Bayer Aktiengesellschaft

Manfred Dollhausen

Rudolf Hombach

Gerhard Hohmann

Horst Muller-Albrecht

Helmut Reiff

Walter Meckel

Artur Reischl

Josef Pedain

Rolf Dhein

Hanns P Muller

Rolf-Volker Meyer

Dieter Dieterich

Gerhard Grogler

Hans Rudolph

Richard Kopp

Heinrich Hess

Hermann Perrey

Josef Sanders

Wolfgang Henning

Eberhard Konig

Bernd Quiring

Roland Richter

Peter R Muller

Wolfgang Wenzel

Hans-Albrecht Freitag

Geza Avar

Dimitrios Kerimis

Hans-Jurgen Muller

Karl-Friedrich Neuhaus

Eugen Velker

Joachim Zirner

Jochen Wulff

Winfried Behr

This invention relates to new, substantially linear polyester polyurethanes containing hydroxyl end groups, based on selected starting materials, and their use as adhesives or for the production of adhesives.

Polyester polyurethanes containing hydroxyl end groups and their use as

An adhesive consisting substantially of an aqueous solution or dispersion of a polyurethane containing chemically incorporated carboxylate and/or sulphonate groups is prepared from a mixture of at least two (cyclo)-aliphatic diisocyanate and selected polyester diols based on (i) adipic acid and (ii) tetramethylenediol, hexamethylenediol or mixtures of these diols. The use of such aqueous solutions for the formation of bonds on any substrates, in particular on leather, plastics, rubber materials and/or polyvinyl chloride containing plasticizer, with the same material or with other materials is disclosed.

Adhesive and use of the adhesive for the formation of bonds

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 relates to polyisocyanate compositions containing reversibly blocked catalysts for the isocyanate addition reaction, characterized in that they contain

Polyisocyanate compositions containing reversibly blocked catalysts and

The present invention is directed to a polyisocyanate preparation dispersible in water and having an average NCO functionality of about 2.0 to 3.5 which contains

Polyisocyanate preparation dispersible in water and their use as an

The present invention relates to the use of thermosetting polyurethane urea reactive adhesive compositions which are stable at ambient temperature but rapidly set at higher temperatures, wherein the adhesive comprises stabilized finely-divided polyisocyanates of retarded reactivity of which 0.1 to 25% of the NCO-groups are surface-modified and higher and/or lower molecular polyamines (optionally with polyols as additional reactive components). An important feature of these thermosetting reactive adhesive compositions is their capacity for storage at ambient temperature and their spontaneous increase in viscosity at relatively low heating temperatures which prevents the adhesive from running off during the heating period when applied to vertical surfaces.

Adhesive joining of surfaces using thermosetting polyurethane urea

Compositions which are storage stable at room temperature are made from an organic polyisocyanate, a compound containing at least two isocyanate-reactive groups and a latent catalyst. The latent catalyst is formed from an amine and an alkylating ester of an acid of phosphorus. These compositions react to form isocyanate polyaddition products when exposed to a temperature of 60.degree. C. or higher. These compositions are useful in the production of adhesives, foamed and non-foamed plastics and coatings.

Latent catalysts for the isocyanate polyaddition reaction

A film is bonded to a substrate by applying a layer of adhesive to the film to be bonded, contacting the film with a substrate and subjecting the adhesive to high energy radiation either before, during or after the film and substrate are contacted. The adhesive layer is from 0.5 to 20 .mu.m thick. The adhesive employed is a mixture of at least one polyisocyanate and at least one compound containing both a (meth)acryloyl group and a hydroxyl group in which the equivalent ratio of hydroxyl to isocyanate groups is from 0.8 to 1 to 1.3 to 1. The substrate to which the film is to be bonded may also be a film. Composites formed in accordance with the present invention are characterized by high initial bond strengths.

Process for bonding films

The invention relates to aqueous adhesives which are based on water-dispersible polymers and which contain water-dispersible polyisocyanate preparations having an average NCO-functionality of at least 2.2, which, in addition to an aromatic polyisocyanate or a mixture of aromatic polyisocyanates, contain a quantity of emulsifier sufficient to guarantee the dispersibility of the polyisocyanates, as additives capable of improving the bonding properties of these adhesives.

Aqueous adhesives containing water-dispersible polyisocyanate

This invention relates to a mixture which is stable in storage in the absence of moisture and comprises the following:

Mixtures of NCO prepolymers containing tertiary nitrogen atoms and the

Ester-modified polyamides containing of from 50 to 80% by weight of --HN--(CH.sub.2).sub.5 --CO units are obtained by reaction of .gamma.-caprolactam and mixtures of dicarboxylic acids, primary diamines and polyalkylene glycols and are suitable inter alia as hot melt adhesives and for the elastification of thermoplastic materials.

Ester-modified polyamides

The instant invention is directed to a process for the production of isocyanate polyisocyanates containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of isocyanurate-free diisocyanate. The process comprises catalytically trimerizing the organic diisocyanates free from isocyanurate groups and terminating the trimerization reaction by deactivation of the catalyst after 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized. The unreacted isocyanurate-free diisocyanate is then distilled off in the presence of from 1 to 30%, by weight, based on the end product obtained as distillation residue, of an inert liquid distillation aid which boils at a temperature at least 50.degree. C. above the boiling point of the isocyanurate-free diisocyanate. The invention is also directed to the products produced by this process.

Process for the production of isocyanurate polyisocyanates, and products

The instant invention is directed to a process for the preparation of dihydroxypolyurethanes containing carboxyl groups and chemically fixed ionic groups, comprising reacting

Process for the preparation of dihydroxypolyurethanes and the use

The instant invention is directed to a method for bonding one or more substrates by applying adhesives comprising organic polyisocyanates and compounds containing isocyanate-reactive hydrogen atoms which react to form polyurethanes, or moisture-hardening reaction products containing free isocyanate groups or excess quantities of polyisocyanates and compounds containing isocyanate-reactive hydrogen atoms, the improvement wherein said compounds containing isocyanate-reactive hydrogen atoms are dispersions of polymers in organic polyhydroxyl compounds.

Method for making bonds

Storable polychloroprene adhesives can be produced by polymerizing chloroprene in a manner known per se in the presence of a dialkylxanthogen disulphide reacting 50 to 90% of the monomer and dissolving the polymer thus obtained in an organic solvent to obtain viscosities in the range of 10 to 100 poises.

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Odenthal, Germany

Manfred Dollhausen