Wacker-Chemie Gmbh

Konrad Sallersbeck

Bernward Deubzer

Erich Brunner

Jurgen Burkhardt

Herman Wilhelm

Hydrophilic, crosslinked organopolysiloxanes are obtained from the polymerization of hydroxyalkylmethacrylate and/or hydroxalkylacrylate in the presence of an organopolysiloxane containing at least 40 mol percent of monoorganosiloxane units. These hydrophilic, crosslinked, modified organopolysiloxanes are prepared by polymerizing hydroxyalkylmethacrylate and/or hydroxyalkylacrylate in the presence of free radical initiators and an organopolysiloxane containing at least 40 mol percent of monoorganosiloxane units which can be crosslinked or has been crosslinked by the condensation reaction in the presence of a condensation catalyst, the amount and type of condensation catalyst and/or catalytic system, including the inhibitor for the polymerization of the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate, is selected so that the crosslinking of the organopolysiloxane which is substantially uniformly distributed in the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate is initiated and preferably completed before the polymerization of the hydroxyalkylmethacrylate and/or hydroxyalkylacrylate is completed.

Hydrophilic, crosslinked, modified organopolysiloxanes and process for

A process for preparing plastic wood which comprises impregnating wood with a mixture containing (1) an organopolysiloxane having groups which are capable of condensation and/or containing SiC-bonded alkenyl group having an average molecular weight of at least 500 when the organopolysiloxane contains from 0.5 to 1.89 SiC-bonded organic radicals for each silicon atom and when the organopolysiloxane (1) contains from 1.90 to 2 SiC-bonded organic radicals for each silicon atom, then the average molecular weight is at least 20,000 and (2) an organic silicon compound having at least three groups which are capable of condensation and/or atoms capable of condensation and a maximum of 10 silicon atoms per molecule; and other substances if desired; and thereafter crosslinking the organopolysiloxane (1) having groups capable of condensation and/or containing SiC-bonded alkenyl groups, which is present in the wood.

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Burghausen, Germany

Konrad Sallersbeck