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Applications of optical brightening agent er-i. fluorescent brightener 199 (optical brightening agent er-i) is very suitable for whitening and brightening polyester fiber and has good whitening effect on plastics such as pe, pp and pvc and their process of shaping with polyester chips or recovered polyester chips. in addition, the refined ...

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6. a fluorescent pigment according to claim 4 or claim 5 wherein the cross-linker is glycerine, pentaerythritol, dipentaerythritol, or trimethylolpropane. 7. an ink containing a solvent for the ink and a pigment according to any one of the preceding claims, the solvent being such as not substantially to solubilize the pigment. 8.

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