| abstract |
An object of the present invention is to provide a multilayer film excellent in transparency, retardation controllability and heat-and-moisture resistance and environmentally friendly, and a polarizing plate using the same. An optical system comprising polylactic acid (component A) and a compound (component C) having at least a cyclic structure in which one carbodiimide group is bonded to the first nitrogen and the second nitrogen by a bonding group. Each of which includes at least one layer 5 (P layer) and a layer 6 (N layer) made of an optically negative resin (D component), and the polylactic acid (A component) is poly D -The multilayer film 7 which is polylactic acid containing a lactic acid component and a poly L-lactic acid component, and has a stereocomplex crystallinity (S) of 90% or more, and a polarizing plate using the same. [Selection] Figure 2 |