Adhesion promoter for coating compositions suitable for producing surfacer coats

US10870764B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Audree Andersen · Havixbeck, DE
• Manuela Niemeier · Drensteinfurt, DE
• Simone Hesener · Munster, DE

Key dates

• Filing date: Jul 31, 2015
• Grant date: Dec 22, 2020
• Expiry date: Mar 30, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2150/50
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a mixture (M) which can be used as curing agent and as adhesion promoter and which comprises at least two components (M1) and (M2), which are different from one another and have in each case independently of one another free and/or blocked isocyanate groups, and which optionally comprises a further component (M3) different from (M1) and (M2); component (M1) comprises at least one aliphatic polyisocyanate, and component (M2) comprises at least one aliphatic polyisocyanate having polyether units, wherein the relative weight ratio of (M1) and (M2) in (M) to one another is in a range from 25:1 to 3:1, based in each case on the solids content of (M1) and (M2), and at least one of the components (M1), (M2), and optionally (M3) present in (M) has hydrolyzable silane groups, to a use of (M) as curing agent and adhesion promoter in a coating composition, to such a coating composition, and to methods for at least partly coating a substrate with a surfacer coat and for at least partly coating a substrate with a multicoat paint system.