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Dierk Frank, Fritz Schwertfeger, Andreas Zimmermann: Aerogel-coated sheet. Hoechst Research & Technology Deutschland & Co KG, November 13, 2001: US06316092 (15 worldwide citation)

The invention concerns a coated sheet which includes an aerogel layer, a method of manufacturing the coated sheet and its use.


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Freddy Helmer Metzmann, Andreas Schleicher, Arnold Schneller, Helmut Witteler: Polymer electrolytes and process for their production. Hoechst Research & Technology Deutschland & Co KG, Frommer Lawrence Haug, August 1, 2000: US06096856 (15 worldwide citation)

The invention relates to a process for the chlorosulfonation of polyarylene sulfide in which the polyarylene sulfide is completely dissolved in chlorosulfonic acid at a temperature of -10 to +20 C., then agitated at reaction temperatures in the +5 to +20 C. range for a reaction time of 180 min at th ...


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Arnold Schneller, Helmut Witteler: Process for producing a cation-exchanging polymer electrolyte membrane (PEM). Hoechst Research & Technology Deutschland & Co KG, Frommer Lawrence & Haug, April 10, 2001: US06214891 (5 worldwide citation)

A method for preparing a cation exchange membrane, comprising the introduction of an organic polymer having sulfonic acid groups and of finely disperse electrically conductive particles of a catalyst material into a liquid phase, the resulting suspension being used to coat a foil of a cation exchang ...


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Holger Borchert, Uwe Dingerdissen, Ranier Roesky: Process and catalyst for preparing acetic acid by catalytic oxidation of ethane. Hoechst Research & Technology Deutschland & Co KG, Bierman Muserlian and Lucas, August 14, 2001: US06274765 (4 worldwide citation)

A process is disclosed for selectively preparing acetic acid from a gaseous feed of ethane, ethylene or mixtures thereof, as well as oxygen, at an increased temperature, on a catalyst which contains the elements W, X, Y and Z in the gram-atom ratio a:b:c:d, associated with oxygen. In the formula W


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Toshiaki Nonaka, Ayako Takeichi, Li Ji, Kazuya Nagao, Rainer Wingen, Javier Manero, Barbara Hornung, Wolfgang Schmidt: Ferroelectric liquid crystal mixture. Hoechst Research & Technology Deutschland & Co KG, Frommer Lawrence & Haug, January 9, 2001: US06171519 (3 worldwide citation)

A ferroelectric liquid crystal mixture having a negative value of &Dgr;e and allowing a high speed response and a low voltage driving, as well as a liquid crystal display devise using the crystal mixture of the invention. The ferroelectric liquid crystal mixture according to the invention comprises ...


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Holger Borchert, Uwe Dingerdissen, Ranier Roesky: Method and producing acetic acid in a reactor cascade. Hoechst Research & Technology Deutschland & Co KG, Bierman Muserlian and Lucas, December 30, 2003: US06670504 (3 worldwide citation)

The invention relates to a method for producing acetic acid from ethane and oxygen on a fixed bed catalyst, characterized in that a reactor cascade with an oxygen feed between the reactor levels is used. This particularly advantageous method provides high conversion rates, highly pure acetic acid an ...


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Holger Borchert, Uwe Dingerdissen, Jens Weiguny: Process for the selective preparation of acetic acid using a molybdenum, palladium, and rhenium catalyst. Hoechst Research & Technology Deutschland & Co KG, Frommer Lawrence & Haug, March 7, 2000: US06034270 (2 worldwide citation)

A process for the selective preparation of acetic acid from a gaseous feed comprising ethane, ethylene or mixtures thereof plus oxygen at elevated temperature, which comprises bringing the gaseous feed into contact with a catalyst comprising the elements Mo, Pd, Re, X and Y in gram atom ratios a:b:c ...