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AssigneeHoechst Aktiengesellschaft
InventorsHorst Staendeke, Wilhelm Adam, Franz-Josef Dany, Joachim Kandler
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The invention relates to stabilized, pulverulent red phosphorus, consisting of phosphorus particles having a particle size of at most about 2 mm, and an oxidation stabilizer which envelops the phosphorus particles in the form of a thin layer, wherein (a) the oxidation stabilizer is a combination of aluminum hydroxide and a hardened epoxide resin system having an epoxide equivalent weight of about 170 to 500, (b) the total amount of the oxidation stabilizer is 0.1-5% by weight, based on the amount of red phosphorus, and (c) the proportion of aluminum hydroxide is about 0.01 to 3% by weight, and the proportion of epoxide resin is about 0.09 to 4.99% by weight, in each case based on the amount of the red phosphorous.
An improved stabilized pulverulent red phosphorus consisting of phosphorus particles having a particle size of at most about 2 mm, and an oxidation stabilizer enveloping the phosphorus particles in the form of a thin layer, the improved phosphorus containing
A process for the manufacture of the stabilized pulverulent red phosphorus, consisting of phosphorus particles having a particle size of at most about 2 mm, and an oxidation stabilizer which envelops the phosphorus particles in the form of a thin layer, which comprises introducing a water-soluble aluminum salt and an aqueous or alcoholic solution or dispersion of an epoxide resin and of a hardener into an aqueous suspension of the red phosphorus, establishing a pH-value of about 5 to 9, stirring the mixture for 1 to 3 hours at a temperature of 20.degree. to 90.degree. C., with precipitation of the aluminum hydroxide and simultaneous hardening of the epoxide resin, filtering off the stabilized phosphorus and finally drying it at an elevated temperature.
Dependencies are inferred from the claim text.