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US 5,599,588 AGranted
Process for preparing metal halides by the sol-gel-method
AssigneeEastman Kodak Company
InventorOliver J. C. Poncelet
Life of this patent
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Abstract
The present invention concerns a process for obtaining metal halides, in particular rare earth and/or alkali earth halides. This process consists of forming a homogeneous solution by mixing one or more rare earth and/or alkali earth halogenoalkoxides in an anhydrous organic solvent, and hydrolyzing this solution. The novel materials are obtained at room temperature and are in powder, fibre, film or bulk material form.
Claims10
Process for preparing rare earth and/or alkaline earth metal halides which comprises:
- (1) forming a homogeneous solution by mixing an alkoxide species in an anhydrous organic solvent, said alkoxide species consisting of rare earth and/or alkaline earth halogenoalkoxides corresponding to one of the following formulae:
- M(ORx).sub.n (ORy).sub.m
- or
- M(ORx).sub.n X.sub.m
- wherein M is a rare earth or an alkaline earth, Rx and Ry are each separately alkyl groups substituted by at least a halogen atom, X is a halogen and n and m are such that the sum of n and m is equal to the valency of M, provided that n is higher than 0;
- and
- (2) adding to this solution a quantity of water which is at least stoichiometric for hydrolyzing the halogenoalkoxides to form a gel consisting essentially of rare earth and/or alkaline earth metal halides.
4 more elements
Dependencies are inferred from the claim text.