Try the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents. HANDBUCH DER PRAPARATIVEN ANORGANISCHEN CHEMI E. The English version of Volume II of Brauer's 'Handbook' follows the path. Handbuch der prap. Chemie [Handbook of Prepara- tive Chemistry), Part I, 2nd Ed., Stuttgart, 1921. Gentile and E. Handbuch der prparativen anorganischen Chemie Bd. II herausgeg. Ferdinand Enke Verlag Stuttgart 19602.

United States Patent Olfice 3,576,762 Patented Apr. 27, 1971 Int. Cos 23/14 US. 252431 16 Claims ABSTRACT OF THE DISCLOSURE There are provided polymerization catalysts especially useful for the polymerization of cyclic ethers.

These catalysts have the formula M O,,(OH) A wherein A is a carboxylic acid monovalent radical, M is a trivalent metal and n is a number comprised between and 10. These catalysts are produced by hydrolyzing a basic trivalent metal carboxylate, e.g. Basic iron (III) acetate, and then dehydrating the resultant hydrolyzed carboxylate.

Aluminum alcoholate or phenate may be added thereto. This application is a division of application Ser. 527,078, filed Feb.

14, 1966, and now Pat. 3,427,260 issued Feb. This invention relates to new polymerization catalysts and to a process for polymerizing alkylene oxides by means of these catalysts. More particularly the invention relates to the manufacture of polymerization catalysts from trivalent metal carboxylates and preferably also from an aluminium alcoholate. It is known that some trivalent metal carboxylates such as technical basic iron acetate may be used as catalysts in the polymerization of propylene oxide as described in Example of US. However with such catalysts, the reaction rate is extremely low, being 264 hours in said example. One object of this invention is to provide a process for polymerizing alkylene oxides at a high rate.

Another object is to provide such a process wherein a high yield of polymer is obtained. One further object is to provide such a process wherein a polymer of high intrinsic viscosity is obtained. One further object is to provide a new catalyst for this process. These and other objects as will be apparent from the following description and claims are obtained when there is used as catalyst a hydrolyzed and then dehydrated basic trivalent metal carboxylate. Trivalent transition metal carboxylates which are advantageously employed in the preparation of catalytic compositions are trinuclear metal carboxylates as described in Gmelins Handbuch der anorganischen Chemie, 8th edition, 52nd volume, p. Sandisk Memory Stick Pro Duo Driver Windows 7. 389, 58th volume, p. 704 and 59th volume, pp.

521 and 526 in G. Discourse And The Translator Hatim Pdf Merge. Brauer, Handbuch der prparativen anorganischen Chemie p. The carboxylate R(COO-) radical may be a radical derived from compounds containing carboxylic acid grouping(s) of the formula R(COOI-l) wherein R is any organic radical, more particularly a radical of an aliphatic, cycloaliphatic, or aromatic hydrocarbon; and n is the valency of the radical R, for example, 1 or 2 etc.

Examples of carboxylate containing compounds for examples include acetic, propionic, butyric, isobutyric, benzoic, toluic, succinic or ortho phthalic acid etc. The metal associated with the carboxylic radical preferably will be chosen among the trivalent metals having an atomic number of 21 to 27 in the periodic chart of the elements. As examples of these carboxylates, there are mentioned the monoacetate of the basic iron acetate complex of the formula [Fe (OAc) (OH) ](OAc) -2H O. Any other basic iron acetate may be also successfully used.

Such carboxylates will, for example correspond to the following formulas: wherein M is a metal preferably chosen from the group consisting of Sc, Ti, V, Cr, Mn and Fa, being intended that several metals may be present at the same time. A is a monovalent radical from a carboxylic acid i.e. The ratio of the number of molecules of acid to the number of acid functions in the molecule (for example 1 mole of a monocarboxylic acid, half a mole of a dicarboxylic acid and so on). X is an anion x is a number chosen from 0 to 10 y is an integer comprised between 0 and 5. By way of example, the following carboxylates may be used: The hydrolysis may be performed, for example, by heating the carboxylate in an inert organic liquid containing water. An amount of water comprised between 0.01 and times, preferably between 0.1 and 10 times by weight the amount of carboxylate is usually satisfactory. Among the diiferent liquids which may be used are acetone, ethanol, dioxane, tetrahydrofuran, chloroform, dichlorethane, toluene, xylene etc.