Bayer Aktiengesellschaft

Bayer Materialscience Ag

Gerhard Klein

Dieter Arlt

Jens Winkel

Josef Pedain

Reinhard Halpaap

Carlhans Suling

Helmut-Martin Meier

Rolf Dhein

Hans-Joachim Kreuder

Werner Kloker

Wolfgang Fischer

Wolfgang Podszun

Hartmut Nefzger

Jan Mazanek

Manfred Dietrich

Jurgen Reiners

Wilfried Kniege

Klaus Konig

Hanns P Muller

Manfred Schmidt

Rudolf Braden

Walter Schafer

Manfred Bock

Bruno Bomer

Jurgen Schwindt

Roland Richter

Jens Krause

Erika Bauer

Klaus K Onig

Erhard Michels

James-Michael Barnes

Robert Schmitz-Josten

Rudoph Hombach

Rudolph Hombach

Ulrich Boddenberg

Karl-Roland Jerg

J Urgen Schwindt

The present invention relates to polyester polyols with low functionality and a process for their production, to prepolymers prepared from these polyester polyols and a process for their production, and to polyurethanes prepared from these polyester polyols and/or from these prepolymers, and to processes for their production. These polyester polyols are produced in a two-step process. In the second step of this two-step process, one or more cyclic ester monomers is reacted with one or more polyester polyols at low temperatures.

Polyester polyols, a process for the production thereof and the use thereof

The present invention relates to a process for cleaning multi-product production plants for polyester polyols with a cleaning polyol. The cleaning polyol can be used as a raw material in the production of further polyols.

Process for cleaning production plants for polyester polyols

The present invention relates to a process for the preparation of polyurethanes suitable for use as thickeners for aqueous compositions by reacting at an NCO/OH equivalent ratio of 0.9:1 to 1.2:1

Polyurethane-based thickeners for aqueous compositions

Water soluble or water dispersible polyurethane, which are suitable as thickeners for aqueous systems and prepared from a selected alcohol component a) based on a hydrophilic/hydrophobic mixture of alcohols and an isocyanate component b), and to their use for thickening aqueous systems.

Polyurethane thickeners and their use for thickening aqueous systems

The new (meth)acrylic acid derivatives containing urethane groups can be prepared by reaction of a (meth)acrylic acid ester with diisocyanates and subsequent reaction with polyols. The compounds can be used for dental materials.

(Meth)acylic acid derivatives containing urethane groups

The present invention relates to a powder lacquer containing a mixture of

Powder lacquer and its use for coating heat-resistant substrates

(Methyl)acrylic acid derivatives containing urethane groups

The present invention is directed to isocyanato isocyanurates prepared from diisocyanates which contain a sterically unhindered isocyanate group bound to a primary aliphatic carbon atom and a sterically hindered isocyanate group which is bound to a tertiary carbon atom forming part of a cycloaliphatic ring system, said diisocyanate having an NCO content of about 20 to 50% by weight. The present invention is further directed to a process for preparing these isocyanato isocyanurates by catalytic trimerization and the use of the isocyanato isocyanurates in a process for the production of polyisocyanate polyaddition products, preferably two-component polyurethane stoving lacquers.

Isocyanurate group-containing polyisocyanates

The present invention relates to diisocyanates having an isocyanate content of from about 20 to 50% by weight, optionally in the form of isomeric mixtures, characterized in that, in addition to containing a sterically unhindered isocyanate group attached to a primary aliphatic carbon atom, they contain a sterically hindered isocyanate group attached to a tertiary carbon atom which forms part of a cycloaliphatic ring system. The invention also relates to the use of the new diisocyanates, optionally blocked with blocking agents for isocyanate groups, as isocyanate component for the preparation of polyurethanes suitable for use as coatings.

Diisocyanates and their use for the preparation of polyurethanes

The present invention is directed to a process for the production of prepolymers containing free tertiary isocyanate groups by reacting

Process for the production of prepolymers containing isocyanate groups,

The present invention is directed to a process for the production of polyisocyanates containing isocyanurate groups by trimerizing a mixture of aliphatic-cycloaliphatic diisocyanates having a sterically unhindered isocyanate group bound to a primary aliphatic carbon atom and a sterically hindered isocyanate group bound to a tertiary carbon atom which forms a part of a cycloaliphatic ring system and 1,6-diisocyanatohexane. The present invention is also directed to the polyisocyanates containing isocyanurate groups produced according to this process and to their use, optionally in blocked form, as an isocyanate component in the production of polyisocyanate polyaddition products, preferably polyurethane lacquers.

Tertiary polyisocyanate derivatives

(Meth)-acrylic acid derivatives of tricyclodecanes of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and denote hydrogen, lower alkyl, lower alkoxy, halogen or trifluoromethyl and R.sup.3 and R.sup.4 are identical or different and represent the group ##STR2## wherein X denotes a divalent bridge member from the group ##STR3## and Y denotes a divalent bridge member from the group ##STR4## and wherein R.sup.5 represents hydrogen or methyl and R.sup.6 represents lower alkyl or phenyl, have been found. Dental compositions in which the present (meth)-acrylic acid derivatives of tricyclodecanes are used, exhibit considerably less polymerization shrinkage.

(Meth)-acrylic acid derivatives of tricyclodecanes and their use

This invention relates to radically hardening adhesives, which contain polymerisable isocyanates and which are distinguished by high adhesive capacity on plastics materials.

Adhesives with a high level of adhesion on plastics materials

The invention relates to the use of novel N,N-disubstituted arylamines containing polymerizable groups as hardening accelerators for polymerizable compositions based on unsaturated polyester resins, in particular for trowelling and water compositions.

Polymerizable compositions and the use of arylamines as hardening

Compounds of the formula ##STR1## are suitable as curing accelerators which can be incorporated into ethylenically unsaturated, cold-curable resins.

Growing community of inventors

Monheim, Germany

Gerhard Klein