Title:
【発明の名称】不動態化された粉末状赤リン、およびその製法
Document Type and Number:
Japanese Patent JPH0791046
Kind Code:
B2
Abstract:
Desensitised, pulverulent red phosphorus is prepared by treatment of red phosphorus with a desensitising agent comprising an organic compound which is liquid at room temperature and atmospheric pressure, inert towards red phosphorus and has a low vapour pressure. It comprises more than 98 to 99.95% by weight of red phosphorus having a particle size of up to about 2 mm and 0.05 to less than 2% by weight of a water-emulsifiable organic compound. This red phosphorus is prepared by introducing an aqueous emulsion of the organic compound serving as desensitising agent into an aqueous suspension of red phosphorus having a particle size of up to about 2 mm in such a manner that less than 2 to 0.05 parts by weight of the organic compound are present per more than 98 to 99.95 parts by weight of red phosphorus, after which the pH is brought to 5 to 9 and the mixture is then stirred at a temperature of 20 to 90 DEG C for 0.5 to 3 hours and the desensitised red phosphorus is finally, after filtration, dried at elevated temperature.
Inventors:
Horst Schuttendeke
Urzus Teyumler
Urzus Teyumler
Application Number:
JP21818085A
Publication Date:
October 04, 1995
Filing Date:
October 02, 1985
Export Citation:
Assignee:
Hoechst Actien Gezershaft
International Classes:
C01B25/00; C01B25/023; (IPC1-7): C01B25/023
Attorney, Agent or Firm:
Toshio Yano (1 outside)