Laser reactive dyes for DVD copy protection system
a technology of laser reactive dyes and dvd copy protection, applied in the field of transient optical state change security materials, can solve the problems of loss of billions of dollars of potential sales, cd readers/players having trouble reading cd-r media, and reducing reflectivity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Problems solved by technology
Method used
Image
Examples
example 1
Propyl and Hexyl Analogs of Methylene Blue
[0056] To shift the absorption maxima closer to 650 nm, propyl (MB-3) and hexyl (MB-6) analogs of methylene blue were synthesized using the procedure described by Mellish et al. as set forth below.
[0057] The absorption maxima of the compounds when coated onto optical media was in the expected range and the change in optical state was detectable by the PUH. The optical density of 5% poly-HEMA (poly-2-hydroxyethyl methacrylate), 250 mg MB-3, and 160 mg Bis-Tris(2,2-Bis(hydroxymethyl)-2-2′,2″-nitroethanol) on one disc was 0.22 absorbance units at 650 nm and the optical density on another disc using 325 mg MB-3, 5% poly-HEMA and 160 mg Bis-Tris was 0.3 absorbance units. The disc with optical density of 0.22 absorbance units demonstrated about a 18% photobleach at 650 nm. The disc with optical density 0.32 absorbance units demonstrated about a 30% photobleach at 650 nm.
[0058] An ETA or ED (electron donor agent) is a compound that is electron ...
example 2
Optical Disc Having Dye System Comprising MB-3
[0059] 250 mg of MB-3 dye was added to a 25 ml 4% polymer solution in 1-methoxy 2-propanol Aldrich catalog No. 484407 and 150 mg of Bis-Tris was added. The resulting solution was stirred vigorously on a shaker for 30-60 min. The final solution was filtered through a 0.2 μm filter and was used to spin coat optical discs. The spin coater used for this purpose was model P-6708D manufactured by Specialty Coating Systems.
example 3
Optical Disc having Dye System Comprising MB-3
[0060] To a 25 ml solution of 4% PolyHEMA in methoxy propanol was added 300 mg of MB-3 and 150 mg of Bis-Tris. The solution was stirred on a shaker for 30 min and filtered through 0.2 um filter and the filtered solution was used to coat discs using a spin coater Disc No. 1854-1857.
[0061] A two component dye system is yet another embodiment of the invention. In such system, the ETA is combined chemically with the polymer. It has been found by the present inventors that polymers that have ETA appended will photobleach. Useful electron transfer polymers include, but are not limited to: a) any polymer containing the bis(2-hydoxyethyl)amino functionality as shown below, b) homo-polymers or copolymers with vinyl acetate or methacrylate containing the (2-hydoxyethyl)amino functionality.
and c) any other polymer in Mol wt. range 50-100K that is soluble in methoxy propanol and having a bis(2-hydroxy ethyl)amino functionality.
PUM
| Property | Measurement | Unit |
|---|---|---|
| wavelengths | aaaaa | aaaaa |
| wavelength | aaaaa | aaaaa |
| wavelength | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More