Aqueous dispersion of a polyester and a polyamide of low acid number and coating composition comprising same for applying a basecoat

US10160872B2 · 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
• Stefanie BOSHE-PLOIS · Ochtrup, DE
• Susanne Katharina Fechtner · Munster, DE
• Ralf Nickolaus · Drensteinfurt, 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: C09D167/08
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an aqueous dispersion (P) comprising at least one polymeric resin (P1) and at least one polymeric resin (P2) different therefrom, where the polymeric resin (P1) is a polyamide and the polymeric resin (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, (P) being obtainable by dispersing of (P1) in water or an aqueous medium in the presence of (P2), and where (P1) has an acid number <10 mg of KOH per g of polyamide, and (P) contains at most 25 wt %, based on the total weight of (P), of one or more organic solvents, and also to an aqueous coating composition comprising (P), at least one binder (A) comprising at least one polymeric resin (A1), which is different from the polymeric resins (P1) and (P2), and at least one pigment (B) for at least partly coating a substrate with a basecoat film.