The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2011
Filed:
Oct. 30, 2007
Eberhard Esselborn, Essen, DE;
Ralf Schnelle, Donaueschingen, DE;
Roland Sucker, Werne, DE;
Otto Klocker, Essen, DE;
Eberhard Esselborn, Essen, DE;
Ralf Schnelle, Donaueschingen, DE;
Roland Sucker, Werne, DE;
Otto Klocker, Essen, DE;
Evonik Goldschmidt GmbH, , DE;
Abstract
The invention relates to the polyoxyalkylene-polysiloxane block polymers of general formula (I) C—B—(AB)—C(I), wherein A=a polyoxyalkylene block of the general formula —(CHO)—, B=a polysiloxane block of the general formula —(SiR—O)—, C, C=the same or different alkoxypolyoxyalkylene groups of the general formula Z—O—[CH—CH(R)O]—, 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 <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.