Process for preparing acyloxysiloxanes

Details Process for preparing acyloxysiloxanes Process for preparing acyloxysiloxanes

C - Chemistry, Metallurgy

07

F

260/442.7

C07F 7/18 (2006.01)

Patent

CA 1133499

ABSTRACT OF THE DISCLOSURE An improved process is provided for preparing acyloxysiloxanes. The acyloxysiloxanes are prepared by conducting an aliphatic carboxylic acid in vapour form upwards from the bottom of a column countercurrent to the flow of chlorosilane, in which the carboxylic acid is introduced into the column at such a rate that the carboxylic acid does not exceed 1.3 mol per gram of Si-bonded chlorine in the column, while introducing up to 10 percent by weight of water based on the weight of the carboxylic acid into the column and removing the acyloxysiloxane from the bottom of the column. The process is carried out in the absence of iron or iron complexing agents, is conducted in the absence of solvents, with very short reaction times with excellent yields of acyloxysiloxanes. These products may be mixed with diorganopolysiloxanes to prepare compositions storable under anhydrous conditions but which cure upon exposure to water to elastomeric solids.

385475

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