Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Agency of Industrial Science and Technology Ministry of International

Toda Kogyo Corporation

Yukimichi Nakao

Kyoji Kaeriyama

Aizo Yamauchi

Shoei Fujishige

Nanao Horiishi

Tomoyuki Imai

Yoshio Suda

Mitsutoshi Masuda

Osamu Oze

Disclosed is a method for the preparation of a polymer-metal cluster composite material having usefulness as a non-linear optical material or high-modulus material. The method comprises bringing a polymeric resin into contact with vapor of a heavy metal compound such as an acetylacetonato complex compound of palladium, platinum or copper under a non-oxidizing atmosphere at a temperature higher than the glass transition temperature of the polymeric resin so that the metal compound vapor is dissolved into the polymeric resin in a glassy state and is in situ reduced into the form of an elementary metal forming clusters of the metal particles.

Method for the preparation of polymer-metal cluster composite

Proposed is a method for the preparation of an ionic polyhalogeno metal complex compound consisting of a tetraalkylammonium cation and a polyhalogeno metal anion, of which the metal is selected from those having an atomic valency of 1 and a coordination number of 2, those having an atomic valency of 3 and a coordination number of 4 and those having an atomic valency of 2 and a coordination number of 4. The method comprises the steps of: dissolving a tetraalkylammonium halide and elementary halogen in a stoichiometric proportion corresponding to the chemical composition of the desired complex compound in an organic solvent to form a solution; dissolving, in the solution, the metal in an amount larger than the stoichiometric amount so as to be dissolved in the solution forming the complex compound in the reaction mixture; removing the undissolved metal from the reaction mixture to give a solution of the complex compound; and isolating the complex compound from the solution.

Method for the preparation of a polyhalogeno metal complex compound

A method of solubilizing iodine in an aqueous medium is disclosed, which includes mixing the aqueous medium with iodine together with a polystyrene derivative having the recurring units of the formula ##STR1## wherein R represents an alkylene group having 1-4 carbon atoms and n is an integer of 2-20. An antiseptic composition includes an aqueous medium, the above polystryene derivative, and iodine dissolved in the aqueous medium.

Methods of solubilizing iodine in aqueous medium and aqueous antiseptic

A quaternary ammonium trihalide, a novel compound, represented by the formula:

Quaternary ammonium trihalide and method for dissolution of metal with

From an ore containing gold and silver, the gold and silver are extracted by a method which comprises pulverizing the ore and bringing the pulverized ore into contact with an elemental halogen, a halogenated salt, and an organic solvent thereby converting the gold and silver into polyhalogeno anionic complexes and consequently dissolving them in the organic solvent.

Method for extraction of gold and silver from ore with a solution

A metal is dissolved by a method which comprises establishing contact of the metal with a quaternary ammonium compound and a halogenated hydrocarbon or with a quaternary ammonium compound, a halogenated hydrocarbon, and a polar solvent.

Method for dissolution of metal

A metal is dissolved by being brought into contact with at least one halogenated hydrocarbon in the presence of a cationic surfactant.

Disclosed herein is a process for producing electroconductive fibrous shaped-articles comprising the steps of:

Process for producing electroconductive fibrous shaped-articles

Nickel boride colloid useful as a catalyst for the hydrogenation of carbonyl compound is obtained by causing a nickel salt to react upon an alkali metal borohydride in an alcohol substantially free from dissolved oxygen under a non-oxidative atmosphere in the presence of an alcohol-soluble polymer.

Method for manufacture of nickel boride colloid

In an organic compound having a methlene group attached to a tertiary carbon atom thereof, preferential hydrogenation of the methylene group of the compound is effected by bringing hydrogen into contact with the compound in the presence of a nickel boride colloid.

Growing community of inventors

Tsukuba, Japan

Yukimichi Nakao