Covestro Intellectual Property Gmbh & Co. Kg

Covestro Deutschland Ag

Robert Liberati

Dirk Achten

Jan Weikard

Harald Kraus

Peter Kueker

Martin Melchiors

Christoph Thiebes

Wolfgang Arndt

Sebastian Doerr

The invention relates to the use of an aqueous dispersion containing at least one polyurethane-polyurea polymer formed from (a) at least one difunctional polyester polyol having a number-average molecular weight of 400 to 5000 g/mol, (b) at least one difunctional polyol component having a number-average molecular weight of 762 to 399 g/mol, c) at least one diisocyanate and (d) at least one chain extender optionally having at least one ionic group, for the bonding of at least two substrates by application of the aqueous dispersion to at least one of the substrates to be bonded, subsequent drying of the dispersion present on the at least one substrate in order to obtain at least one adhesive layer, and contacting of the at least one adhesive layer with a further substrate or with an adhesive layer present on a further substrate at a pressure of from 0.1 to 5 bar(a) and a temperature of less than 40° C., wherein the polyurethane-polyurea polymer after the drying has a glass transition temperature Tg of from −65 to 10° C. and a melting point of from 40 to 80° C., to a corresponding process for joining at least two substrates, and to an adhesive composite obtained in this way and comprising at least two substrates and an adhesive layer present between every two substrates.

Use of dispersion adhesives for foam bonding

The invention relates to formulations of aqueous dispersion adhesives on the basis of aqueous polyurethane or polyurethane-urea dispersions and the use of the adhesive formulations for bonding foam substrates according to the spray coagulation method.

Dispersion adhesives

The invention relates to the use of aqueous dispersion adhesives on the basis of a mixture of aqueous polyurethane or polyurethane-urea dispersions for bonding foam substrates according to the spray coagulation method.

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Hürth-Efferen, Germany

Robert Liberati