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:
Mar. 12, 1996
Filed:
May. 09, 1994
Hirohiko Hirao, Marugame, JP;
Yoshimasa Kikukawa, Marugame, JP;
Toshihiro Okamoto, Marugame, JP;
Takayuki Murai, Marugame, JP;
Seiji Sogabe, Marugame, JP;
Miya Tanioka, Marugame, JP;
Rie Nakayama, Marugame, JP;
Takashi Yoshioka, Marugame, JP;
Shikoku Chemicals Corporation, Marugame, JP;
Abstract
An water-based surface treatment agent used for the copper on a printed wiring board (PWB). Chemical layer formed on PWB shows excellent heat-resistance and moisture-resistance; therefore, the treated PWB preserves excellent soldability for a long time. The water-based surface treatment agent contains, as an active ingredient, a 2-arylimidazole compound represented by the following formula, ##STR1## wherein R is a hydrogen atom or a methyl group, R1 and R2 are hydrogen atoms, lower alkyl groups or halogen atoms, and R3 and R4 are hydrogen atoms, lower alkyl groups, halogen atoms, lower alkoxy groups, di-lower alkylamino groups, cyano groups or nitro groups, ##STR2## wherein R is a hydrogen atom or a methyl group, and R1 and R2 are hydrogen atoms, lower alkyl groups or halogen atoms, but excluding the case where R, R1 and R2 are all hydrogen atoms.