Binder system for high-gloss coatings

US10259967B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Ulrich Tromsdorf · Plankstadt, DE
• Rabie Al-Hellani · Ludwigshafen, DE
• Frederic Lucas · Offenburg, DE
• Sebastian Roller · Mannheim, DE

Key dates

• Filing date: Nov 23, 2015
• Grant date: Apr 16, 2019
• Expiry date: Nov 23, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D151/003
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Binder systems for high-gloss coatings and processes for producing them are provided, where the binder systems are prepared by preparing an aqueous polymer dispersion by radically initiated aqueous emulsion polymerization using defined first and second polymerization stages wherein the weight ratio of the sum of the total amounts of first polymerization stage monomers A1 to C1 (total monomer amount 1) to the sum of the total amounts of second polymerization stage monomers A2 to C2 (total monomer amount 2) is in the range 5:95 to 70:30, the amount of chain transfer agent in the second polymerization stage is selected such that the resulting overall polymer has a weight-average molecular weight of ≥15 000 and ≤50 000 g/mol, and the amount of the dispersing assistant is ≤3.0 wt %, based on the sum of total monomer amount 1 and total monomer amount 2 (total monomer amount).