Patent ID: 7619037

Claim:
A transparent resin composition which comprises at least one block polymer (A) selected from the group consisting of (A1) and (A2) defined below and a transparent resin (B), with the difference in refractive index between (A) and (B) being not more than 0.01: (A1): A block polymer composed of an aromatic ring-containing lipophilic block (a) having a refractive index of not lower than 1.575 and a volume resistivity of 10 12 to 10 17 Ω·cm and an aromatic ring-containing hydrophilic block (b) having a volume resistivity of 10 5 to 10 11 Ω·cm and a thermal degradation temperature of 250 to 380° C. in air, with the difference in SP value from (B) being not greater than 1; (A2): A block polymer composed of an aromatic ring-containing lipophilic block (a) having a refractive index of not lower than 1.575 and a volume resistivity of 10 12 to 10 17 Ω·cm, an aromatic ring-containing hydrophilic block (b) having a volume resistivity of 10 5 to 10 11 Ω·cm and a thermal degradation temperature of 250 to 380° C. in air and a transparent resin block (c) having a refractive index of not lower than 1.540 and a difference in SP value from (B) of 0 to 0.5, with the difference in SP value from (B) being not greater than 1.5; (B): A transparent resin having a refractive index of not lower than 1.540, and wherein (b) is at least one block selected from the group consisting of: (b1): nonionic hydrophilic blocks comprising an alkylene oxide adduct derived from a dihydric phenol; (b2): anionic hydrophilic blocks; and (b3): cationic hydrophilic blocks.