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. 31, 1992
Filed:
Dec. 19, 1989
Makoto Yanagawa, Kamifukuoka, JP;
Shinji Santo, Tokorozawa, JP;
Tamura Kaken Co., Ltd., Saitama, JP;
Abstract
The present invention provides a photopolymerizable composition useful as a liquid photoimageable solder mask comprising (a) a reaction product obtained by reacting epoxy resin A containing at least two terminated epoxy groups with 0.8 to 1.2 mol, per 1 epoxy equivalent of epoxy resin A, of an .alpha.,.beta.-unsaturated carboxylic acid and then reacting same with 0.2 to 1.0 mol, per 1 epoxy equivalent of epoxy resin A, of polybasic acid anhydride, (b) diluent, (c) sensitizer, (d) epoxy resin B consisting of tris (2,3-epoxypropyl) isocyanurate whose melting point is 130.degree. C. or less, and (e) an epoxy resin curing agent represented by the general formula [I:] ##STR1## wherein R is --H, halogen, --NH.sub.2, --SH, aromatic hydrocarbon, a C.sub.1 -C.sub.4 alkyl group or NHR' (R' is a C.sub.1 -C.sub.4 alkyl group having --CN or NH.sub.2 C.dbd.NH).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile