METHOD OF PRODUCING ORGANOFLUOROSILOXANE COPOLYMERS Russian patent published in 2012 - IPC C08G77/06 C08G77/24 

FIELD: chemistry.

SUBSTANCE: invention relates to the technique of producing fluorine-containing polyorganosiloxane polymers. Disclosed is a method of producing organofluorosiloxane copolymers of general formula R¹R²R³SiO{[Si(CH₃)₂O]_p[Si(CH₃)(CH₂CH₂CF₃)O]_q}_kSiR¹R²R³ (where R¹, R²-methyl or phenyl, R³-methyl or vinyl; p=0.05-0.95; q=1-p, k=10-2000) through copolymerisation of α,ω-dihydroxyoligodimethyl siloxane with average composition corresponding to formula HO[Si(CH₃)₂O]_nH, where n=6-100, c 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane and triorganosilane of formula R¹R²R³SiOH, where R¹, R², R³ assume values given above, while heating to 70-110°C in the presence of an alkaline catalyst in amount of 0.001-0.5 wt % of the mixture of reagents. The synthesised polymers are used in production of heat-, frost- and fuel-resistant rubber, compounds, sealants, lubricants, hydraulic fluids and anti-adhesion compositions.

EFFECT: disclosed method provides high output of fluorosiloxane copolymers with different composition and controlled viscosity with low content of secondary organocyclosiloxanes.

1 cl, 5 ex