| abstract |
A thermoplastic resin composition which is inhibited from suffering phase separation and readily gives an optical film having excellent transparency; an optical film comprising the composition as a major ingredient; a retardation film which is a film formed by stretching the optical film, shows a positive wavelength dependence, and has a low photoelastic coefficient and transparency; and a process for producing the retardation film. The thermoplastic resin composition comprises (A) a cyclic-olefin polymer and (B) a vinyl polymer having a unit represented by the following general formula (II). (II) (III) (In the formula (II), at least one of R1 to R4 represents a group represented by the general formula (III), and the remainder of R1 to R4, if any, and R5 and R6 each represents hydrogen, halogeno, a (substituted) hydrocarbon group optionally having a connecting group containing a heteroatom, or a polar group, provided that R5 and R6 may be bonded to each other to form a monocyclic or polycyclic group optionally having a heteroatom or may in cooperation represent a divalent hydrocarbon group; and Y represents a divalent hydrocarbon group.) |