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US 5,312,480 AGranted
Gold(I) mercaptocarboxylic acid esters, method of their preparation and use
AssigneeDegussa AG
InventorsMarion Lotze, Hans Mehner
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AssigneeDegussa AG
InventorsMarion Lotze, Hans Mehner
Estimating the term…
Novel gold(I) mercaptocarboxylic acid esters of the formula (I) ##STR1## in which X is a C.sub.1 - to C.sub.3 alkylene group and Z is a group from the series tricyclo(5,2,1,0.sup.2.6)decane-8- or -9-yl or tricyclo(5,2,1,0.sup.2.6)decyl-3- or -4-methyl. These esters can be prepared from mercaptocarboxylic acid esters of the formula (II) ##STR2## and from a gold(I) chloride-dialkylsulfide complex. The novel esters can be used in gold preparations for gilding solid bases, especially ceramic materials. Compared to known gold(I) mercaptocarboxylic acid esters, the novel esters result in considerably shorter drying times for gold preparations.
A gold decorating composition for gilding solid bases, said composition comprising a gold(I) mercaptocarboxylic acid ester of the formula ##STR9## in which X is an alkylene group and Z an alkyl group, wherein X is a C.sub.1 - to C.sub.3 alkylene group and Z is selected from the group consisting of tricyclo(5,2,1,0.sup.2.6)decane-8- or -9-yl and tricyclo (5,2,1,0.sup.2.sub.0.6)decyl-3- or -4-methyl;
Dependencies are inferred from the claim text.
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Having the sulfur atoms of the thio groups bound to acyclic carbon atoms of the carbon skeleton: the carbon skeleton being acyclic and saturated
Comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28: mixtures of organic and…
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone: characterised by the material treated
Metallising , e.g. infiltration of sintered ceramic preforms with molten metal: ag or Au
Term ended 16 Dec 2011 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to novel gold(I) mercaptocarboxylic acid esters which are characterized by a tricycloalkyl group in the alcohol component of the ester. The present invention also concerns a method of preparing these new gold mercaptides and their use in gold preparations for gilding solid bases.
So-called gold preparations have long been used to apply a gold decoration onto ceramic articles and to produce strip conductors of gold in integrated circuits. Such preparations generally contain one or several sulfur-organic gold compounds soluble in an organic carrier medium, fluxing agents such as e.g. resinates of one or several of the elements B, Si, V, Cr, In, Sn, Sb, Bi, and Rh, and the carrier medium contains a resin and organic solvent. The gold preparations are applied onto the surface to be coated and after the evaporation of the solvent, a burning process follows at a temperature adjusted to the substrate and the gold preparation, during which the gold film is formed and fixed with good adhesion to the surface.
The sulfur-organic gold compounds have long been almost exclusively so-called gold sulforesinates which were obtained from a gold salt and sulfurized terpenes, especially naturally occurring terpenes. One disadvantage of these sulforesinates is that their preparation is associated with naturally occurring raw materials whose supply is limited and whose quality is subject to variations. In order to eliminate these disadvantages, and at the same time influence the properties of the gold preparations in a purposeful manner, purely synthetically prepared gold(I) mercaptides with very different structures have been used in the gold preparations.
The novel gold(I) mercaptides of the present invention are derivatives of mercaptoacetic acid, 2- and 3-mercaptopropionic acid, 2-, 3- or 4-mercaptobutyric acid, and 2-or 3-mercaptoisobutyric acid. On account of their ready availability, products based on mercaptoacetic acid (also called thioglycolic acid) and 2- or 3-mercaptopropionic acid are preferred.
The alcohol component of the ester, which component forms the base of the gold(I) mercaptides of the present invention, can exhibit one of the following structures: ##STR4##
Naturally, these alcohols can be present in the form of one of the possible stereoisomers. However, mixtures of isomers (positional and/or stereoisomers) can be conveniently used for preparing the gold(I) mercaptides of the present invention and the novel substances are also accordingly usually mixtures of isomers.