Phlegmatized red phosphorus

Details Phlegmatized red phosphorus Phlegmatized red phosphorus

1990-02-02

1991-01-15

Langel, Wayne A.

Chemistry of inorganic compounds

With additive

423322, C01B 25023

Patent

active

049852213

ABSTRACT:
Phlegmatized, pulverulent red phosphorus with good free-flowing properties comprises 95 to 99.95% by weight of red phosphorus having a particle size of up to 2 mm, and 0.05 to 5% by weight of polyurethane as phlegmatization agent.
This red phosphorus is prepared by introducing an aqueous polyurethane dispersion into an aqueous suspension of red phosphorus having a particle size of up to 2 mm, after a pH of from 5 to 9 has been set, in a manner such that 5 to 0.05 parts by weight of polyurethane are present per 95 to 99.95 parts by weight of red phosphorus, then stirring the mixture at a temperature of from 20 to 90.degree. C. for 0.5 to 3 hours, and finally drying the phlegmatized red phosphorus at elevated temperature after filtration.

REFERENCES:
patent: 3974260 (1976-08-01), Wortmann et al.
patent: 4356282 (1982-10-01), Largman
patent: 4489183 (1984-12-01), Twardowska

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