1-hydroxydihydrophosphole oxides and 1-hydroxy-phospholane oxides, preparation thereof and use thereof as flame retardants
AssigneeTicona LLC
InventorsHans-Jerg Kleiner, Winfried Budzinsky, Gunther Kirsch
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Abstract
Salts of 1-hydroxydihydrophosphole oxides and 1-hydroxyphospholane oxides and use thereof as flame retardants. The salts of 1-hydroxydihydrophosphole oxides and 1-hydroxyphospholane oxides are useful as flame retardants, especially for plastics such as polyester or polyamide. The aluminum salts are preferred.
Claims17
A method for improving the flame retardancy of a polymer, the method comprising incorporating into the polymer an aluminum salt comprising a reaction product of a phosphorous compound with an aluminum compound, the phosphorous compound comprising at least one of 1-hydroxydihydrophosphole oxide and 1-hydroxyphospholane oxide, the aluminum compound comprising aluminum carbonate, aluminum hydroxide or aluminum oxide, wherein the phosphorous compound to the aluminum compound are reacted in at least a 3:1 molar ratio, each aluminum valence being occupied by the phosphorous compound, and wherein the aluminum salt has at least one of the formulas (Ia'), (Ib') and (II'):
- ##STR2## where R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are, independently of each other, hydrogen or a straight-chain or branched alkyl group.
A flame-retardant polymer prepared by incorporating therein an aluminum salt comprising a reaction product of a phosphorous compound with an aluminum compound, the phosphorous compound comprising at least one of 1-hydroxydihydrophosphole oxide and 1-hydroxyphospholane oxide, the aluminum compound comprising aluminum carbonate, aluminum hydroxide or aluminum oxide, wherein the phosphorous compound to the aluminum compound are reacted in at least a 3:1 molar ratio, each aluminum valence being occupied by the phosphorous compound, and wherein the aluminum salt has at least one of the formulas (Ia'), (Ib') and (II'):
- ##STR3## where R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are, independently of each other, hydrogen or a straight-chain or branched alkyl group.
A method for improving the flame retardancy of a polymer, the method comprising incorporating into the polymer an aluminum salt comprising a reaction product of a phosphorous compound with an aluminum compound, the phosphorous compound comprising at least one of 1-hydroxydihydrophosphole oxide and 1-hydroxyphospholane oxide, the aluminum compound comprising aluminum carbonate, aluminum hydroxide or aluminum oxide, wherein the phosphorous compound to the aluminum compound are reacted in about a 3:1 molar ratio, each aluminum valence being occupied by the phosphorous compound, and wherein the aluminum salt has at least one of the formulas (Ia'), (Ib') and (II'):
- ##STR4## where R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are, independently of each other, hydrogen or a straight-chain or branched alkyl group.
A flame-retardant polymer prepared by incorporating therein an aluminum salt comprising a reaction product of a phosphorous compound with an aluminum compound, the phosphorous compound comprising at least one of 1-hydroxydihydrophosphole oxide and 1-hydroxyphospholane oxide, the aluminum compound comprising aluminum carbonate, aluminum hydroxide or aluminum oxide, wherein the phosphorous compound to the aluminum compound are reacted in about a 3:1 molar ratio, each aluminum valence being occupied by the phosphorous compound, and wherein the aluminum salt has at least one of the formulas (Ia'), (Ib') and (II'):
- ##STR5## where R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are, independently of each other, hydrogen or a straight-chain or branched alkyl group.
Dependencies are inferred from the claim text.