Wacker-chemie Gmbh

Rudolf Heinrich

Wolfgang Hechtl

Norman Dorsch

Oswin Sommer

Stefan Oberneder

The invention relates to a method for producing organopolysiloxane terminated with alkoxy groups, wherein A) organopolysiloxane terminated with HO is reacted with B) alkoxysilane having at least three alkoxy groups and/or whose partial hydrolysate is made to react in the presence of C) acid phosphoric acid ester of general formula (I): (HO) OP(&mdash;O&mdash;&lsqb;(CR ) &mdash;O&rsqb; &lsqb;(CR ) &rsqb; &mdash;L&mdash;M) , wherein a&equals;1 or 2; R and R &equals;a hydrogen, methyl or hydroxyl radical; b and d&equals;2 or 3; c&equals;integral values from 2 to 15; e&equals;0 or 1; L&equals;a radical from the group &mdash;O&mdash;, &mdash;COO&mdash;, &mdash;OOC&mdash;, &mdash;CONR &mdash;, &mdash;NR CO&mdash; and &mdash;CO&mdash;; R and R &equals;a hydrogen or a C -C -alkyl radical and M&equals;a monovalent, optionally a hydroxyl, fluorine, chlorine, bromine, C -C -alkoxylalkyl or cyano group substituted C - to C -hydrocarbon radical, provided that the radicals R and R can only be at one given time a hydroxyl radical in each hydrocarbon atom. The invention further relates to RTV-1-alkoxy masses comprising the reaction product containing organopolysiloxane terminated with alkoxy groups as the essential constituent.

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Emmerting, Germany

Rudolf Heinrich