Degussa Aktiengesellschaft

Degussa - Huls Ag

Evonik Degussa Gmbh

Rainer Hahn

Klaus Huthmacher

Steffen Krill

Frank Hubner

Stipan Katusic

Horst Weigel

Wilhelm Keim

Günther Michael

Herbert Tanner

Stephan Kretz

Hans-Joachim Hasselbach

Stefan Heberer

Hermann Schmitt

Juri Tschernjaew

Ralph Brandes

Wojciech Pisula

Arnold Storeck

Gunes Giray

Michael Kröll

Ulrich Gora

Armin Kraus

Stephanie Schäffer

Markus PRIDÖHL

Meike Pelz

The present invention relates to functional composite particles for the oral care sector, more particularly for toothpastes and mouthwashes, which are charged with active ingredients which ensure a long-term antimicrobial or antibacterial effect in the oral cavity and hence reduce the formation of plaque and halitosis. The invention further relates to a process for producing these composite particles and also to their use for producing oral hygiene articles.

Composite particles for use in oral hygiene

A dispersion of pyrogenically produced cerium oxide, which does not contain any particles larger than 1 &#x3bc;m, is produced by dispersing a pyrogenically produced cerium oxide in water by means of a dissolver, centrifuging it, separating the supernatant from the bottom product, and again dispersing the supernatant by means of ultrasound. The dispersion can be used for chemical-mechanical polishing (CMP).

Dispersion of pyrogenically produced cerium oxide

The present application refers to a process for preparing 6,10- and 6,9-dimethyl-5,10-undecadienyl-2-ones by telomerizing isoprene with alkyl acetoacetates in the presence of a catalyst system containing a transition metal compound catalyst and a phosphorus- or arsenic-containing compound cocatalyst, wherein the process is performed in the presence of a protic additive of the general formula

Method for producing 6,10 and 6,9-dimethyl-5,10-undecadienyl-2-ones

A process for the preparation of 3,5,5-trimethylcyclohexa-3-en-1-one (&bgr;-isophorone) by isomerization of 3,5,5-trimethylcyclohexa-2-en-1-one (&agr;-isophorone) in the liquid phase in the presence of a salt-like or organometallic catalyst. By using catalytic quantities of alkali-metal salts or alkaline-earth salts and/or their organometallic compounds, and without addition of a further auxiliary substance, the space-time yield in the preparation of &bgr;-isophorone is high. &bgr;-Isophorone is particularly suitable as an intermediate product for the preparation of ketoisophorone.

Process for the preparation of 3,5,5-trimethylcyclohexa-3-en-1-one (&bgr;-isophorone) by isomerization of 3,5,5- trimethylcyclohexa-2-en-1-one (&agr;-isophorone)

A process for the production of .alpha.-tocopherol esters, derivatives or homologs thereof of the general formula ##STR1## in which the mono- or diester of a hydroquinone is reacted with an allyl alcohol derivative or an allyl alcohol in the presence of zinc halides and proton-liberating acids at a temperature of 25.degree. to 100.degree. C.

Process for the production of .alpha.-tocopherol esters

A method of producing 3,5,5-trimethylcyclohexa-3-ene-1-one (.beta.-isophorone) by isomerization of 3,5,5-trimethylcyclohexa-2-ene-1-one (.alpha.-isophorone) in a liquid phase in the presence of a homogeneous or heterogeneous catalyst in which a mixture with a relatively low concentration of .beta.-isophorone is drawn off from the reaction container and the .beta.-isophorone isolated by vacuum distillation. .beta.-isophorone is an important synthetic structural element for the production of carotinoids, vitamins and pharmaceutical products.

Method of producing .beta.-isophorone by the isomerization of

An improved method of producing 3,5,5-trimethylcyclohex-2-ene-1,4-dione (KIP) by the oxidation of 3,5,5-trimethylcyclohex-3-ene-1-one (.beta.-IP) in the presence of managansalene-like catalysts and certain catalytic additives. ##STR1## KIP is an important intermediary product in the synthesis of trimethylhydroquinone, an initial substance in the synthesis of vitamin E. Furthermore, KIP is an initial compound for the synthesis of various carotinoids.

Method of producing ketoisophorone

Growing community of inventors

Karlstein, Germany

Rainer Hahn