Patent ID: 8063163

Claim:
A method for improving transparency of a molded body, comprising: adjusting a cycloolefin-based copolymer to include: a content of 20-80 mole % of repeating units derived from at least one cycloolefin-based monomer selected from the group consisting of a monomer represented by general formula (I), a monomer represented by general formula (II), a monomer represented by general formula (III), a monomer represented by general formula (IV), and a monomer represented by general formula (V); and a content of 80-20 mole % of repeating units derived from an α-olefin-based monomer, wherein a content of the repeating units derived from the cycloolefin-based monomer present as a dimer (Rd) is adjusted to 50 mole % or less and a content of the repeating units derived from the cycloolefin-based monomer present as a trimer (Rt) is adjusted to 5 mole % or more wherein, in the formula, R 1 , R 2 , R 3 , and R 4 each independently represents hydrogen, a linear or branched alkyl group having a carbon number of 1 to 8, an aryl group having a carbon number of 6 to 18, an alkylene aryl group having a carbon number of 7 to 20, or a cyclic or non-cyclic alkenyl group having a carbon number of 2 to 20; a carbon atom may be covalently bonded to R 1 , R 2 , R 3 , and R 4 by a saturated, unsaturated, or aromatic ring; and R 1 , R 2 , R 3 , and R 4 may be replaced by a polar group comprising a halogen atom, hydroxyl group, ester group, alkoxy group, carboxy group, cyano group, amido group, imido group, or silyl group.