# US 7,744,979 B2 · Compositions for protective films for optical discs

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- Number: US 7,744,979 B2
- Document ID: US7744979B2
- Status: Granted
- Kind: B2
- Application number: 11/405,438
- Filed: 2006-04-18
- Published: 2006-10-12
- Granted: 2010-06-29
- Earliest claimed: 2003-10-20
- Assignees: Sony Corporation; Sony Chemical & Information Device Corporation
- Inventors: Kiichiro Oguni; Satoshi Yanagida; Kozaburo Hayashi
- Web page: https://patentgrep.com/patent/US7744979B2

## CPC

- C08L 33/00: Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C09D 7/61: inorganic
- C09D 7/67: {Particle size smaller than 100 nm}
- G11B 7/2545: containing inorganic fillers, e.g. particles or fibres
- C08K 3/22: of metals
- C08K 3/36: Silica
- G11B 7/2534: polycarbonates [PC]
- G11B 7/257: of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- Y10T 428/21: Circular sheet or circular blank
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- 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

Compositions for protective films include inorganic microparticles dispersed in an acrylic radical-based binder resin. Binder resins are formed from binder monomers including base components, scratch-resistant components and diluent components. Diluent components include diluent monomers having principal chain structures including a functional group having a cyclic structure or a branched carbon chain structure.

## Claims

### Claim 1

A composition for protective films for optical discs comprising inorganic microparticles dispersed in an acrylic radical-based binder resin, wherein:
the binder resin is formed from a binder monomer comprising a base component, a scratch-resistant component and a diluent component, wherein:
the base component is a monomer having a viscosity of less than 100 mPa·s;
the scratch-resistant component is a monomer having an acrylic functionality of three or more, wherein the scratch-resistant component monomer is selected from the group consisting of tris (acryloxyethyl) isocyanurate, dipentaerythritol penta- and hexa-acrylate, ditrimethylolpropane tetraacrylate, and pentaerythritol tetraacrylate; and
the diluent component comprises a diluent monomer, a principal chain structure of the diluent monomer comprising a functional group having a cyclic structure, the diluent component having a viscosity of 10 mPa·s or more and 50 mPa·s or less; and
a ratio of the base component, scratch-resistant component and diluent component in the binder monomer is from 70:5:25 to 60:20:20, and wherein
the composition for protective films for optical discs has a viscosity of 20 mPa·s or more and less than 100 mPa·s.

### Claim 2 (depends on 1)

The composition according to claim 1, wherein the diluent component comprises a monofunctional or bifunctional group.

### Claim 3 (depends on 1)

The composition according to claim 1, wherein a viscosity of the diluent component is less than a viscosity of the composition.

### Claim 4

A protective film for optical discs, comprising a film obtained by curing a composition comprising inorganic microparticles dispersed in an acrylic radical-based binder resin formed from a binder monomer comprising a base component, a scratch-resistant component and a diluent component,
wherein:
the base component is a monomer having a viscosity of less than 100 mPa·s;
the scratch-resistant component is a monomer having an acrylic functionality of three or more, wherein the scratch-resistant component monomer is selected from the group consisting of tris (acryloxyethyl)isocyanurate, dipentaerythritol penta- and hexa-acrylate, ditrimethylolpropane tetraacrylate, and pentaerythritol tetraacrylate;
the diluent component comprises a diluent monomer, a principal chain structure of the diluent monomer comprising a functional group having a cyclic structure, but not a branched carbon chain structure, the diluent component having a viscosity of 10 mPa·s or more and 50 mPa·s or less; and
a ratio of the base component, scratch-resistant component and diluent component in the binder monomer is from 70:5:25 to 60:20:20, and wherein
the composition has a viscosity of 20 mPa·s or more and less than 100 mPa·s.

### Claim 5

An optical disc, comprising:
a substrate having a recording pattern; and
a protective film formed on a surface of a readout side of the substrate; wherein:
the protective film is obtained by curing a composition comprising inorganic microparticles dispersed in an acrylic radical-based binder resin;
the binder resin is formed from a binder monomer comprising a base component, a scratch-resistant component and a diluent wherein:
the base component is a monomer having a viscosity of less than 100 mPa·s;
the scratch-resistant component is a monomer having an acrylic functionality of three or more, wherein the scratch-resistant component monomer is selected from the group consisting of tris (acryloxyethyl) isocyanurate, dipentaerythritol penta and hexa-acrylate, ditrimethylolpropane tetraacrylate, and pentaerythritol tetraacrylate; and
the diluent component comprises a monomer having a principal chain structure comprising a functional group having a cyclic structure,
the diluent component having a viscosity of 10 mPa·s or more and 50 mPa·s or less;
a ratio of the base component, scratch-resistant component and diluent component in the binder monomer is from 70:5:25 to 60:20:20, and wherein
the composition comprising inorganic microparticles dispersed in an acrylic radical-based binder resin has a viscosity of 20 mPa·s or more and less than 100 mPa's.