OB is a high molecular weight optical brightener (fluorescent whitening agent) of the thiophenediyl benzoxazole class.It can be used for whitening thermoplastic plastics, PVC, PS, PE, PP, ABS, Acetate fiber, paint, coating, printing ink, etc.. It can be added at any stage in process for shining the polymers and can give the finished products a bright bluish white glaze.
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