| abstract |
The present invention relates to a composite film including an acrylic polymer and a urethane polymer, in which the acrylic polymer contains an acrylic component including an acrylic acid-based monomer and a monofunctional (meth)acrylic monomer whose homopolymer has a glass transition temperature (Tg) of 0°C or higher, the acrylic acid-based monomer is contained in an amount of from 1% to 30% by weight in the acrylic component, the urethane polymer contains a urethane component obtained by reacting a diol with a diisocyanate, with respect to the amounts of the diol and the diisocyanate, an NCO/OH equivalent ratio is from 1.1 to 2.0, and the composite film contains N,N-dimethylformamide (DMF) soluble matter. |