| 摘要 |
Thermoplastic branched polycarbonates of high molecular weight possessing flame-resistant (self-extinguishing) properties are characterised in that the macromolecule contains carbonate units, units deriving from a dihydroxyaromatic compound of formula: <CHEM> where: R is a single bond; or a substituted or non-substituted linear or branched C1-C5 alkylene radical; or a group chosen from O, S, SO2, CO; X, Y, which can be the same or different, are H or CH3; m, n which can be the same or different, are whole numbers from 1 to 4, units deriving from a halogenated triphenyl compound of formula: <CHEM> where: R1 is hydrogen or a linear or branched C1-C5 alkyl radical Z is Cl or Br Z min is H or Cl or Br, and units deriving from a polyfunctional organic compound acting as a branching agent. |
