| abstract |
The invention is a flame retardant for styrene foams. The flame retardant contains both aromatic bromine and an olefin. The olefin is an internal olefin. Desirable flame retardants are selected from: n formula I: n nwherein R 1 is C 1 -C 6 and optionally containing a heteroatom or olefin; R 2 is C 1 -C 6 and optionally containing a heteroatom or olefin; and R 3 -R 12 is H, C 1 -C 6 (optionally containing a heteroatom), or halogen; and further wherein the compound of formula I is present in a concentration of at least 50 percent of a trans isomer;n nformula II:n n nwherein R 1 is Halogen, C 1 -C 6 and optionally containing a heteroatom or olefin; R 2 is Halogen, C 1 -C 6 and optionally containing a heteroatom or olefin; and R 3 -R 7 is H, C 1 -C 6 (optionally containing a heteroatom), or halogen; andn nformula III:n n nwherein R 1 is Halogen, C 1 -C 6 and optionally containing a heteroatom or olefin; R 2 is Halogen, H, C 1 -C 6 and optionally containing a heteroatom or olefin; and R 3 -R 6 is H, halogen. |