Process for the preparation of pigment paste resins for cathodically depositable coating compositions having quaternized oxazolidine functional groups

US4968730A · kind A · utility

Assignee

• Vianova Kunstharz, AG · AU

Inventors

• Helmut Honig · Geretsried, DE
• Georg Pampouchidis · Graz, AT
• Herbert Matzer · Graz, AT

Key dates

• Filing date: Sep 21, 1989
• Grant date: Nov 6, 1990
• Expiry date: Sep 21, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/4434
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Preparation of pigment paste resins for cathodically depositable coating compositions based on epoxy resin-amine adducts obtained from unmodified or modified epoxy resins, which by partial or complete reaction of secondary amino groups with formaldehyde contain oxazolidine structures; whose tertiary amino groups introduced via primary-tertiary diamines are quaternized to at least 20 mol % using an organic acid and a monoglycidyl compound and which in a solution adjusted with water to a correct application viscosity contain a total of 80 to 100 millimoles of acid per 100 g of solid resin are described. The pigment pastes possess, both in concentrated and dilute form, a stability which meets practical requirements and, because of their rheology, are readily processed to ensure formation of defect-free films both during deposition and crosslinking by stoving. The applied films have good properties.