In the realm of UV curing technology, pigmented systems present unique challenges due to the light-absorbing nature of pigments. Selecting the right photoinitiator is crucial to overcome these hurdles and ensure efficient curing. Isopropylthioxanthone (ITX) has emerged as a preferred choice for formulators working with pigmented UV curable inks, coatings, and other applications. This article explores why ITX is an exceptional UV curable inks photoinitiator and UV curable coatings photoinitiator for pigmented systems.

Pigments, essential for imparting color and opacity, inherently compete with photoinitiators for UV light absorption. This competition can lead to incomplete curing, surface tackiness, or reduced overall performance. ITX, however, possesses a distinct advantage: its absorption spectrum extends into the visible light range, particularly in the blue light region (tailing up to ~420 nm). This broad absorption capability allows ITX to effectively capture UV energy even when it is attenuated by pigments. When ITX absorbs light, it transitions to an excited state and, in the presence of a suitable co-initiator, generates free radicals that initiate polymerization.

The synergy between ITX and amine co-initiators is particularly beneficial for pigmented systems. This combination facilitates efficient hydrogen abstraction, leading to strong surface cure and excellent through-cure. This dual-action curing is vital for ensuring that the entire film thickness cures properly, resulting in durable, scratch-resistant finishes and vibrant, well-adhered prints. The ability to achieve such comprehensive curing in the presence of pigments underscores ITX's position as a highly effective high efficiency UV photoinitiator.

Furthermore, ITX's versatility allows it to be used in conjunction with other photoinitiators to create tailored systems that meet specific application requirements. Its role as a sensitizer can also enhance the performance of other photoinitiators, providing formulators with greater control over the curing process. Whether you are developing high-speed printing inks or robust industrial coatings, ITX offers a reliable solution for achieving optimal results in pigmented formulations.

At NINGBO INNO PHARMCHEM CO.,LTD., we understand the critical need for high-performance photoinitiators in specialized applications. As a leading chemical supplier in China, we provide premium-quality ITX, ensuring that our clients have access to the materials necessary for their success. Choose ITX for your pigmented UV systems and experience the difference it makes in curing efficiency and final product quality.