Bayer Aktiengesellschaft

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Dieter Dieterich

Peter Markusch

Helmut Reiff

Wolfgang Wenzel

Werner Rasshofer

Hans-Joachim Scholl

Josef Sanders

Gerhard Balle

Gerhard Grogler

Harro Traubel

Holger Meyborg

Werner Dietrich

Rainer Welte

Otto Lorenz

Hans G Schmelzer

Klaus Friederich

Klaus Konig

Heinz U Blank

Wulf Von Bonin

Karlfried Wedemeyer

Richard Kopp

Klaus Nachtkamp

Artur Reischl

Manfred Dietrich

Josef Merten

Klaus Noll

Dietrich Michael

Walter Schroer

Rudolf Hombach

Erich Wolters

Manfred Dollhausen

Helmut Kleimann

Jurgen Grammel

Karl-Arnold Weber

Klaus-Peter Heise

Marcel Petinaux

Kurt Schaupp

Karl Schafer

Helga Heinze

Hans-Jurgen Lienert

Norbert Langenfeld

Ulrich Haberland

Gerhard Heinze

Hans Schuster

Peter Markush

Rene Stepanek

Norbert Kunstler

Gunter Mertens

Manfred Schon

Karl Berger

This invention relates to a process for the preparation of N,N-disubstituted mono- and oligourethanes by the reaction of N-aromatically, N-aliphatically, N-cycloaliphatically, and N-araliphatically substituted mono- and oligourethanes with dialkyl carbonates in the presence of at least stoichiometrically equivalent quantities of solid alkali or alkaline-earth carbonate in excess dialkyl carbonate and/or an aprotic organic solvent and in the presence of a phase transfer catalyst.

Process for the preparation of mono- and oligourethanes

N,N-disubstituted monourethanes and oligourethanes are produced by reacting (a) N-aliphatically and/or N-cycloaliphatically and/or N-araliphatically substituted monourethanes and/or oligourethanes with an alkylating agent in the presence of a solid alkali metal hydroxide. No solvent need by employed but if a solvent is used, that solvent should be an aprotic organic solvent. The alkali metal hydroxide must be used in an equivalent amount. A phase transfer catalyst may optionally be employed. The N,N-disubstituted urethanes obtained by this process are useful in the production of dyes, pharmaceutical products and thermostable synthetic materials.

Process for the preparation of N,N-disubstituted mono- and oligourethanes

The present invention relates to N,N-disubstituted compounds containing urethane groups and terminal hydroxyl groups corresponding to the general formula ##STR1## wherein X is the residue of a strong memobasic or polybasic acid remaining after dissociation of the proton or protons of said acid or a hydroxyl group;

N, N-disubstituted oligourethanes and polyurethanes, a process for their

The present invention thus relates to new compounds containing aminophenoxy end groups corresponding to the formula ##STR1## wherein R.sub.1 denotes an n-valent group as obtained by the removal of hydroxyl groups from an n-valent polyhydroxyl compound having a molecular weight of about 400 to about 12,000, preferably 400 to about 6,000,

Process for the preparation of aromatic polyamines

The present invention relates to crosslinked polyurethane-polyurea powders which are prepared by a process which comprises dispersing NCO semiprepolymers in an aqueous medium, forming powders and isolating the powders from the aqueous medium, the NCO semiprepolymers having an NCO content of 10 to 20%, being liquid at room temperature and/or dissolved in isocyanate-inert, water-soluble solvents and based on the reaction product of

Crosslinked polyurethane-polyurea powders, a process for their

This invention relates to diaminoarylsulfones of the formula ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 are independently C.sub.1 -C.sub.12 alkyl, that are useful as chain extenders in the preparation of polyurethane elastomers.

Diaminoarylsulfones useful for the preparation of polyurethane elastomers

New compounds containing isocyanatophenoxy groups, corresponding to ##STR1## wherein R.sup.1 denotes a residue of a n-valent polyhydroxyl compound having a molecular weight of about 92-6000, R.sup.2 denotes hydrogen or methyl group and n denotes an integer of from 3 to 8 were found to be suitable as hardeners in the preparation of adhesives.

Aromatic polyisocyanates, their preparation and use as components for

The present invention is directed to new aromatic diamines containing sulfonic acid aryl esters corresponding to the formula ##STR1## wherein R.sub.1 represents hydrogen, an optionally branched C.sub.1 -C.sub.6 alkyl radical (preferably a methyl group), a C.sub.1 -C.sub.6 alkoxy radical or a halogen atom (preferably chlorine) and

Aromatic diamines containing sulfonic acid aryl esters, a process for

Modified polyamines containing carbamates, urethane and/or urea and/or thiourethane groups and having a primary amine content of from 0.1 to 20.2 wt % are produced by (a) mixing an organic isocyanate with a base in the presence of at least one hydrogen-active compound and water and (b) converting the carbamate, urethane and/or urea and/or thiourethane groups to amino groups. The isocyanate starting material has an isocyanate content of from 0.5 to 40 wt. %. The hydrogen-active compound contains a hydroxy and/or amino and/or thiol group. Water is used in a quantity such that one mol of water is present for each isocyanate equivalent. Conversion to form the amino groups is accomplished by treatment with a proton donor and/or thermal decomposition and/or solvent extraction. The polyamines thus-produced are particularly useful in the production of polyurethanes.

Modified polyamines and a process for their production

The present invention relates to water-dispersible plastics precursors which are solid at temperatures below about 40.degree. C. The plastics precursors are based on isocyanate-terminated prepolymers which have been hydrophilically modified with ionic groups and/or ethylene oxide units and which contain specified amounts of isocyanate groups and --NH-- groups. The present invention also relates to processes for preparing aqueous dispersions from the solid plastics precursors and to using the plastics precursors for cross-linking dispersed plastics containing isocyanate-reactive groups.

Solid, water-dispersible plastics precursors containing isocyanate

Polyamines containing from 0.19 to 20.3 wt % primary amino groups are produced by hydrolyzing in a single stage an isocyanate with an excess of water, a relatively weak basic compound and a water-miscible polar solvent at a temperature from 50.degree. to 165.degree. C. The hydrolysis is conducted in a manner such that the reactants are substantially homogeneous during the reaction. The isocyanate should have an NCO-content of from 0.5 to 40 wt %. The weakly basic compound may be a carbonate or hydrogen carbonate of an alkali metal or an alkali or alkaline earth salt of a monocarboxylic or polycarboxylic acid or mixtures of such materials. The polyamines produced by this process are particularly useful in the production of polyurethanes.

Single-stage process for the production of polyamines and polyamines

The invention relates to a simplified, economic process for the production of polyamines by the alkaline hydrolysis of compounds containing terminal aromatic and/or aliphatic isocyanate groups (including modified isocyanates or NCO-prepolymers and semi-prepolymers with NCO-contents of from 0.5 to 40% by weight), with strong aqueous bases, direct isolation of the polyamines from the carbamate stage being possible by thermal carbamate decomposition and/or solvent extraction. The invention also relates to the use of the aromatic and/or aliphatic polyamines containing primary NH.sub.2 -groups obtainable by the process according to the invention for the production of polyurethanes, such as optionally cellular polyurethane plastics and polyurethane foams.

Polyamines, a process for the production of polyamines and their use in

Polyether-based urethane-group-containing polyamines containing polymers and/or copolymers of unsaturated monomers and, optionally, urea and/or biuret and/or allophanate groups are produced by (a) reacting an NCO-prepolymer in aqueous alkaline solution at 0.degree. to 40.degree. C. to form a carbamate; (b) converting this carbamate to an amine by adding an ion exchanger to the reaction mixture; and (c) separating the polyamine from the reaction mixture. The NCO-prepolymers used as starting materials are prepolymers of (i) polyalkylene ether polyols having a molecular weight of from 1,000 to 10,000 containing from 1 to 60 wt. % of graft (co)polymers of unsaturated monomers; and (ii) excess molar quantities of organic polyisocyanate; and optionally, (iii) a low molecular weight chain-extending agent. The product polyamines have a molecular weight of from 1,000 to 10,000 and contain from 0.65 to 59.3 wt. % graft (co)polymer and from 0.11 to 2.9 wt. % terminal NH.sub.2 groups attached to the ethers by urethane groups in the polyisocyanate. The product polyamines are particularly useful in the production of polyurethanes.

Polymer-containing polyether polyamines and a process for the production

Diisocyanates corresponding to the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 (an isocyanate-containing radical) are as defined herein are made by several processes. These diisocyanates may be made by phosgenating the diamine in which the diisocyanate is based. They may also be produced by treating the bis-urethane of the tertiary alcohol corresponding to the diisocyanate with phosgene. Such diisocyanates may also be made by treating a specific type of bis-urea with hydrogen chloride. The diisocyanates corresponding to the above-given formula are particularly useful in the production of polyurethanes having good flame-proof and mechanical properties.

Aromatic diisocyanates containing N,N-disubstituted sulfonamide groups

Isocyanatoaryl sulphochlorides corresponding to the following general formula: ##STR1## wherein R represents hydrogen, a sulphochloride group (SO.sub.2 Cl) or a sulphonic acid group (SO.sub.3 H), are produced by reacting 2,4-diisocyanatotoluene, optionally as mixtures with up to 35% by weight of 2,6-diisocyanatotoluene, with from 0.2 to 2 mols, per mol of starting diisocyanate, of sulphur trioxide or chlorosulphonic acid and from 0.3 to 20 mols, per mol of starting diisocyanate, of an inorganic acid chloride, either successively or simultaneously, at a temperature of from 0.degree. to 160.degree. C. and hydrogen chloride being removed.

Isocyanatoaryl sulphochlorides

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Leverkusen, Germany

Dieter Dieterich