An organopolysiloxane containing units of given formula useful as joint sealing compositions, e.g. for buildings, land-, water-, and aircraft, as adhesives, and insulation of electrical and electronic devices

摘要

An organopolysiloxane containing units of given formula as defined below is new. An organopolysiloxane containing at least one unit of formula (I): at least one unit of formula (II), and at least one unit of formula (III) is new: R = monovalent optionally substituted hydrocarbon, R', R3,R4, R7, R8 and R9 = as for R, R1 and R10 = H or as for R, R2 = -C(=O)-NH-R3 or -C(=O)(OR4), R5 = H or structure (IIIa), X = -C(=O)-R8, N=CR92 or as for R, R6 = divalent optionally substituted hydrocarbon, a = 1, 2, or 3, y = 0 or 1. Independent claims are included for: (1) a method of preparing the organopolysiloxanes where in a first step an OH-terminated organopolysiloxane is reacted with silanes of formula (V): and or their partial hydrolysates:R and R1 - as above, R11 = as for R, and the amino groups of the reaction product from the first step are reacted (sic) with compounds selected from:isocyanates, reactive isocyanate derivatives and reactive carboxylic acid derivatives and converted to urea- or carbamate groups, and optionally in a third step the organopolysiloxane obtained in the second step is end blocked with silanes of formula (VI): X and R7 = as above and a' = 2, 3, or 4; (2) compositions crosslinkable by a condensation reaction, containing organopolysiloxane as above; (3) mold parts obtained by crosslinking of the above compositions.