BINDER RESIN FOR NEAR-INFRARED ABSORBING FILM, AND NEAR-INFRARED ABSORBING FILTER USING THE SAME

摘要

Disclosed is a binder resin for near-infrared absorbing films, which exhibits good adhesion to a transparent film as the base, while stably containing a near-infrared absorbent. This binder resin itself is hard to be cured. Also disclosed is a near-infrared absorbing film using such a binder resin. The binder resin for near-infrared absorbing films is obtained by adding a near-infrared absorbing dye (C) having an absorption maximum wavelength of 800-1200 nm to a resin composition containing 20-80% by mass of a (meth)acrylic polymer (A) having a Tg of from-65°C to 20°C and a weight average molecular weight of not more than 100,000 and 80-20% by mass of a (meth)acrylic polymer (B) having a Tg of from 50°C to 180°C. This binder resin for near-infrared absorbing films is characterized in that the polymer (A) contains a polymer (a) which has a crosslinkable functional group at two or more ends of the polymer chain.