Rutile (TiO.sub.2) pigments coated with (1) trigonal anhydrous a

Details Rutile (TiO.sub.2) pigments coated with (1) trigonal anhydrous a Rutile (TiO.sub.2) pigments coated with (1) trigonal anhydrous a

1981-05-26

1983-06-28

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106306, 106308B, 427315, C09C 136, C09C 306

Patent

active

043903746

ABSTRACT:
This invention relates to new inorganic pigments consisting or consisting essentially of a TiO.sub.2 rutile nucleus, of a first adherent coating of trigonal Al.sub.2 O.sub.3 and of a second adherent coating of cubic MeAl.sub.2 O.sub.4, in which Me is Co, Ni, Cu, Zn or Mg. These pigments are obtained by mixing TiO.sub.2 rutile particles coated with Al.sub.2 O.sub.3, with a MeO oxide or a Me compound capable of providing MeO in a subsequent calcination step, and by calcining the mixture in the presence of air at temperatures in the range of from 750.degree. to 1000.degree. C.

REFERENCES:
patent: Re27818 (1973-11-01), Werner
patent: 2559638 (1951-07-01), Krchma et al.
patent: 3079269 (1963-02-01), Chrest et al.
patent: 3450550 (1969-06-01), Linton
patent: 3523810 (1970-08-01), Swank
patent: 3748165 (1973-07-01), Hill
patent: 3834923 (1974-10-01), Hodgkin et al.
patent: 4050951 (1977-09-01), Piccolo et al.
patent: 4097300 (1978-06-01), Balducci et al.
patent: 4227935 (1980-10-01), Blake et al.

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