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公开(公告)号：EP4365221A1
公开(公告)日：2024-05-08
申请号：EP22833165.8
申请日：2022-06-28
Applicant: Nitto Denko Corporation
Inventor： YAMADA, Yosuke , YAMAMOTO, Akiyoshi , NOMURA, Takayuki
IPC: C08J3/00 , B29B17/00 , C08J11/08 , C08L33/02 , C09J133/00
Abstract: Provided are a method for producing a water-soluble polymer in which a water-soluble polymer can be produced from a pressure-sensitive adhesive as waste under a mild condition, a method for producing a water-absorbent polymer in which a water-absorbent polymer can be produced from a pressure-sensitive adhesive under a mild condition, a water-soluble polymer that can be produced from a pressure-sensitive adhesive, and a water-absorbent polymer that can be produced from a pressure-sensitive adhesive. A method for producing a water-soluble polymer according to an embodiment of the present invention includes bringing a pressure-sensitive adhesive treatment liquid which contains a liquid having a Hansen solubility parameter value of 31 or less and an alkaline compound and in which a concentration of the alkaline compound in the pressure-sensitive adhesive treatment liquid is from 0.001 wt% to 20 wt%, into contact with a pressure-sensitive adhesive.
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公开(公告)号：EP4174123A1
公开(公告)日：2023-05-03
申请号：EP21832393.9
申请日：2021-06-25
Applicant: Nitto Denko Corporation
Inventor： YAMAMOTO, Akiyoshi , NOMURA, Takayuki , NISHIBE, Takeshi , YAMADA, Yosuke
IPC: C08J11/08 , C09J201/00 , C11D7/06 , C11D7/50 , C09J7/38
Abstract: Provided are a pressure-sensitive adhesive treatment liquid, which can easily remove various kinds of pressure-sensitive adhesives, and a pressure-sensitive adhesive treatment method by which the various kinds of pressure-sensitive adhesives are easily removed. For example, when a pressure-sensitive adhesive tape including a base material and a pressure-sensitive adhesive is used as a treatment object, there are provided a pressure-sensitive adhesive treatment liquid, which can easily separate the base material and various kinds of pressure-sensitive adhesives from each other, and a pressure-sensitive adhesive treatment method by which the base material and the various kinds of pressure-sensitive adhesives are easily separated from each other. A pressure-sensitive adhesive treatment liquid according to an embodiment of the present invention is a treatment liquid for a pressure-sensitive adhesive, and includes a liquid having a Hansen solubility parameter value of 31 or less, and an alkaline compound. The concentration of the alkaline compound is from 0.001 wt% to 20 wt%.
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公开(公告)号：EP4316732A1
公开(公告)日：2024-02-07
申请号：EP22780430.9
申请日：2022-03-23
Applicant: Nitto Denko Corporation
Inventor： YAMADA, Yosuke , YAMAMOTO, Akiyoshi , NOMURA, Takayuki
Abstract: Provided is a pressure-sensitive adhesive tape processing method capable of easily separating a base material and a pressure-sensitive adhesive for forming a pressure-sensitive adhesive tape from each other at low cost. Furthermore, a pressure-sensitive adhesive tape processing device used for such a pressure-sensitive adhesive tape processing method is provided. The pressure-sensitive adhesive tape processing method according to an embodiment of the present invention is a method for processing a pressure-sensitive adhesive tape including a base material layer and a pressure-sensitive adhesive layer, a storage modulus of the base material layer at 25°C is 2 MPa or more, and the pressure-sensitive adhesive tape processing method includes a step (I) of separating a pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer, from the base material layer, by grinding a surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape.
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