Wacker-chemie Gmbh

David Heuttner

Christian Herzig

Bernward Deubzer

Reinhard Stallbauer

Robert Banfic

The invention relates to novel polymeric organosilicon compounds comprising hydrocarbon radicals with at least one aliphatic carbon-carbon double bond in a terminal position. To produce these compounds, (A) compounds containing at least one aliphatic carbon-carbon double bond per molecule, in a terminal position, are reacted with (B) oligomeric or polymeric organosilicon compounds containing units of the general formula R,R,SiO,and units of the general formula HRSiO and/or HSiO,and possibly units of the general formula R,SiO, where R is a monovalent, possibly substituted, hydrocarbon radical with between 1 and 18 carbon atoms per radical, which is free of aliphatic carbon-carbon double bonds, and R,is a monovalent hydrocarbon radical with between 1 and 18 carbon atoms per radical which has at least one aliphatic carbon-carbon double bond in a terminal position, subject to the condition that the sum of the units HRSiO and R,R,SiO,on average is greater than 2.0 if (B) contains no HSiO,units, and the number of R,radicals per molecule is greater than the number of Si-bonded hydrogen atoms, in the presence of (C) catalysts promoting the addition of Si-bonded hydrogen to aliphatic double-bonds. The ratio of aliphatic double bonds in components (A) and (B) to Si-bonded hydrogen in component (B) is between 1.5 and 10, subject to the condition that the polymeric organosilicon compounds on average contain more than two hydrocarbon radicals with at least one aliphatic carbon-carbon double bond in a terminal position.

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Tecumseh, MI, United States of America

David Heuttner