Coating processes – Nonuniform coating – Applying superposed diverse coatings or coating a coated base
Patent
1993-05-12
1995-02-14
Bell, Janyce
Coating processes
Nonuniform coating
Applying superposed diverse coatings or coating a coated base
106427, 106429, 106431, 106450, 106452, 106481, 427226, 427287, 4273762, 427379, 4274191, 427261, B05D 500, C09C 104, C08K 300
Patent
active
053894022
ABSTRACT:
A method for producing decorations which are color-stable in a porcelain firing (glost firing), and a pigment composition suitable for this method, is disclosed. Inclusion pigments based on heavy-metal sulfides and selenides in an oxidic or silicate casing, especially ZrSiO.sub.4, result in more color-stable decorations in a porcelain firing if color-stabilizing auxiliary agents from the series of Zn compounds, especially ZnO or zinc-containing glass frits, or cerium(III) or cerium(IV) compounds, especially CeO.sub.2, are used in the decorative layer and/or glaze layer as color-stabilizing auxiliary agents. The amount used in the decorative layer is generally 5 to 50% by weight in the case of ZnO and CeO.sub.2, relative to the inclusion pigment. The pigment composition contains at least one of the color-stabilizing auxiliary agents in addition to an inclusion pigment.
REFERENCES:
patent: 3802900 (1974-04-01), Broll et al.
patent: 3847639 (1974-11-01), Broll et al.
patent: 4216023 (1980-08-01), Kinstle
patent: 4394064 (1983-07-01), Dauson
patent: 4769310 (1988-09-01), Gugger et al.
patent: 4874433 (1989-10-01), Kiss et al.
Teuchert, K., et al., "On the process of glaze formation and a source of certain feldspathic porcelain glaze defects", cfi/Ber. DKG Feb. 1982, pp. 142-148, cited on p. 4 of the application.
Kerstan, W., "Die rohstoffe zur herstellung farbiger glasuren und keramischer farbkoerper", Sprechsaal (1990), vol. 123, pp. 1190-1201 with English language translations of what appears to be the most relevant portions.
Halbritter Guenter
Horst Jenny
Kiss Akos
Loew Rita
Speer Dietrich
Bell Janyce
Degussa - Aktiengesellschaft
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