AMMONIUM HALIDE FLAME-RETARDANT COATED WITH UNSATURATED POLYESTER RESIN

摘要

PURPOSE:To provide a flame retardant exhibiting excellent dispersibility when compounded and kneaded with a resin, resistant to thermal discoloration, and having sufficient flame-retarding effect, by coating ammonium halide with an unsaturated polyester resin. CONSTITUTION:Particles of ammonium chloride or ammonium bromide having particle diameter of =100mum, preferably 10-30mum are mixed with 10-50wt%, preferably 20-35wt% unsaturated polyester resin having low viscosity (preferably a resin of general-purpose grade or coating grade) and an arbitrary component selected from antimony trioxide and a diluting solvent (e.g. benzene, toluene, etc.), and are uniformly dispersed by a high-speed mixer. The obtained mixture is cured as it is and pulverized, or the mixture is pulverized by a spray drier and cured to obtain the objective flame retardant consisting of ammonium halide coated with an unsaturated polyester.