Nitto-denko Corporation

Masataka Nishiwaki

Yasushi Buzojima

Kenta Jozuka

Ryo Morioka

Kazuki Minoura

Hiroki Kigami

Naohiro Kato

Midori Segawa

Toshiki Ikami

Provided is a PSA sheet having limited light transmission, an increased refractive index and good adhesive properties. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a total light transmittance below 80%. The PSA layer has a first face and a second face on the opposite side to the first face. The PSA layer comprises high-refractive-index particles. In the PSA layer, the high-refractive-index particles are concentrated in a range that extends from the first face towards the second face side and has a thickness of at least 100 nm, accounting for less than 50% of the PSA layer thickness.

Pressure-sensitive adhesive sheet

The invention provides a PSA sheet having a PSA layer exhibiting superior light shielding. Provided is a PSA sheet comprising a PSA layer that includes a PSA polymer. Carbon black particles are dispersed in the PSA layer. The average particle size of the carbon black particles dispersed in the PSA layer is 300 nm or smaller. The average particle size is an average particle size determined on the basis of a number-based particle size distribution by TEM observation.

Provided is a PSA sheet that can be processed with excellent precision while providing excellent light-blocking properties in an in-plane direction and in the thickness direction in an embodiment where the support substrate has a limited thickness. The PSA sheet has a support substrate having a thickness less than 75 &#x3bc;m and a PSA layer placed at least on one face of the support substrate. The PSA sheet has light transmittances of 0.04% or lower in XY and Z directions thereof.

Liquid crystal display and pressure-sensitive adhesive sheet

Provided is a pressure-sensitive adhesive (PSA) sheet including a PSA layer formed from a PSA composition including a base polymer, crosslinking agents of two or more species having mutually different types of crosslinkable functional groups, and an azole-based rust inhibitor. Here, one of the crosslinking agents of two or more species is an isocyanate-based crosslinking agent. Monomeric components constituting the base polymer include a carboxy group-containing monomer. The amount of the azole-based rust inhibitor in the PSA layer is less than 8 parts by weight with respect to 100 parts by weight of the base polymer.

Growing community of inventors

Ibaraki, Japan

Masataka Nishiwaki