REPULPABLE CELLULOSE-CONTAINING MATERIALS

The invention concerns materials containing cellulose (such as wood) and produced using water-dispersible polyisocyanates which in their turn are produced by the reaction of the following initial components: (a) modified polyisocyanates of formula (I), in which R1 represents an aliphatic hydrocarbon group with 2-18 carbon atoms, a cycloaliphatic hydrocarbon group with 4-15 carbon atoms, an aromatic hydrocarbon group with 6-15 carbon atoms or an araliphatic hydrocarbon group with 8-15 carbon atoms, R2 represents an aliphatic hydrocarbon group, optionally with double bonds, with 10-35 carbon atoms, R3 represents an at least divalent hydrocarbon group, which can also optionally be heterocyclic by incorporation of the ester oxygen or amide nitrogen from X; X represents (i) and/or (ii) and/or (iii) and or (iv), R representing H, C1-C4 alkyl or a component of a ring structure; n is a number not less than 2 and y is not less than 1; (b) unmodified polyisocyanates; (c) optionally ester groups containing polyethylene oxide-polyethylene alcohols; (d) optionally cycloaliphatic and/or aliphatic amines, which may optionally contain ether, ester or amide groups and contain at least one isocyanatereactive functional group and at least one tertiary amino group and/or ammonium group.