Electrically peelable adhesive composition and electrically peelable pressure sensitive adhesive sheet, and method for using electrically peelable pressure sensitive adhesive sheet

An electrically peelable pressure sensitive adhesive composition, comprising:

• an acrylic copolymer (A) comprising 10 to 99 mass % of a constituent unit (a1) derived from a compound of the formula (a1);
• and
• a surfactant (B), which is a compound of the formula (b1),
• wherein R1 represents a hydrogen atom or a methyl group, R2 represents unsubstituted or substituted alkylene group having 1 to 5 carbon atoms, and R3 represents unsubstituted or substituted alkyl group having 1 to 8 carbon atoms;
• and n is an integer 1 or more,
• RaORbOmSO3−X+ (b1),
• wherein Ra represents any of unsubstituted or substituted alkyl group having 1 to 18 carbon atoms, unsubstituted or substituted cycloalkyl group having 3 to 18 ring carbon atoms, unsubstituted or substituted alkenyl group having 1 to 18 carbon atoms, unsubstituted or substituted cycloalkenyl group having 3 to 18 carbon atoms, and unsubstituted or substituted aryl group having 6 to 24 ring carbon atoms;
• Rb represents unsubstituted or substituted alkylene group having 1 to 10 carbon atoms;
• X+ represents an ammonium ion;
• and m represents an integer of 1 or more,
• wherein the content of the surfactant (B) is 40 to 130 parts by mass based on 100 parts by mass of the acrylic copolymer (A).