| 摘要 |
A free-flowing, stable liquid flame retardant mixture comprised of or formed by mixing together components comprised of. A tetrabromobisphenol-A B at least one liquid ester of a pentavalent acid of phosphorus and C at least one additional organic halogen-containing reactive flame retardant where the halogen is chlorine or bromine or both. Such mixtures can be effectively used in the preparation of flame-retardant polyurethanes including rigid polyurethane foams. It is preferable to include one or more liquid esters of a pentavalent acid of phosphorus in the liquid flame retardant mixture. C is preferably at least one diester/diol of tetrabromophthalic anhydride, especially a mixed ester of tetrabromophthalic anhydride with diethylene glycol and propylene glycol, which by itself is a relatively viscous substance. |
