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Bonded optical disks and method and appts for producing same

A technology of optical discs and equipment, applied in the field of optical discs

Inactive Publication Date: 2001-02-14
3M CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dual-layer discs, the two disc substrates are typically bonded by a transparent adhesive layer that is also used to separate the substrates to optically separate the two recordings on the substrates. Therefore, it is necessary to completely avoid the inclusion of fine air bubbles in the adhesive layer that cannot be detected by the naked eye. However, this problem of preventing the inclusion of air bubbles raises another problem related to production technology.

Method used

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  • Bonded optical disks and method and appts for producing same
  • Bonded optical disks and method and appts for producing same
  • Bonded optical disks and method and appts for producing same

Examples

Experimental program
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Effect test

example 1

[0124] Prepare a mixed solution consisting of 90 parts of isooctyl acrylate, 10 parts of acrylic acid, and 0.04 parts of a photoinitiator manufactured by CIBA-GEIGY under the trade name "Irgacure 651" as a photoinitiator, and then place it in a nitrogen atmosphere.

[0125] The mixed solution is then irradiated with ultraviolet radiation having a wavelength of 200 to 400 nm from an ultraviolet source to effect photopolymerization. When the reaction proceeded to a viscosity of about 500 cps (measured with a Brookfield viscometer), the UV irradiation was stopped to prepare a pressure-sensitive adhesive precursor.

[0126] 0.08 parts of hexanediol diacrylate and 0.1 part of "Irgacure 651" were added to the pressure-sensitive adhesive precursor to prepare a pressure-sensitive adhesive precursor slurry.

[0127] Thereafter, the pressure-sensitive adhesive paste was uniformly spin-coated on a transparent circular substrate made of polycarbonate to form a 28 µm-thick coating.

[01...

example 2

[0131] 50 parts of 2-ethylhexyl carbitol acrylate, 50 parts of oligomer (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "NK-Oligo U-340AX"), and 1 part of photosensitive An initiator (manufactured by Merck (Japan) under the trade name "Darocur 1173") was mixed together to prepare a pressure-sensitive adhesive precursor. The viscosity of the pressure-sensitive adhesive precursor was measured by the same method as in Example 1, and as shown in Table 1, was found to be 820 cps.

[0132] Spin-coat the pressure-sensitive adhesive precursor evenly on two circular substrates made of polycarbonate in the same manner as Example 1, to a thickness of 28 μm, and then make the pressure-sensitive adhesive The precursor is fully cured. As a result, it was found that a 28 µm thick pressure-sensitive adhesive layer was uniformly formed on the circular substrate. The storage modulus and gel fraction of the pressure-sensitive adhesive layer were measured in the same manner as in ...

example 3

[0135] 80 parts of n-butyl acrylate and 0.04 parts of "Darocur 1173" as a photoinitiator were mixed, and the mixture was placed in a nitrogen atmosphere and then irradiated with ultraviolet radiation to prepare a pressure-sensitive adhesive paste.

[0136] Then 10 parts of urethane acrylate "UV3000B" (manufactured by Nippon synthetic Chemical Industry Co., Ltd.), 10 parts of hydroxypropyl acrylate, and 1 part of "Darocur 1173" were added to this pressure-sensitive adhesive paste , to prepare a pressure-sensitive adhesive precursor, which had a viscosity of 480 cps when measured by the above method. The pressure-sensitive adhesive precursor was uniformly spin-coated on two circular substrates in the same manner as in Example 1 to a thickness of 28 µm, and the coating was completely cured by ultraviolet irradiation in a nitrogen atmosphere. In this case, it was found that a 28 μm thick pressure-sensitive adhesive layer could be uniformly formed on the circular substrate. The st...

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Abstract

A bonded optical disk comprising first and second transparent substrates bonded with a light-permeable, pressure sensitive adhesive layer and at least one information recording layer wherein the pressure sensitive adhesive layer has been formed from a pressure sensitive adhesive precursor, having a viscosity of 10 to 5000 cps and being applied onto at least one of the first substrate and the second substrate by radiation curing and has a gel fraction of not less than 50% and a storage modulus of 1.0x104 to 1.0x107 dyn / cm2 at 25° C., or in place of the pressure sensitive adhesive layer, an adhesive layer derived from a radiation curable adhesive precursor having a viscosity of 500 to 10000 cps, and the adhesive precursor is subjected to a higher pressure than an atmospheric pressure, prior to being irradiated, as well as a method and an apparatus for producing a bonded optical disk.

Description

field of invention [0001] The present invention relates to an optical disc, and more particularly, the present invention relates to a bonded optical disc having a structure comprising two substrates bonded to each other. The invention also relates to methods and apparatus for producing such bonded optical discs. Background of the invention [0002] Advances in multimedia in recent years have enabled even image and sound data to be processed with digital signals. In general, images and sounds have a large amount of information, and therefore, a high-capacity / high-density recording medium is required to cope with this. Optical discs (such as digital versatile discs (DVD) and compact discs (CD)) that can cope with future increases in capacity and density have attracted attention as the above-mentioned recording medium. [0003] In many cases, an optical disc comprises two transparent substrates bonded to each other via an information recording layer. For example, in Japanese...

Claims

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Application Information

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IPC IPC(8): B29C65/48G11B7/24024G11B7/24038G11B7/26
CPCB29L2017/005Y10S428/913B29C65/1432B29C65/4845Y10S430/146B29C65/1403B29C65/1406B29C65/4825B29C66/452G11B7/26B29C66/8322B29K2995/0027B29C66/71B29C66/72325B29C66/72326B29C66/72321B29C66/1122Y10T428/21B29K2069/00
Inventor 齐藤一太高松赖信高森克也
Owner 3M CO
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