Adhesive tape for electronic parts and liquid adhesive

An adhesive tape for electronic parts which comprises an adhesive layer provided on a surface of a release film, said adhesive layer being semi-cured into B-stage and composed of:

• (a) a piperazinylethylaminocarbonyl-containing butadiene-acrylonitrile copolymer having a weight average molecular weight of 10,000-200,000, an acrylonitrile content of 5-50% by weight, and an amino equivalent of 500-10,000, represented by the following formula (I):
• ##STR10## wherein, k, m, and n are molar ratios and taking n as 1, k is a number of 3-175, and m is a number of 0.3 to 93;
• (b) a compound having at least two maleimide groups selected from the compounds represented by the following formulae (II-1) to (II-6):
• ##STR11## wherein p is an integer of from 0 to 7, ##STR12## wherein MI=maleimide group, R=H or CH.sub.3 and r=1-5, and (c) a diamine compound represented by formula (III):
• H.sub.2 N--R.sup.1 --NH.sub.2 (III)
• wherein R.sup.1 is a divalent aliphatic, aromatic, or alicyclic group,
• or an amino-containing polysiloxane having a weight average molecular weight of 200-7,000 represented by the formula (IV):
• ##STR13## wherein R.sup.2 is a divalent aliphatic, aromatic, or alicyclic group, and s is an integer of from 0 to 7,
• the sum of components (b) and (c) based on 100 parts by weight of component (a) being 10 to 900 parts by weight, and the mol equivalent of the maleimide group in component (b) per mol equivalent of the amino group in component (c) being 1 to 100 mol equivalent, and said adhesive layer being composed of at least two semi-cured layers which are cured into a B-stage and have each a different status of semi-cure.