公开(公告)号：US20230144464A1

公开(公告)日：2023-05-11

申请号：US17802756

申请日：2021-02-24

Applicant: NITTO DENKO CORPORATION

Inventor： Yosuke SHIMIZU ,  Naofumi KOSAKA ,  Ryoko ASAI ,  Kenta KUMAKURA

IPC: C09J133/08 ,  C09J11/06 ,  C08F220/18 ,  C08F220/20 ,  C08F226/10 ,  C08F2/48

CPC classification number: C09J133/08 ,  C08F2/48 ,  C08F220/20 ,  C08F220/1804 ,  C08F220/1806 ,  C08F226/10 ,  C09J11/06 ,  C09J2301/124 ,  C09J2301/302 ,  C09J2301/416 ,  C09J2301/502 ,  C09J2433/001

Abstract: Provided is a PSA sheet that can combine bonding reliability and peeling removability, and further can be peeled off without causing deformation or damage to the adherend in various peeling modes. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a water-peel strength of 2 N/10 mm or less. The PSA sheet further has a stress at 100 % elongation of less than 30 MPa as well as a multiplication product (σf-εf) of fracture stress σf (MPa) and fracture strain εf (%) of 250 or greater.

公开(公告)号：US20240392172A1

公开(公告)日：2024-11-28

申请号：US18696005

申请日：2022-09-21

Applicant: NITTO DENKO CORPORATION

Inventor： Yusuke TAKEDA ,  Satoshi HONDA ,  Kenta KUMAKURA ,  Naofumi KOSAKA

IPC: C09J133/04 ,  C09J7/38 ,  C09J11/08

Abstract: The present invention provides a pressure-sensitive adhesive composition having an excellent pressure-sensitive adhesive force to an adherend even in a high temperature, enabling peeling with a small peel force without any adhesive residue when brought into contact with warm water during peeling, and having a pressure-sensitive adhesive force and easy peelability. The pressure-sensitive adhesive composition according to the present invention contains: an acrylic polymer containing a structural unit of an alkoxy group-containing (meth)acrylate monomer as a main component and containing, with respect to 100 parts by mass of all components of monomer structural units, 1 to 40 parts by mass of a structural unit of a polymerizable monomer having a homopolymer Tg of 0° C. or higher; and a surfactant.

公开(公告)号：US20230312990A1

公开(公告)日：2023-10-05

申请号：US18040474

申请日：2021-07-13

Applicant: NITTO DENKO CORPORATION

Inventor： Naofumi KOSAKA ,  Yosuke SHIMIZU ,  Kenta KUMAKURA

IPC: C09J7/38

CPC classification number: C09J7/38 ,  C09J2203/318 ,  C09J2301/302 ,  C09J2301/416 ,  C09J2301/502 ,  C09J2301/312 ,  C09J2400/143

Abstract: To provide a separation method for a joined object for display device, by which PSA can be peeled off even when the PSA is tightly bonded to a member in the joined object. Provided is a method for separating a joined object for display device. In this method, the joined object comprises two members joined with a PSA comprising a hydrophilicity enhancer. The method comprises a step of peeling the PSA from the member by supplying steam towards the PSA.

公开(公告)号：US20240409788A1

公开(公告)日：2024-12-12

申请号：US18697099

申请日：2022-09-21

Applicant: NITTO DENKO CORPORATION

Inventor： Satoshi HONDA ,  Yusuke TAKEDA ,  Kenta KUMAKURA ,  Naofumi KOSAKA ,  Tomokazu TAKAHASHI

IPC: C09J7/38 ,  C09J11/06 ,  C09J133/10

Abstract: The present invention provides a pressure-sensitive adhesive composition having an excellent adhesive force when bonding to an adherend, having excellent peelability when subjected to batch heat treatments at a high temperature, and having both a high initial adhesive force and a low post-heating adhesive force. The pressure-sensitive adhesive composition according to the present invention contains: a material having a radically polymerizable functional group; and a thermal polymerization initiator that generates a radical, in which a content of the thermal polymerization initiator is 1.2 to 10 parts by mass with respect to 100 parts by mass of all components excluding the thermal polymerization initiator.