Patent GB-950894-A (GB)
Title: Improvements in or relating to grease compositions
IPC: C10M169/00
Filed: 1961-08-04
Abstract: A process for making a grease composition comprises blending together under grease making conditions a major amount of a base oil and a minor amount of ingredients comprising a soap and from 1 to 15% by weight based on the weight of the soap of a carboxyalkylorganopolysiloxane having the average general formula: <FORM:0950894/C3/1> and from 0.01 to 5% based on the weight of the base oil of a polyvalent metal (tin, zinc or lead) compound, where in the formula m is an integer from 1 to 5, a is 0.001 to 1.0, b is 1.001 to 2, and the sum of a and b is 1.001 to 2.5, and R is selected from monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals, and a mixture of radicals consisting of at least one of these types together with up to 20 mol. per cent of cyanoalkyl radicals.  The polyvalent metal compound may be a salt of a straight or branched chain, saturated or unsaturated C8- 20 fatty acid, or an oxide or carbonate, examples being given; or an organometallic of tin or zinc with organic material having active replaceable hydrogen atoms; or a copolymer of the metal with sigano-siloxy units.  The soap may be an alkali metal soap of C8- 20 fatty acid, examples being given. The base oil may be a mineral oil; an organopolysiloxane oil of average general formula: <FORM:0950894/C3/2> where R11 is selected from monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals, and cyanoalkyl radicals, and d is 2.01 to 2.5; or a tin containing copolymer containing Si-C-Sn or Si-O-Sn linkages.  Optional additives referred to are diphenylamine, natural clay, carbon black, silica and metal oxides. Specifications 839,374, 847,335, 847,336, 864,681, 950,891, 950,892, U.S.A. Specifications 2,469,888, 2,469,890 and 2,731,417 are referred to.ALSO:A process for making a grease composition comprises blending together under grease-making conditions a major amount of a base oil and a minor amount of ingredients comprising a soap and from 1 to 15% by weight based on the weight of the soap of a carboxyalkylorganopolysiloxane having the average general formula <FORM:0950894/C3/1> and from 0.01 to 5% based on the weight of the base oil of a polyvalent metal, which is tin, zinc or lead, in the form of a compound thereof, where in the formula m is an integer from 1 to 5, a is 0.001 to 1.0, b is 1.001 to 2, and the sum of a and b is 1.001 to 2.5, and R is selected from monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals, and a mixture of radicals consisting of at least one of these types together with up to 20 mol. per cent of cyanoalkyl radicals.  The polyvalent metal compound may be a salt of a straight or branched chain saturated or unsaturated C8-20 fatty acid, or an oxide or carbonate, examples being given; or an organometallic or tin or zinc with organic material having active replaceable hydrogen atoms; or a copolymer of the metal with organo-siloxy units.  The soap may be an alkali metal soap of C8-20 fatty acid, examples being given.  The base oil may be a mineral oil; an organopolysiloxane oil of average general formula <FORM:0950894/C3/2> where R11 is selected from monovalent hydrocarbon radicals, halogenated monovalent hydrocarbon radicals, and cyanoalkyl radicals, and d is 2.01 to 2.5; or a tin containing copolymer containing Si-C-Sn or Si-O-Sn linkages. Optional additives referred to are diphenylamine, natural clay, carbon black, silica and metal oxides.  Specifications 839,374, 847,335, 847,336, 864,681, 950,891, 950,892 and U.S.A. Specifications 2,469,888, 2,469,890 and 2,731,417 are referred to.