for an alkyl radical.  The basic aluminium salts may be prepared by reacting the dialkoxy aluminium salts with water.  The reaction is preferably carried out in an inert solvent (e.g. dry xylene, mineral spirits or aromatic white spirits) and at an elevated temperature (e.g. 100-150 DEG  C.).  Organic acids specified are palmitic, stearic, oleic, nonanic, benzoic, naphthenic, rosin, and mixtures thereof (e.g. tall oil).  Alkyl radicals disclosed are ethyl, propyl, isopropyl, butyl, secondary butyl, and amyl. The products are soluble in hydrocarbons (e.g. benzene, toluene and xylene), petroleum ether or white spirit, and may be used for lacquers or paints or (e.g. when mixed with stearic acid and mineral or spindle oil) greases.  Four main types of reaction are disclosed in examples.  (A) In Example 1 oleic acid is dissolved in dry aromatic white spirits, heated to 85 DEG  C. and added to a similar solution of aluminium isopropoxide.  The mixture is stirred for 1 hour at 95 DEG  C. and powdered aluminium dihydroxyoleate is added.  The reactants are stirred for 3 hours at 95 DEG  C., heated to 140 DEG  C., and refluxed for 1 hour, finally in vacuo, to remove solvent.  Examples 3, 9, and 12 are similar except that they all use dry xylene and aluminium dihydroxy stearate and (3) uses stearic acid and aluminium secondary butoxide, (9) uses naphthenic acid of acid number 158.7 and (12) uses nonanic acid.  (B) In Example 2 stearic acid is dissolved in dry xylene, heated to 85 DEG  C. and added to a similar solution of aluminium isopropoxide. The mixture is stirred for 1 hour at 95 DEG  C.  Water and isopropanol are added to half of this solution which is then stirred for 1 hour at 95 DEG  C. and added to the other half. The reaction proceeds as in Example 1.  Examples 7 and 10 are similar except that (7) uses naphthenic acid of acid number 158.7 and (10) uses benzoic acid.  (C) Example 4 is like Example 2 except that the solution is not split into two portions.  Examples 5, 6 and 8 are similar except that (5) uses oleic acid; (6) uses mineral oil on a naphthene basis and (8) uses distilled tall oil (30 per cent rosin acids) of acid number 181.  (D) For Example 11 diisopropoxy and dihydroxy aluminium stearate are dry ground and heated in vacuo to 195 DEG  C. over 4 hours, and maintained at that temperature for one hour.  The polymeric aluminium stearate of Example 2 is heated with an equal weight of stearic acid in a large excess of spindle oil to form a grease.  The polymeric product of Example 6 may be similarly compounded.