Lintec Corporation

Sharp Corporation

Takehito Nakayama

Kazuya Katoh

Masaki Yamamoto

Hideharu Tajima

Hirohisa Yamada

Yasuhiro Harada

Naoki Taya

Takuya Hayasaka

Jun Akiwa

A pressure-sensitive adhesive sheetfor an optical data recording medium Dfrom which a signal with a mark length shorter than the resolution limit of an optical system of a reproducing device is capable of being reproduced by reproduction light emitted during reproducing, the pressure-sensitive adhesive sheethaving an adhesive transparent resin layerto be disposed on an data recording layerof the optical data recording medium D, the transparent resin layerhaving a (meth)acrylate copolymer containing no acidic group as a main component, the transparent resin layerhaving a storage elastic modulus at 23&#xb0; C. of 1.5&#xd7;10Pa or less and a gel fraction of 68 wt % or more. The transparent resin layerof this pressure-sensitive adhesive sheetfor an optical data recording medium can be used for producing an optical data recording medium which can reproduce from a mark with a length shorter than the resolution of an optical system of a reproducing device, and which is stable against changes in the external environment when responding to status of use.

Pressure-sensitive adhesive sheet for optical data recording medium, optical data recording medium, and method and device for reproducing data from optical data recording medium

A laminate is produced in which a long release sheetA, an adhesive layerA and a base materialA are laminated together, and the base materialA and the adhesive layerA are cut (half cut) so as not to penetrate through the release sheetA, so as to divide the base materialA and the adhesive layerA into cover sheet portionsA, bolstering portionsA and a remainder portionA. The remainder portionA is then peeled off and removed, and an outer end portion of each of the bolstering portionsA is half cut so as not to penetrate through the release sheetA, raised portionsA being formed through the half cutting. The laminate sheet can be produced at low cost, and defects can be prevented from being formed on the adhesive sheet when the laminate sheet is wound into a roll.

Laminate sheet and laminate sheet roll

An adhesive sheetA having a predetermined form is laminated onto a long release sheetA, and a protective memberA which is thicker than the adhesive sheetA is provided in a position so as not to overlap the adhesive sheetA when a laminate sheetA is wound into a roll. According to this laminate sheetA, defects can be prevented from forming on the adhesive sheetA when the laminate sheetA is wound into a roll.

Laminate sheet, laminate sheet roll, and producing methods therefor

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Tokyo, Japan

Takehito Nakayama