Coating agent compositions that are suitable for dip coating and that cure at low temperature

US11401428B2 · kind B2 · utility

Assignee

• CHEMETALL GMBH · DE

Inventors

• Aliaksandr Frenkel · Frankfurt, DE
• Ron Eilinghoff · Frankfurt, DE
• Martin Droll · Schlangen, DE

Key dates

• Filing date: Jul 20, 2018
• Grant date: Aug 2, 2022
• Expiry date: Mar 25, 2039

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B05D2350/60
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Aqueous coating compositions are provided. The aqueous compositions include at least one type of organic polymer particles having an average particle size of 10 to 1000 nm, including isocyanate-reactive polymers (A), one or more ketoxime- and/or pyrazole-blocked polyisocyanates (B) including at least one aromatic hydrocarbyl radical or at least one cycloaliphatic hydrocarbyl radical, at least one polyanionic polymer (C), at least one complex fluoride (D) selected from the group consisting of hexa- or tetrafluorides of metallic elements of groups IVb, Vb and VIb of the Periodic Table of the Elements, and at least one aminosilane (E), wherein the aqueous coating compositions have a pH of 3 to 5, and have a total solids content of 5% to 35% by weight. Also provided are processes for producing these aqueous coating compositions, processes for coating metal ion-releasing surfaces with the aqueous coating compositions, and coatings obtained therefrom.