Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Patent
1997-05-30
1999-01-19
Nazario-Gonzalez, Porfirio
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
106 1428, 106 1436, 106 3113, C07F 700, C04B 902
Patent
active
058615237
DESCRIPTION:
BRIEF SUMMARY
This application was filed as a request for U.S. examination under 35 U.S.C. .sctn.371 of International application No. PCT/EP95/03822 filed Sep. 26, 1995.
The invention relates to basic zirconium carboxylates, to a process for the preparation of such carboxylates, and to the use of the carboxylates as, inter alia, driers for paints and inks. The carboxylates may also find use as, for example, lubricant additives, fuel additives, or polymerization catalysts.
The use of metallic soaps, or driers, in drying oil compositions has been known for centuries The soaps accelerate the "drying" of unsaturated oils such as linseed oil or unsaturated synthetic resins such as alkyd resins used as, for example, the base for paints. The metal part of the soap is generally assumed to be the active part of the drier: it is believed that the metal catalyses oxidation and/or polymerization processes in the oil or unsaturated alkyd paint base. In view of this, it is generally desirable that the soap contains as high a proportion of metal as possible.
Among the metallic soaps commonly used as driers for, for example, paints and inks, are carboxylates of cobalt, manganese, calcium, lead, barium and zinc. U.S. Pat. No. 2,739,902 indicates that, under certain conditions, cobalt, manganese, calcium, and lead carboxylates used as driers can be replaced in part (in the case of the cobalt or manganese carboxylates) or entirely (in the case of the calcium and lead carboxylates) by zirconium carboxylates. Advantages said to arise from such replacement are reduction in costs, as compared with the use of cobalt and/or manganese carboxylates alone, or in toxicity, in the case of the lead compounds. The U.S. specification indicates that it is generally the practice to use as small an amount of driers as possible, not only because of economic considerations but also because it is known that a high content of driers in a surface coating is extremely detrimental to the ageing properties of the coating, causing embrittlement, discoloration, and peeling off of the coating film.
The U.S. specification indicates that suitable zirconium compounds are particularly zirconyl naphthenate, 2-ethyl hexanoate, tollate, and linoleate, and, generally, the salts of the zirconyl radical ZrO.sup.2+ with aliphatic straight or branched chain, saturated or unsaturated, monocarboxylic acids. The specification describes the preparation and use of zirconyl 2-ethyl hexanoate, which is said to exist in a monomeric form, in which the zirconium content of the solid product is 23.17%, or in a dimeric form, in which zirconium atoms are linked via an oxygen atom and in which the zirconium content of the solid product is 35.3%.
A metal soap for use as a drier for, for example, paints and inks, is normally incorporated in the paint or ink in the form of a solution or stable suspension in an organic solvent, such a solution or suspension typically having a metal content, in the case of zirconium carboxylates, of 6 to 12 wt. %.
While it is possible to prepare by direct methods solutions or suspensions of zirconium carboxylates having zirconium contents in the range indicated above, it would be advantageous to be able to prepare by direct methods more concentrated zirconium carboxylates (of acceptable viscosity) which could, if desired, be diluted before use to the desired concentration. The direct preparation of the carboxylates in more concentrated form (that is, preparation without a final concentration step) would make it possible to increase the production capacity of a given reactor, and to supply the zirconium carboxylates in a form in which they contain less solvent, which may in some cases make them easier to handle.
We are aware of commercially available solutions or suspensions of zirconium 2-ethyl hexanoate containing up to 24 weight % of zirconium. Any attempt to remove solvent from such solutions/suspensions, however, results in a highly viscous product, which is not suitable for direct incorporation in a paint or ink formulation. Further, it is not possible to pr
REFERENCES:
patent: 3036101 (1962-05-01), Tittle
Reyniers Sylvain Leontina Edmond
S'Jegers Karen
Exxon Chemical Patents Inc.
Loo Blossom E.
Nazario-Gonzalez Porfirio
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