| 摘要 |
PURPOSE:To obtain a flame retardant for synthetic resin, which does not adversely affect mechanical properties, excels in flame retardancy and does not cause surface bleed, by using a brominated urethane-modified oligomer as a component. CONSTITUTION:A flame retardant comprising a brominated urethane-modified oligomer having bromine groups in the molecule. Among them, a brominated urethane-modified oligomer prepared by reacting an isocyanate-terminated prepolymer of an equivalent <=2,500 (solid matter) with a brominated active hydrogen compound (A) of formula I and a dialkylhydrazine and/or an active hydrogen compound (B) in which a t-butyl group is bonded to the nitrogen atom at a ratio in the range of 0.5 >=equivalent of B/(equivalent of A+ equivalent of B) >=0 is particularly desirable. In formula I, R is H or methyl, m <=5 and X is formula II or III.
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