Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Reexamination Certificate
2000-02-23
2001-09-25
Green, Anthony (Department: 1755)
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
C106S436000, C423S263000, C423S579000, C423S592100, C423S593100, C423S598000, C423S608000
Reexamination Certificate
active
06294011
ABSTRACT:
This application is an application under 35 U.S.C. Section 371 of International Application No. PCT/FR98/01141, filed on Jun. 4, 1998.
The present invention is concerned with a titanium-, cerium- and alkaline- or alkaline-earth-based compound, processes for the preparation thereof, and use thereof as a colouring pigment.
Inorganic colouring pigments are already widely used in a number of industries, notably in the paint, plastics and ceramics industries. In such applications, the properties of thermal and/or chemical stability, dispersability (the ability of the product to disperse correctly in a given medium), compatibility with the medium to be coloured, intrinsic colour, colouring ability and opacifying ability are, inter alia, particularly important criteria which have to be taken into consideration when choosing a suitable pigment.
The problem posed is that most inorganic pigments which are suitable for applications such as those above and which are currently used efficiently on an industrial scale usually call upon metals (notably cadmium, lead, chromium, cobalt) the use of which is becoming subject to increasingly strict regulations, or is even banned, under the legislation of many countries owing to their toxicity which is believed to be very high. In particular, yellow pigments of the chrome yellow or yellow lead ore type may be cited by way of non-limitative example.
It can therefore be seen that there is a great need for a number of inorganic pigments which can be used instead.
The aim of the present invention is therefore to provide a replacement pigment in the yellow range which is free from toxic metals.
To this end, the titanium-, cerium- and alkaline- or alkaline-earth-based compound according to the invention is characterised in that it corresponds to formula (I):
M
x
Ce
y
Ti
z
O
t
wherein M represents an alkaline or an alkaline-earth and x, y and z satisfy the following equations:
0.1≦
y/z≦
1.5
1≦(
x+z
)/
y≦
15
x+y+z=
1
(
x+
3
y+
4
z
)/2≦
t≦
(
x+
4
y+
4
z
)/2
The invention is also concerned with a process for the preparation of the compound such as defined hereinabove, which, in accordance with a first variant, is characterised in that it comprises the following steps:
a mixture is formed which comprises a titanium salt, sol or suspension, a compound of the element M, and a cerium compound;
the mixture thus formed is dried and calcined.
According to a second variant, the process for the preparation of the compound as defined hereinabove is characterised in that it comprises the following steps:
a cerium compound, a titanium compound and a base are brought together in a liquid medium, whereby a precipitate is obtained;
a compound of the element M and the precipitate thus obtained are brought together;
the mixture obtained is dried and then calcined.
REFERENCES:
patent: 4313925 (1982-02-01), Bamberger
patent: 5340799 (1994-08-01), Tauber et al.
Roth et al., Chemical Abstracts, vol. 88, No. 26, 1978, XP-002055339, Jun. 1978.*
Kani, Chemical Abstracts, vol. 120, No. 14, Apr., 1994, XP-002055338.
Hedouin Catherine
Seguelong Thierry
Chimie Rhodia
Green Anthony
Seugnet Jean-Louis
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