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1. (WO2018226425) METHOD OF MAKING HALOSILOXANE
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That which is claimed is:

1 . A method of producing a halosiloxane, the method comprising:

combining water, a halosilane, and a first solvent, where the first solvent has a water solubility of > 1 .5 grams in 100 ml of solvent, to form a reaction mixture at a temperature above the melting point temperature of the solvent, partially hydrolyzing and condensing the halosilane to form a reaction product mixture comprising the halosiloxane, the solvent, a hydrogen halide and unreacted halosilane, and, optionally, adding a second solvent with a boiling point > the boiling point of the halosiloxane to the reaction mixture or the reaction product mixture.

2. A method according to claim 1 , wherein the halosilane is dichlormethylvinylsilane, trichlorovinylsilane, trichlorosilane, tetrachlorosilane or a mixture of trichlorosilane and tetrachlorosilane.

3. A method according to one or claims 1 or 2, wherein the halosiloxane is a halodisiloxane.

4. A method according to claim 3, wherein the halodisiloxane is 1 ,3-dichloro-1 ,3-dimethyl- 1 ,3-divinyldisiloxane, 1 ,1 ,3,3-tetrachloro-1 ,3-divinyldisiloxane, 1 ,1 ,3,3-tetrachlorodisiloxane, 1 ,1 ,1 ,3,3-pentachlorodisiloxane, or hexachlorodisiloxane.

5. A method according to claim 1 , wherein the partial hydrolysis and condensation is at a temperature from -30 °C to the reflux temperature of the halosilane.

6. A method according to any one of the preceding claims, wherein the reaction mixture is at a pressure from 0.1 kPa up to 150 kPa.

7. A method according to any one of the preceding claims, wherein the first solvent is a polar aprotic solvent comprising an ethereal solvent, a ketone, a nitrile, a formamide, an acetamide, a sulfoxide, an acetate, a phosphoramide, a pyrrolidinone, a nitroalkane, or a carbonate,.

8. A method according to claim 7, wherein the first solvent is tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether or poly(ethylene glycol) dimethyl ether .

9. A method according to any one of the preceding claims, wherein the second solvent is added the reaction mixture or the reaction product mixture.

10. A method according to any one of the preceding claims, further comprising recovering the halosiloxane from the reaction product mixture by distillation, vacuum stripping, evaporation, extraction or chromatography.

1 1 . A method according to any one of the preceding claims, wherein the mole ratio of water to halosilane combined to form the reaction mixture is from 4:1 to 1 :100.

12. A method according to any one of the preceding claims wherein the amount of solvent in the reaction mixture is up to 75 % (w/w), based on the weight of the solvent, the water, the halosilane, and the first solvent.

13. A method according to any one of the preceding claims wherein the reaction product mixture further comprises polymeric hydrolysis byproducts having three or more silicon atoms.

14. A method according to any one of the preceding claims, wherein the first solvent and the second solvent are the same.