A MIXTURE OF DIIMONIUM COMPOUNDS, METHOD FOR SYNTHESIZING THE SAME, A NEAR INFRARED RAY ABSORBING FILM COMPRISING THE SAME AND AN OPTICAL FILTER COMPRISING THE NEAR INFRARED RAY ABSORBING FILM FOR PLASMA DISPLAY PANEL

摘要

This invention provides a near infrared ray absorbing film, which contains a diimonium compound having a relatively broad near infrared ray absorbing wavelength range and has good heat resistance and resistance to moist heat and other various properties, and an optical filter utilizing the near infrared ray absorbing film for PDPs. A mixture of diimonium compounds represented by formula (1) which are different from each other in n value in formula (1), is stacked on a transparent support film, or is incorporated in a pressure-sensitive adhesive layer to prepare a near infrared ray absorbing film. An optical filter for PDPs is prepared using the near infrared ray absorbing film. (1) wherein n-Pr represents an n-propyl group; iso-Bu represents an isobutyl group; and n is an integer of 0 to 8.