Reactive polyurethane-hot melt adhesive having a low isocyanate-monomer content

A composition comprising

• a) at least one polyurethane polymer of the formula (I) which is solid at room temperature and has aldimino groups
• in which
• p is an integer 1 or 2 and
• q is an integer 0 or 1,
• with the proviso that p+q=2;
• R1 is either
• a monovalent hydrocarbon radical having 6 to 30 C atoms which optionally has at least one heteroatom;
• or
• is a substituent of the formula (II)
• in which
• R6 is a divalent hydrocarbon radical having 2 to 20 C atoms which optionally has at least one heteroatom;
• and
• R7 is a monovalent hydrocarbon radical having 1 to 20 C atoms;
• R2 and R3 either,
• independently of one another, are each a monovalent hydrocarbon radical having 1 to 12 C atoms;
• or
• together form a divalent hydrocarbon radical having 4 to 20 C atoms, which is part of an optionally substituted carbocyclic ring having 5 to 8, preferably 6, C atoms;
• and in which
• R4 is a divalent hydrocarbon radical having 2 to 12 C atoms which optionally has at least one heteroatom;
• R5 is the radical of a polyurethane polymer D which is solid at room temperature and has isocyanate groups, after removal of (p+q) isocyanate groups;
• X is O, S or N—R8,
• in which
• R8 is either
• a monovalent hydrocarbon radical having 1 to 20 C atoms which optionally has at least one carboxylic acid ester, nitrile, nitro, phosphonic acid ester, sulfone or sulfonic acid ester group
• or
• a substituent of the formula (III)
• b) at least one polyurethane polymer P having isocyanate groups, if q in formula (I) is zero, or if X in formula (I) is N—R8 with R8 as a substituent of the formula (III).