Colored and coated chromate-free metal sheet, and colored aqueous composition

• Main Authors: FUDA MASAHIRO, MORISHITA ATSUSHI, WADA YUUSUKE, HAYASHI KIMITAKA, SATOU RIE
• Format: Patent
• Language: Chinese; English
• Published: 07.08.2013
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS THEREFOR; WOODSTAINS

The present invention provides a colored and coated chromate-free metal sheet which has, formed on at least one surface of a metal sheet, a colored coating film (alpha) that comprises a film-forming component comprising a polyurethane resin (A1) containing a urea group, a urethane group and a carboxyl group, a coloring pigment (B) and spherical silica particles (C) having an average particle diameter of 5-50 nm, wherein the polyurethane resin (A1) contains structural units each derived from a polyester polyol component (a) having an aromatic ring structure and structural units each derived from an isocyanate component (b) having an aromatic ring structure, each of the structural units derived from the isocyanate component (b) contains an aromatic ring structure, and the colored coating film (alpha) has a thickness of 2-10 mum, and wherein the metal sheet has excellent chemical resistance.