METHOD FOR MANUFACTURING DOUBLE-SIDED PRESSURE-SENSITIVE ADHESIVE TAPE

PROBLEM TO BE SOLVED: To manufacture a double-sided pressure-sensitive adhesive tape having different adhesiveness between the front and the rear by a simple method.SOLUTION: This double-sided pressure-sensitive adhesive tape is manufactured as follows: a first photocurable pressure-sensitive adhesi...

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1. Verfasser: ARAKI NOBORU
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To manufacture a double-sided pressure-sensitive adhesive tape having different adhesiveness between the front and the rear by a simple method.SOLUTION: This double-sided pressure-sensitive adhesive tape is manufactured as follows: a first photocurable pressure-sensitive adhesive composition having prescribed viscosity is applied onto a peeling film to form a first photocurable pressure-sensitive adhesive composition layer; a base material tape is laminated, and a second photocurable pressure-sensitive adhesive composition having higher viscosity by 2,000-5,000 mPa s than the first photocurable pressure sensitive adhesive composition is applied to form a second photocurable pressure-sensitive adhesive composition layer; and a cover film is laminated and the laminated tape is obtained, and an ultraviolet ray is irradiated from one surface or both surfaces thereof to optically cure the first photocurable pressure-sensitive adhesive composition layer and the second photocurable pressure-sensitive adhesive composition layer, and to thereby obtain a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer. In this case, the first photocurable pressure-sensitive adhesive composition is impregnated into the base material tape from one surface of the base material tape, and the second photocurable pressure-sensitive adhesive composition is impregnated into the base material tape from other surface, and the layer thickness of the first pressure-sensitive adhesive layer is adjusted to be 25-200 μm, and the layer thickness of the second pressure-sensitive adhesive layer is adjusted to be 25-200 μm, and the difference of each layer thickness of both layers is adjusted to be ≤20 μm.