Iron oxide yellow pigments having a low silking effect and a pro

Details Iron oxide yellow pigments having a low silking effect and a pro Iron oxide yellow pigments having a low silking effect and a pro

1986-04-16

1987-10-06

Lieberman, Paul

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106309, C09C 124

Patent

active

046981004

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.
A Portion of Technical Bulletin Alkydal, "Alkydal F 48", ed. 8/1/66 (6 pages).

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