Optical brighteners are chemical products, mainly used in paper making, textiles, plastics and other fields. In March 2011, a U.S. manufacturer presented a complaint with the U.S. International Trade Commission and the U.S. Department of Commerce, requesting an anti-dumping investigation of fluorescent brightener exported from China to the U.S. The same month, the U.S. Department of Commerce made an affirmative final ruling and determined that there was dumping of optical brightener exported from China to the U.S. The dumping rate ranged from 63.98% to 109.95%.

In 2012, six members of the US International Trade Commission agreed that the import of chemical fluorescent brighteners from China caused substantial damage to related US industries. Therefore, the US Department of Commerce will require customs to impose anti-dumping duties on such products. According to data from the US International Trade Commission, there were only three US optical brightener manufacturers in 2011.

The U.S. Department of Commerce has also made affirmative final rulings and determined that chemical optical brightener manufacturers or exporters in Mainland China and Taiwan have dumped sales in the U.S. The dumping margins are 63.98% to 109.95% and 6 respectively. ．2%. In 2011, the total value of such products imported by the United States from China was 38.9 million U.S. dollars, and the value of imports from Taiwan was 18.9 million U.S. dollars.

Optical Brightener OB FB 184 is one of the most popular brighteners in US market.The following is the 

Data  sheet for your reference.

Product Name：Optical Brightener OB FB 184

Chemical Name：2,5'-Bis[2-(5-tert-buty l-2 benzoxazoly)thiophene

CAS No.：7128-64-5

C.I. No.：184

Molecular Formula：C26H26N2O2N2

Molecular Weight：430 

Appearance:slight greenish yellow powder 

Melting Point:200-202°C 

Purity:≥99% 

Uses：Mainly be used in whitening of thermoplastic, polyvinyl chloride(PVC), polypropylene(PP), polyester fiber, coating, paint & ink etc.

Packing ：25 kg per fiber drum