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: English; French; Japanese
• Published: 07.06.2012
• 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 (a) 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 (a) has a thickness of 2-10 µm, and wherein the metal sheet has excellent chemical resistance. La présente invention concerne une feuille métallique exempte de chromate, colorée et revêtue, qui possède, formé sur au moins une surface d'une feuille métallique, un film (a) de revêtement coloré qui comporte un composant filmogène comportant une résine de polyuréthane (A1) contenant un groupe urée, un groupe uréthane et un groupe carboxyle, un pigment colorant (B) et des particules sphériques de silice (C) ayant un diamètre moyen de particule de 5 à 50 nm, la résine de polyuréthane (A1) contenant des unités structurales issues chacune d'un composant polyester polyol (a) ayant une structure à noyau aromatique et des unités structurales issues chacune d'un composant isocyanate (b) ayant une structure à noyau aromatique, chacune des unités structurales issues du composant isocyanate (b) contenant une structure à noyau aromatique, le film (a) de revêtement coloré ayant une épaisseur de 2 à 10 µm, et la feuille métallique ayant une excellente résistance aux agents chimiques.