Patent ID: 7906562

Claim:
An epoxy resin represented by formula 1, possessing one or more primary hydroxyl groups and one or more epoxy groups in its molecule, wherein a is 0 or an integer of 1 or more, b is 0 or an integer of 1 or more, c is 0 or an integer of 1 or more, d is an integer of 1 or more, wherein a+c is an integer of 1 or more, l is an integer of 1 or more, m is 0 or 1, (Ep) is a reaction residue of an epoxy resin and is specifically represented by formulae 2 and 3, (E) is a reaction residue of an epoxy resin and is specifically represented by formulae 4 and 5, (X) is a carbon atom or a hydrocarbon group which can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom, (A) is a hydrocarbon group of an acid anhydride residue and can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom, R is a hydrogen atom or a hydrocarbon group which can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom, wherein n is an integer of 1 or more, Y is a hydrocarbon group and can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom and, further, can have a linear, branch, ring, aromatic ring or heterocyclic structure, wherein q is an integer of 1 or more, r is 1 or 2, Q is a hydrocarbon group and can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom and, further, can have a linear, branch, ring, aromatic ring or heterocyclic structure, Z indicates —O—, —COO— or —N═, wherein u is 0 or an integer of 1 or more, t is an integer of 1 or more, Y′ is a hydrocarbon group and can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom and, further, can have a linear, branch, ring, aromatic ring or heterocyclic structure, wherein w is 1 or 2, x is 0 or an integer of 1 or more, y is an integer of 1 or more, Q′ is a hydrocarbon group and can contain a nitrogen atom, phosphorus atom, oxygen atom or sulfur atom and, further, can have a linear, branch, ring, aromatic ring or heterocyclic structure and Z′ indicates —O—, —COO— or —N═.