The present disclosure relates to an aqueous dispersion containing at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate. The melting temperature of the semicrystalline polyurethane-polyurea polymer is at least 55 C. The disclosure also relates to a process for preparing the aqueous dispersion, the use of the aqueous dispersion for producing coated substrates or adhesive films, flat or three-dimensional substrates coated with the aqueous dispersion, a substrate coated with at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate, an adhesive film including at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate, and a dried adhesive film obtained from such an aqueous dispersion.

The present disclosure relates to an aqueous dispersion containing at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate. The melting temperature of the semicrystalline polyurethane-polyurea polymer is at least 55 C. The disclosure also relates to a process for preparing the aqueous dispersion, the use of the aqueous dispersion for producing coated substrates or adhesive films, flat or three-dimensional substrates coated with the aqueous dispersion, a substrate coated with at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate, an adhesive film including at least one semicrystalline polyurethane-polyurea polymer and at least one surface-deactivated polyisocyanate, and a dried adhesive film obtained from such an aqueous dispersion.

An environmentally-friendly epoxy tannin resin based polyurea adhesive and its preparation method are provided. The method includes preparing the environmentally-friendly water-resistant tannin-based wood adhesive by graft copolymerization of epoxy tannin, which is obtained by epoxidation of tannin using epoxy chloropropane, with triethylene tetramine and subsequent deamination reaction of them with urea.

Disclosed is a method for improving interfacial adhesion of an adhesive to unprimed substrates and an improved adhesive composition, involving admixing an adhesive with an adhesive modifier, where the modifier is at least partially soluble in the at least one adhesive and includes either a non-aromatic polyol or a molecule having at least one ortho-hydroxyl substitution on a benzene ring.

Disclosed is a method for improving interfacial adhesion of an adhesive to unprimed substrates and an improved adhesive composition, involving admixing an adhesive with an adhesive modifier, where the modifier is at least partially soluble in the at least one adhesive and includes either a non-aromatic polyol or a molecule having at least one ortho-hydroxyl substitution on a benzene ring.

The invention relates to a multilayer composite, containing a first polymeric layer which on a side is coated with a printing ink containing a polyurethane as binder, and a second layer which with a polyurethane dispersion as adhesive is joined at least partly with the side of the first polymeric layer which is coated with the printing ink containing a polyurethane as binder.