Patent ID: 8057902

Claim:
A phosphorus-containing epoxy resin containing a naphthol-aralkyl skeleton represented by general formula (1), wherein a is an integer of 1, 2, 3, 4, 5 or 6, b is an integer of 1, 2, 3, 4, 5, 6 or 7, c is an integer of 1 or more, X is benzene, naphthalene, anthracene, phenanthrene or biphenyl, Y is at least one of general formulae (2)-(4), with at least one of general formula (3) or general formula (4) being present, wherein d is 0 or 1 R 1 and R 2 independently are a hydrocarbon group and can be a normal chain, branch chain or cyclic structure, or R 1 can be bonded with R 2 and form a cyclic structure, wherein e is 0 or an integer of 1, 2, 3, 4 or 5, b is an integer of 1, 2, 3, 4, 5, 6 or 7, g is an integer of 1 or more, d is 0 or 1, f is an integer of 1, 2, 3, 4, 5 or 6, the sum total of f and e is an integer of 1, 2, 3, 4, 5 or 6, R 1 and R 2 are independently a hydrocarbon group and can be a normal chain, branch chain or cyclic structure or R 1 can be bonded with R 2 and can form a cyclic structure, X is benzene, naphthalene, anthracene, phenanthrene or biphenyl, Y is at least one of general formulae (2)-(4), Z is at least one of general formulae (5) and (6), wherein h is 0, 1, 2 or 3, R 3 is a hydrocarbon group and can be a normal chain, branch chain or cyclic structure, wherein i is 0, 1, 2, 3, 4 or 5, and R 3 is a hydrocarbon group and can be a normal chain, branch chain or cyclic structure.