Halogenated isothiuronium salts as flame retardants

A flame retardant polymeric composition comprising a polymer selected from the group comprised of polyurethane, polyester, styrenic polymers, polyamides, cellulosic polymers, and epoxy polymers and a flame retarding amount of bromophenyl isothiuronium salts of the formula:

• ##STR6## wherein:
• each X substituent is independently selected from a group consisting of hydrogen, chlorine, bromine, alkyl, and haloalkyl, said alkyl containing 1 to 6 carbon atoms and said haloalkyl of 1 to 6 carbon atoms containing 1 to 3 halogen atoms, said halogen being independently selected from chlorine and bromine;
• each Y substituent is independently selected from a group consisting of halogen, hydrogen phosphate, hydrogen sulfate, nitrate, acetate, alkali-metal phosphate, and alkali-metal sulfate;
• each R substituent is independently selected from the group consisting of hydrogen, alkyl and haloalkyl, said alkyl containing 1 to 3 carbon atoms and said haloalkyl of 1 to 3 carbon atoms containing 1 to 3 halogen atoms, said halogen being selected from chlorine and bromine;
• and
• n is an integer from 1 to 5.

A flame retardant polymeric composition containing a flame retarding amount of bromophenyl isothiuronium salts of the formula ##STR7## wherein:

• each X substituent is independently selected from a group consisting of hydrogen, chlorine, bromine, alkyl, and haloalkyl, said alkyl containing 1 to 6 carbon atoms and said alkoalkyl of 1 to 6 carbon atoms containing 1 to 3 halogen atoms, said halogen being independently selected from chlorine and bromine;
• each Y substituent is independently selected from a group consisting of halogen, hydrogen phosphate, hydrogen sulfate, nitrate, acetate, alkali-metal phosphate, and alkali-metal sulfate;
• each R substituent is independently selected from the group consisting of hydrogen, alkyl and haloalkyl, said alkyl containing 1 to 3 carbon atoms and said haloalkyl of 1 to 3 carbon atoms containing 1 to 3 halogen atoms, said halogen being selected from chlorine and bromine;
• and
• n is an integer from 1 to 5.