Method for preparing sulfonated polycarbonates and their use as flame retardants.

摘要

Polycarbonate resins are sulfonated by reaction with a sulfur trioxide-phosphate ester complex, preferably a 2:1 complex of sulfur trioxide with triethylphosphate. The sulfonated polymer is preferably converted to a salt, typically by reaction with a metal salt of a beta -diketone in a non-polar medium. The resulting sulfonate salts are useful as flame retardant agents for aromatic polycarbonates.