The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 01, 2015
Filed:
Sep. 20, 2011
Toru Imokawa, Tokyo, JP;
Takahiro Kubota, Tokyo, JP;
Etsuo Hamada, Tokyo, JP;
Masayasu Nagoshi, Tokyo, JP;
Toru Imokawa, Tokyo, JP;
Takahiro Kubota, Tokyo, JP;
Etsuo Hamada, Tokyo, JP;
Masayasu Nagoshi, Tokyo, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
The present invention provides a chromium-free surface treatment liquid which enables forming, on a metal material surface, a film excellent in corrosion resistance at bent portions of a steel sheet, solvent resistance, coating properties after alkaline degreasing, and sweat resistance. The surface treatment liquid contains a resin compound having a specific bisphenol skeleton, a cationic urethane resin emulsion, a silane coupling agent, an organic titanium chelate compound, a quadrivalent vanadyl compound, a molybdate compound, a fluorine compound, and water at predetermined proportions. The pH of the surface treatment liquid is in the range of 4 to 5.