Bayer Aktiengesellschaft

Eduard Hansel

Walter Meckel

Klaus Konig

Otto Ganster

Gunter Arend

Gerhard Grogler

Richard Kopp

Heinrich Hess

Horst Stepanski

Rolf-Volker Meyer

Thomas Scholl

Hans-Detlef Heinz

Gu Arend

The present invention relates to solvent-free two-component polyurethane adhesive systems with high initial strengths and low levels of migration derived from a select reactants comprising a hydroxyl polyester and an isocyanate containing prepolymer.

Solvent-free, two-component polyurethane adhesive systems

The invention relates to a process for bonding surfaces with isocyanate-containing prepolymers having an isocyanate group content of less than 1.8% by weight, based on the prepolymer, and an average molecular weight MW.sub.n of at least 4,500 in which (a) the prepolymers are prepared by the reaction of (i) polyester diols prepared from dodecanedioic acid and even-numbered alkane diols containing at least 6 carbon atoms and (ii) diisocyanates; (b) the prepolymer is applied as a hotmelt adhesive at a temperature of 80 to 160.degree. C. by spin-spraying onto at least one surface to be bonded; and (c) the treated surface is brought into intimate contact with a second surface to be bonded.

Hotmelt bonding process

The present invention relates to aqueous polyurethane dispersions based on

Aqueous polyurethane dispersions and their use as laminating adhesives

This invention relates to crystalline, isocyanate group-containign hot melt adhesives based on

Hot melt adhesives

Disclosed herein is a transparent adhesive containing isocyanate groups based on at least one polyol and at least one polyisocyanate, characterized in that the adhesive contains urea groups.

Adhesives based on polyols and polyisocyanates

The present invention is directed to a polyurethane reactive adhesive compound comprising:

Polyurethane reactive adhesive compounds containing finely dispersed

The present invention is directed to a polyurethane system containing isocyanate groups prepared by reacting

Rapidly crystallizing polyurethane systems

The present invention relates to heat-curable reaction systems prepared by mixing (a) solid polyisocyanates (optionally deactivated) having melting points above 80.degree. C., (b) OH- and/or NH.sub.2 -terminated polyoxyalkylene polyethers that have molecular weights of 400 to 10,000 and are liquid at room temperature, (c) solid OH- and/or NH.sub.2 -terminated polyesters that have molecular weights of 400 to 20,000 and are solid at room temperature, and which are thoroughly distributed throughout the mixture but are not homogeneously miscible with the polyether, (d) optional low molecular weight chain-extending agents that contain OH and/or NH.sub.2 groups and have a molecular weight of 62 to 399, and (e) optional catalysts and other auxiliaries. The invention further relates to a method for preparing elastomers, coating compounds, sealing compounds, or adhesives by heat-curing the heat-curable systems.

Heat-curing polyether-polyester-polyurethane ureas

This invention relates to modified polyetheramide hotmelt adhesives showing reduced melt viscosity and, optionally, better adhesive properties and to their use as ingredients for hotmelt adhesives.

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Wuppertal, Germany

Eduard Hansel