Basf Aktiengesellschaft

Basf Wyandotte Corporation

Elastogran Gmbh

Herbert Stutz

Karl H Illers

Helmut Tesch

Walter Heckmann

Heinz-Ulrich Werther

Herbert Haberkorn

Manfred Heym

Heinrich Hartmann

Peter Neumann

Gerhard Hoffmann

Gerhard Heinz

August Lehner

Werner Lenz

Michael Portugall

Ludwig Schuster

Andreas Henne

Helmut Barzynski

Otto Volkert

Dietmar Nissen

August Wigger

Peter Richter

Sabine Kielhorn-Bayer

Wolfgang Eberle

Wolfgang Jarre

Heinz Bollmann

Wolfgang Scholz

Hans-Gert Recker

Thomas Folda

Robert Gehm

Thomas Weber

Gerhard Schaefer

Ernst Schoen

Walter Doerflinger

Lothar Metzinger

Volker Altstaedt

Otmar Zipp

Gunter Eckert

Friedhelm Lehrich

Peter Rieger

Dietrich Sanger

Impact-resistant thermoplastic molding materials

A curable impact modified epoxy resin mixture suitable for producing high performance composites is composed of

Curable impact modified epoxy resin having stabilized multiphase

A curable epoxy resin mixture containing an adduct of an epoxy resin with a bifunctional phenol or a bifunctional aromatic carboxylic acid of the formula ##STR1## where A=SO.sub.2 or CO, Ar is ##STR2## and X is OH or COOH, and an aromatic amine as a curing agent.

Epoxy resin mixtures

A solvent-free curable composition has a long shelf life and consists of

Curable compositions based on epoxy resins

Curable epoxy resins

Aqueous dispersions of crosslinked polyurethane ionomers can be advantageously obtained by a method in which polyurethane prepolymers possessing salt groups and aliphatically and/or cycloaliphatically bonded terminal isocyanate groups, in a water-miscible organic solvent, are mixed with polyfunctional polyisocyanates, the resulting solution is dispersed in water and the organic solvent is evaporated off.

Preparation of crosslinked polyurethane ionomer dispersions

The invention relates to a process for the manufacture of noncellular polyurethane elastomers by reacting 4,4'-diisocyanato-1,2-diphenylethane or diisocyanato-1,2-diphenylethane isomer mixtures with a 4,4'-diisocyanato-1,2-diphenylethane content in excess of 95 percent by weight, higher molecular weight polyhydroxyl compounds and low molecular weight chain extenders optionally in the presence of auxiliaries and additives. The polyurethane elastomers produced in accordance with this invention excel by a greater hardness and improved mechanical properties compared with polyurethane elastomers based on 4,4'-diphenylmethane diisocyanate with otherwise comparable composition.

Process for the preparation of noncellular polyurethane elastomers based

A process for the preparation of moldings, in particular resilient elements, which by virtue of a densified surface zone with substantially closed cells, have only a low water absorption, wherein a mixture comprising:

Production of closed-cell polyurethane moldings having a densified

The invention relates to a method for the preparation of cellular polyurethane elastomers with densities of approximately 250 to 800 grams per liter by reacting 4,4'-diisocyanato-1,2-diphenylethane or a diisocyanato-1,2-diphenylethane isomer mixture with a 4,4'-diisocyanato-1,2-diphenylethane content of more than 95 percent by weight with higher molecular weight polyhydroxyl compounds and water, as well as optionally chain extenders in the presence of auxiliaries and/or additives according to the one-shot or preferably the prepolymer method in closed molds. Compared with products based on 4,4'-diisocyanatodiphenylmethane, the polyurethane elastomer molded parts have improved physical and thermal properties.

Process for the preparation of cellular polyurethane elastomers based on

This invention concerns a process for the manufacture of flexible polyurethane foams from urethane-modified aromatic polyisocyanates having an NCO content of 15 to 30 percent by weight and a viscosity of 100 to 2000 centipoises at 20.degree. C., which are obtained by reaction of a mixture of diphenylmethane diisocyanates and polyphenylene polymethylene polyisocyanates containing 55 to 85 percent by weight of diphenylmethane diisocyanate based on the total weight of the polyisocyanate mixture and a hydroxyl compound with 2 to 4 Zerewitinoff active hydrogen atoms and a molecular weight of 60 to 1500, in an equivalency ratio of NCO groups to active hydrogen atoms of the hydroxyl compound of 2:1 to 60:1, polyols, catalysts, blowing agents, and optionally, chain extenders, auxiliaries, and additives.

Manufacture of flexible foams

Polyurethane-urea elastomers with improved temperature characteristics, in particular improved low temperature properties, good mechanical properties over a large temperature range and excellent resistance to hydrolysis, are obtained by reacting

Polyurethane-urea elastomers and their production

Hard, rigid, non-elastomeric, non-cellular polyurethane compositions manufactured by reacting a liquid hydroxylic polyether having an OH equivalent weight of from 50 to 250, a monofunctional hydroxylic polyether having a molecular weight of from 150 to 10,000 and devoid of further functional groups which react with isocyanates, and an organic polyisocyanate, with or without catalysts, auxiliaries and additives.

Hard, rigid, non-elastomeric polyurethane, compositions

Polyurethane elastomers of improved heat stability are made by a process in which a polyisocyanate is reacted with a polyol of high molecular weight with an OH:NCO ratio of 1:0.66 to 1:0.85, and the resulting adduct is later reacted with an excess of symmetrical diisocyanate and a diol as chain extender.

Process for preparing heat-resistant polyurethane elastomers having no

The invention concerns a process for making heat-resistant polyurethane elastomers from substantially linear polyhydroxyl compounds of high molecular weight, polyisocyanates, chain extenders, and, if desired, catalysts and additives, in which the polyhydroxyl compound is reacted with diisocyanate material in amounts to give an OH:NCO ratio of 1:1.10 to 1:2 and produce an adduct, and the adduct is subsequently reacted with symmetrical aromatic diisocyanate and a diol as chain extender (preferably a linear diol containing 2,4 or 6 carbon atoms) to obtain a crystalline or crystallizable diurethane or polyurethane of good heat resistance.

Fluid photo-crosslinkable composition consisting essentially of a photo-initiator and a mixture of

Fluid photo-crosslinkable compositions for the manufacture of relief

Growing community of inventors

Karlsruhe, Germany

Herbert Stutz