| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin composition characterized by having flame retardancy, a high refractive index and a low dispersing character. SOLUTION: The resin composition consists of a carbonate residue, a phosphonic acid residue represented by structural formula (1) and a divalent phenol residue represented by structural formula (2), and molar fractions of the phosphonic acid residue and the carbonate residue are specified by formula (3). [In structural formula (1), R1 is an organic; X is oxygen, sulfur or selenium atom; and in structural formula (2), each R2 is independently selected from among hydrogen and halogen atoms, a hydrocarbon and nitro; Y is selected from among a single bond, oxygen and sulfur atoms, an alkylene, an alkylidene, a cycloalkylene, a cycloalkylidene and a halo-substituted alkylene]. 1>(a)/ (a)+(b)}>=0.5 (3) [In formula (3), (a) and (b) are each a mole number of the phosphonic acid residue and the carbonate residue, respectively.]. |
