It is a high molecular weight optical brightener / fluorescent whitening agent...
Optical Brighteners are additives used to mask the inherent yellowness and used to improve colors and make your product look whiter and brighter. Optical brighteners are also known as fluorescent whitening agents. When exposed to UV light these additives absorb the light in UV spectrum and reemits it in visible blue spectrum. They absorb light in the UV region of 340-370nm. Typical applications of optical brighteners are Paints, inks or other lacquers, Films and sheets, Synthetic leather, Adhesives, Fibers and other thermoplastic applications.
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