Abstract: A free-flowing, stable liquid flame retardant mixture comprised of or formed by mixing together components comprised of: A) at least one organic halogen-containing reactive flame retardant in which the halogen is bromine, chlorine or both; and B) a liquid additive that is comprised of at least one aliphatic polyepoxide of the formula R(EP)n, wherein R is a straight chain or branched chain aliphatic moiety which consists of carbon, hydrogen, and optionally, one or more ether oxygen atoms and/or one or more epoxy oxygen atoms; Ep is a terminal epoxy group: and n is a whole or fractional number in the range of 2 to about 6. Such mixtures can be effectively used in the preparation of flame retardant rigid polyurethanes and rigid foams thereof, and rigid polyisocyanurate and rigid foams thereof. Component B) serves as an effective hardener for such polymers and foams.

Abstract: The present invention relates to flame retarded polyurethane foam formulations with low smoke performance.

Abstract: A free-flowing, stable liquid flame retardant mixture comprised of or formed by mixing together components comprised of: A) at least one organic halogen-containing reactive flame retardant in which the halogen is bromine, chlorine or both; and B) a liquid additive that is comprised of at least one aliphatic polyepoxide of the formula R(EP)n, wherein R is a straight chain or branched chain aliphatic moiety which consists of carbon, hydrogen, and optionally, one or more ether oxygen atoms and/or one or more epoxy oxygen atoms; Ep is a terminal epoxy group: and n is a whole or fractional number in the range of 2 to about 6. Such mixtures can be effectively used in the preparation of flame retardant rigid polyurethanes and rigid foams thereof, and rigid polyisocyanurate and rigid foams thereof. Component B) serves as an effective hardener for such polymers and foams.

Abstract: 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.