Patent GB-638605-A (GB)
Title: Improvements in and relating to lubricating oils
Filed: 1948-01-15
Abstract: A lubricating oil comprises a liquid polymeric organo-substituted polysiloxane and a small amount of a mixture of ingredients comprising (1) a chlorinated aliphatic or cycloaliphatic hydrocarbon or a chlorinated saturated aliphatic monohydric alcohol ester of a saturated aliphatic fatty acid having from 2 to 5 carbon atoms, and (2) an alkyl thioglycollate having from 2 to 8 carbon atoms in the alkyl group.  The liquid polymeric organo-substituted polysiloxane preferably contains an average of 1.9 to 2.67 hydrocarbon groups per silicon atom and the hydrocarbon groups may be alkyl groups for example ethyl, propyl, butyl and iso-propyl, aryl groups such as phenyl, or different hydrocarbon groups may be substituted on the same silicon atom or similar groups on different silicon atoms.  The polysiloxane may also contain chlorine atoms substituted on the organic radical. Chlorinated aliphatic hydrocarbons which may be used include 1 : 1 : 2-trichloroethane, hexachloroethane, acetylene tetrachloride, 1 : 2-dichloropentane, dichloro tertiary butyl chloride, tertiary amyl chloride, pentachlorpropane, chlorinated cyclohexanes and cycloheptanes and chlorinated methyl cyclohexanes. Examples given of chlorinated saturated aliphatic monohydric alcohol esters of saturated aliphatic fatty acids having from 2 to 5 carbon atoms, include monochloroethyl trichloroacetate, dichloropropyl monochloroacetate, ethyl monochloroacetate, butyl dichloroacetate and propyl 3,3,3 trichlorobutyrate; esters in which the acid radicle is unchlorinated include 2,2-dichloroethyl acetate, 2-chloropropyl butyrate and 3,4,4,4-tetrachlorobutyl butyrate.  The alkyl thioglycollate may be ethyl, propyl, butyl or hexyl thioglycollate, 2-ethylbutyl thioglycollate or 2-ethylhexyl thioglycollate.  From 30 to 70 per cent by weight of each of the chlorinated compound and the thioglycollic acid ester in a mixture of the two may be used, the mixture preferably comprising not more than 15 per cent by weight of the polysiloxane.  Specifications 586,189, 586,956, [both in Group IV], and 630,911, [Group IV (a)], are referred to.ALSO:A lubricating oil comprises a liquid polymeric organo-substituted polysiloxane and a small amount of a mixture of ingredients comprising (1) a chlorinated aliphatic or cyclo-aliphatic hydrocarbon or a chlorinated saturated aliphatic monohydric alcohol ester of a saturated aliphatic fatty acid having from 2-5 carbon atoms, and (2) an alkyl thioglycollate containing from 2-8 carbon atoms in the alkyl group. The liquid polymeric organo-substituted polysiloxane preferably contains an average of 1.9 to 2.67 hydrocarbon groups per silicon atom and the hydrocarbon groups may be alkyl groups, for example methyl ethyl, propyl, butyl and isopropyl, aryl groups, for example phenyl, diphenyl, naphthyl and anthracyl, aralkyl radicals, for example benzyl and phenylethyl; alkaryl radicals, for example tolyl and xylyl, alicyclic radicals, for example cyclopentyl and cyclohexyl or heterocyclic radicals.  Different hydrocarbon groups may be substituted on the same silicon atom or similar groups on different silicon atoms.  The polysiloxane may also contain chlorine atoms substituted on the organic radical.  Chlorinated aliphatic hydrocarbons which may be used include 1.1.2-trichloroethane, hexachloroethane, acetylene tetrachloride, 1.2-dichloropentane, dichloro tertiary butyl chloride, tertiary amyl chloride, pentachloropropane, chlorinated cyclohexanes and cycloheptanes and chlorinated methyl cyclohexanes.  Examples given of chlorinated saturated aliphatic monohydric alcohol esters of chlorinated saturated aliphatic fatty acids having from 2-5 carbon atoms include monochloroethyl trichloroacetate, dichloropropyl monochloroacetate, ethyl monochloroacetate, butyl dichloroacetate and propyl 3.3.3-trichlorobutyrate; esters in which the acid radicles are unchlorinated include 2.2-dichloroethyl acetate, 2-chloropropyl butyrate and 3.4.4.4-tetrachlorobutyl butyrate.  The alkyl thioglycollate may be ethyl, propyl, butyl or hexyl thioglycollate, 2-ethylbutyl thioglycollate and 2-ethyl-hexyl thioglycollate.  From 30 to 70 per cent by weight of each of the chlorinated compound and the thioglycollic acid ester in a mixture of the two may be used, the mixture preferably comprising not more than 15 per cent by weight of the polysiloxane.  Specifications 586,189, 586,956 and 630,911 are referred to.