Abstract: Provided are a dope solution for preparing a polarizing plate protective film by a solution casting method using an acrylic polymer with high thermal resistance and high molecular weight, and a polarizing plate protective film using the same. The polarizing plate protective film using the dope solution according to the present invention has excellent optical properties, high tensile strength, low hygroscopic properties, and high thermal resistance, and thus, has the effects of excellent dimensional stability, and excellent adhesion with a polyvinyl alcohol film.

Abstract: Provided are a smoothness improving additive for a calendering process and a polyvinylchloride-based composition including the same. More particularly, a smoothness improving additive allowing, even in the case of using a plasticizer in a smaller amount than the conventional amount used, excellent productivity and excellent processability in a calendering process to accelerate a production speed, excellent mechanical physical properties such as glass transition temperature and tensile strength of a molded body, and manufacture of a molded body having better smoothness is provided.