초록 ▼

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

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.

대표청구항 ▼

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) as the oxidation stabilizer a combina

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) as the oxidation stabilizer a combination of aluminum hydroxide and a hardened epoxide resin system having an epoxide equivalent weight of about 170 to 500, (b) the oxidation stabilizer in a total proportion of 0.1-5% by weight, based on the amount of red phosphorus, and (c) the aluminum hydroxide in a proportion of about 0.01 to 3% by weight, and the epoxide resin in a proportion of about 0.09 to 4.99% by weight, based in each case on red phosphorus. 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°to 90°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.