General Electric Company

Louis P Petersen

John S Razzano

Bruce A Ashby

Acyloxysilanes are prepared by reacting a chlorosilane with an aliphatic carboxylic acid in a column at an elevated temperature and preferably at a pressure of about 760 mm Hg. wherein the aliphatic carboxylic acid in the vapor phase passes upward from the bottom of the column countercurrent to the flow of the chlorosilane passing downward in the column. The improvement comprises introducing the carboxylic acid into the column at such a rate that the carboxylic acid exceeds 1.3 moles per gram atom of silicon-bonded chlorine in the column and removing low boiling reaction by-products from the top of the column while collecting the acyloxysilane product dissolved in the aliphatic carboxylic acid at the bottom of the column. In a preferred embodiment, methyltriacetoxysilane is prepared by reacting methyltrichlorosilane with acetic acid in a heated fractionation column.

Continuous process for preparing acyloxysilanes

A process for the continuous manufacture of diorganopolysiloxane polymers. The polymerization reaction takes place in a static mixer wherein dimethyl cyclic polysiloxane monomers are treated with a potassium silanolate catalyst. Efficiency of the static mixer is maintained by the early introduction of water chain-stopper which effectively provides for a plug flow condition within the polymerizer section. Preparation of other polysiloxane fluids utilizing triorganosiloxy chainstopper is also disclosed.

Process for the continuous manufacture of siloxane polymers

A silyl phosphate which is an improved neutralizing agent for alkali metal hydroxides in silicone reactions, comprising the reaction product of a linear siloxane, and a phosphorous oxyhalogen or phosphoric acid. The reaction products of the phosphorous oxyhalogen over phosphoric acid are preferred. Such a reaction product is preferred for the continuous neutralization of alkali metal hydroxides in the equilibration of siloxanes.

Silyl phosphates as neutralizing agents for alkali metal hydroxides

An improved process for producing silyl phosphates in the reaction of phosphoric acid with the linear low molecular weight polysiloxane alone or in combination with cyclicpolysiloxanes where there is present in the composition as a catalyst from 1.2 to 180% by weight of the total composition of a silylphosphate in which the phosphoric acid equivalency in the reaction mixture is from 0.36 to 1.80%.

Growing community of inventors

Latham, NY, United States of America

Louis P Petersen