Lintec Corporation

Yusuke Matsuoka

Kiichiro Kato

Kazue Uemura

Takamasa Kase

Yumiko Amino

Koji Tsuchibuchi

A pressure sensitive adhesive sheet including, on a substrate or a release material, a resin layer, at least a surface (&#x3b1;) of the resin layer on the opposite to the side on which the substrate or release material is provided having pressure sensitive adhesiveness, wherein a concave portion and a flat face exist on the surface (&#x3b1;) of the resin layer, and a width of the concave portion observed from the side of the surface (&#x3b1;) is non-uniform, and in a region (D) of 8 mm in length&#xd7;10 mm in width as freely-selected on the surface (&#x3b1;), a concave portion having an area of 70 to 99.99% relative to 100% of a total area of the concave portions existing in the region (D) exists.

Adhesive sheet and method for producing adhesive sheet

Provided is a pressure sensitive adhesive sheet including a resin layer on a substrate or a release material, at least a surface (&#x3b1;) of the resin layer on the side opposite to the side thereof on which the substrate or the release material is provided having pressure sensitive adhesiveness, wherein a concave portion and plural flat faces having an irregular shape exist in a region (Dc) surrounded by an arbitrarily predetermined circle on the surface (&#x3b1;) of the resin layer; and with respect to one or more flat faces (S) among the plural flat faces, the one or more flat faces (S) excluding flat faces having a cumulative relative frequency of 30% or less determined by adding the relative frequency from the respective flat faces with a smaller area, an rvalue of the flat faces (S) calculated from specified operations is 0.60 or less.

Growing community of inventors

Tatsuno, Japan

Yusuke Matsuoka