Patent GB-612125-A (GB)
Title: Higher alkoxy silicon halides and materials treated therewith
IPC: C23C22/83
Filed: 1946-03-29
Abstract: Solid materials normally wetted by water, e.g. metals, rubber, glass and ceramic ware are rendered water-repellent by treatment with organo-silicon compounds of the general formula <FORM:0612125/III/1> wherein R represents the same or different hydrocarbon radicals, at least one of which is an alkyl radical containing 8 or more carbon atoms, R1 is a hydrocarbon or a hydrocarbonoxy radical, X is halogen, and n and n1 are whole numbers having a sum not greater than 3, n being from 1 to 3 and n1 from 0 to 2.  A number of compounds are specified (see Group IV).  They may be applied in a concentrated form or as a solution in an organic diluent, e.g. benzene, toluene, or carbon tetrachloride. In example 3, a magnesium alloy is treated with a solution of di-octyloxy-dodecyl silicon chloride in toluene.ALSO:Alkoxy silicon halides of the general formula <FORM:0612125/IV(a)/1> wherein each R represents a hydrocarbon radical and at least one R represents an alkyl radical containing 8 or more carbon atoms, R1 represents a hydrocarbon or a hydrocarbonoxy radical, X represents halogen and n and n1 are whole numbers having a sum not greater than 3, n being a number from 1 to 3 inclusive and n1 being a number from 0 to 2 inclusive, may be reacted with water to form silicols which intercondense to form viscous liquid or solid products.ALSO:Alkoxy silicon halides of the general formula <FORM:0612125/IV(b)/1> wherein each R represents a hydrocarbon radical and at least one R represents an alkyl radical containing 8 or more carbon atoms, R1 represents a hydrocarbon or a hydrocarbonoxy radical, X represents halogen and n and n1 are whole numbers having a sum not greater than 3, n being a number from 1 to 3 inclusive and n1 being a number from 0 to 2 inclusive, are prepared by reacting from one to three molecular proportions of the same or different aliphatic alcohols at least one of which contains at least 8 carbon atoms with a polyhalo silicon compound of the general formula R1n1SiX4-n1, where R1, n1 and X have the above significance.  The reaction may be effected in an inert solvent, e.g. petroleum ether, ligroin, benzene or ethylene dichloride, and it may be necessary to cool the reaction mixture.  Suitable alcohols are primary and secondary octyl alcohols, primary and secondary nonyl alcohols, decyl, dodecyl, tetradecyl, cetyl, canoubyl, ceryl, myricyl and tarchonyl alcohols.  Suitable polyhalo silicon compounds are: silicon tetrachloride, silicon tetrabromide, silicon tetrafluoride, methyl silicon trichloride, methyl silicon trifluoride, ethyl silicon tribromide, butyl silicon trichloride, octyl silicon trichloride, di-octyl silicon dichloride, dodecyl silicon trichloride, di-dodecyl silicon dichloride, phenyl silicon trichloride, diethoxy silicon dichloride, tolyloxy silicon trichloride and diphenoxy silicon dichloride.  The products of the invention may be reacted with water to form silicols which intercondense to form viscous liquid or solid products.  In an example the preparation of the following compounds is described: tri-octyloxy silicon chloride, dodecyl-di-iso-octyloxy silicon chloride, dodecoxy-silicon trichloride, di-dodecoxy silicon dichloride, tri-dodecoxy silicon chloride, dodecoxy-di-phenyl silicon chloride, di-dodecoxy-isoamyl silicon chloride, di-octa-decoxy-propoxy silicon chloride, octadecoxy-dodecoxy-propoxy silicon chloride, tri-myricyloxy silicon chloride, tri-dodecyloxy silicon bromide and di-octyloxy silicon di-fluoride.