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Data storage medium comprising colloidal metal and preparation process thereof

a technology of colloidal metal and data storage media, which is applied in the direction of optical recording/reproducing/erasing methods, photomechanical devices, instruments, etc., can solve the problems of significant decline in recording sensitivity, unintended polymerization, and difficult to achieve the characteristic of particular performance of holographic recording media designed for data storage applications. , to achieve the effect of sufficient time duration

Inactive Publication Date: 2008-02-21
APRILIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention is a photopolymerizable holographic recording medium for data storage that uses colloidal metal nanoparticles as a component. The nanoparticles exhibit a threshold for polymerization that is insensitive to exposure conditions, such as the ones used for forming holograms and interrogating the medium. The nanoparticles are prepared by thermally decomposing an organotransition metal compound in a solution with a viscosity greater than about 10 centipoises. The resulting stable transition metal colloid is suspended in a solution with a monomer or oligomer that polymerizes under cationic conditions or a \"binder\" that supports cationic polymerization. The solution is free of additives typically used for forming transition metal colloids and can contain other additives, such as stabilizers. The stable transition metal colloid is used as a component of a holographic recording medium that has a high threshold for polymerization, which prevents premature reaction of the monomer or oligomer and ensures proper functioning of the medium."

Problems solved by technology

This particular performance characteristic, however, remains as one of the most difficult to achieve for photopolymerizable holographic recording media that are designed for data storage applications.
Typically initiator species form over time, as a result of thermal decomposition processes that take place at room temperature, and thus unintended polymerization occurs.
A consequence of short pre-recording shelf life is a monotonic and significant decline in recording sensitivity as exhibited by photopolymerizable recording media.
This, of course, is only practical when the recording sensitivity is known at the onset of each recording event.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Bis(2,4-pentanedionate) palladium (II) (Aldrich, 99%) was first added to a mixture of DowCorning® 705 and a difunctional epoxide monomer, PC-1000, and the contents was then stirred at room temperature prior to heating. The mixture was heated slowly to about 80° C. while stirring and held isothermally for about 15 minutes until complete dissolution occurred, at which time the color changed to light yellow. The mixture was then rapidly heated in an oil bath under nitrogen atmosphere while stirring until the color started to change from light yellow to brown, which for example occurs at a bath temperature of about 185° C. for a 50 / 50 mixture (w / w) of DowCorning® 705 and PC-1000, and upon continued heating the mixture turned a blackish color, which for the aforementioned mixture occurred at about a bath temperature of 200° C. The mixture was subsequently kept at this temperature for about 30 minutes and was then cooled to ambient temperature under nitrogen atmosphere. The resulti...

example 2

[0024] Bis(2,4-pentanedionate) platinum (II) (Aldrich, 99%) was first added to a mixture of DowCorning® 705 and a difunctional epoxide monomer, PC-1000, and the contents was then stirred at room temperature prior to heating. The mixture was heated slowly to about 85° C. while stirring and held isothermally for about 15 minutes until complete dissolution occurred, at which time the color changed to light yellow. The mixture was then rapidly heated to about 200° C. under nitrogen atmosphere while stirring and held isothermally at about 200° C. until the color started to change from light yellow to brown, which for example occurs after about 90 minutes for a 50 / 50 mixture (w / w) of DowCorning® 705 and PC-1000. After the solution was held isothermally at about 200° C. for about an additional 45 minutes it turned a blackish color. The mixture was then cooled to ambient temperature under nitrogen atmosphere. The resulting blackish colored solution, which contains colloidal Platinum (0) in ...

example 3

[0027] Palladium (II) acetylacetonate (40.7 mg) was dissolved in 2.0 ml of methylene chloride and then 9.02 g of DowCorning® 705 silicone fluid was added into the mixture. The contents of the mixture were kept under nitrogen atmosphere. The mixture was stirred at ambient temperature for 10 minutes prior to heating, followed by slow heating of the mixture to 80° C. while stirring. The mixture was maintained isothermally at 80° C. for about 15 minutes until complete dissolution occurred, at which time the color changed to a dark yellow. Methylene chloride was then removed from the solution by using a nitrogen purge of the solution. The solution was subsequently heated in an oil bath under nitrogen atmosphere while stirring until the color changed from yellow to brown, which occurred at 175-185° C. Heating was continued additionally to higher temperature until the color changed to a darker blackish color, which occurred at about 200° C. The solution was maintained isothermally at 200° ...

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Abstract

Disclosed is a photopolymerizable holographic recording medium for data storage that comprises colloidal metal, and which exhibits a threshold for a second stage polymerization which is substantially insensitive to the light used for both forming holograms and interrogating the medium during servo and / or read events. Also disclosed is a method of preparing said photopolymerizable holographic recording medium. Also disclosed is a method for preparing a colloidal without additives in a viscous medium.

Description

RELATED APPLICATION(S) [0001] This application is a divisional application of U.S. application Ser. No. 10 / 300,700, filed Nov. 20, 2002, which is a continuation of International Application No. PCT / US01 / 16635, which designated the United States and was filed on May 23, 2001, published in English, which claims the benefit of U.S. Provisional Application No. 60 / 206,370, filed on May 23, 2000. The entire teachings of the above applications are incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention relates to a holographic recording medium in which the underlying molecular structure formed in a format hologram can be altered as micro-localized regions in the format hologram, during a subsequent recording step which uses focused actinic radiation, and which exhibits a threshold for recording that consequently provides the ability to change the refractive index modulation of the original hologram solely in the altered region, and to a process for preparing a recordi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03F7/00C08G59/20C08G59/68G03F7/004G03F7/038G03F7/075G03H1/02G11B7/0065G11B7/26
CPCB82Y10/00G03F7/001G03F7/0043G03F7/0045G11B7/26G03F7/038G03F7/0755G03F7/0757G11B7/0065G03F7/0047
Inventor CETIN, ERDEM A.INGWALL, RICHARD T.MINNS, RICHARD A.WALDMAN, DAVID A.TAKIFF, LARRY C.
Owner APRILIS