METHOD OF PRODUCING FUNCTIONAL POLYORGANOSILOXANES AND COMPOSITION BASED THEREON Russian patent published in 2011 - IPC C08G77/06 C08G77/04 C08G77/18 C08L83/05 C08L83/07 

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing functional polyorganosiloxanes through polycondensation of organoalkoxysilanes in an active medium which is an anhydrous carboxylic acid or mixture thereof with an organic solvent, where said organoalkoxysilanes are selected from R'CH₃Si(OR)₂; R"Si(OR)₃; R"₂Si(OR)₂ and R'_n(CH₃)_3-nSiOR, where R denotes CH₃ or C₂H₅; R' - CH₂=CH- or H; R" - C₆H₅ or CH₂=CH- or CH₃; n equal 0 and/or 1; where the starting organoalkoxysilanes are selected in a way which enables to obtain in one production cycle functional polyorganosiloxanes of given structures from: (A) - containing an average of at least two vinyl groups for each macromolecule; (B) containing an average of at least two hydride silyl groups for each macromolecule. Disclosed also is a curable composition based on functional polyorganosiloxanes obtained using the disclosed method.

EFFECT: method enables to obtain polyorganosiloxanes with reproducible composition and molecular weight and the obtained composition can be used to encapsulate light-emitting devices.

21 cl, 5 dwg, 6 ex