Basf Aktiengesellschaft

Basf Corporation

Roland Minges

Bernd Bruchmann

Friedhelm Lehrich

Siegmund Pohl

Dietrich Scherzer

Helmut Tesch

Manfred Genz

Joachim Streu

Christian Schade

Claudia Spang

Heinz-Dieter Lutter

Johann Swoboda

Peter Keller

Wolfgang Heider

Ruth Zschiesche

Guenter Scholz

Konrad Stiefenhoefer

Michael Lugmayr

Werner Langer

Willy Van Pee

Franz Merger

Gunnar Schornick

Kaspar Bott

Wolfgang Schmidt

Wolfgang Schwarz

Wolfgang Straehle

Hans Volkmar Schwarz

Peter Magnussen

Thomas Anstock

Andreas Otterbach

Bernhard Otto

Eckhard Neufeld

Hans-Ulrich Moritz

J&uuml;rgen Schmidt-Th&uuml;mmes

Wilfried Seyfert

Jens Kremesk&ouml;tter

Otto Mattner

Eckhardt Brandt

Wolfgang H&uuml;binger

Horst King

Deitrich Scherzer

Christof Herrmann

Arnold Schmitt

Maren Ridder

Paul Jacobs

Hans-J Urgen Krauss

J Urgen Tropsch

Hans-Joachim H Ahnle

A curved tubular flow reactor designed for carrying out chemical reactions continuously, for preparing mixtures and as a liquid-phase heat exchanger comprises a plurality of successive bends having alternating directions of curvature.

Continuous flow reactor having a plurality of alternating bends

Mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (raw MDI) having a reduced iodine color number and a reduced chlorine content are prepared by reacting the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, and then, after phosgenation is complete, incorporating into the reaction mixture, in the presence or absence of the phosgene, a mixture of water and at least one monohydric or polyhydric polyoxyalkylene alcohol, preferably having a functionality of from 2 to 3, and advantageously having a hydroxyl number of from 20 to 1800, in an effective amount which advantageously comprises from more than 0.01 to 0.3% by weight of water (i) and from 0.5 to 5% by weight of a polyoxyalkylene alcohol (ii), in each case based on the weight of raw MDI, then removing the excess phosgene or the phosgene residues still present and the inert organic solvent, if desired adding to the reaction product up to 5% by weight, based on the weight of raw MDI, of at least one antioxidant based on phenol and/or aryl phosphite and thermally treating the reaction mixture.

Preparation of mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced iodine color number and a reduced chlorine content

4,4'-disubstituted bis(2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

4-substituted bis(2,6-diisopropylphenyl)-carbodiimides, their

Polymeric, catalytically-active compounds having imidazole groups linked terminally and/or laterally to the polymer chain through reactive groups on the polymer chain are disclosed. The polymer chain is selected from the group consisting of polyether ketones; acidic, basic, or neutral ion exchange resins; polymeric isocyanates; polymers or copolymers containing maleic acid or maleic anhydride; and polymers containing benzyl halide groups.

Polymeric, catalytically active compounds, their preparation, and their

Process for the preparing high molecular weight polymers by polymerization of water-soluble, monoethylenically unsaturated moonomers and, if desired, crosslinkers, and, if desired, water-insoluble monoethylenically unsaturated monomers, in aqueous solution in the presence of polymerization initiators in a tubular reaction which at the end has a conical taper, the ratio of the diameter of the reactor (D1) to the diameter at the end of the conical taper of the reactor (D2) being from 2:1 to 25:1 and the angle between D1 at the beginning of the conical taper and the inner cone wall being &gt;45.degree. and &lt;90.degree., and discharge of the gelatinous reaction mixture from the reactor by injection of an inert gas.

Preparation of high molecular weight polymers

4,4'-disubstituted bis-(2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

4-substituted bis (2,6-diisopropylphenyl)- carbodiimides, their

In a reactor for the thermal cleavage of mono- and polyfunctional carbamic esters into the corresponding isocyanates and the hydroxyl component in the liquid phase, the geometry of the reactor, defined by the degassing area in relation to the volume and the arrangement of the heating surfaces, permits cleavage in a two-phase mixture which has a volumetric gas content of more than 50%.

Thermal cleavage of carbamic esters

Novel carbodiimides and/or oligomeric polycarbodiimides containing terminal isocyanate, urethane and/or urea groups are obtainable, for example, by condensation of 1,3-bis(1-methyl-1-isocyanatoethyl)benzene with elimination of carbon dioxide followed, if desired, by reaction of all or some of the free isocyanate groups of the resultant (poly)carbodiimides with aliphatic, cycloaliphatic or araliphatic amines, alcohols and/or alkoxypolyoxyalkylene alcohols, and are used as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups.

Carbodiimides and/or oligomeric polycarbodiimides based on 1 3-bis

The invention relates to a process for the preparation of CFC-free, flexible polyurethane foams or molded foams by reacting

Preparation of chlorofluorocarbon-free flexible polyurethane foams using

Polymeric, catalytically active compounds comprising polymer chains to which imidazole groups are linked terminally or laterally are used as catalysts for the dimerization of isocyanates.

4,4'-disubstituted bis-2,6-diisopropylphenyl)carbodiimides of the formula (I) ##STR1## where R is 1-methyl-1-phenylethyl, phenoxy or tert-butyl, a process for their preparation, their use as stabilizers against hydrolytic degradation of polyaddition and polycondensation products containing ester groups, and the novel 4-(1-methyl-1-phenylethyl)-2,6-diisopropyl-, 4-phenoxy-2,6-diisopropyl- and 4-tert-butyl-2,6-diisopropylphenyl isocyanates which can be used for their preparation.

There is now provided a carbodiimide or polycarbodiimide of the formula: ##STR1## where the R radicals are identical or different and are selected from the group consisting of --NHCONHR.sup.1 --, --NHCONR.sup.1 R.sup.2 --, and --NHCOOR.sup.3 --, where R.sup.1 and R.sup.2 may be identical or different and are alkyl, cycloalkyl, or aralkyl, and R.sup.3 is identical to R.sup.1 or is alkoxypolyoxyalkylene, and n is an integer from 0 to 10. There is also provided an ester containing plastic which contains this carbodiimide as an anti-hydrolysis agent. The plastics may be a polyurethane cellular or non-cellular elastomer or thermoplastic.

Carbodiimides and/or oligomeric polycarbodiimides based on

The present invention relates to novel carbodiimides or oligomeric polycarbodiimides containing terminal isocyanate, urea and/or urethane groups, methods for their preparation, and their use as hydrolysis stabilizers.

Carbodiimides and/or oligomeric polycarbodiimides based on 1,3-bis

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Roland Minges