BROMINATED ARYL PHOSPHOLANE FLAME RETARDANTS

摘要

For most applications polymeric materials must contain flame retardant additives. Traditionally, organohalogen compounds, particularly brominated aromatics, have been utilized in this application. They are generally readily available in relatively pure form at acceptable cost and are effective gas phase flame retardants. However, increasing concern about the accumulation of organohalogen compounds in the environment make the development of flame retardants that are effective at very low loading particularly attractive. Compounds that display two modes of action might impart sufficient flame retardancy at much lower levels than traditional organohalogen flame retardants. Brominated aryl phospholanes contain both bromine (for gas phase activity) and phosphorus (for solid phase activity). The carbon-carbon bond of these five-membered hetrocycles undergoes thermolysis at modest temperatures to generate a diradical capable of initiating polymerization of vinyl monomers. The resulting polymer contains flame retarding units in the mainchain.