Nitto-denko Corporation

Naoaki Higuchi

Kenta Jozuka

Makoto Saito

Masayuki Okamoto

Masahito Niwa

Yasushi Buzojima

Yusuke Yamanari

Kenji Furuta

Yoshikazu Soeda

Shuuhei Yamamoto

Naoki Nakayama

Naohiro Kato

Provided is a PSA sheet capable of suitably preventing bubble formation caused by outgassing. This invention provides a PSA sheet comprising a PSA layer that forms an adhesive face. In an aging test where the adhesive face is press-bonded to a glass plate and stored at 50&#xb0; C. for 24 hours, the PSA sheet has at least 5% post-aging non-bonding area Sa, with Sa defined as the ratio of all areas non-bonding to the glass plate relative to the total area of the adhesive face. The non-bonding areas have parts linearly extending along the adhesive face.

Pressure-sensitive adhesive sheet

Provided is a PSA sheet highly durable against repeated deformation and suited for use in a flexible device as well. The PSA sheet provided by this invention comprises a PSA layer. The PSA sheet shows a recovery rate at 100% elongation of 70% or higher. The PSA layer shows a displacement of 0.5 mm or greater according to the following holding power test: &#x3c;Holding Power Test&#x3e; At 23&#xb0; C., the PSA layer is applied over a 10 mm wide by 20 mm long bonding area to a Bakelite plate as an adherend; a 1 kg load is applied in the length direction; after one hour, the displacement from the initial position where first applied is determined.

Provided is a pressure-sensitive adhesive tape excellent in unevenness followability. The pressure-sensitive adhesive tape of the present invention includes: a base material layer; and a pressure-sensitive adhesive layer arranged on at least one side of the base material layer, wherein the pressure-sensitive adhesive tape has a dimensional change ratio at 23&#xb0; C. of from 0.20 to 0.39.

Pressure-sensitive adhesive tape

The present invention provides an acrylic PSA composition. The acrylic PSA composition comprises an acrylic polymer as its base polymer and at least one species selected among tackifier resins and (meth)acrylic oligomers. The acrylic polymer has a weight average molecular weight higher than 70&#xd7;10. The acrylic polymer has a dispersity (Mw/Mn) below 15.

Acrylic pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet

Provided is a PSA sheet that provides highly reliable adhesion and great stretch removability from adherends. This invention provides a PSA sheet. The PSA sheet exhibits a shear adhesive strength of 0.5 MPa or greater, a tensile strength at break of 10 MPa or greater, and an elongation at break of 300% or greater.

Pressure-sensitive adhesive sheet for portable electronics

The present invention relates to a pressure-sensitive adhesive composition including, as a main ingredient, a monomer mixture or an acrylic copolymer material obtained by at least partially polymerizing the monomer mixture, the monomer mixture including: at least one monomer (monomer m1) selected from alkyl (meth)acrylates represented by the following formula (I) CH&#x2550;C(R)COORin which Ris a hydrogen atom or a methyl group, and Ris an alkyl group having 1 to 20 carbon atoms: at least one monomer (monomer m2) selected from N-hydroxyalkyl(meth)acrylamides represented by the following formula (II) CH&#x2550;C(R)CONHRin which Ris a hydrogen atom or a methyl group, and Ris a hydroxyalkyl group having 2 to 4 carbon atoms: and at least one monomer (monomer m3) selected from N-vinyl cyclic amides and (meth)acrylamides that may have an N-alkyl group; and the monomer mixture including substantially no carboxyl group-containing monomer.

Pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet, and method for producing the same

The present invention relates to a pressure-sensitive adhesive composition used for a pressure-sensitive adhesive sheet to be directly attached to a metal surface, the composition including, a monomer mixture or an acrylic copolymer material obtained by at least partially polymerizing the monomer mixture, the monomer mixture including: at least one monomer (monomer m1) selected from alkyl(meth)acrylates represented by the following formula (I): CH&#x2550;C(R)COORin which Ris a hydrogen atom or a methyl group, and Ris an alkyl group having 1 to 20 carbon atoms, and N-methylol (meth)acrylamide (monomer m2); in which the monomer m1 and the monomer m2 are contained in a total amount of 60% by weight or more based on the total amount of the monomer mixture, and the monomer mixture includes substantially no carboxyl group-containing monomer.

Growing community of inventors

Ibaraki, Japan

Naoaki Higuchi