# US 7,744,976 B2 · Curable pressure sensitive adhesive composition, optical disk producing sheet, and optical disk > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,976 B2 - Document ID: US7744976B2 - Status: Granted - Kind: B2 - Application number: 11/071,280 - Filed: 2005-03-04 - Published: 2005-09-15 - Granted: 2010-06-29 - Earliest claimed: 2004-03-09 - Assignees: Lintec Corporation - Inventors: Kazuya Katoh; Shin Kubota; Sou Miyata - Web page: https://patentgrep.com/patent/US7744976B2 ## CPC - C09J 11/04: inorganic - C09J 7/10: without carriers - C09J 7/38: Pressure-sensitive adhesives [PSA] - G11B 7/256: of layers improving adhesion between layers - C08K 3/22: of metals - C08K 7/00: Use of ingredients characterised by shape - C08K 9/04: Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} - C09J 2301/408: additives as essential feature of the adhesive layer - Y10T 428/14: Layer or component removable to expose adhesive - Y10T 428/1405: Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.] - Y10T 428/1471: Protective layer - Y10T 428/1476: Release layer - Y10T 428/1486: Ornamental, decorative, pattern, or indicia - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract 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. ## Claims ### Claim 1 An optical disk producing sheet comprising: a curable pressure sensitive adhesive layer formed using a curable pressure sensitive adhesive composition including 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 from 5 to 60 wt %, the curable pressure sensitive adhesive layer has a pre-curing storage elastic modulus of from 1×103 to 5×106 Pa, and has a post-curing storage elastic modulus of at least 1×108 Pa, the curable pressure sensitive adhesive layer acts as a stamper-receiving layer, and the polymer-containing energy rays-curable component comprises an acrylate copolymer having energy rays-curable pendant groups and a weight average molecular weight of 150,000 to 1,500,000. ### Claim 2 (depends on 1) The optical disk producing sheet according to claim 1, wherein a sheet constituting an optical disk protective layer is laminated on one surface of the curable pressure sensitive adhesive layer, and if necessary a release sheet is laminated on the other surface of the curable pressure sensitive adhesive layer. ### Claim 3 (depends on 1) The optical disk producing sheet according to claim 1, wherein the optical disk producing sheet further comprises a release sheet laminated on one surface or both surfaces of the stamper-receiving layer. ### Claim 4 (depends on 1, 2, 3) An optical disk produced using the optical disk producing sheet according to any one of claims 1 through 3. ### Claim 5 (depends on 1) An optical disk producing sheet according to claim 1, wherein the fine particles are inorganic oxide particles modified with an organic material. ### Claim 6 (depends on 5) The optical disk producing sheet according to claim 5, wherein a sheet constituting an optical disk protective layer is laminated on one surface of the curable pressure sensitive adhesive layer, and a release sheet is laminated on the other surface of the curable pressure sensitive adhesive layer. ### Claim 7 (depends on 5) The optical disk producing sheet according to claim 5, wherein the optical disk producing sheet further comprises a release sheet laminated on one surface or both surfaces of the stamper-receiving layer. ### Claim 8 (depends on 5) The optical disk producing sheet according to claim 5, wherein the inorganic oxide particles modified with the organic material include silica modified with methyl ethyl ketone. ### Claim 9 An optical disk comprising: an optical disk substrate having a concavo-convex pattern on a first surface; an information recording layer formed on the concavo-convex pattern of the first surface; and a curable pressure sensitive adhesive layer compression-bonded onto the surface of the information recording layer, the curable pressure sensitive adhesive layer formed using a curable pressure sensitive adhesive composition including 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 from 5 to 60 wt, the curable pressure sensitive adhesive layer has a pre-curing storage elastic modulus of from 1×103 to 5×106 Pa, and has a post-curing storage elastic modulus of at least 1×108 Pa, the curable pressure sensitive adhesive layer acts as a stamper-receiving layer, and the polymer-containing energy rays-curable component comprises an acrylate copolymer having energy rays-curable pendant groups and a weight average molecular weight of 150,000 to 1,500,000. ### Claim 10 (depends on 9) The optical disk of claim 9, wherein the solid content of the fine particles is from 41 to 60 wt %. ### Claim 11 A method for producing an optical disk producing sheet, comprising: preparing a curable pressure sensitive adhesive composition including a polymer-containing energy rays-curable component and fine particles having an average particle diameter of not more than 30 nm, the solid content of the fine particles being from 5 to 60 wt %; applying the curable pressure sensitive adhesive composition onto a release treatment-subjected surface of a release sheet; and drying the curable pressure sensitive adhesive composition to form a stamper-receiving layer, wherein the curable pressure sensitive adhesive layer has a pre-curing storage elastic modulus of from 1×103 to 5×106 Pa, and has a post-curing storage elastic modulus of at least 1×108 Pa, and the polymer-containing energy rays-curable component comprises an acrylate copolymer having energy rays-curable pendant groups and a weight average molecular weight of 150,000 to 1,500,000. ### Claim 12 (depends on 11) The method for producing an optical disk producing sheet according to claim 11, further comprising: placing a release treatment-subjected surface of a second release sheet onto the exposed surface of the stamper-receiving layer, thus laminating the second release sheet and the stamper-receiving layer together.