Patent ID: 6992151

Claim:
A cured phosphorus-containing epoxy resin prepared by cross-linking an epoxy resin or an advanced epoxy resin in a molten state of said epoxy resin or an advanced epoxy resin and in the presence of a hardener having a formula selected from the group consisting of (a), (b), (c) and (d): wherein R 1 , R 2 independently are H, C1~C18 alkyl, C6~C18 aryl, C6~C18 substituted aryl, C6~C18 aryl methylene, or C6~C18 substituted aryl methylene; n′=0~11; Z=—NH 2 , —NHR, or —R; o=1~3; o′=3~10; r=0~6; R, Q and p are defined as above; wherein R is defined as above and n=0–5; wherein either all the A or all the A′ in each formula of (a) to (d) are H, and at least one of the A is not H when all the A′ are H in each formula of (a) to (d), and at least one of the A′ is not H when all the A are H in each formula of (a) to (d); or a hardener mixture comprising one said hardener having said formula and an additional different hardener for epoxy resin.