Conductive coating composition and conductive film for shielding electromagnetic wave made thereof

• Main Author: KIM SANG J.,BAE CHANG S.,JOUNG YOUNG G.,KIM HYUN D.,CHUNG HAE R
• Format: Patent
• Language: English
• Published: 05.07.2006
• Subjects: ADHESIVES; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FILLING PASTES; INKS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PRINTED CIRCUITS; USE OF MATERIALS THEREFOR; WOODSTAINS

Disclosed herein is an electroconducdve paint composition for electromagnetic wave shielding, which can effectively solve the problems of electromagnetic interference (EMI) and radio frequency interference (RFI) caused by electromagnetic waves generated from the internal elements of various electronic devices. The composition contains a silver-coated copper powder having fine particle size, so that it can greatly improve the durability of an electroconductive film prepared therefrom. The electroconductive paint composition comprises an aqueous polyurethane dispersion, a metal powder, a solvent and a rheology control agent, in which the metal powder is either a silver-coated copper powder having an average particle size of 2-20 m or a mixture of the silver-coated powder and a silver powder having an average particle size of 2-10 m, and the aqueous polyurethane dispersion is a mixture of at least two kinds of aqueous polyurethane dispersions.