Process of decoration of powder coated substrates

• Main Authors: MARELLI, ERNESTO, RODRIGUEZ-SANTAMARTA, CARLOS, REKOWSKI, VOLKER
• Format: Patent
• Language: English; French; German
• Published: 03.06.2009
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DECORATIVE ARTS; DYES; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MOSAICS; NATURAL RESINS; PAINTS; PAPERHANGING; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PRODUCING DECORATIVE EFFECTS; TARSIA WORK; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS

The present invention is directed to process of decorating a powder coated substrate comprising the steps (a) treating a substrate surface to be coated, (b) applying a powder coating composition on the treated substrate surface and curing the powder coating composition, and (c) covering the cured powder coating with a support comprising a decoration, and transfer the decoration onto the coated substrate surface by heating, wherein a powder coating composition is used comprising (A) 30 to 80 wt% of a mixture of at least one polyester resin A having a hydroxyl number in the range of 30 to 60 mg KOH/g, a weight average molar mass Mn in a range of 3100 to 5000 and a glass transition temperature Tg of 40 to 60 °C and at least one polyester resin B having a hydroxyl number in the range of 250 to 350 mg KOH/g, a weight average molar mass Mn in a range of 2000 to 3000, (B) 10 to 40 wt% of at least one hardener selected from the group consisting of diisocyanates, polyisocyanates and urethdiones, and (C) 0,01 to 40 wt% of at least one coating additive, pigment and/or filler, the wt% being based on the total weight of the powder coating composition, and wherein the transfer by heating is performed in a temperature range between 160 °C and 220 °C. The process provides a coated substrate surface with permanent decorations on it and additionally with a very good anti-graffiti performance for a long time period.