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Prolonged exposure to blue light emitted from smartphones, computer screens and other household fixtures can disturb our sleep and even damage our eyes, causing conditions such as eyestrain, cataracts and age-related macular degeneration. Tosaf has recently completed the development of a new line of blue light screening masterbatches, answering demand by manufacturers of optical film/ thin sheets for such a specialized additive. There is a linear trade-off between blue light screening, transparency and film/ thin sheet color: as the masterbatch screens or completely blocks more blue light in the 390nm – 500nm spectrum, there is a reduction in total light transmission, i.e.
Transparency, and the color of the film or thin sheet becomes more yellow/ orange.
To give manufacturers a choice of solutions to suit their blue light/ transparency/ color priorities, Tosaf’s new masterbatch line includes four products, each with its own screening baseline. Having selected the masterbatch with the baseline closest to their needs, manufacturers can then further refine their choice by selecting the usage concentration of the specific masterbatch to achieve their optimal blue light/ transparency/ color trade-off.