Process for preparing pigment resins for electrophoretic coating compositions

摘要

The invention relates to a process for the preparation of pigment paste resins for cathodically depositable coating compositions, on the basis of obtained from modified or unmodified epoxy resins, epoxy resin-amine adducts which have by partial or complete reaction of the secondary amino groups with formaldehyde oxazolidine, and their introduced by primary-tertiary diamines tertiary amino groups at least 20 mole% is quaternized with an organic acid and a monoglycidyl compound, and which contain a total amount of 80 to 100 millimoles of acid / 100 g of solid resin in the adjusted with water to the processing viscosity partial dissolution.; The products according to the invention also result in different types of composition of the pigments pigment pastes used that satisfy the various requirements in practice, and both in concentrated have a practical stability as well in diluted form, are easy to process due to their rheology, proper film formation in the deposition and ensure the networking process and not adversely affect the properties of the applied films.