Patent ID: 8637588

Claim:
An optical synthetic resin comprising: a synthetic resin; and fine particles dispersed in the synthetic resin at a ratio of 0.1 vol % or more to 50 vol % or less and each having a maximum length of 1 nm or more to 30 nm or less, wherein the fine particles comprise a first fine particle and a second fine particle, wherein a part of a surface of the first fine particle is modified with a first functional group and another part of the surface of the first fine particle is not modified, wherein a part of a surface of the second fine particle is modified with a second functional group and another part of the surface of the second fine particle is not modified, wherein the first functional group and the second functional group are bonded with each other, and wherein a distance between two arbitrary adjacent fine particles among the fine particles is 0.1 nm or more to 500 nm or less, wherein the first functional group is 3-ferrocenepropanecarboxylic acid and the second functional group is 5-aminovalerianic acid.