Water-dilutable coating agent for preparing the base layer of a multilayer coating

US4489135A · kind A · utility

Assignee

• BASF Farben Fasern Aktiengesellschaft · DE

Inventors

• Hermann Drexler · Munich, DE
• Franz Ebner · Kist, DE
• Hans-Dieter Hille · Bensberg, DE
• Ulrich Roth · Darmstadt, DE

Key dates

• Filing date: Feb 18, 1983
• Grant date: Dec 18, 1984
• Expiry date: Feb 18, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A water-dilutable coating agent for preparing the base layer of a multilayer coating. The coating agent contains pigments and optionally flow-control agents, thixotroping agents, fillers, organic solvents and other customary auxiliaries. The coating agent contains as a binder an aqueous polyuretane dispersion which has a polyuretane resin acid number of 5 to 70 and which as been prepared by reacting: PA1 (A) a linear polyether diol and/or polyester diol having terminal hydroxyl groups and a moleucar weight of 400 to 3,000 with PA1 (B) a diisocyanate in such a molar ratio that an intermediate product is formed which has terminal isocyante groups, PA1 (C) and reacting the intermediate product with a compound which has two groups which are reactive toward isocyanate groups and at least one group which is capable of forming an anion and which has been neutralized with a tertiary amine before the reaction, converting the second intermediate product, obtained from (A), (B) and (C) into a predominantly aqueous phase and PA1 (D) reacting the isocyanate groups which are still present with a diamine and/or polyamine having primary and/or secondary amino groups.