| abstract |
These compounds are represented by formula (I): with in particular R₁, R₂ = C₁-C₁₂ alkyl, cycloalkyl, aryl, Y-R₄ (Y = single bond, heteroatom, C₁-C₁₂ alkyl; and R₄ = phosphorus group, hydroxyl, carboxyl, ester, -Si (R₆) ₂H (R₆ = alkyl, cycloalkyl, etc.)); A₁ = - (CR₈R₉) n - (R₈, R₉ = H or alkyl; n = 1 to 6), or -NR₁-A₁-NR₂- forms a nitrogen heterocyle; (R₁₁ = alkyl, cycloalkyl, etc .;; A = O or S); A₃ and A₄ are both equal to -O- (x ≧ 1 in these cases) or represent respectively - R₂ and - R₁; 0 ≦ x ≦ 100; 2 ≦ p ≦ 100.n n n These compounds are agents having the triple function of initiator, chain transfer agent and termination agent in the radical polymerization of vinyl monomers. In addition, these compounds and the multifunctional vinyl polymers obtained by radical polymerization of at least one vinyl monomer in their presence are used as fire retardant additives or components. |