METHOD OF PRODUCING LOW-MOLECULAR FLUORO-ORGANOSILOXANE POLYMERS Russian patent published in 2012 - IPC C08G77/06 C08G77/24 C08G77/20 

FIELD: chemistry.

SUBSTANCE: invention discloses a method of producing organosilicon fluorine-containing polymers of formula (I), where R¹ denotes CH₃, CH=CH₂, CH₂CH₂CF₃; p=3-500, q=2-40, through reaction of a mixture of organocyclotrisiloxane of formula [Si(CH₃)(CH₂CH₂CF₃)O]₃ and organosiloxane diols of general formula HO[Si(CH₃)R¹O]_qH, where R¹ assumes values given above, q is on average 2-40, at temperature from 30 to 60°C under the effect of a catalyst - sodium or potassium silanolate or siloxanolate, taken in amount of 5·10^-4-1·10^-1 wt % of the weight of the mixture of reagents in terms of sodium or potassium hydroxide, in the presence of a promoter - oligoethylene glycol ether in amount of up to 0.1 wt % of the weight of the mixture of reagents. HO[Si(CH₃)(CH₂CH₂CF₃)O]_p[Si(CH₃)R¹O]_qH (I).

EFFECT: obtained polyorganosiloxanes have controlled and reproducible molecular weight and high output with low content of undesirable organocyclosiloxanes.

1 cl, 6 ex