Nitto-Denko Corporation

Tomoko Kishimoto

Yukio Arimitsu

Akihisa Murata

Disclosed is a heat-peelable pressure-sensitive adhesive sheet that can prevent the deformation of a pressure-sensitive adhesive layer due to pressurization in a pressing process and can be easily peeled off from the processed article. The heat-peelable pressure-sensitive adhesive sheet includes a substrate, and a heat-expandable pressure-sensitive adhesive layer arranged on or above at least one side of the substrate and containing a foaming agent, in which the heat-expandable pressure-sensitive adhesive layer has a shear modulus (23&#xb0; C.) in an unfoamed state of 7&#xd7;10Pa or more. The heat-expandable pressure-sensitive adhesive layer preferably has a shear modulus (95&#xb0; C.) in an unfoamed state of less than 7&#xd7;10Pa. The foaming agent in the heat-expandable pressure-sensitive adhesive layer preferably has a foam initiating temperature higher than 80&#xb0; C.

Heat-peelable pressure-sensitive adhesive sheet and method for processing adherend using the heat-peelable pressure-sensitive adhesive sheet

Disclosed is a thermal-release double-coated pressure-sensitive adhesive tape or sheet which includes a substrate, a foaming agent-free pressure-sensitive adhesive layer (A) arranged on one side of the substrate, and a foaming agent-containing pressure-sensitive adhesive layer (B) arranged on the other side. The pressure-sensitive adhesive layer (A) contains 5 to 30 parts by weight of a plasticizer and 100 parts by weight of a base polymer and has a tensile adhesive strength of 1 N/20 mm in width or less with respect to a poly(ethylene terephthalate) film as determined at a peel angle of 180 degrees, a rate of pulling of 300 mm/minute, a temperature of 23&#xb1;2&#xb0; C., and a relative humidity of 65&#xb1;5%. The weight loss of plasticizer is 2 percent by weight or less when the tape or sheet is heated at a temperature of 165&#xb0; C. and a pressure of one atmosphere for one hour.

Growing community of inventors

Ibaraki, Japan

Tomoko Kishimoto