Bayer Aktiengesellschaft

Heinrich Heine

Hanns P Muller

Walter Uerdingen

Peter Kohler

Rolf Kubens

Dieter Freitag

Dimitrios Kerimis

Hans-Peter Biermann

Hans-Dieter Jakob

Klaus Prater

Peter Ringe

Hans-Josef Buysch

Hans-Dieter Block

Peter Woditsch

Artur Botta

Helmut Steinberger

Bert Brassat

Frank Gerald Kleiner

Bernd Wahle

Joachim Franke

Bernhard Hess

Gerhard Franz

Roland Gipp

Peter Mues

Rolf Naumann

Gerhard Winter

Wolfgang Rambold

Lutz Leitner

Karl Brandle

Lothar Schonfelder

Volker Wilhelm

Robert Endres

Dieter Rade

Manfred Blazejak

Hans Kyri

Dieter Messer

Gerhard Trenczek

Martin Muller

Theodor Bohmann

Bruno Raederscheidt

The present invention directed to an at least substantially pore-free polyurethane prepared by reacting at least one polyisocyanate and a component containing a partial carboxylic acid ester which is the reaction product of a carboxylic acid and an at least trihydric alcohol in quantities such that at least one of the hydroxyl groups of said alcohol is not esterified.

At least substantially pore-free polyurethane molding compounds

This invention relates to storage stable resin reaction mixtures obtained by mixing at least one organic polyisocyanate, at least one organic compound containing at least two epoxide groups, at least one alkylating agent that inhibits the reaction of the polyisocyanate and epoxide components, and optional auxiliary agents and additives. The present invention further relates to a process for the preparation of such reaction mixtures and to their use.

Storage stable resin reaction mixtures, and the preparation and use

The invention relates to a process for the production of sulphonic acid ester group-containing polyhydroxyl compounds having an average hydroxyl functionality of from 1.5 to 4, comprising reacting

Polyhydroxyl compounds containing a sulfonic acid ester group

Molded articles are produced in a two-stage process. In the first stage, an organic polyisocyanate is reacted with an organic compound containing at least two epoxide groups (NCO: epoxide equivalent ratio of 1.2:1 to 500:1) in the presence of a tertiary amine catalyst. This reaction is stopped when no more than 65% of the isocyanate groups have reacted by adding an alkylating sulfonic acid alkyl ester of methyl iodide and/or of dimethyl sulfate in an amount equivalent to the amount of tertiary amine catalyst present. A latent catalyst capable of being activated by heat is subsequently added to the intermediate product and the resultant mixture is heated in a mold to complete the crosslinking of the intermediate product and to form the molded article.

Two stage process for the production of molded articles

The invention relates to new, liquid-crystalline diglycidyle compounds of optionally ring-substituted 4-hydroxyphenyl 4-hydroxybenzoates, a synthesis of p-epoxypropoxy-phenyl p-epoxy-propoxybenzoate, furthermore epoxy resin mixtures containing the new diglycidyle compounds, and the use of the new diglycidyl compounds and the epoxy resin mixtures thereof in curable mixtures.

Liquid-crystalline diglycidyl compounds, the preparation of these, and

A thermosetting reactive resin mixture is made from an organic polyisocyanate, a polyepoxide and a heat activatable catalyst. The catalyst is a tertiary or quaternary ammonium salt of an alkylating or acidic ester of an organic phosphonic acid or of phosphoric acid. The polyisocyanate and polyepoxide are used in quantities such that the equivalent ratio of isocyanate groups to epoxide groups is from 1.2:1 to 70:1. These mixtures may be heated to produce plastics having excellent heat resistance, moisture and abrasion resistance, low dielectric losses and excellent molding properties.

Thermosetting reactive resin mixtures and a process for the production

The invention relates to a novel process for the production of duromeric aliphatic polycarbonates from cyclic aliphatic carbonic esters by ring-opening polymerization.

Process for the production of duromeric aliphatic polycarbonates

The invention relates to epxoy resins obtained by reaction of epichlorohydrin with selected mixtures of phenols for the production of thermosetting and cold-hardening moldings, coating compositions and adhesive compositions.

Special epoxy resins

This invention relates to heat-hardenable epoxide resin mixtures of at least one 1,2-polyepoxide having more than one 1,2-epoxide group per molecule, at least one cyclic carboxylic acid anhydride and at least one ammonium phosphonate or ammonium phosphate as a hardening catalyst, as well as further optional auxiliaries.

Heat-hardenable epoxide resin mixtures

In the production of an .alpha.-iron oxide pigment by the hydrothermal treatment of a trivalent iron-containing solution or suspension, the improvement which comprises adding to the solution or suspension prior to the hydrothermal treatment active .alpha.-iron oxide seeds with lamellar or disc-like crystal form and a specific surface of at least 10 m.sup.2 /g, whereby the resulting pigment is lamellar with an Fe.sub.2 O.sub.3 content of at least 88%, an average particle diameter of from 0.5 to 20 .mu.m, an average ratio of diameter to thickness of from 20 to 100, and an almost normally distributed particle size distribution, the relative standard deviation of which, based on the average value of the normal distribution, is less than 0.3. The product has superior coloring properties and is used as a precursor compound for the production of lamellar magnetic pigments with superior magnetic properties.

Lamellar iron oxide pigments, a process for the production thereof and

Yellow to orange-red bismuth oxide-chromium oxide mixed phase pigments having a specific surface from about 1 to 10 m.sup.2 /g and the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein x is from about 0.05 to 0.5 are produced by mixing the appropriate quantities of finely disperse bismuth-(III)-- and chromium-III-- or chromium-(VI)-compounds, calcining the mixture in air at a temperature from about 500.degree. to 800.degree. C. and subsequently grinding. The products are suitable for pigmenting lacquers, plastics and dispersion dyes.

Mixed phases having the composition Bi.sub.2-x Cr.sub.x O.sub.3

This invention relates to a mixture of from 60 to 95% by weight of a diglycidyl ester of hexahydrophthalic acids and from 5 to 40% by weight of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate. In combination with conventional polycarboxylic acid anhydrides as hardeners, this mixture is used for the production of molded bodies with excellent weathering resistance, good electrical properties and surprisingly good mechanical properties.

Mixtures of special cycloaliphatic 1,2-diepoxides and their use

A bismuth oxide/chromium oxide mixed phase pigment having the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein 0.05.times.0.5 and a specification surface of about 1.0 to 10 m.sup.2 /g is produced by mixing metallic bismuth intensively with a chromium (III) and/or chromium (VI) compound, calcining the homogeneous mixture in an oxidizing atmosphere at a temperature of about 500.degree. to 800.degree. C., and crushing the product to pigment size.

Production of bismuth oxide/chromium oxide mixed phase pigments

Yellow to orange-red bismuth oxide-chromium oxide mixed phase pigments having a specific surface from about 1 to 10 m.sup.2 /g and the composition Bi.sub.2-x Cr.sub.x O.sub.3 wherein x is from about 0.05 to 0.5 are produced by mixing the appropriate quantities of finely disperse bismuth-(III)- and chromium-(III)- or chromium-(VI)-compounds, calcining the mixture in air at a temperature from about 500.degree. to 800.degree. C. and subsequently grinding. The products are suitable for pigmenting lacquers, plastics and dispersion dyes.

Mixed phases having the composition Bi.sub.2-x Cr.sub.x O.sub.3 and a

Iron oxide particles containing at least 5% by weight of iron (II) content calculated as FeO are stabilized against atmospheric oxidation by a coating of at least one compound containing boron and those particles are useful as coloring pigments and magnetic particles in magnetic recording media.

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Leverkusen, Germany

Heinrich Heine