Aqueous adhesives containing water-dispersible polyisocyanate preparations
AssigneeBayer Aktiengesellschaft
InventorsRudolf Hombach, Helmut Reiff, Wolfgang Wenzel, Manfred Dollhausen
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Abstract
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.
Claims6
Aqueous adhesives comprising an aqueous polymer dispersion and a water-dispersible polyisocyanate having an average NCO-functionality of at least 2.2 and comprising
- (a) an aromatic polyisocyanate having an NCO-functionality of at least 3 or a mixture of aromatic polyisocyanates having an average NCO-functionality of at least 2.2 and
- (b) an emulsifier produced by reacting aromatic polyisocyanates with hydrophilic compounds containing isocyanate-reactive groups in an NCO/OH-equivalent ratio of at least 1:1, in a quantity sufficient to guarantee the dispersibility of the polyisocyanates.
Dependencies are inferred from the claim text.