Lintec Corporation

Sony Corporation

Shin Kubota

Takeshi Yamasaki

Kazuyoshi Ebe

Kazuya Katoh

Sou Miyata

Mamoru Kobayashi

Tomomi Yukumoto

Kazuyoshi Gbe

Takuya Okuda

A release sheet, on which a stamper receiving layer for producing an optical recording medium is laminated, comprising a release agent layer on a side to which the stamper receiving layer is laminated, wherein the release agent layer is formed using a release agent that contains an organopolysiloxane (other than an MQ resin below) containing an alkenyl group in the molecule, an MQ resin containing an alkenyl group and having, as constituent components, M units represented by formula (1)RR&#x2014;Si&#x2014;O&#x2014;&#x2003;&#x2003;(1) 

Release sheet for stamper-receiving layer, and optical recording medium-producing sheet

The present invention provides an optical disk producing sheet, obtained by laminating a stamper-receiving layerthat is energy rays-curable and whose storage elastic modulus prior to curing is from 10to 10Pa, and an adhesive layerwhose adhesive strength to polycarbonate is at least 200 mN/25 mm, and whose storage elastic modulus during the curing of the stamper-receiving layeris from 10to 10Pa. With the optical disk producing sheet, separation that occurs during the production of an optical disk, or during the storage of the finished product, is prevented, and warpage in the resulting optical disk is reduced.

Optical disk manufacturing sheet

A curable pressure sensitive adhesive composition is made to contain a polymer-containing energy rays-curable component and fine particles having an average particle diameter of not more than 30 nm, wherein the solid content of the fine particles is made to be from 5 to 60 wt %. A stamper-receiving layer or a curable pressure sensitive adhesive layer for bonding a protective layer is formed using this curable pressure sensitive adhesive composition, thus producing an optical disk producing sheet. This optical disk producing sheet has a low volume shrinkage rate upon curing, and has excellent adhesiveness. If this optical disk producing sheet is used, then an optical disk having little warping and excellent inter-layer adhesion can be obtained.

Curable pressure sensitive adhesive composition, optical disk producing sheet, and optical disk

The objective is to provide a surface protecting film for polycarbonate which is easy to laminate on polycarbonate and remove from the polycarbonate, the peel adhesive strength change to polycarbonate with times is small and there is no adhesive transferring to the backside of the film substrate in the case of storage for a long period or at a high temperature in the roll shape made of the long length tape. There provided a surface protecting film for polycarbonate, wherein a film substrate having Young's modulus of 1 GPa or more and an adhesive layer are comprised, the glass transition temperature (Tg) of the adhesive composing of the pressure sensitive adhesive layer being between 40 to 90&#xb0; C. and the initial 180&#xb0; peel adhesive strength to polycarbonate being between 10 to 300 mN/25 mm.

Surface protecting film for polycarbonate

An optical disc-producing sheet, which has an adhesive layerhaving a specific heat capacity after curing of not more than 1.9 J/g&#xb7;&#xb0; C. at 80&#xb0; C. and a protective sheet, is laminated onto an information recording layer(a laminate of a reflecting layer, a dielectric layer, a phase change layerand a dielectric layer') formed on an optical recording medium substrate. According to this optical disc, recorded information can be reproduced accurately even in the case that recording/erasure or reproduction of information has been carried out repeatedly.

Optical recording medium-producing sheet and optical recording medium

A stamper reception layerof an optical disk producing sheetis composed of a polymeric material that has energy-curing properties and possesses a pre-curing storage elastic modulus of 10to 10Pa. The number of deposits on a stamper can thus be reduced with this optical disk producing sheet

Growing community of inventors

Yokohama, Japan

Shin Kubota