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    51.
    发明专利
    未知

    公开(公告)号：DD131742A5

    公开(公告)日：1978-07-19

    申请号：DD19950677

    申请日：1977-06-15

    Applicant: HOECHST AG

    Inventor： STAENDEKE HORST ,  DANY FRANZ-JOSEF ,  KANDLER JOACHIM ,  AUEL THEODOR ,  KLOSE WERNER

    IPC: C01B25/023 ,  C01B25/00

    Abstract: 1519929 Red phosphorus HOECHST AG 27 May 1977 [17 July 1976] 22500/77 Heading C1A Stabilized pulverulent red phosphorus comprises a homogeneous blend of red phosphorus particles with a size of at most about 2mm and as an oxidation stabilizer a metal compound of the second or third group of the Periodic System, the metal compound being the aluminium, magnesium, calcium or zinc salt of an alkyl-, cycloalkyl-, aryl- or aralkyl-phosphonic acid having 1 to 20 carbon atoms, the metal compound being present in the homogeneous blend in a proportion of 0À5 to 5 weight per cent. Red phosphorus particles may-be intimately blended with 0À5 to 5 weight per cent, based on red phosphorus, of an alkyl-, cycloalkyl-, aryl- or aralkyl-phosphonic acid having 1 to 20 carbon atoms; the blend suspended in water and the suspension heated to 60 to 95‹ C.; the suspension gradually admixed with at least stoichiometric proportions of an aqueous solution of a water-soluble aluminium, magnesium, calcium or zinc salt to cause precipitation of the respective phosphoric acid salt from the aqueous suspension at a pH of 3À0 to 6À0 and preferably at a temperature of from 80 to 90‹ C.; the resulting mixture filtered, and the filter residue dried at elevated temperature, suitably at 80 to 130‹ C., and if desired, under reduced pressure. Preferred water-soluble salts are Al 2 (SO 4 ) 3 .18H 2 O, Ca(NO 3 ) 2 .4H 2 O, ZnSO 4 .7H 2 O and MgSO 4 .7H 2 O, which may be used in the form of 5 to 20 weight per cent aqueous solutions. The aluminium salt is suitably precipitated at pH 3À0 to 3À5 and the salts of the other metals at pH 5À0 to 6À0.

    STABILIZED AND DESENSITIZED FLOWABLE RED PHOSPHORUS
    59.
    发明专利
    STABILIZED AND DESENSITIZED FLOWABLE RED PHOSPHORUS 未知

    公开(公告)号：CA1282576C

    公开(公告)日：1991-04-09

    申请号：CA490078

    申请日：1985-09-05

    Applicant: HOECHST AG

    Inventor： STAENDEKE HORST ,  THUEMMLER URSUS

    IPC: C01B25/00 ,  C01B25/023 ,  C08K3/02

    Abstract: STABILIZED AND DESENSITIZED FLOWABLE RED PHOSPHORUS Stabilized and desensitized pulverulent flowable red phosphorus consisting of particles with a size of at most 2 mm, and process for making it. To this end, red phosphorus is prepared from yellow phosphorus. Next, an aqueous suspension of pulverulent red phosphorus is freed from residual fractions of yellow phosphorus by treating it with a sodium hydroxide solution, and the red phosphorus in the aqueous suspension is stabilized with aluminum hydroxide and a hardened epoxide resin and desensitized in the aqueous suspension by means of a water-emulsifiable organic compound which is liquid, inactive with respect to phosphorus and has a low vapor pressure at room temperature and at atmospheric pressure.

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