Patent ID: 7557152

Claim:
A reactive flame retardant, comprising an organophosphorus compound represented by the following general formula (I) or (II), the organophosphorus compound having a terminal unsaturated group: where X 1 to X 3 each independently represent —OH or a group represented by the following formula (A), X 4 represents a single bond or a group represented by the following formula (B), and one or more of X 1 to X 3 each represent a group represented by the following formula (A) and containing CH 2 ═CH—CH 2 — at a terminal of the group; where R 1 represents CH 2 ═CH—CH 2 —, an aryl group having 12 or less carbon atoms, or an aralkyl group having 12 or less carbon atoms, R 2 and R 3 each independently represent a hydrogen atom, CH 2 ═CH—CH 2 —, an aryl group having 12 or less carbon atoms, or an aralkyl group having 12 or less carbon atoms, and Y represents a single bond, —NH—, or —O—; where R 4 to R 9 each represent a group selected from phenyl, benzyl, α-naphthyl, β-naphthyl, p-biphenyl, phenoxy, benzyloxy, α-naphthoxy, β-naphthoxy, p-biphenyloxy, (CH 2 ═CH—CH 2 ) 2 N—, CH 2 ═CH—CH 2 NH—, CH 2 ═CH—CH 2 O—, and CH 2 ═CH—CH 2 — groups, R 10 represents H or CH 2 ═CH—CH 2 —, at least one of R 4 to R 10 represents a group containing CH 2 ═CH—CH 2 —, at a terminal of the group, and R 4 to R 9 may be identical to or different from one another.