Dow Corning Corporation

Thomas Easton

Bryan Thomas

Peter Cheshire Hupfield

Gary Michael Wieber

Yihan Liu

Thomas Bekemeier

Derek William Butler

Thomas Daniel Bekemeier

A process for preparing an aqueous dispersion of a silicone resin is disclosed by reacting a mixture containing an alkylalkoxysilane and a cationic alkoxysilane to form a self dispersing silicone resin and subsequently combining the silicone resin with water to form the dispersion. The resulting dispersions are useful for forming coatings on various substrates that are essentially free of co-surfactants or volatile organic solvents.

Water-dispersible silicone resins

A curable composition comprises a polysiloxane additive having at least one unit R.sub.a SiO.sub.(4-a)/2 and at least one unit R.sub.b R.sup.1 SiO.sub.(3-b)/2 wherein R is a C.sub.1-12 hydrocarbon, R.sup.1 is --(CH.sub.2).sub.n (OR.sup.2).sub.m X where R.sup.2 is C.sub.2-3 alkylene, a is 0, 1, 2 or 3 and b is 0, 1 or 2, and X is OH or --OCOCR.sup.3 .dbd.CH.sub.2 where R.sup.3 is H, methyl or ethyl, n is 2 to 5 and m is 8 to 50, provided where X is OH, n is 3 and m is 18. The compositions are useful with polyacrylates as overprint varnishes with improved stability of friction coefficients. Also disclosed is a method for making the additives.

Curable compositions

The specification describes and claims a method for the de-emulsification of emulsions of water and crude oil which comprises treating the emulsion with an organosiloxane, a siloxane unit having a quaternary ammonium group R'N.sup.+ (R.sup.2).sub.3 X.sup.- linked to its silicon atom, R' represents a divalent hydrocarbon group linking the silicon and nitrogen atoms, each R.sup.2 represents an alkyl group having up to 20 carbon atoms or a polyoxyalkylene chain having 3 to 50 oxyalkylene groups, and X.sup.- represents a halogen ion. Examples of organosiloxanes given include those composed exclusively of the said units, and copolymers composed of these siloxane units and siloxane units according to the general formula R.sub.b (SiO.sub.4-b)/2 in which each R is a substituted or unsubstituted hydrocarbon group of up to 10 carbon atoms, and b has the value 0. 1, 2 or 3, for example those according to the average general formula

De-emulsification of oils

A method of de-hazing distillate fuel is disclosed which comprises adding to the fuel a solution of a halide salt dissolved in an alcohol, and an alcohol soluble organosiloxane. The halide salt may be the chloride of magnesium, cadmium, copper, nickel or the tetra methyl ammonium group, for example the salt may have the formula MgCl.sub.2.6H.sub.2 O or (CH.sub.3).sub.4 NCl. The organosiloxane may be a cyclic, linear or branched material and may have e.g. a minor amount of siloxane units having the general formula ##EQU1## and a minor amount of siloxane units having the general formula ##EQU2## in which each R represents a substituted or unsubstituted hydrocarbon group of up to ten carbon atoms, a has the value 0, 1, 2, or 3, b has the value 0, 1 or 2, c has the value 1 or 2, and each Z represents a group linked to the silicon atom and comprising a functional organic group. Each group Z may be a group selected from the polyoxyalkylene group R'(OCH.sub.2 CH.sub.2).sub.p (OCH.sub.2 CH.CH.sub.3).sub.r OR', the amine group R'NHQ, the quaternary ammonium salt R'NR.sub.3.sup.2 X, the carboxylate group R'CO.sub.2 M, the sulphonate group R'SO.sub.3 M, or the hydroxyl group, in which R' represents a group which provides a link to the silicon atom through an oxygen or a carbon atom, p has a value in the range 1 to 100, r has a value in the range 0 to 50, the sum of p and q is in the range 2 to 100, R' represents a hydrogen atom, an alkyl group or an acyl group, Q represents a hydrogen atom or a group R'NHQ, each R.sup.2 represents an alkyl group, X represents a halide ion and each group M represents a cation.

Removal of water haze from distillate fuel

The specification discloses a method of de-hazing distillate fuel which comprises adding to the fuel an organosiloxane having at least one quaternary ammonium substituted siloxane unit having the general formula

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Barry, United Kingdom

Thomas Easton