Patent ID: 6515068
Filing Date: 2003-02-04
Classification: C08G,C09D

Abstract:
A process for producing a water-dilutable binder, having hydroxyl groups and after an addition of a liquid organic polyisocyanate component with free NCO-groups in an amount which corresponds to a proportion of NCO/OH of 0.8:1 to 3:1, which is ready to be used as an organic lacquer coating agent and which after being applied to a substrate hardens into a hard film due to crosslinking reactions, consisting essentially of the following steps:a) concentrating a binder which consists of a non-water-soluble, carboxylate and sulfonate free polyester resin and/or polyacrylate resin with a content of hydroxyl groups of 2.5 to 8% by weight OH and an organic solvent to a content of solids of 80 to 90% by weight, the balance being the organic solvent to form a solvent-containing polyester and/or polyacrylate resin; b) adding to the concentrate produced in step a) an emulsifier in an amount of 0.1 to 10% by weight of the solvent-containing polyester and/or polyacrylate resin; and c) subsequently to step (b), blending water with the solvent-containing polyester and/or polyacrylate resin to create the water-dilutable binder as a storage-stable emulsion, capable of blending with the polyisocyanate component with free NCO groups prior to use.