Evonik Goldschmidt Corporation

Ralf Schnelle

Eberhard Esselborn

Roland Sucker

Otto Klocker

The invention relates to the polyoxyalkylene-polysiloxane block polymers of general formula (I) C&#x2014;B&#x2014;(AB)&#x2014;C(I), wherein A=a polyoxyalkylene block of the general formula &#x2014;(CHO)&#x2014;, B=a polysiloxane block of the general formula &#x2014;(SiR&#x2014;O)&#x2014;, C, C=the same or different alkoxypolyoxyalkylene groups of the general formula Z&#x2014;O&#x2014;[CH&#x2014;CH(R)O]&#x2014;, R=the same or different Calkyl groups or phenyl groups, with the proviso that at least 90% of the groups R are methyl groups, R=the same or different hydrogen, Calkyl groups or phenyl groups, Z=an alkyl, alkylene, aryl or alkylaryl group, a=1 to 20, preferably 2 to 10, b=an average value of 10 to 130, preferably 20 to 100, c=3 to 100, preferably 10 to 80, d=independently is in the range of C/Cvalues of 2 to 20, preferably 2 to 12, with the proviso that the average value is in the range of 2 to &#x3c;15, preferably 2 to 12, especially 5 to 10, and d is preferably unequal b, n=2 to 12 having an average value of 2.7 to 4.0. The invention also relates to a method for producing said block polymers and to their use in antifoaming agents in aqueous dispersions.

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Donaueschingen, Germany

Ralf Schnelle