2 Full-color thermal recording material (TA paper) structure
The structural composition of the TA paper from the outside to the plastic-coated paper base is a heat-resistant protective layer, a yellow layer, a product layer, a cyan layer, and a support (the thickness of each layer is 7). The yellow and pigment coatings are light-fixed, transparent, heat-sensitive recording layers, and the cyan layers are dye-based, thermosensitive color-forming layers. If the three color-developing layers are directly laminated together, the heat-sensitive recording layers may be mixed when coated, or the color-forming components or sensitizers may spread between the layers after coating, which may cause color mixing or decrease in heat sensitivity. In order to avoid this phenomenon, often in the middle of each color layer is coated with a middle layer, such as mica compound intermediate layer. In addition, in order to improve the mechanical properties of the thermal transfer recording material, a transparent protective layer made of a polyvinyl alcohol adhesive is often coated on the color developing layer.
3 functional colorants for TA paper:
Diazonium salt
The TA paper requires many properties of the diazonium salt, of which photosensitivity and stability are very important for improving the performance. In order to have ultraviolet photodegradability, it is necessary to introduce a benzene diazonium salt into the electron donating group. The diazonium salt has enhanced thermal stability due to the introduction of a benzene ring electron-donating group. In particular, the O-site electron-donating group of the diazonio group has the effect of significantly improving the thermal stability.
The part that does not participate in image formation must have a high degree of whiteness, so the photodecomposition product of the diazonium salt must be colorless and stored under the light chamber without coloration (light stability in the table below). In terms of the colorlessness of this photodegradable substance, it is very advantageous for the absorption of the diazonium salt to be a short wave. That is, the photodegradability, the increase in thermal stability, and the colorless characteristics of the photodegradable substance can be adjusted only by the administration of the 4-position exchange group. Looking at the substitution group on the amino group, it will be understood that when the λmax of the diazonium salt is short-wavelength, the aryl group is difficult to perform colorless decomposition of the photodegradable substance, and the alkyl group having the electron-attracting group replaced is likely to be colorless . It can be seen from this that the 2b carbamoylmethyl group has a good balance.
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