RFID TAG SUBSTRATE INCLUDING PAPER BASE, AND RFID TAG

摘要

To improve weather resistance of an RFID tag containing a paper substrate having an antenna circuit formed on the surface thereof.;An RFID tag substrate containing a paper substrate having an eluted chloride ion amount per unit mass (1 g) according to the following item (A) of 0.100 mg or less, having formed on a surface thereof a conduction circuit:(A) a specimen of the paper substrate having an area corresponding to an A4 size (210 × 297 mm) determined in ISO 216 is broken into small pieces each of 100 mm² or less; the small pieces are entirely placed in a polypropylene vessel; 50 mL of water having an electric conductivity of 0.2 mS/m or less is added thereto to immerse the small pieces entirely into the water; after allowing to stand at 23°C ±2°C for 1 hour, the water is filtered with a membrane filter to recover a filtrate; and the filtrate is analyzed by an ion chromatography method to obtain a chloride ion (Cl^-) concentration in the filtrate, from which a total chloride ion amount eluted into 50 mL of the water is obtained, and is divided by the mass (g) of the specimen of the paper substrate to provide a value, which is designated as the eluted chloride ion amount per unit mass.