SUPPORTING DEMPENING LIQUIDS FOR FLOAT-TYPE DEVICES BASED ON SYNTHETIC PERFLUORPOLYETHERS WITH IMPROVED OPERATING CHARACTERISTICS Russian patent published in 2009 - IPC C08L27/12 G01C19/14 

FIELD: chemistry.

SUBSTANCE: dampening liquid for float-type devices represents oligomer fractions of perfluorpolyethers, boiling away at temperature higher than 130°C, isolated by distillation under vacuum from mixture of synthetic perfluorpolyethers, boiling away at temperature higher than 70°C, or mixture in various combinations of fractions of oligomers of synthetic perfluorpolyethers, selected from group including perfluorpolyethers oligomer fractions boiling away at temperature from 130°C and higher with kinematic viscosity at 20°C 56-150 mm²/s, perfluorpolyethers oligomer fractions boiling away at temperature from 240°C and higher with kinematic viscosity 500-620 mm²/s at 20°C, perfluorpolyethers oligomer fractions boiling away at temperature 320°C and higher with kinematic viscosity 700-730 mm²/s.

EFFECT: obtaining novel viscous device liquids with lower vapour resiliency, with improved viscosity and low-temperature characteristics and high chemical, thermal and radiation stability.

1 cl, 6 ex