Developer for recording materials
A color developer, carbon atom technology, applied in thermography, organic dyes, azo dyes, etc., can solve the problems of lack of sensitivity and image stability, insufficient sensitivity, and inability to provide sufficient sensitivity and image stability.
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Embodiment 1
[0177] 20 g of toluene and 48.0 g (510 mmol) of phenol as a phenolic compound were placed in the flask, and 5.0 g (25.6 mmol) of 2,6-dihydroxymethyl-4 as a para-substituted phenol derivative was placed in the flask. - Isopropylphenol, stirring the mixture thus obtained for dissolution. To this solution was added 0.12 g (0.63 mmol) of p-toluenesulfonic acid monohydrate at 30°C with stirring, and then the solution was stirred for 5 minutes, after which it was allowed to react at 60°C for 2 hours. The resulting reaction solution was washed with water so that its pH was 6, and then toluene as a solvent and phenol used in excess were removed under reduced pressure to obtain a condensation product as a developer of the present invention. In the obtained developer, the content of triphenol compound (A) is 90%, the content of residual phenol is 0.4%, the rest is composed of other condensation by-products, the content of triphenol compound (C) is 16%, and The melting point is 130°C. ...
Embodiment 2
[0182] Obtain according to the step of embodiment 1 as the condensation product of developer of the present invention, difference is to replace 5.0g (25.6mmol) with 5.4g (25.6mmol) 2,6-dihydroxymethyl-4-sec-butylphenol 2,6-Dihydroxymethyl-4-isopropylphenol. In the obtained developer, the content of triphenol compound (A) is 89%, the content of residual phenol is 0.2%, the rest is composed of other condensation by-products, the content of triphenol compound (C) is 19%, and The melting point is 120°C.
[0183] Using the obtained color developer, a coating liquid containing a color forming material composition was prepared according to the procedure of Example 1, and a performance evaluation test of a recording material was carried out. The results thus obtained are shown in Table 1.
Embodiment 3
[0185] 48.0 g (510 mmol) of phenol was put in the flask, and 5.0 g (25.6 mmol) of 2,6-dihydroxymethyl-4-tert-butylphenol was further put in the flask, and the mixture thus obtained was stirred for dissolution. To this solution was added 0.074 g (0.73 mmol) of 36% hydrochloric acid at 30° C. with stirring, and then the solution was stirred for 5 minutes, after which it was allowed to react at 60° C. for 2 hours. The resulting reaction solution was washed with water to bring its pH to 6, and excess phenol used was removed under reduced pressure to obtain a condensation product as the developer of the present invention. In the obtained developer, the content of triphenol compound (A) is 86%, the content of residual phenol is 0.6%, the rest is composed of other condensation by-products, the content of triphenol compound (C) is 12%, and The melting point is 126°C. Further, toluene was added to the developer, and the thus-obtained mixture was stirred under heating, cooled and filte...
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