Polyurethane resins, process for producing the same, and uses thereof

摘要

The improved polyurethane resin has a number average molecular weight of 2,000 - 200,000 and is prepared by reacting an organic diisocyanate compound, a polymer diol compound, a chain extender and a terminator. It is characterized by having at least one group selected from hydrazine groups, hydrazide groups and semicarbazide groups in the molecule. The polyurethane resin can be produced using a chain extender and/or a terminator that have at least one hydrazine group or hydrazide group. This polyurethane resin can be dispersed in water in the presence of an emulsifier or by first introducing free carboxyl groups into the molecule of the resin and then dissolving or dispersing it in an aqueous alkali solution or by first introducing tertiary amino groups into the molecule of the resin and then dissolving or dispersing it in an aqueous acid solution. The water-based polyurethane resin can be used either as a binder for water-based printing inks or as a water-based laminating adhesive. The water-based printing ink and/or the water-based laminating adhesive of the present invention can be used for laminates producing.