Th. Goldschmidt Ag

Evonik Goldschmidt Corporation

Otto Klocker

Hans-Ferdi Fink

Roland Sucker

Eberhard Esselborn

Roland Berger

Christian Weitemeyer

Stefan Silber

Jurgen Fock

Gerd Rossmy

Michael Keup

Eckehard Schamberg

Wernfried Heilen

Hans-Leo Karminski

Roland Spiegler

Koerner, Gotz

Ralf Schnelle

Gert Kunzel

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.

Polyoxyalkylene-polysiloxane block polymers, a process for preparing them and their use as defoamers in aqueous dispersions

Polysiloxane-polyoxyethylene-polyoxypropylene triblock copolymers having the general formula: ##STR1## as well as compounds for the defoaming of aqueous dispersion paints that are disclosed contain the copolymers as effective defoaming components.

Polysiloxane-polyoxyethylene-polyoxypropylene triblock copolymers and

Polyoxyalkylene-polysiloxane block copolymers are disclosed which exhibit an outstanding defoaming action and have the special advantage of not causing wetting defects when dispersions defoamed therewith are applied on a 2-dimensional substrate. Dispersions of polymeric organic substances, especially dispersions of vehicles, coating agents and adhesives are defoamed by the addition of 0.01 to 2.0% by weight, based on the dispersion to be defoamed, of a polyoxyalkylene-polysiloxane block copolymer of the formula,

Method for defoaming aqueous dispersions of polymeric organic substances

Alkoxysiloxanes of the general formula ##STR1## are disclosed wherein R.sup.1 is methyl or ##STR2## and/or ##STR3## the sum of the units a being 0 to 100, the sum of the units b being 0 to 15, with the proviso that the ratio of methyl to alkoxy groups in R.sup.1 is less than 50:1, and that b.gtoreq.1 when a=0 and a.gtoreq.5 when b=0. The compounds may be synthesized by known methods from halogen- or alkoxysiloxanes, the alkoxy group of which has 1 to 4 carbon atoms. The compounds are effective deaerating agents for curable resins and plastisols. The invention is also directed to compositions containing the novel deaerating compounds as well as to methods for deaerating coating systems.

Siloxanes, their synthesis and use as deaerating agents for curable

An aqueous composition for coating substrates which contains polymeric organic film formers containing a deaerating effective amount of a linear polymer having at least five side groups, each of which contains a silicon atom which is linked by way of a divalent hydrocarbon group to the polymer, each silicon atom carrying at least one R.sup.1 group of formula

Material for deaerating coating systems

This invention relates to a thermosetting, substrate-free, storage-resistant synthetic resin foil which is hard, scratch- and abrasion-proof in the hardened state, comprising: (a) about 60 to 95% by weight of a hardenable polyester resin, (b) about 1 to 15% by weight of a cross-linking agent for the polyester resin, (c) about 5 to 40% by weight of a thermoplastic containing predominantly linear, high-molecular weight reactive groups, (d) about 1 to 15% by weight of a monomer with at least one polymerizable double bond and at least one group reactable with the reactive group of the thermoplastic under the conditions of reaction, (e) and at least one hardening catalyst, and optionally dyestuffs, pigments and/or fillers. The invention also relates to a process for preparing the novel foil of the invention.

Substrate-less, thermosetting synthetic resin foil

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Essen, Germany

Otto Klocker