METHOD FOR COMBINED PRODUCTION OF FLUORINE-CONTAINING PREPOLYMERS Russian patent published in 2013 - IPC C08G18/10 C08G18/73 C08G18/38 C08G18/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for combined production of fluorine-containing prepolymers of the following general formulae: in weight ratio of 90(1):3(II):7(III), respectively. Said method involves reaction of a hexamethylene diisocyanate trimer having content of isocyanate groups of 21.8±0.3% with 1,1,7-trihydroperfluoro-heptanol-1 in the presence of catalytic amounts of di-n-butyltin dilaurate in molar ratio of 1:1:0.005, respectively, in a medium of nitromethane and n-hexane in volume ratio of 1:6, at temperature of 90°C, ultrasound frequency 40 kHz for 2 hours.

EFFECT: combined production of fluorine-containing prepolymers using a method which is characterised by homogeneity of the solution of starting reagents, selectivity of formation of the prepolymers, avoiding the need to use auxiliary ingredients and additives, and fewer secondary processes.

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