Dow Corning Corporation

Dow Corning Toray Company, Ltd.

Dow Corning Europe Sa

Giada Tonet

Tadashi Okawa

Masaru Ozaki

Tomohiro Iimura

Bethany Johnson

Robert A Ekeland

Andreas Stammer

Delphine Davio

Shinya Oguri

Anne-Marie Vincent

The invention relates to branched organopolysiloxanes and to their preparation and use. A branched organopolysiloxane is prepared by the reaction of an alkoxysilane with a substantially linear organopolysiloxane containing at least one hydroxyl or hydrolysable group bonded to silicon, in the presence of a phosphazene catalyst. The branched organopolysiloxanes obtained can be suitable for use in a moisture curable sealant composition capable of curing to a high modulus seal, with less tendency to gel than when using other siloxane polycondensation catalysts. Phosphazene catalysts also have the advantage that the content of undesired low molecular weight cyclic silicones in the polymerization product is low.

Branched organopolysiloxanes

The present invention relates to an amino acid-modified organopolysiloxane emulsion obtainable by reacting (a) a carboxy-unprotected amino acid, and (b) organopolysiloxane having an epoxy group in the molecule in an aqueous medium in the presence of a surfactant, is incorporated in a cosmetic product. The present invention also relates to the simple and highly efficient production of emulsions of amino acid-modified polysiloxane, as well as the use of the emulsions as beautifying components.

Method of producing amino acid-modified organopolysiloxane emulsions

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Chapelle-les-Herlaimont, Belgium

Giada Tonet