Red dye pigments and their production

    公开(公告)号:GB1112890A

    公开(公告)日:1968-05-08

    申请号:GB768567

    申请日:1967-02-17

    Applicant: BASF AG

    Abstract: The invention comprises pigment dyes of the formula wherein R1 is H, R2 is H, Cl or CH3, or R1 and R2 together complete a naphthalene ring, R3 is H, Cl or CH3, A is Ca or Ba, B is Mg, Ni, Co, Fe, Al or Cr, x is from 70 to 99.5, y is from 0.5 to 30, x + y is 100 and n is the valency of cation of B. They may be obtained by reacting an azo dye of the formula in an aqueous medium at temperatures up to 100 DEG C. with Ca or Ba salts and with Mg, Ni, Co, Fe, Al or Cr salts, the ratio of Ca or Ba salt or Mg, Ni, Co, Fe, Al or Cr being from 99.5 : 0.5 to 70 : 30 based on equivalent weights. Examples are given for the production of the lakes.

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