This Optical Brightening Agent is very famous and very good used in Plastic Masterbatch.

Optical Brightening Agent OB (C.I.184)  (fluorescent brightener,Optical brightener)

Chemical name	2,5-bis-(5-ter-butyl-benzoxazolyl-)thiophene
Structural formula
Molecular formula:	C26H26N2O2S H9C4
Molecular weight:	430
Properties:	The product is a bright yellow-green crystal powder.Its melting point is 196-203°C,Decomposition temperature is larger than 220°CIts hard to dissolve in water. It dissolves in paraffin fat ,mineroil, wax and common organic solovents,The hue of the fluorescent light is blue light. The wave length of the maximum absorptive light is 375nm(ethyl alcohol).
Technical conditions:	Appearance: slight greenish yellow powder Melting Point:200-202°C Purity:≥99.0%         Fineness: through 100 meshes
Use:	It is mainly used in thermoplastic ,PVC, PE, PP, PS, ABS, SAN, CA, PA, PMMA, acrylic resin ,polyester fibre, paint, coating, the brightening of prointing ink
Package:	It is packed in bicorrugated paper box with a liner of plastic bag. The net weight of each box is 10 kg .It can be packed according to the requirement of the user

Note: It needs to be declared that the above data is based on our present knowledge and experience; owing to too many affecting factors, these data cannot be free from their check and test when processing and using the product.