| Hoden Seimitsu Kako Kenkyusho Co., Ltd. Patent applications |
| Patent application number | Title | Published |
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| 20110165426 | AQUEOUS SOLUTION FOR BLACKENING CHEMICAL CONVERSION COATING OF ZINC OR ZINC ALLOY SURFACE AND METHOD OF FORMING BLACKENED ANTI-CORROSION COATING FILM USING THE AQUEOUS SOLUTION FOR THE CHEMICAL CONVERSION COATING - The present invention provides a chromium-free surface treating method capable of treating a surface of a metallic member having a surface of zinc or zinc alloy so as to provide good blackness and rust inhibitive performance, and an aqueous solution for chemical conversion coating that can be applied to the treatment method. The aqueous solution contains neither trivalent or hexavalent chromium ion, and contains 5-20 g of phosphate ions per liter, 0.1-3 g of divalent iron ions per liter, 1-10 g of divalent manganese ions per liter, and 1-3 g of nitrate ions per liter. The aqueous solution has a pH of 1-3. A black coating film of Fe | 07-07-2011 |
| 20110143130 | CHROMIUM-FREE METAL SURFACE TREATMENT AGENT - Provided is a chromium-free metal surface treatment agent excellent in rust inhibitive performance which can be used in a surface treatment of metal products, in particular, galvanized metal products. The metal surface treatment agent consists essentially of a siliceous binder solution comprising water and/or alcohol as a solvent, and the concentration of the silica component is 8 to 25% by weight. In particular, a metal surface treatment agent containing an alcoholic solution of alkoxysilane oligomer having a weight averaged molecular weight of 1000 to 10000, which is obtained by hydrolyzed condensation polymerization of alkoxysilane, can suppress the occurrence of white rusting for a long time. It is preferred that 3 to 25 parts by weight of a dispersed nano-sized titanium dioxide powder having an average primary particle size of not more than 70 nm, per 100 parts by weight of the silica component be suspended in the siliceous binder solution. The rust inhibitive performance of the metal surface treatment agent can be further improved by using an alcohol-soluble polyvinyl butyral resin and by adding a silane coupling agent having a vinyl or epoxy group as a functional group, in combination with a dispersed nano-sized powder of titanium dioxide. | 06-16-2011 |
| 20090169875 | CHROMIUM-FREE RUST-INHIBITIVE SURFACE TREATMENT AGENT FOR METAL PARTS WITH ZINC SURFACES AND METAL PARTS WITH ZINC SURFACES COATED WITH RUST-INHIBITIVE SURFACE COATED FILM - Disclosed is a chromium-free rust-inhibitive surface treatment agent to form a siliceous film that rarely cracks or peels off and yields an excellent rust-inhibitive performance on zinc surfaces of a metal part. The chromium-free rust-inhibitive surface treatment agent is an alcoholic solution of alkoxysilane oligomer having weight-averaged molecular weight of 1,000 to 10,000, and 2.5 to 15% of silicon in molecules of the alkoxysilane oligomer has been replaced with titanium. To prepare partly titanium-replaced alkoxysilane oligomer, titanium compound, in which about a half of alkoxy groups in titanium tetraalkoxide has been chelated, is reacted with tetraalkoxysilane monomer or alkoxysilane oligomer in the alcoholic solution. | 07-02-2009 |
