Method for producing film with adhesive, and film with adhesive

By forming and laminating pressure-sensitive adhesive layers with opposite thickness gradients, the method achieves a uniformly thick multilayered adhesive layer with reduced surface unevenness, addressing the thickness inconsistencies in existing production methods.

WO2026009517A1PCT designated stage Publication Date: 2026-01-08NITTO DENKO CORP
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Patent Information

Application Number
PCT/JP2025/013522
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-05
Filing Date
2025-04-02
Publication Date
2026-01-08

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    Figure JP2025013522_08012026_PF_FP_ABST
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Abstract

The present invention provides a method for producing a film with an adhesive which has a multilayered adhesive layer having a substantially uniform thickness. A multilayered adhesive layer 5 is formed by: using a slot die coater to apply a first adhesive onto a film, so that a first adhesive layer 51 which has a thickness that gradually decreases in the width direction is formed; using a slot die coater to apply a second adhesive onto another film, so that a second adhesive layer 52 which has a thickness that gradually decreases in the width direction is formed; and bonding the first adhesive layer 51 and the second adhesive layer 52 together such that a thicker end part of the first adhesive layer 51 overlaps with a thinner end part of the second adhesive layer 52, and a thinner end part of the first adhesive layer 51 overlaps with a thicker end part of the second adhesive layer 52.
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Citation Information

Patent Citations

  • Method for manufacturing pressure-sensitive adhesive tape and its equipment

    JP2002138259A

  • Multilayered adhesive layer, multilayered adhesive layer having separator and manufacturing method thereof, adhesive-type optical film, adhesive-type optical film having separator and manufacturing method thereof, and picture display unit

    JP2021143271A

  • Film and pressure-sensitive adhesive for use therein

    WO2004035665A1