Polyester carbonate resin composition, and optical lens and optical film using same

A polyester carbonate resin composition, which comprises:

• a polyester carbonate resin comprising
• a structural unit (A) that is represented by general formula (1),
• a structural unit (B) that is derived from at least one compound selected from the group consisting of 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,10-decanediol, and 1,12-dodecanediol (C12-diol), and
• a structural unit (i) that is derived from a dicarboxylic acid or a carboxylic acid diester represented by general formula (I);
• and
• a higher alcohol fatty acid ester:
• wherein in formula (1):
• X represents a single bond or a fluorene group;
• when X is a single bond, Ra and Rb are each independently selected from a halogen atom;
• an alkyl group having 1 to 20 carbon atoms;
• an alkoxyl group having 1 to 20 carbon atoms;
• a cycloalkyl group having 5 to 20 carbon atoms;
• a cycloalkoxyl group having 5 to 20 carbon atoms;
• an aryl group having 6 to 20 carbon atoms;
• a heteroaryl group having 6 to 20 carbon atoms or an aryloxy group having 6 to 20 carbon atoms, which contains at least one heterocyclic atom selected from O, N and S;
• and —C≡C—Rh;
• when X is a fluorene group, Ra and Rb are each independently selected from a hydrogen atom;
• a halogen atom;
• an alkyl group having 1 to 20 carbon atoms;
• an alkoxyl group having 1 to 20 carbon atoms;
• a cycloalkyl group having 5 to 20 carbon atoms;
• a cycloalkoxyl group having 5 to 20 carbon atoms;
• an aryl group having 6 to 20 carbon atoms;
• a heteroaryl group having 6 to 20 carbon atoms or an aryloxy group having 6 to 20 carbon atoms, which contains at least one heterocyclic atom selected from O, N and S;
• and —C≡C—Rh;
• Rh represents an aryl group having 6 to 20 carbon atoms, or a heteroaryl group having 6 to 20 carbon atoms which contains at least one heterocyclic atom selected from O, N and S;
• A and B each independently represent an alkylene group having 1 to 4 carbon atoms;
• m and n each independently represent an integer of 1 to 6;
• and
• a and b each independently represent an integer of 0 to 10,
• wherein in formula (I):
• R1 and R2 each independently represent a hydrogen atom;
• a fluorine atom;
• a chlorine atom;
• a bromine atom;
• an iodine atom;
• an alkyl group having 1 to 6 carbon atoms;
• or an aryl group having 6 to 20 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aralkyl group having 7 to 17 carbon atoms, which may contain a heterocyclic atom selected from O, N and S;
• a and b each independently represent an integer of 0 to 5;
• n and m each independently represent an integer of 1 to 5;
• and
• Ri and Rii each independently represent a hydrogen atom, or an alkyl group having 1 to 5 carbon atoms.