Flame retardant composition and polyurethane foams containing same
The present invention relates to flame-retardant compositions for use in polyurethane foams, the flame-retardant composition comprising: (a) a phosphate ester blend comprising triphenyl phosphate and one or more alkyl-substituted triphenyl phosphates; and (b) a polyol crosslinking agent soluble in the phosphate ester blend. The invention also relates to flexible polyurethane foams containing these flame-retardant compositions.
1 . A flame-retardant composition for use in polyurethane foams, said flame-retardant composition comprising:
(a) a phosphate ester blend comprising triphenyl phosphate and one or more alkyl-substituted triphenyl phosphates; and
(b) a polyol crosslinking agent soluble in the phosphate ester blend.
2 . The flame-retardant compositon of claim 1 wherein said alkyl is C 1 to C 4 alkyl.
3 . The flame-retardant composition of claim 1 wherein said phosphate ester blend is butylated triphenyl phosphate.
4 . The flame-retardant composition of claim 1 wherein said polyol is a polyester-polyol.
5 . The flame-retardant composition of claim 3 wherein said butylated triphenyl phosphate comprises triphenyl phosphate and butyl-substituted triphenyl phosphate.
6 . The flame-retardant composition of claim 5 wherein said butyl-substituted triphenyl phosphate comprises a mixture of t-butylphenyl diphenylphosphate and bis-(t-butylphenyl)phenylphosphate.
7 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 1 .
8 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 2 .
9 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 3 .
10 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 4 .
11 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 5 .
12 . A flame-retarded polyurethane foam comprising a flame-retardant amount of the flame-retardant composition of claim 6 .