METHOD OF PRODUCING FLUORINE-CONTAINING PREPOLYMER HAVING ISOCYANATE GROUPS Russian patent published in 2013 - IPC C08G18/10 C08G18/73 C08G18/34 C08G18/38 C08G18/24 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a fluorine-containing prepolymer having isocyanate groups of general formula: , which can be used as a modifier of carbo- and hetero-chain polymers, to produce materials having high hydrolytic and thermal stability. Said method involves reaction of a hexamethylene diisocyanate trimer having content of isocyanate groups of 21.8±0.3% with trifluoroacetic acid in the presence of catalytic amounts of di-n-butyltin dilaurate in molar ratio of 1:1:0.003, respectively, in a medium of o-dichlorobenzene at temperature of 70°C, ultrasound frequency 40 kHz for 2 hours.

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

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