Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1984-07-11
1986-11-04
Lieberman, Paul
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
106309, C09C 162
Patent
active
046208798
ABSTRACT:
Iron oxide yellow pigments having a silking effect .DELTA.E.sub.1 *, less than or equal to 0.5, and having color values which range for L* from 52-63, for a* from 8 to 14 and for b* from 40 to 48 CIELAB units are produced by a process by first, forming needle-shaped .alpha.-FeOOH yellow pigment nuclei in the presence of compounds containing the elements B, Al, Ga, Si, Ge, Sn or Pb present in a quantity of from 0.05 to 10% by weight, where the quantity is calculated as the tri- or tetra-valent oxides of the compounds and based on the .alpha.-FeOOH which is precipitated during nucleation, and second, growing iron oxide yellow pigments on the thus formed iron oxide yellow nuclei.
REFERENCES:
patent: 2388659 (1945-11-01), Ryan et al.
patent: 3867516 (1975-02-01), Bodson
patent: 3918985 (1975-11-01), Ebenhoech et al.
patent: 4292294 (1981-09-01), Patil et al.
patent: 4374677 (1983-02-01), Senda et al.
patent: 4376656 (1983-03-01), Senda et al.
patent: 4459276 (1984-07-01), Nobuoka et al.
International Organization for Standardization, 1982 (ISO/DIS 7724, 1-3 drafts), "Paints and Varnishes--Colorimetry", Part 1, 2 and 3.
Brunn Horst
Burow Wilfried
Nollen Klaus
Printzen Helmut
Bayer Aktiengesellschaft
Lieberman Paul
Thompson Willie J.
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