Introduction:
OB is a thiophenediyl benzoxazole class optical brightener suitable for various thermoplastic polymers, painting ink,
coating, paint.
Structural Formula:
Details  :
CAS No: 7128-64-5
Appearance: light yellow or milk white powder
Assay: 99%Min Melting point: 201-202ºC
Properties: 
1. Small consumption, strong whitening intensity, small consumption can bring a very good whitening result.
2. Wide service behavior, suitable for various kinds of plastic whitening.
3. Have a good compatibility with plastic, good resistance to high temperature and excellent light fastness and weathering
resistance.
Applications:
OB as an excellent brightener has been used in various thermoplastics including PVC, PS, PE, PP, ABS, Polyolefin and
other organic materials, It can also be used in coating, paint and ink, has good compatiblity with many substrates, has been
widely used in plastic industry because of good heat-resistance, low addition amount and exceptional whitening effect. It
shows special bright shade combined with some dyes. it is suitable for food packing but local regulations must be
observed.
Method of usage:
The recommended loading concentrations for light color polyolefin is 0.0005 % to 0.0010% and the loading levels in other
plastics range between 0.005% and 0.100% depending on substrate, processing conditions, and long-term stability
requirements.   When OB is used with UV absorbers, pls noted, the loading levels must be increased.
Please Noted: above recommended loading can be a reference. Exact loading must be 
determined by compositions of the specific polymer system

Dalian Richfortune Chemicals Co.,Ltd.

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