Recording layer dye of recordable disk with high speed

Abstract

A data-board dyestuff of the CD-R at a high speed is made up by a proper organic solvent. The dyestuff can resist the optical activity and has the high absorptivity of the UV, the high dissolvability of the organic solvent. The new CD-R has the good valuable in the industry with the character of heat and optical activity resisting, high recording speed and so on.

Description

technical field [0001] The invention relates to a recording layer dye of a high-speed recordable optical disc, in particular to a phthalocyanine dye whose solubility, photosensitivity and stability can be improved by changing the structure of the dye itself. Background technique [0002] In view of the progress of the times and the mass circulation of information, a storage medium must have high density, small size, faster recording and reproduction speed, and low production cost to meet the trend of today's technology. Among them, magnetic storage media can no longer meet the demand, and optical memory Storage materials are currently the goal of research and development, so recordable optical recording media are growing rapidly in the global market, with an estimated annual demand of more than six billion pieces. In order to adapt to the rapid development of information, low-speed Optical recording media are gradually replaced by high-speed recordable optical discs. However...

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Problems solved by technology

[0003] (1) Jitter rate (Jitter), the structure of the dye itself leads to a lower glass transition temperature (Tg), which means that the dye is easy to change form due to temperature, resulting in poor thermal stability. When applied to recording media, its burning time The jitter rate will be high, and the relative block error rate (BLER, Block Error Rate) will increase accordingly

[0004] (2) Photosensitivity (stability), since the recordable optical disc uses laser light to melt organic dyes on the recording layer to form signal holes (pit), and the unheated part forms a platform (land), therefore, the light of organic dyes Sensitivity affects the quality after burning. However, the higher the photosensitivity, the lower the stability is usually. How to strike a balance between photosensitivity and stability is also the focus of related research

[0007] 1. Research on cyanine dyes. For example, it is known that in the structure applied for, cyanine dyes with a refractive index n ranging from 1.6 to 4.0 and an extinction coefficient k ranging from 0.01 to 0.45 are applied to light The recording layer of the recording medium, although the synthesis cost of cyanine dyes (Cyaninedyes) is relatively low, but the dyes need to add different component compounds such as quenchers (Quencher) or stabilizers, and the disc recording materials made in addition to optical resistance , heat resistance, recording speed, and recording and reproduction characteristics are difficult to meet the requirements of the market

[0008] 2. Another example is that the known technology uses azo dyes (Azo dyes) as the recording layer of high-density recordable optical discs, and the light absorption of the recording layer is between 0.65 and 0.75. , the cost of dye synthesis is high, the steps of synthesis and purification are quite difficult, and the solvent of dye must use high monovalent organic solvents such as TFP and OFP to achieve the ideal solubility, so the acceptance of related manufacturers is not high

[0009] 3. In order to meet the current high-speed burning requirements, phthalocyanine dyes (Phthalocyanine dyes) are widely used as recording layer materials. Phthalocyanine dyes have advantages in optical rotation resistance, moisture resistance, and heat resistance. However, Due to the problems of solubility, sensitivity to light and low reflectance caused by its own structure, it is necessary to change its own structure or add other compounds to improve the characteristics of the dye

In order to improve the solubility of the dye, it is known in the art that introducing fluorine atoms into the main structure of the phthalocyanine dye can increase the solubility of the dye and the adsorption force between the protective layer, but it has no benefit in improving the photosensitivity

[0010] 4. In order to improve photosensitivity and reflectivity, it is disclosed in the known technology that long-chain alkyl groups are used to replace halogen atoms on the branched structure of phthalocyanine dyes. Light sensitivity and reflectivity reduce the power required for laser writing, but the branched structure is replaced by long-chain alkyl groups, so the glass transition temperature (Tg) of the dye itself is low, resulting in poor thermal stability. When applied to recording media, the jitter value (Jitter) will be high during recording, so it cannot be applied to recording of CD-R discs

[0011] 5. If you want to increase the solubility of the dye and improve the heat resistance of the dye at the same time, it is disclosed in the known technology that a cyclic substituent with a large steric hindrance and a rigid structure is introduced into the phthalocyanine dye molecule, but the dye is resistant to heat. The stability is too high, and its sensitivity to light is relatively low, so it cannot be applied to high-speed CD burning

[0012] 6. The aforementioned studies have shown that changing the structure of the dye itself cannot improve the solubility, photosensitivity and stability at the same time. Related research uses the addition of other compounds to improve the characteristics of the dye itself. For example, in the known technology, adding a pit edge control agent For phthalocyanine dyes, the rate of thermal decomposition is increased to improve the conversion efficiency of light and heat, and the power of laser light irradiation can be reduced during recording, which meets the needs of high-speed programming

[0013] In summary, it is known that phthalocyanine dyes cannot simultaneously improve solubility, photosensitivity, and jitter rate by changing their own structure. Although related studies have pointed out that the characteristics of dyes can be greatly improved by adding other compounds, however, it causes Increase in manufacturing steps and man-hours

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