Bayer Aktiengesellschaft

Horst Muller-Albrecht

Manfred Dollhausen

Walter Meckel

Heinrich Konigshofen

Manfred Beck

Hermann Perrey

Otto Ganster

Bernd Quiring

Rudolf Hombach

Gunter Arend

Knut Panskus

Karl-Friedrich Neuhaus

Eugen Velker

Jochen Wulff

Jurgen Kramer

The invention relates to crosslinking isocyanates for polymeric adhesives containing a mixture of triisocyanatotriphenyl methane and trimerization products of 2,4-tolylene diisocyanate containing at least 50% triisocyanatomonoisocyanurate and less than 1% free tolylene diisocyanate.

Crosslinking agents for polymeric adhesives

The present invention is directed to a mixture which can be used as an adhesive. The mixture broadly contains 1) a hydroxy group containing polyurethane, and 2) a polycarbonate and/or a polycaprolactone.

Polyurethane mixtures and the use thereof as adhesives

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

Adhesive mixture

The invention relates to a solvent-free hotmelt adhesive based on polyester polyurethanes which are suitable for the production of composite structures and, in particular, laminated parts for the interior finishing of motor vehicles. The hotmelt adhesive is based on polyester polyurethanes which are obtained by reacting organic polyester polyols and low molecular weight diols as chain-extending agents and which are modified by the incorporation of carboxyl and sulfonate groups. In addition to these modified polyester polyurethanes, the hotmelt adhesive may also contain unmodified polyester polyurethanes and crosslinking agents. The hotmelt adhesive is preferably in the form of a film or an in situ coating on a substrate. The hotmelt adhesive is produced by known processes of the type normally used for producing the known, unmodified polyester polyurethanes.

Solvent-free hotmelt adhesive comprising a polyester polyurethane

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 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 relates to compositions comprising certain copolymers and/or graft polymers of styrene or .alpha.-methyl styrene in combination with certain polyurethanes useful as adhesives.

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Cologne, Germany

Horst Muller-Albrecht