HEAT-SENSITIVE COATING MATERIAL AND LASER MARKING METHOD USING THE SAME

• Main Authors: ARAYA KOTARO, AIDA KOHEI, SOMA KENICHI, OGINO MASAHIKO, FUJII KENJIRO, KAWASAKI MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 05.03.2020
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COLOUR PRINTING; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; LINING MACHINES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS; USE OF MATERIALS THEREFOR; WOODSTAINS

To provide a heat-sensitive coating material which can be color-developed with laser and has a high color-developing speed.SOLUTION: In order to solve the above subject, a heat-sensitive coating material according to the present invention includes amorphous first particles containing leuco dye, color developer and decolorant. When heated at a heating rate of 30°C/min from a temperature below the glass transition point of the first particles to the melting point, the heat-sensitive coating material develops a color at a temperature equal to or higher than the glass transition point of the first particles and lower than the melting point and decolorized at the melting point.SELECTED DRAWING: Figure 8 【課題】 本発明は、レーザーで顕色可能であって、顕色速度の速い感熱塗料を提供することを目的とする。【解決手段】 上記課題を解決するために、本発明に係る感熱塗料はロイコ染料、顕色剤及び消色剤を含み、非晶質な第一粒子を備え、第一粒子のガラス転移点以下の温度から融点まで、加熱速度３０℃／分で加熱した際に、第一粒子のガラス転移点以上であって融点未満の温度で顕色し、融点において消色することを特徴とする。【選択図】図８