Nitto-Denko Corporation

Koichi Ikeda

Hiroshi Wada

Hiroyuki Watanabe

Masahiro Ohura

Kenji Furuta

Yutaka Tosaki

Michio Umeda

Yoshikazu Soeda

Junji Yokoyama

Hironori Tamai

Naoki Nakayama

Rie Nakahira

Yoshihisa Furuta

Tsubasa Ueda

A pressure-sensitive adhesive sheet according to the present invention includes a base including a metal layer, a first plastic film layer A, and a second plastic film layer B and a pressure-sensitive adhesive layer on a surface of the second plastic film B. The metal layer is positioned between the first plastic film layer A and the second plastic film layer B. The metal layer has a thickness of 2 &#x3bc;m to 15 &#x3bc;m. A total of a thickness Ta of the first plastic film layer A and a thickness Tb of the second plastic film layer B is within a range of 25 &#x3bc;m to 70 &#x3bc;m.

Pressure-sensitive adhesive sheet and magnetic disk drive

The present invention relates to a pressure-sensitive adhesive tape or sheet having a light-reflective property and/or a light-shielding property, which includes a base material and at least one pressure-sensitive adhesive layer disposed on at least one surface of the base material. The pressure-sensitive adhesive layer is formed by an acrylic pressure-sensitive adhesive composition containing an acrylic polymer (a) and a low-molecular weight polymer component (b) which contains, as a principal monomer component, an ethylenic unsaturated monomer having a glass transition temperature of from 60 to 190&#xb0; C. when it is formed into a homopolymer and having a cyclic structure within the molecule thereof, and which has a weight-average molecular weight equal to or higher than 3,000 but lower than 20,000. The pressure-sensitive adhesive layer has a gel fraction of from 51 to 75 wt % and a temperature, at a maximum of loss tangent (tan &#x3b4;), of from &#x2212;14 to 25&#xb0; C.

Pressure-sensitive adhesive tape or sheet having light-reflective property and/or light-shielding property, and liquid crystal display apparatus

Disclosed is a double-faced pressure-sensitive adhesive tape which includes a foam substrate, one pressure-sensitive adhesive layer arranged on or above one side of the substrate, and another pressure-sensitive adhesive layer arranged on or above the other side of the substrate. The adhesive tape has a total thickness of 250 &#x3bc;m or less. The adhesive tape is thin but highly waterproof (sealable against water). The adhesive tape preferably has a tensile strength of 0.5 to 20 MPa for further superior processability.

Double-faced pressure-sensitive adhesive tape

Disclosed is a heat-activated adhesive sheet which includes a heat-activated adhesive layer, and two release liners arranged so as to sandwich and protect the heat-activated adhesive layer. One of the two release liners is a release liner containing a polyolefinic film as a base material, and the other is a release liner containing a polyester film as a base material. This heat-activated adhesive sheet has a transfer heat-activated adhesive layer, can thereby have a small thickness, is unlikely to suffer from 'unintended separation', and is unlikely to cause lifting and delamination of release liners when the sheet is stored as a roll.

Heat-activated adhesive sheet

Provided is an acrylic pressure sensitive adhesive composition excellent in pressure sensitive adhesive characteristics and removability and a pressure sensitive adhesive tape using the acrylic pressure sensitive adhesive composition. An acrylic pressure sensitive adhesive composition containing an acrylic polymer obtained by at least copolymerizing a (meth) acrylic acid alkyl ester with an alkyl group having 2 to 14 carbon atoms and a carboxyl group containing unsaturated monomer copolymerizable with the (meth) acrylic acid alkyl ester, and tackifier resins, wherein the tackifier resins are respective resins each containing a natural product as a raw material, include at least 4 kinds of the resins different in a molecular structure from one another and a content of each of the tackifier resins is in the range of 5 parts by weight or more and 20 parts by weight or less relative to 100 parts by weight of the acrylic polymer.

Acrylic pressure sensitive adhesive composition and pressure sensitive adhesive tape

Growing community of inventors

Ibaraki, Japan

Koichi Ikeda