METHOD FOR PRODUCING OLIGOORGANOSILOXANES WITH VARIOUS STRUCTURES Russian patent published in 2022 - IPC C08G77/06 C08G77/08 C08G77/16 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of synthesising oligoorganosiloxanes with a branched, monocyclic, and spirocyclic structure. Proposed is method for producing oligoorganosiloxanes corresponding to the structural formula (I), wherein R¹=CH₃; R²=C₆H₅; n=0-4, with both linear (n=0) and cyclic (n=1) and spirocyclic (n=2÷4) structures, in the process of acid hydrolysis copolycondensation jointly with a hydrolytic mixture of diorganodialkoxysilane of the general formula R¹R²Si(OR³)₂, wherein R³=CH₃, C₂H₅, with tetraalkoxysilane of the general formula Si(OR)₄, wherein R=R³, adding demineralised water and acetic acid to the reaction mixture at the molar ratio of the above components of 2(n+1):(n+1):(n+1):(3n+5), respectively, wherein the volatile reaction products undergo distillation at a temperature of 90°C or less.

EFFECT: reaction temperature is reduced by 2.3 times, consumption of organic acid is lowered, output of the end product is increased, and time of the production process is reduced.

(I)

1 cl, 5 ex