Hoechst Aktiengesellschaft

Solvay (societe Anonyme)

Clariant Produkte (deutschland) Gmbh

Hans-Matthias Deger

Rudiger Marquardt

Johann Then

Joachim Thiem

Wolfram Fritsche-Lang

Matthias Kreuzer

Horst Robeck

Susanne Grabley

Klaus Bartsch

Klaus-Jurgen Behme

Werner Krause

Merten Schlingmann

Rudiger Erckel

Gerhard Wohner

Rainer Buchholz

Claudia Schutz

Martyn K Robinson

Harald Bauer

Joachim Wink

Cenek Kolar

Wolfgang Wiedemann

Klaus Raab

Raimund Franz

Rolf-Michael Jansen

Hartmut Voelskow

Dieter Schmid

Gert-Wolfhard Von Rymon Lipinski

Dieter Guenther

Horst Fruhbeis

Ewald Preisegger

Rolf Woernle

Thomas Bayer

Klaus J Behme

Siegismut Hug

Evelyn L Doherty

Andrew Doherty

Rainer Henrici

Martin Hoeveler

The invention relates to an elastic covering material, which comprises, as a flame retardant, a phosphinate salt of the formula (I) and/or a diphosphinate salt of the formula (II) and/or polymers thereof where The invention relates to processes for producing such elastic covering materials.

Elastic covering material having improved flame retardant properties and production thereof

L-tertiary-Leucine and L-phosphinothricine are obtainable by transamination of the corresponding keto acids as a precursor in the presence of amino acids as amino group donors. The reaction is preferably carried out with microorganisms or their transaminases.

Process for preparing L-tertiary-leucine and L-phosphinothricine by

The invention relates to a process for preparing pentafluoroethane (R 125) by reacting perchloroethylene with hydrogen fluoride in the gas phase over a chromium-containing catalyst, wherein the catalyst used comprises chromium and magnesium and is obtainable by reacting a water-soluble chromium(III) salt with magnesium hydroxide or magnesium oxide and, if desired, graphite in the presence of water, converting the reaction mixture into a paste, then drying the paste and treating it with hydrogen fluoride at temperatures of from 20.degree. to 500.degree. C., using such amounts of chromium(III) and magnesium salts and, if desired, graphite that the dried paste before treatment with hydrogen fluoride contains from 4.5 to 26% by weight of Cr, expressed as Cr.sub.2 O.sub.3, and at least 25% by weight of Mg, expressed as MgO, and, if desired, graphite.

Process for preparing pentafluoroethane (R 125)

Process for preparing L-tertiary-Leucine and L-phosphinothricine by

A sterilant gas mixture is presented for cold-gas sterilization, which comprises alkene oxide and 1,1,1,2,3,3,3-heptafluoropropane. The sterilant gas mixture comprises from 12 to 22 mol % of ethylene oxide or propylene oxide and from 78 to 88 mol % of 1,1,1,2,3,3,3-heptafluoropropane.

Sterilant gas mixture comprising alkylene oxide and

A process for disposing of bromofluorocarbons, bromochlorofluorocarbons, or mixtures of any of bromofluorocarbons, bromochlorofluorocarbons, fluorocarbons, or chlorofluorocarbons. The process comprises thermally cleaving halons, halon-containing fluorocarbons, or halon containing chlorofluorocarbons, cooling the resulting gas stream, oxidizing the resulting hydrogen bromide to bromine by feeding excess elemental chlorine into the gas stream, absorbing the resulting HF or HCl from the gas stream with recovery of hydrofluoric acid or hydrochloric acid, and finally separating elemental bromine and chlorine from each other by distillation or reducing both to give the salts.

Process for disposing of halons or halon-containing fluorocarbons or

The invention relates to an azeotrope-like mixture which contains about 8-12% by weight of 2-propanol and about 88-92% by weight of 1H-perfluorohexane and to a process for cleaning electronic components, in particular soldered circuit boards or printed circuits, with the aid of this mixture.

Azeotrope-like mixture of 2-propanol and 1H-perfluorohexane

The invention relates to an azeotrope-like mixture which contains about 5-9% by weight of methanol and about 91-95% by weight of 1 H-perfluorohexane and to a process for cleaning electronic components, in particular soldered circuit boards or printed circuits, with the aid of this mixture.

Azeotrope-like mixture of methanol and 1H-perfluorohexane

Process for the manufacture of foams with the aid of blowing agents containing fluoroalkanes and fluorinated ethers, and foams obtained by this process. The invention relates to a process for the manufacture of foams based on polyisocyanates by the reaction of polyisocyanates, compounds containing at least two hydrogen atoms reactive towards isocyanate groups, blowing agents and, if appropriate, other additives. The blowing agents used consist to the extent of at least 10 mol % of at least one fluoroalkane of formula (I), C.sub.a H.sub.b F.sub.c, where a=2-6, b=1-12, and c=2-13, and at least one fluorinated ether of formula (II), C.sub.a H.sub.b F.sub.c O-C.sub.d H.sub.e F.sub.f, where a=1-6, b=1-12, c=1-12, d=1-2, e=0-5 and f=0-5. The invention further relates to the foams obtained by this process.

Process for the manufacture of foams with the aid of blowing agents

The invention realtes to a process for producing foams based on polyisocyanates by reacting polyisocyanates, compounds having at least two hydrogen atoms reactive towards isocyanate groups, blowing agents and, if appropriate, further additives. In this process, a blowing agent is used which is composed to the extent of at least 10 mol % of one or more fluoroalkanes of the formula I

Process for producing foams with the aid of fluoroalkanes

The invention relates to a process for the production of foams based on polyisocyanates by reaction of polyisocyanates, compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, blowing agents and if appropriate other additives. A blowing agent which consists to the extent of at least 10 mol % of one or more branched dodecafluorohexanes is used here.

Process for the production of foams with the aid of branched

The invention relates to a process for producing foams based on polyisocyanates by reacting polyisocyanates, compounds having at least two hydrogen atoms reactive towards isocyanate groups, blowing agents and, if appropriate, further additives. In this process, a blowing agent is used which is composed to the extent of at least 10 mol % of one or more fluorinated ethers of the formula

Process for producing foams

The ilvE gene from the strain E. coli ATCC 11303 is suitable for achieving overproduction of the coded aliphatic transaminase and thus for preparing the branched-chain amino acids leucine, isoleucine and valine from the corresponding keto precursors.

Cloning and use of the transaminase gene ilvE

The isolation of the tyrB gene contained in E. coli ATCC 11303 and its cloning onto a multicopy plasmid results in a 10-fold increase in the L-phenylalanine yield after the transformation of the starting strain with this plasmid.

Cloning and use of transaminase gene tyrB

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Hofheim am Taunus, Germany

Hans-Matthias Deger