Optical Brightening Agent OB-1 by Zhejiang Hongda Chemicals acts as an optical brightening agent. It gives an appearance of greenish yellow powder and is mainly used in whitening of polyester, as well in the whitening of nylon during polymerization.
4,4’-bis(4,4’-cyano-phenlene)-benzene. Acts as an optical brightening agent for polyester fiber. It shows strong fluorescence with bluish color shade and an excellent fastness to sublimation. It is also used for raw material of making paste form brightening agent in textile dyeing.
7-Diethylamino-4-methylcoumarin. Acts as a multipurpose brightener with an excellent whiteness, good solubility as well as compatibility. It appears as a off-white powder and is soluble in ethanol but insoluble in water. It is used for H-pvc, S-pvc, polyamide fiber as well as for acrylic fiber.
