Aqueous coating composition for applying a basecoat film, comprising a mixture of a polyester and a polyamide with low acid number as rheological assistant

US10160871B2 · kind B2 · utility

Assignee

• BASF COATINGS GMBH · DE

Inventors

• Cathrin Corten · Unna, DE
• Dirk Eierhoff · Munster, DE
• Patrick Wilm · Ahlen, DE
• Joerg Schwarz · Munster, DE
• Susanne Katharina Fechtner · Munster, DE

Key dates

• Filing date: Aug 21, 2015
• Grant date: Dec 25, 2018
• Expiry date: Aug 21, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2201/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous coating composition comprising at least one mixture (M) of at least one polymeric resin (P1) and at least one polymeric resin (P2), different therefrom, where (P1) is a polyamide and (P2) is a polyester which is at least obtainable by reaction of at least one polymerized aliphatic C12-C24-monocarboxylic acid with at least one diol and/or polyol, at least one binder (A) comprising at least one polymeric resin (A1), which is different from the polymeric resins (P1) and (P2), at least one pigment (B), where the polyamide used as polymeric resin (P1) has an acid number <10 mg of KOH per g of polyamide and the mixture (M) is obtainable by dispersing of the polymeric resin (P1) in water or an aqueous medium in the presence of the polymeric resin (P2), to a method for at least partly coating a substrate with a basecoat film by means of the aqueous coating composition, and to a use of the mixture (M) as a rheological assistant in aqueous coating compositions.