Patent GB-1074575-A (GB)
Title: Aqueous lubricants containing siloxane-polyoxyalkylene copolymers
IPC: C08G77/00
Filed: 1963-09-24
Abstract: A lubricant composition comprises (A) a base fluid of water or mixture of (a) water and (b) from 10-200 parts by weight (per 100 parts by weight of water in the mixture) of an organic lubricant of (1) a silicon-free polyoxyalkylene compound, (2) a dialkyl ester of an aliphatic dicarboxylic acid, (3) a hydrocarbon lubricating oil, or (4) an ester of a polyhydric alcohol and a fatty acid; and (B) a copolymer comprising (a) at least one siloxane block comprising at least two siloxane units represented by the formula <FORM:1074575/C4-C5/1> wherein R is a unsubstituted monovalent hydrocarbon radical, a substituted monovalent hydrocarbon radical containing halogen, cyano, amido, carbalkoxy, acyloxy, mercapto or nitro groups as substituents or divalent hydrocarbon radical, and b is 1, 2 or 3, said siloxane block having at least one divalent hydrocarbon radical represented by R, and (b) at least one polyoxyalkylene block comprising at least two oxyalkylene units that are represented by the formula [-R1O-], wherein R1 is an alkylene radical, each such siloxane block having a ratio of hydrocarbon radicals to silicon atoms of from 1:1 to 3:1, each such siloxane block being linked to each such polyoxyalkylene block via an Si-C bond by a divalent hydrocarbon radical represented by R, said copolymer containing from 5 to 95 parts by weight of siloxane blocks and from 5 to 95 parts by weight of oxyalkylene blocks per 100 parts by weight of the copolymer, and said copolymer being present in the composition in an amount from 0.2 to 10 parts by weight per 100 parts by weight of the base fluid. Many optional ingredients are specified.ALSO:A lubricant composition comprises (A) a base field of water, a mixture of (a) water and (b) from 10-200 parts by weight (per 100 parts by weight of water in the mixture) of an organic lubricant of: (1) a silicon-free polyoxyalkylene compound; (2) a dialkyl ester of an aliphatic dicarboxylic acid; (3) a hydrocarbon lubricating oil; or (4) an ester of a polyhydric alcohol and a fatty acid; and (B) a copolymer comprising (a) at least one siloxane block comprising at least two siloxane units represented by the formula <FORM:1074575/C3/1> , wherein R is an unsubstituted monovalent hydrocarbon radical, a substituted monovalent hydrocarbon radical containing halogen, cyano, amido, carbalkoxy, acyloxy, mercapto or nitro groups as substituents, or a divalent hydrocarbon radical; and b is 1, 2 or 3, said siloxane block having at least one divalent hydrocarbon radical represented by R; and (b) at least one polyoxyalkylene block comprising at least two oxyalkylene units that are represented by the formula [-R1O-] wherein R1 is an alkylene radical, each such siloxane block having a ratio of hydrocarbon radicals to silicon atoms of from 1:1 to 3:1, each such siloxane block being linked to each such polyoxyalkylene block via an Si-C bond by a divalent hydrocarbon radical represented by R, said copolymer containing from 5 to 95 parts by weight of siloxane blocks and from 5 to 95 parts by weight of oxyalkylene blocks per 100 parts by weight of the copolymer, and said copolymer being present in the composition in an amount from 0.2 to 10 parts by weight per 100 parts by weight of the base fluid.