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:
Apr. 29, 2003
Filed:
May. 12, 2001
Masahiro Kojima, Tochigi, JP;
Takashi Sudo, Tochigi, JP;
Shintaro Nakagawa, Tochigi, JP;
Masahiko Matsukawa, Tokyo, JP;
Toshio Inbe, Kanagawa, JP;
Tatsuo Yoshida, Tokyo, JP;
Other;
Abstract
A treatment method for hydrophilicity for a heat exchanger which can maintain the deodorizing property and hydrohilicity even after a long-time use, and a heat exchanger thus treated for hydrophilicity by said method are provided. After a previous acidic washing treatment, a heat exchanger is subjected to a chemical transformation treatment to form a chemical conversion coating film using a chromium chromate treatment agent, chromium phosphate treatment agent, or treatment agent of zirconium series, followed by a treatment for hydrophilicity using a treatment agent for hydrophilicity, which contains silica particulates and polymer of vinyl alcohol series in aqueous medium in a weight ratio 30:70˜70:30 and in tot al content of 1˜25 weight percent, and in which said silica particulates are coated with said polymer of vinyl alcohol series, and dispersed as coated particles of the average particle diameter of 5˜1000 nm in aqueous medium, to form the coating film so as to amount to 1˜3 g/m .