Bayer Materialscience Ag

Lanxess Deutschland Gmbh

Jürgen Kirsch

Heinz Pudleiner

Richard Kopp

Edgar Leitz

Gerhard Wegener

Detlev Joachimi

Dietmar Wastian

Daniel Koch

Klaus Zander

Spotswood Miller

Ricardo Serra

Wladimir Michajlowitsch Nikitin

Gennadij Grigorjewitsch Sawkin

Hardy Jüngermann

Igor Leonidowitsch Ryshakow

Jelena Saweljewna Nasarowa

Burkhard Werden

Peter-Alexander Gottschalk

Klaus Mader

Alexander Iwanovitsch Korschunow

Konstantin Awtonomowitsch Kapitanow

A two-stage process for the preparation of organic isocyanates by reacting primary amines with phosgene in which: a) in a first stage, amine and phosgene are reacted in an adiabatically managed reaction, in which the temperature of reaction is restricted to values between 100 and 220&#xb0; C. by actively adjusting the absolute pressure in the reactor to values between 8 and 50 bar by decompression, and the temperature is held at values between 100 and 220&#xb0; C. until the stoichiometric conversion of phosgene has reached at least 80%; and then b) in a second stage, the reaction mixture from a) is decompressed to an absolute pressure of 1 to 15 bar and the reaction mixture is reacted further at temperatures between 90 and 240&#xb0; C., optionally with the introduction of heat.

Process for preparing polyisocyanates by the adiabatic phosgenation of primary amines

The present invention provides a mixture containing a) at least 26 wt. % of gadolinium and b) one or more elements, alloys and/or compounds from the group consisting of barium, indium, tin, lanthanum, molybdenum, niobium, tantalum, zirconium and tungsten, a process for the preparation of this mixture, use of the mixture as radiation protection, use of the mixture to prepare polymeric radiation protection substances, a process for preparing radiation screening rubbers, thermoplastic materials and polyurethanes, a process for preparing products from the polymeric radiation protection substances and products made from these polymeric radiation protection substances.

Lead-free mixture as a radiation protection additive

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Leverkusen, Germany

Jürgen Kirsch