Thermoplastic Resin Composition, Optical Film, And Process For Producing Film

2:

• The thermoplastic resin composition as claimed in claim 1, wherein the cycloolefin-based polymer (A) is a polymer obtained from a monomer represented by the following formula (I):
• wherein m, n, s and t are each independently an integer of 0 to 2, R1, R2, R3, R4, R5 and R6 are each independently an atom or a group selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted hydrocarbon group of 1 to 30 carbon atoms which may have a linkage containing an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom, and a polar group, R7, R8, R9 and R10 are each independently an atom or a group selected from the group consisting of a hydrogen atom, a halogen atom, a substituted or unsubstituted hydrocarbon group of 1 to 30 carbon atoms which may have a linkage containing an oxygen atom, a nitrogen atom, a sulfur atom or a silicon atom, and a polar group, and may be bonded to each other to form a monocyclic or polycyclic group which may have a hetero atom, R7 and R8, or R9 and R10 may be united to form a divalent hydrocarbon group, and R7 or R8, and R9 or R10 may be bonded to each other to form a carbon ring or a heterocyclic ring (said carbon ring or said heterocyclic ring may have a monocyclic structure or may be condensed with another ring to form a polycyclic structure).

4:

• The thermoplastic resin composition as claimed in any one of claims 1 to 3, wherein the vinyl-based polymer (B) is obtained by mixing a vinyl-based polymer (C) obtained from a polar group-containing monomer and an aromatic vinyl-based monomer with a compound represented by the following formula (V):
• wherein R5 and R6 have the same meanings as those of R5 and R6 in the formula (III).

5:

• The thermoplastic resin composition as claimed in claim 4, wherein the polar group-containing monomer is an acid anhydride-containing monomer.

6:

• The thermoplastic resin composition as claimed in any one of claims 1 to 5, wherein the vinyl-based polymer (B) is contained in an amount of 20 to 200 parts by weight based on 100 parts by weight of the cyclopolyolefin based cycloolefin-based polymer (A).

7:

• An optical film containing the thermoplastic resin composition of any one of claims 1 to 6 as a main component.

8:

• The optical film as claimed in claim 7, which gives retardation to a transmitted light.

9:

• The optical film as claimed in claim 8, which has properties that the ratio of a retardation Re(400) at a wavelength of 400 nm to a retardation Re(550) at a wavelength of 550 nm, Re(400)/Re(550), is in the range of 1.0 to 0.1, and the ratio of a retardation Re(800) at a wavelength of 800 nm to a retardation Re(550) at a wavelength of 550 nm, Re(800)/Re(550), is in the range of 1.5 to 1.0.

10:

• A process for producing an optical film, comprising forming the thermoplastic resin composition of any one of claims 1 to 6 into the film using a solution casting method.

11:

• A process for producing an optical film, comprising forming the thermoplastic resin composition of any one of claims 1 to 6 into the film using a melt extrusion method.