摘要 |
PROBLEM TO BE SOLVED: To obtain the subject adhesive tape that can increase the adhesion strength of the pressure-sensitive adhesive up to the structural bonding strength in no need of any heater or solvent by using a reactive polyurethane polymer including a filler and coating the base material with a pressure-sensitive adhesive on both surfaces. SOLUTION: (A) A viscoelastic base material that is reactive to crosslink with moisture (preferably a reactive polyurethane polymer filled with a filler) is coated with (B) a pressure-sensitive tackifier adhesive composition (preferably an aqueous dispersion of an acrylate copolymer or other aqueous dispersion of a pressure-sensitive adhesive) on its both surfaces. This adhesive tape is produced by feeding the component A into the middle dice slot in the 3-layered dice with a main extruder, then feeding the component B into the upper and lower dice heads with a sub extruder, drying these materials, when necessary, applying peeling paper or peeling film thereto, then cutting and packaging them.
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