Optical component and sulfur-containing poly(thio)ester (co)polymer

An optical component obtained by molding a poly(thio)ester (co)nolvmer comprising a repeating structural unit represented by the formula (1-A) as an essential structural unit:

• (wherein R11 is a cyclic alkylene group, straight-chain or cyclic alkylene group containing at least one sulfur atom in a sulfide group, or a combination of the straght-chain and cyclic alkylene groups;
• R12 is a mono- or poly-cyclic aliphatic or aromatic dicarboxylic acid residue;
• and X11 and X12 are each independently an oxygen atom or sulfur atom, and when X11 and X12 are the oxygen atoms, R11 is a straight-chain or cyclic alkylene group containing at least one sulfur atom in the sulfide group, or a combination of the straight-chain and cyclic alkylene groups) and a repeating structural unit represented by the formula (1-B):
• (wherein R15 is a divalent alicyclic hydrocarbon group;
• and R16 is an alicyclic or aromatic dicarboxylic acid residue).

A poly(thio)ester copolymer comprising a repeating structural unit represented by the formula (1-A) as an essential structural unit:

• (wherein R11 is a cyclic alkylene group, straight-chain or cyclic alkylene group containing at least one sulfur atom in a sulfide group, or a combination of the straight-chain and cyclic alkylene groups;
• R12 is a mono- or poly-cyclic aliphatic or aromatic dicarboxylic acid residue;
• and X11 and X12 are each independently an oxygen atom or sulfur atom, and when X11 and X12 are the oxygen atoms, R11 is a straight-chain or cyclic alkylene group containing at least one sulfur atom in the sulfide group, or a combination of the straight-chain and cyclic alkylene groups) and a repeating structural unit represented by the formula (1-B):
• (wherein R15 is a divalent alicyclic hydrocarbon group;
• and R16 is an alicyclic or aromatic dicarboxylic acid residue).

An optical component obtained by molding a poly(thio)ester copolymer comprising a repeating structural unit represented by the formula (1-A) as an essential structural unit:

• wherein R11 is represented by one of the following formulae:
• (wherein “k” is an integer of 1 to 4;
• “I” is an integer of 0 to 3;
• and R13 and R14 are each a hydrogen atom or alkyl group);
• R12 is an aromatic dicarboxylic acid residue;
• and X11 and X12 are each independently an oxygen atom or sulfur atom.

A poly(thio)ester copolymer comprising a repeating structural unit represented by the formula (1-A) as an essential structural unit:

• wherein R11 is represented by one of the following formulae:
• (wherein “I” is an integer of 0 to 3;
• and R13 and R14 are each a hydrogen atom or alkyl group);
• R12 is an aromatic dicarboxylic acid residue;
• and X11 and X12 are each independently an oxygen atom or sulfur atom.