초록 ▼

There is disclosed a method for the preparation of a homogeneous, physically stable dispersion of colloidal metal particles of a transition metal selected from the group consisting of ruthenium, rhodium, osmium and iridium, having a size in the range of from about 10 Angstrom units to about 200 Angs

There is disclosed a method for the preparation of a homogeneous, physically stable dispersion of colloidal metal particles of a transition metal selected from the group consisting of ruthenium, rhodium, osmium and iridium, having a size in the range of from about 10 Angstrom units to about 200 Angstrom units. The method comprises preparing a solution of a functional polymer in an inert solvent, and incrementally adding thereto a transition metal cluster compound at a temperature at which the transition metal cluster compound will become bound to the polymer and thermally decompose to produce elemental transition metal particles, the process being carried out in an inert atmosphere. Such dispersions may be used per se as catalysts, or may be used for the preparation of supported colloidal transition metal catalysts. The dispersions may also be used for the preparation of ablative optical recording media.

대표청구항 ▼

A method for the preparation of a homogeneous, physically stable colloidal elemental dispersion of a transition metal selected from the group consisting of ruthenium, rhodium, osmium and iridium comprising: (a) preparing a solution in an inert solvent of a functional polymer, the concentration of th

A method for the preparation of a homogeneous, physically stable colloidal elemental dispersion of a transition metal selected from the group consisting of ruthenium, rhodium, osmium and iridium comprising: (a) preparing a solution in an inert solvent of a functional polymer, the concentration of the polymer being below its critical entanglement concentration, to provide discrete reactive binding sites to which transition metal cluster compound molecules can become bound; (b) incrementally adding, at suitable time intervals, a labile transition metal cluster compound, the molecules of which rapidly become bound to the reactive sites of the polymer; (c) maintaining a temperature which is sufficiently high to decompose the polymer-bound transition metal cluster compound much more rapidly than any transition metal cluster compound which may remain unbound in the solution decomposes to metal; (d) continuing the addition of increments of transition metal cluster compound to yield colloidal transition metal particles of the desired size within the range of from about 10 Angstrom units to about 200 Angstrom units, the transition metal particles being bound to the polymer molecules; and (e) steps (b), (c) and (d) being carried out in an inert atmosphere. A homogeneous, physically stable colloidal elemental dispersion of a transition metal selected from the group consisting of ruthenium, rhodium, osmium and iridium, suitable for use as a catalyst, comprising colloidal transition metal particles having a particle size within the range of from about 10 Angstrom units to about 200 Angstrom units dispersed in an inert liquid and stabilized by the presence of a functional polymer to the reactive sites of which the transition metal particles are bound, said dispersion being prepared by the method of claim 1.