Patent ID: 8846790

Claim:
A resin composition, comprising: an epoxy resin; a hardener; and a modifier, which is a polymer solution obtained from the following steps: (a) dissolving an N,O-heterocyclic compound of Formula I or Formula II into a first solvent to form a first reaction solution; wherein, R1 to R3 are independently selected from the group consisting of H, a halogen, a C1-C10 alkyl, a C1-C10 cycloalkyl, and a C6-C20 aryl; W1 and W2 are independently selected from the group consisting of H, a halogen, an ether group, a thioether group, a sulfonyl, a sulfinyl, a carbonyl, a C1-C10 alkyl, a C1 -C10 cycloalkyl and a C6-C20 aryl; m and n are independently an integer ranging from 1 to 4; p is an integer ranging from 1 to 3; and q is an integer ranging from 1 to 4; (b) heating the first reaction solution to a first temperature to carry out a ring-opening polymerization to provide a solution of ring-opening polymerized product; and (c) cooling the solution of ring-opening polymerized product to a second temperature to substantially terminate the ring-opening polymerization to obtain the polymer solution, wherein, the first solvent is unreactive to the N,O-heterocyclic compound; the first temperature is higher than the softening temperature of the N,O-heterocyclic compound and lower than the boiling point of the first solvent; and the second temperature is lower than the first temperature, and wherein, the amount of the hardener is about 1 part by weight to about 100 parts by weight per 100 parts by weight of the epoxy resin, and based on the solid, the amount of the modifier is about 0.5 parts by weight to about 20 parts by weight per 100 parts by weight of the epoxy resin.