To solve problems in a pressure sensitive adhesive that it is impossible to closely plaster the conventional pressure sensitive adhesive on a substrate since a re-plastering property is preferential and then the pressure sensitive adhesive member has Usually poor tackiness (initial adhesive force) and poor adhesive force, that easiness and workability of plastering are decreased since bubbles are easily included during plastering and that it is impossible to obtain both properties since the easiness of plastering is decreased as long as the re-plastering property is preferential.
A heat foamable pressure sensitive adhesive is obtained by compounding a foaming agent with a pressure sensitive adhesive having a peeling force to the substrate of not more than 3.0 N/25 mm at an ambient temperature, a shearing adhesive force of not less than 98 N/cm2 and a dynamic modulus of 1 to 1,000 N/cm2 heated at 150 to 200°C wherein the adhesive force is decreased or varnished due to swelling or foaming of the foaming agent during heating. A pressure sensitive adhesive tape is obtained by use of the heat foamable adhesive agent.
YAMASHITA MASAMI
OSHIMA HIROAKI
