Patent ID: 6045886
Filing Date: 2000-04-04
Classification: C08L,C09J,H01L,Y10T

Abstract:
In an adhesive tape for electronic parts comprising two adhesive layers provided on both sides of a substrate, the improvement comprising that two adhesive layers are resin layers composed of 100-40% by mol of at least a polyimide comprising at least one of the repeating units represented by the following formulas (1a) and (1b) and 0-60% by mol of at least one of the repeating units represented by the following formulas (2a) and (2b), said two adhesive layers having each a different glass transition temperature: ##STR11## wherein Ar represents a divalent group selected from the following formulas containing aromatic rings: ##STR12## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 which may be identical or different represent each a hydrogen atom, an alkyl group having 1-4 carbon atoms or an alkoxy group having 1-4 carbon atoms, provided that R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are not hydrogen atoms at the same time, ##STR13## wherein R is an alkylene group having 1 to 10 carbon atoms or --CH.sub.2 OC.sub.6 H.sub.4 --, the methylene group of which attaches to Si, and n means an integer of 1 to 20.