Hitachi Chemical Company, Ltd.

Megumi Kodama

Takahiro Tokuyasu

Tetsurou Iwakura

Shouta Sugai

Provided is a winding core which has a cylindrical shape and on which an adhesive tape, formed by an adhesive layer formed on an elongated base film in the longitudinal direction of the base film, is wound as multiple layers, wherein the outer diameter of the winding core is a dimension in which a deviation amount of the adhesive layer in the circumferential direction of the winding core between adjacent inner and outer tape portions of the adhesive tape in the radial direction of the winding core becomes 55 mm or less when the adhesive tape is wound on the winding core.

Winding core and roll

The adhesive sheet of the invention comprises a resin composition containing (A) a high-molecular-weight component, (B1) a thermosetting component having a softening point of below 50&#xb0; C., (B2) a thermosetting component having a softening point of between 50&#xb0; C. and 100&#xb0; C. and (C) a phenol resin having a softening point of no higher than 100&#xb0; C., the composition containing 11 to 22 mass % of the (A) high-molecular-weight component, 10 to 20 mass % of the (B1) thermosetting component having a softening point of below 50&#xb0; C., 10 to 20 mass % of the (B2) thermosetting component having a softening point of between 50&#xb0; C. and 100&#xb0; C. and 15 to 30 mass % of the phenol resin having a softening point of no higher than 100&#xb0; C., based on 100 mass % of the resin composition.

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Ichihara, Japan

Megumi Kodama