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. 10, 1998
Filed:
Aug. 28, 1996
Osamu Oka, Shizuoka, JP;
Takeshi Nishigaya, Shizuoka, JP;
Tomoegawa Paper Co., Ltd., Tokyo, JP;
Abstract
This invention provides an adhesive tape and a liquid adhesive for electronic parts having sufficient thermal resistance and reliability. The adhesive tape of the invention comprises an adhesive layer composed of at least a polyimide selected from (I) a polyimide comprising the repeating unit represented by the following formula (1), (II) a polyimide comprising the repeating unit represented by the following formula (2), and (III) a polyimide comprising the repeating units represented by the following formulas (1) and (2) in a suitable proportion, provided on at least one surface of a heat resistance film or on a surface of a release film: ##STR1## wherein Ar is a divalent group having aromatic rings, Ra is a divalent group having 2 to 6 benzene rings; Rb is an alkylene group having 2 to 20 carbon atoms, a specific ether group or a specific dimethylsiloxane group: X.sup.1 is NH, NR (R is a C.sub.1 -C.sub.4 alkyl group or alkoxy group) or S; and X.sup.2 is NH, NR (R is a C.sub.1 -C.sub.4 alkyl group or alkoxy group), ##STR2## or S.