PHENOL FREE DIRECT THERMAL PRINTING PAPER

Direct thermal papers are widely used for fast, inkless printing across retail, logistics, healthcare, financial and other industries. Standard sales slips are printed on thermal paper at checkout counters in retail stores and supermarkets. A direct thermal paper is composed of a color developing layer that reacts to heat from a thermal printer head and changes to a black color. The color developing layer is composed of a leuco/colorless dye, a developer, a sensitizer and a stabilizer. The developer is bisphenol-A or bisphenol-S which are toxic. Several compositions are proposed and used as substitutes for phenols. They include ascorbic acid, urea-urethane (e.g., Pergafast-201TM), zinc salts of salicylic acids and other proprietary formulations. These substitutes have similar health and environmental issues as phenols (Health Risk Soc. 2014; 16(7-8): 649–666, and Chemospher 364 (2024) 143147). Hence, there is a need for an essentially non-toxic substitute developer. We have developed a developer composition which does not have a toxicity pictogram and works essentially as good as bisphenol-A.

According to some market studies, (i) the total global thermal paper market is valued at ~$4 billion in 2025 and is projected to reach toward $6.0 billion by 2035, (ii) the global phenol-free thermal paper developer market is $150 million in 2025 and is projected to reach ~$200 million by 2032 and (iii) global production of phenol-free thermal paper developers has reached 7,348 tons in 2025 (out of ~15,872 tons total for all thermal paper developers).