PROCESS FOR PREPARING NITROGEN COMPOUNDS

摘要

PROCESS FOR PREPARING NITROGEN COMPOUNDS (Cyclo)alkylenediammonium-bis-tetrahalophthalates corresponding to the formula: wherein X is halogen and R is an alkylene or cycloalkylene group containing 2-15 carbon atoms are prepared by hydrolyzing a tetrahalophthalic anhydride to the corresponding tetrahalophthalic acid and then reacting the tetrahalophthalic acid in the resultant reaction mixture with a diaminoalkane or diaminocycloalkane containing 2-15 carbon atoms in a molar ratio of about two molar proportions of the acid per molar proportion of the diamine. The (cyclo)alkylenediammonium-bis-tetrahalophthalates of the invention are useful as flame retardants for normally flammable organic polymers and also have utility as intermediates for the preparation of N,N'-(cyclo)alkylene-bis-tetrahalophthalimides, which are also useful as flame retardants. The imides are prepared simply by heating the salts until an acid number of substantially 0 is obtained.