| 摘要 |
Thermoplastic, branched, high-molecular-weight polycarbonates endowed with flame-proof properties (self-extinguishing properties) are characterized in that they contain in their macromolecule carbonate units, units deriving from a di-hydroxy-aromatic compound having the formula: <CHEM> wherein: R is a single bond; or R is a linear or branched, either substituted or non-substituted, alkylene radical of from 1 to 5 carbon atoms; or R is selected from the group consisting of O, S, SO2, CO; X, Y which may be either equal to, or different from, each other, are either H or CH3; m, n which may be either equal to, or different from, each other, are integers comprised within the range of from 1 to 4; and units deriving from a halogenated macrocyclic compound having the formula: <CHEM> wherein: R1 is H or OH or chlorine or bromine, and R2 is chlorine or bromine. |
