Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Christos Karafilidis

Christian Wamprecht

Christoph Gürtler

Sebastian Dörr

Peter Reichert

Marc Leimenstoll

Burkhard Köhler

Beate Baumbach

Matthias Wintermantel

Sebastian Doerr

Heinz-Werner Lucas

Evelyn Peiffer

Axel Schmidt

Evelyn Pfeiffer

Marc Christian Leimenstoll

Burkhardt Köhler

The present invention relates to reactive preparations, comprising isocyanate-functional polyurethane building blocks, to a method for the production thereof, and to the use thereof as or in adhesives having high initial strength and high mechanical strength.

Hot melts

Polyisocyanate mixtures, their preparation by reacting aromatic polyisocyanate mixtures and nitrogen-containing polyetherol mixtures, and their use as an isocyanate component for the preparation of moisture-curing adhesives, said polyisocyanate mixtures comprising: (A) 15 to 35 wt. % of diphenylmethane diisocyanate with 2 aromatic rings; (3) 10 to 30 wt. % of polymeric diphenylmethane diisocyanate with 3 or more aromatic rings; and (C) 40 to 75 wt. % of an isocyanate-functional polyurethane; wherein the polyisocyanate mixture has an isocyanate content of 12 to 20 wt. %, an isocyanate functionality of &#x3e;2.4, a viscosity of &#x3c;10,000 mPa&#xb7;s at 25&#xb0; C., and a shear rate of 80 l/s.

Polyisocyanate mixtures, processes for preparing the same and uses therefor

The invention relates to novel prepolymers which are accessible from the formamides of oligomeric di- or polyamines (formamide-terminated oligomers) and di- or polyisocyanates.

Prepolymers

Growing community of inventors

Düsseldorf, Germany

Christos Karafilidis