Bayer Aktiengesellschaft

Karl-Heinz Mitschke

Hans Niederprum

Manfred Kapps

Reinhard Schliebs

Gunther Boehmke

Ottfried Schlak

Johannes Kaulen

Kaspar Hallenberger

Klaus Geisler

Christoph Holzner

Johann-Nikolaus Meussdoerffer

Preparation of triethyl phosphate

The present invention relates to a process for the preparation of symmetrically substituted phosphoric acid diesters of long-chain linear or branched alcohols of chain length C.sub.4 to C.sub.22.

Dialkylphosphoric acids by the methanol method

Employing as surface active agents salts of perfluoroalkane sulphonamides, preferably of the formula ##STR1## in which R.sub.F is a perfluorinated aliphatic group having 4 to 20 C-atoms,

Use of perfluoroalkane sulphonamide salts as surface active agents

1,1-Difluoro-2-chloroethylene is used as the propellant in an aerosol spray can. It is reasonably stable and non-flammable but will in time degrade in the atmosphere.

1,1-Difluoro-2-chloroethylene as aerosol propellant

A process for the preparation of a hydroxyalkylperfluoroalkane sulphonamide of the formula ##STR1## wherein R.sub.F is a perfluoroalkyl group having from 1 to 20 carbon atoms;

Process for the preparation of hydroxyalkylperfluoroalkane sulphonamides

The invention relates to a process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl esters corresponding to the following general formula: ##STR1## wherein each R, may be the same or different and represents hydrogen or, preferably, a lower, linear or branched alkyl radical or halogen-substituted alkyl radical containing from 1 to 6 carbon atoms.

Process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane

A process for the production of a relatively high molecular weight phosphoric or phosphonic acid aryl ester, comprising reacting a phosphoric or phosphonic acid aryl ester with formaldehyde in the presence of sulphuric acid at a temperature from about 10.degree. to 120.degree. C. Advantageously, the aryl ester is of the formula ##STR1## in which R is a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms, a halogen atom, an aryloxy group, or an aryl group;

Production of high viscosity phosphoric and phosphonic acid aryl esters

In the production of a foamed synthetic material by the reaction of starting materials which undergo a polymerization, polycondensation or polyaddition reaction to produce a high molecular weight synthetic material in the presence of a blowing agent, e.g. a polyurethane, or by foaming an unfoamed thermoplastic synthetic material by means of a blowing agent, the improvement which comprises employing 1,1,1-trifluoro-2-chloroethane as the blowing agent, optionally in admixture with 1,1-difluoro-2-chloroethane.

1,1,1-Trifluoro-2-chloroethane as blowing agent for polyurethane foam

Production of tetraethyl ammonium perfluoroalkyl sulphonates (C.sub.2 H.sub.5).sub.4 N.sym.R.sub.F SO.sub.3 .crclbar., wherein R.sub.F represents a perfluorinated alkyl radical with about 4 to 10 carbon atoms, by reacting crude perfluoroalkyl sulphonic acid fluoride, i.e. perfluoroalkyl sulphonic acid fluoride which has not been especially purified, with triethylamine and an ethoxy silane, preferably dimethyl diethoxy silane, methyl triethoxy silane or tetraethoxy silane in an inert solvent at temperatures of about 10.degree. to 60.degree. C., preferably about 20.degree. to 40.degree. C. The process according to the invention is particularly suitable for the production of tetraethyl ammonium perfluorooctane sulphonate.

Production of tetraethyl ammonium perfluoroalkyl sulphonate

Process for the preparation of phosphates of the formula ##STR1## wherein R represents hydrogen, alkoxy or alkyl having 1 to 8 C atoms, perfluoroalkyl having 1 to 8 C atoms, or halogen, a is 0.05 to 3.0, b is 0, 1, 2 or 3 and c is 1 or 2, by brominating the corresponding aroxyalkyl-(.beta.-chloroalkyl) phosphates, characterized in that aroxyalkyl-(.beta.-chloroalkyl) phosphates are reacted at temperatures between about -10.degree. and 80.degree. C. with an approximately equimolar mixture of bromine and chlorine, especially bromine chloride.

Process for the preparation of bromoaroxyl-alkyl-(.beta.-chloroalkyl)

A process for the preparation of brominated aryl dichlorophosphates or diaryl chlorophosphates of the formula: ##STR1## WHEREIN R each independently is hydrogen, an alkoxy radical or alkyl radical containing 1 to 10 C-atoms, a perfluoroalkyl radical containing 1 to 10 C-atoms, halogen, the group --NO.sub.2, --SO.sub.3 H, Cl.sub.2 P(O)O-- or Cl.sub.2 P(O)OC.sub.6 H.sub.4 - CR'.sub.2 --,

Production of bromoaryl chlorophosphates

A process for the production of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dialkyl esters of the formula ##STR1## in which R is an optionally substituted alkyl radical with 2 to 10 carbon atoms, and

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Odenthal, Germany

Karl-Heinz Mitschke