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:
Sep. 25, 1990
Filed:
Dec. 01, 1989
Kenshi Saeki, Kurashiki, JP;
Takao Ogino, Hiratuka, JP;
Noriaki Yoshitake, Hiratsuka, JP;
Takumi Honda, Hiratsaka, JP;
Akira Nishihara, Yokohama, JP;
Hiroshi Okita, Yokosuka, JP;
Yukio Tsuge, Ebina, JP;
Haruo Iizuka, Atugi, JP;
Nihon Parkerizing Co., Ltd., Tokyo, JP;
Mitsubishi Kasei Corporation, Tokyo, JP;
Abstract
The present invention relates to a process for surface treatment for cathodic electrodeposit coating of a zinc-plated or zinc alloy-plated steel sheet comprising coating and drying a protective coating material on said steel sheet chromate-treated beforehand, to form a protective film before subjecting the sheet to the cathodic electrodeposit coating, which comprises coating a protective coating material having as a principal constituent of film-forming organic component a block isocyanate-containing prepolymer containing in one and the same molecule respectively at least one blocked isocyanate group, hydroxyl group, and tertiary amono group and containing 10-100 parts by weight of silica sol relative to 100 parts by weight of said prepolymer, in an amount of 0.3 g-4 g/m.sup.2, and then heat-drying the same.