Wacker Chemie Ag

Oliver Minge

Peter Ball

Hans-Peter Weitzel

Richard Weidner

Frank Sandmeyer

Albert Hausberger

Martin Bortenschlager

Andrea Kneissl

Sabine Delica

The invention relates to a process for free-radically initiated heterophase polymerization, in which the polymerization of ethylenically monomers proceeds in a phase dispersed in the continuous phase, characterized in that one or more additives which are soluble in the continuous phase and insoluble in the disperse phase and stop the polymerization of the ethylenically unsaturated monomers in the continuous phase is/are added before or during the polymerization.

Free-radical polymerization process

Storage stable compounds having at least two organopolysiloxane groups and at least one methylol group are useful as coatings on textile, paper, and other substrates, and are post-crosslinkable.

Silicone polymers crosslinkable via methylol groups

Nanoparticulate silicone organo copolymers exhibit controlled hydrophobicity in composite thermal insulation systems.

Nanoparticulate silicone organo copolymers and use thereof in coating compositions

The invention provides copolymers of ethylenically unsaturated monomers and of ethylenically functionalized nanoparticles in the form of their aqueous polymer dispersions or water-redispersible polymer powders, obtainable by means of free-radically initiated polymerization in an aqueous medium and, if desired, subsequent drying of the resultant polymer dispersion, of A) one or more monomers from the group consisting of vinyl esters, (meth)acrylic esters, vinylaromatics, olef ins, 1,3-dienes, vinyl ethers and vinyl halides and, if desired, further monomers copolymerizable therewith, in the presence of B) at least one particle P having an average diameter of &#x2266;1000 nm, which is functionalized with ethylenically unsaturated, free-radically polymerizable groups, characterized in that B2) particles P used are one or more from the group of metal oxides and semimetal oxides, and/or B2) particles P used are silicone resins composed of repeating units of the general formula [RSiO] (II), where for at least 20 mol % of the respective silicone resin p+z=0, 1 or 3, and where B1) and B2) are each functionalized with one or more &#x3b1;-organosilanes of the general formula (RO)(R)Si&#x2014;(CR)&#x2014;X (I), where X is a radical having 2 to 20 hydrocarbon atoms and containing an ethylenically unsaturated group.

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Munich, Germany

Oliver Minge