Pulverulent binders

US3935138A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Frank Wingler · Leverkusen, DE
• Josef Pedain · Cologne, DE
• Richard A. Muller · Berkeley, US
• Rolf Dhein · Krefeld, DE
• Eckhard de Cleur

Key dates

• Filing date: May 28, 1974
• Grant date: Jan 27, 1976
• Expiry date: May 28, 1994

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/934
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Powdered coating agent for use in the sprayed powder process comprising a mixture of PA1 A. free hydroxyl groups containing copolymers having been reacted with an acid anhydride; PA1 B. a cross-linker such as triglycidyl isocyanurate or bis- or tris-oxazolines and optionally PA1 C. auxiliary agents such as pigments and levelling agents. The copolymer contains polymerized units of PA1 30 to 85% by weight of styrene or derivatives thereof or methylmethacrylate or mixtures thereof; PA1 5 to 60% by weight of acrylic or methacrylic esters excepted methylmethacrylate and PA1 10 to 30% by weight of hydroxyalkylester of acrylic or methacrylic acid, said copolymer having been reacted with an aliphatic or cycloaliphatic dicarboxylic acid anhydride; PA1 4 to 20 parts by weight of the cross-linker are employed for 96 to 80 parts by weight of the acidified copolymer.