Patent ID: 7442757

Claim:
A resin comprising a polymer in which (A) a divalent structural unit having a spiro ring, represented by formula (1), is directly bonded to, (B) a diol residue, represented by formula (2), and which has a number average molecular weight of at least 17,700: wherein R 1 is independently selected from the group consisting of a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group having the carbon number of 1 to 20, an aromatic hydrocarbon group having the carbon number of 1 to 20, and a nitro group; p and q are integers satisfying p+q=0 to 16; X independently represents oxygen, sulfur or selenium; and Y is independently selected from oxygen, sulfur, and a methylene group; n and m are integers satisfying n+m=0 to 4; and —O—R 2 —O— (2) wherein R 2 represents an alicylene group having the carbon number of 2 to 20, or an arylene group having the carbon number of 6 to 40.