Adhesive tape for electronic parts and liquid adhesive
AssigneeTomoegawa Paper Co., Ltd.
InventorsOsamu Oka, Takeshi Nishigaya, Fumiyoshi Yamanashi
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Abstract
The present invention provide a novel polyimide which is soluble in organic solvents and excels in heat resistance, and to a process for producing the polyimide. The polyimide of the present invention comprises a repeating unit represented by the formula (1) and having a number average molecular weight of from 4,000 to 200,000. ##STR1## wherein X is --SO.sub.2 -- or --C(.dbd.O)--OCH.sub.2 CH.sub.2 O--C(.dbd.O)--, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
Claims19
An adhesive tape for electronic parts which comprises an adhesive layer composed of a polyimide resin comprising a repeating unit represented by the formula (1), provided on at least a surface of a heat resistant film:
- ##STR11## wherein X is --SO.sub.2 -- or --C(.dbd.O)--OCH.sub.2 CH.sub.2 O--C(.dbd.O)--, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
An adhesive tape for electronic parts which comprises an adhesive layer composed of a polyimide resin comprising a repeating unit represented by the formula (1), provided on at least a surface of a release film:
- ##STR17## wherein X is --S0.sub.2 -- or --C(.dbd.O)--OCH.sub.2 CH.sub.2 O--C(.dbd.O)--, and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.