Bayer Aktiengesellschaft

Agfa-gevaert Ag

Bernd Quiring

Kuno Wagner

Wilhelm Goyert

Georg Niederdellmann

Hans Wagner

Hanns P Muller

Wolfgang Oberkirch

Hartmut Nefzger

Walter Meckel

Wilhelm Thoma

Alfred Eitel

Wolfgang Grimm

Ernst Meisert

Christian Lindner

Dieter Wittmann

Ulrich R Grigo

Hans-Jurgen Kress

Helmut Reiff

Werner Nouvertne

Horst Peters

Artur Reischl

Jochen Schoeps

Joachim Konig

Wolfgang Henning

Peter Tacke

Manfred Dollhausen

Wolfgang Wenzel

Eduard Mayer

Burkhard Nippe

Horst Muller-Albrecht

Heinrich Kober

Hans J Scholl

Robert Kohler

Gunter Oertel

Claus Rathjen

Jochen Wulff

Franz-Josef Gielen

Karlchristian Schilffarth

Hans D Golitz, Deceased

Isocyanates are polymerized in a simple manner by polymerizing aliphatic and/or aromatic isocyanates in the presence of metallocenes at temperatures from 20.degree. to 220.degree. C., optionally subject to increased or reduced pressure and optionally in the presence of an inert organic solvent, the metallocene being used in an amount of 5 to 50,000 ppm relative to the amount of isocyanates used.

Process for polymerizing isocyanates

Polyols are conditioned and stabilized by mixing them at 0 to 150.degree. C. with from about 0.0001 to about 1% by weight, based on the quantity of polyol, of a silylated acid corresponding to the formula:

Process for conditioning and stabilizing polyols

The invention relates to a process for stabilizing ester-containing plastics against degradation by heat and/or hydrolysis by the incorporation of sterically hindered isocyanate-terminated carbodiimides. The incorporable carbodiimides produce an excellent anti-aging effect and do not give rise to volatile products, even at very high temperatures.

Process for stabilizing plastics containing ester groups

This invention relates to mixtures of thermoplastic aromatic poly(ester)carbonates with thermoplastic polyurethanes containing special graft polymers and, optionally, suitable additives, to a process for their production and to the use of the mixtures according to the invention for the production of moldings, particularly by injection molding or extrusion.

Mixtures of thermoplastic poly(ester) carbonates with thermoplastic

Thermoplastic molding compositions containing

Polycarbonate moulding composition with improved flow and processiblity

The present invention is directed to a process for the production of matte, non-blocking, thin-walled molded articles, films or tubes from polyurethane elastomers prepared from high molecular weight polyols which contain dispersed polyadducts based on polyisocyanate polyaddition products. The use of these high molecular weight polyols contained dispersed polyadducts allows for the preparation of thin-walled, molded articles which have reduced surface tackiness. The present invention is additionally directed to the molded articles produced by this process and to their use for forming polyurethane foam composites.

Process for the production of matte, non-blocking, thin-walled molded

The present invention relates to a magnetic storage medium consisting of a non-magnetic layer support and, applied thereto, a binder-containing magnetic layer, the binder consisting of from 25 to 100% of a thermoplastic polyurethane substantially free from reactive terminal groups obtained by reacting a linear polyester of at least one dicarboxylic acid containing from 2 to 8 carbon atoms and/or hydroxy carboxylic acid containing from 4 to 6 carbon atoms and at least one glycol containing from 2 to 6 carbon atoms, the polyester having a molecular weight of from 1200 to 6000, at least one diisocyanate and a mixture of at least two glycols containing from 2 to 20 carbon atoms, the molar fraction of the individual components not exceeding 0.8. The polyurethane has a hardness of from 80 to 100 Shore A, a tensile strength of from 30 to 75 MPa and a breaking elongation of from 320 to 520%.

Magnetic storage medium

The invention is directed to a process extruding or melt roll calendering thermoplastic polyurethanes wherein the polyurethanes used are synthesized from p1 (a) one or more relatively high molecular weight substantially linear polyols having molecular weights in the range from 400 to 10,000

Thermoplastic polyurethanes for processing in extruders and/or on

The instant invention is directed to a continuous process for the production of thermoplastic materials, comprising:

Process for the production of thermoplastic synthetic materials

The instant invention is directed to a process for the continuous preparation of polyisocyanates containing uretdione groups comprising dimerizing aromatic polyisocyanates which are free from uretdione groups in the presence of catalysts which accelerate the dimerization of isocyanates, at -30.degree. to 90.degree. C. in a self-cleaning, coolable screw reactor with continuous feeding in of the free polyisocyanate and of the dimerization catalyst, and in the presence of from 3 to 90% by weight, based on the whole mixture, of an additive containing hydroxyl groups, which additive comprises either (i) a compound within the molecular weight range of from 62 to 10,000 containing at least one hydroxyl group or (ii) a mixture of several compounds having an average molecular weight within the range of from 62 to 10,000 containing at least one bound hydroxyl group, wherein said hydroxyl-containing compound or compounds are added to the reaction mixture before the isocyanate used as starting material solidifies due to the dimerization reaction.

Process for the continuous preparation of polyisocyanates containing

The present invention relates to a process for the preparation of polyurethane ureas from relatively high molecular weight polyols, diisocyanates, water as chain lengthening agent and optionally short chain glycols in a multishaft extruder equipped with kneading elements.

Extrusion process for the preparation of polyurethane ureas

The instant invention is directed to a process for the modification of a thermoplastic polymer comprising:

Process for the production of thermoplastic polymer by introducing

The present disclosure is concerned with a novel transparent polyurethane polyurea which is particularly suitable for lamination to glass and glasslike transparent plastics. The polymer is the reaction product of high molecular weight diols, optionally low molecular weight diols, dihydroxy carboxylic acids, diisocyanates with only aliphatically and cycloaliphatically bound isocyanates and organic diamines having aliphatically and cycloaliphatically bound primary amino groups. It has specified contents of carboxyl groups and urea groups, and it has a minimum shear modulus at both 20.degree. and 60.degree. C. The present disclosure is also concerned with a process for synthesizing such polymers. A preferred method is to react the diisocyanate and hydroxyl bearing compounds to prepare an isocyanate terminated prepolymer and chain extend with the diamine. Also discussed are the production of film from these polymers by extrusion and solution casting, the production of laminates with glass and glasslike plastics and the laminates so produced. The solution cast or extruded films can be laminated to these substrates by the application of heat and pressure.

Novel transparent polyurethane polyurea films for lamination of glazing

The instant invention is directed to a continuous process for the production of thermoplastic polyurethanes by reacting

Process for the production of thermoplastic polyurethane elastomers

Novel transparent polyurethane polyureas for lamination of glazing

Growing community of inventors

Leverkusen, Germany

Bernd Quiring