Patent ID: 8242266

Claim:
A phosphorus-containing benzoxazine defined by a formula (1): wherein the R is an alkyl group having 1-10 carbon atoms or an unsubstituted phenyl group; the R′ is hydrogen atom, alkyl of 1-6 carbon atoms, oxyalkyl of 1-6 carbon atoms, phenyl group, biphenyl group, cyclic alkyl of 3-7 carbon atoms, or a group with following structure: wherein R n is hydrogen atom, alkyl of 1-6 carbon atoms, oxyalkyl of 1-6 carbon atoms, phenyl group, biphenyl group, halogen, nitro group, phenoxy group, and cyclic alkyl of 3-7 carbon atoms, R m is —NO 2 , —COOH, —SO 3 H, —COH, —NHCOCH 3 , or —OCH 3 , and n, m independently are an integer from 0 to 4.