Mixtures of aluminum hydrogenphosphites with aluminum salts, process for the production thereof and the use thereof

1. A mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4.

2. The mixture as claimed in claim 1 , wherein

v is 2.56 to 2.99,

y is 0.9 to 0.02 and

z is 0 to 1.

3. The mixture as claimed in claim 1 , wherein

v is 2.834 to 2.99,

y is 0.332 to 0.03 and

z is 0.01 to 0.1.

4. The mixture as claimed in claim 1 , comprising 95 to 99.9% by weight of aluminum hydrogenphosphites of the formula (I), 0.1 to 5% by weight of aluminum salts and 0 to 50% by weight of water (of crystallization).

5. The mixture as claimed in claim 1 , wherein the aluminum salts are oxides, hydroxides, peroxides, peroxide hydrates, carbonates, percarbonates, mixed carbonates/hydrates, formates, acetates, propionates, stearates, lactates, ascorbates, oxalates, or aluminum salts with anions of acids having a higher vapor pressure than phosphorous acid.

6. The mixture as claimed in claim 1 , having

a particle size of 0.1 to 1000 μm,

a solubility in water of 0.01 g/l to 10 g/l,

a bulk density of 80 to 800 g/l and

a residual moisture content of 0.1 to 5%.

7. A process for preparing a mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4 comprising the step of reacting an aluminum source and a phosphite source without solvent at temperatures of 20 to 300° C. for 0.1 to 10 h.

8. The process as claimed in claim 7 , wherein the aluminum sources are aluminum metal, aluminum alloys, oxides, hydroxides, peroxides, peroxide hydrates, carbonates, percarbonates, mixed carbonates/hydrates, formates, acetates, propionates, stearates, lactates, ascorbates, oxalates, or aluminum salts with anions of acids having a higher vapor pressure than phosphorous acid.

9. The process as claimed in claim 7 , wherein the phosphite sources are phosphorous acid or precursors thereof, phosphorus trioxide, phosphorus trichloride, elemental phosphorus, hypophosphorous acid or mixtures thereof.

10. A flame-retardant thermoplastic or thermoset polymer molding composition or polymer molding, film, filament or fiber comprising 0.1 to 45% by weight of a mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4, 55 to 99.9% by weight of thermoplastic or thermoset polymer or mixtures thereof, 0 to 55% by weight of additives and 0 to 55% by weight of filler or a reinforcing material, where the sum of the components is 100% by weight.

11. The flame-retardant thermoplastic or thermoset polymer molding composition or polymer molding, film, filament or fiber as claimed in claim 10 , wherein the flame retardant is dialkylphosphinic acids and/or salts thereof; condensation products of melamine, reaction products of melamine with phosphoric acid, reaction products of condensation products of melamine with polyphosphoric acid or mixtures thereof; nitrogen-containing phosphates of the formulae (NH 4 ) y H 3−y PO 4 or (NH 4 PO 3 ) z , where y is 1 to 3 and z is 1 to 10 000; benzoguanamine, tris(hydroxyethyl) isocyanurate, allantoin, glycoluril, melamine, melamine cyanurate, dicyandiamide, guanidine; magnesium oxide, calcium oxide, aluminum oxide, zinc oxide, manganese oxide, tin oxide, aluminum hydroxide, boehmite, dihydrotalcite, hydrocalumite, magnesium hydroxide, calcium hydroxide, zinc hydroxide, tin oxide hydrate, manganese hydroxide, zinc borate, basic zinc silicate, zinc stannate or mixtures thereof.

12. The flame-retardant thermoplastic or thermoset polymer molding composition or polymer molding, film, filament or fiber as claimed in claim 10 , wherein the flame retardant is melam, melem, melon, dimelamine pyrophosphate, melamine polyphosphate, melam polyphosphate, melon polyphosphate, melem polyphosphate and mixed poly salts thereof, ammonium hydrogenphosphate, ammonium dihydrogenphosphate, ammonium polyphosphate or mixtures thereof.

13. The flame-retardant thermoplastic or thermoset polymer molding composition or polymer molding, film, filament or fiber as claimed in claim 10 , wherein the flame retardant is aluminum hypophosphite, zinc hypophosphite, calcium hypophosphite, sodium phosphite, monophenylphosphinic acid and salts thereof, mixtures of dialkylphosphinic acids and salts thereof, monoalkylphosphinic acids and salts thereof, 2-carboxyethylalkylphosphinic acid and salts thereof, 2-carboxyethylmethylphosphinic acid and salts thereof, 2-carboxyethylarylphosphinic acid and salts thereof, 2-carboxyethylphenylphosphinic acid and salts thereof, oxa-10-phosphaphenanthrene (DOPO) and salts thereof, adducts onto para-benzoquinone, or itaconic acid and salts thereof.

14. An intermediate for further syntheses, a binder, a crosslinker or accelerator in the curing of epoxy resins, polyurethanes and unsaturated polyester resins, a polymer stabilizer, a crop protection composition, a sequestrant, a mineral oil additive, as an anticorrosive, a washing composition a cleaning composition or an electronic composition including a mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4.

15. A flame retardant, a flame retardant for clearcoats and intumescent coatings, a flame retardant for wood and other cellulosic products, a reactive and nonreactive flame retardant for polymers, a flame-retardant polymer molding composition, a flame-retardant polymer molding a flame retardant for rendering polyester and pure and blended cellulose fabrics flame-retardant by impregnation, or a synergist in flame retardant mixtures comprising a mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4.

16. A flame-retardant thermoplastic or thermoset polymer molding composition or polymer molding, film, filament or fiber comprising 0.1 to 45% by weight of a mixture of aluminum hydrogenphosphites of the formula (I)

Al 2.00 (HPO 3 ) v (H 2 PO 3 ) y x (H 2 O) z   (I)

with aluminum salts comprising

91 to 99.9% aluminum hydrogenphosphites of the formula (I)

0.1 to 9% aluminum salts and

0 to 50% water (of crystallization),

where v in formula (I) is 2 to 2.99, y is 2 to 0.01 and z is 0 to 4 55 to 99.9% by weight of a flame retardant, 55 to 99.9% by weight of thermoplastic or thermoset polymer or mixtures thereof, 0 to 55% by weight of additives and 0 to 55% by weight of filler or a reinforcing material, where the sum of the components is 100% by weight.