Paper Optical Brightening Agents: What are they made of?
Stilbene-based optical brightening agents (OBAs) are used widely in the manufacture of coated and uncoated white paper and board with with around 125,000 tons being produced in countries such as China, Europe, India, Taiwan, and Indonesia.
Chemically, this type of OBAs is based on a diamino-stilbene structure (abbreviated to DAST or DASDA) which derives from toluene through various intermediates.…
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