NEAR INFRARED ABSORBENT CONSISTING OF DITHIOL METAL COMPLEX, METHOD FOR PREPARING SAID DITHIOL METAL COMPLEX, AND OPTICAL FILTER AND THERMAL INFRARED SHIELDING FILTER CONTAINING SAME

摘要

The present invention relates to a near infrared absorbent consisting of a novel dithiol metal complex, a method for preparing said dithiol metal complex, and an optical filter and a thermal infrared shielding filter containing said near infrared absorbent. The near infrared absorbent of the present invention consists of a dithiol metal complex that selectively absorbs near infrared only, and as said dithiol metal complex has improved solubility with respect to organic solvents, efficient mixing is accomplished with organic materials including polymeric resin, etc., which are mixed when manufacturing an optical filter, so that sufficiently superior performance of rear infrared absorption of said dithiol metal complex is exhibited, and a novel near infrared absorbent is prepared, the near infrared absorption capability whereof does not deteriorate over a long period. Furthermore, the near infrared absorbent of the present invention is provided and manufactured either through a manufacturing process step or in a separate master batch form; thus, it may be usefully utilized for an optical filter, particularly a thermal infrared shielding filter using a near infrared absorption dye and having both selective near infrared shielding effects that are superior to existing coating-type films, and excellent high temperature stability.