Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1998-05-20
2000-10-24
Koslow, C. Melissa
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106401, 106461, 428403, 428404, C08K 902, C09C 306, C09C 100
Patent
active
061360848
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a composition based on a sulphur compound, zinc and optionally a transparent oxide, to a process for its preparation and to its use as a dye pigment.
Inorganic dye pigments are already widely used in many industries, in particular in the paints, plastics and ceramics industries. Among these pigments are found a certain number of sulphur-containing compositions. In particular, products based on rare-earth sulphides have already been proposed by the Applicant as substitutes for pigments comprising metals with reputedly very high toxicity such as, in particular, cadmium, lead, chromium and cobalt, whose use is becoming increasingly severely controlled. Compositions based on sesquisulphides of rare earth and of alkali metal elements have thus been described in EP-A-545,746.
Besides the problem of toxicity in certain cases, sulphur-based pigments generally have the drawback of releasing H.sub.2 S in certain applications, for example during their incorporation into media containing traces of water, such as polymers, and most particularly when this incorporation is carried out at a relatively high temperature, for example a temperature of at least 200.degree. C.
There is thus a need for sulphur-based pigments whose release of H.sub.2 S is minimized.
The object of the invention is to provide such pigments.
With this aim, the composition according to the invention is characterized in that it comprises: zinc precursor with aqueous ammonia and/or an ammonium salt.
According to a specific embodiment of the invention, the composition of the invention is characterized in that it also comprises a layer based on at least one transparent oxide deposited at the surface of the support.
According to another embodiment of the invention, the composition is characterized in that it also comprises fluorine atoms.
The invention also relates to a first process for the preparation of a composition of the above type, which is characterized in that the support, a zinc precursor, aqueous ammonia and/or an ammonium salt and, if necessary, a transparent oxide precursor and a fluorinating agent are placed in contact and the zinc compound is deposited on the support and, where appropriate, the transparent oxide is precipitated on the said support.
The invention also relates to a second process for the preparation of a composition of the above type, which is characterized in that the support is subjected to a fluorination treatment in a first stage, then, in a second stage, the said support thus treated, a zinc precursor, aqueous ammonia and/or an ammonium salt and, if necessary, a transparent oxide precursor are placed in contact and the zinc compound is deposited on the support and, where appropriate, the transparent oxide is precipitated on the said support.
The invention further relates to a third process for the preparation of a composition of the above type, which is characterized in that, in a first step, the support, a zinc precursor, aqueous ammonia and/or an ammonium salt and, if necessary, a transparent oxide precursor are placed in contact and the zinc compound is deposited on the support and, where appropriate, the transparent oxide is precipitated on the said support, then, in a second step, the fluorination treatment is carried out.
The invention moreover relates to a fourth process for the preparation of a composition of the above type, which is characterized in that, in a first step, the support and a transparent oxide precursor are placed in contact and the transparent oxide is precipitated on the said support, then, in a second step, the support thus obtained is placed in contact with a zinc precursor, aqueous ammonia and/or an ammonium salt and the zinc compound is deposited on the support.
Lastly, the invention relates to the use, as dye pigment, of a composition of the above type or as obtained by one of the processes of the type described above.
Other characteristics, details and advantages of the invention will emerge even more fully on reading the description which follows, as well a
REFERENCES:
patent: 4147212 (1979-04-01), Tisdale
patent: 4287257 (1981-09-01), Ohmatoi et al.
patent: 4331706 (1982-05-01), Kindrick
patent: 5348581 (1994-09-01), Chopin et al.
patent: 5401309 (1995-03-01), Chopin et al.
patent: 5501733 (1996-03-01), Macaudiere et al.
patent: 5755868 (1998-05-01), Macaudiere
Chemical Abstract and Derwent abstracts for DE 4404953, Aug. 1995.
Chemical Absttact citation 114:170,406, abstract for JP 2-307,475 A2, Dec. 1990.
Chemical Abstract citation 68:52991, fukui et al, "Hygienic Chemical Studies of Noxious Gasses. X. Improvement of Absorption Mixture and Examination of the Methylene Blue Method for Determination of Hydrogen Sulfide"; Eisei Kagaku, 13 (1), pp. 16-21, 1967 no month.
Busnot Sylvain
Macaudiere Pierre
Koslow C. Melissa
Rhodia Chimie
Seugnet Jean-Louis
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