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Optical Brightener OB
Optical Brightener OB

Optical Brightener OB

CAS No.: 7128-64-5 Other Names: Optical Brightener 184 MF: C26H26N2O2S EINECS No.: 230-426-4 Place of Origin: China Type: Solvent Dye Usage: Ink Dyestuffs, Leather Dyestuffs, Paint Dyestuffs, Paper Dyestuffs, Plastic Dyestuffs, Textile Dyestuffs, WAX,FAT,SMOKE Brand Name: TK Model Number: OB Melting point: 199-201°C(lit.) Boiling point: 531.2±45.0°C (Predicted) Density: 1.26 Refractive index: 1.6360 (estimate) Flash point: > 350°C Solubility: toluene: soluble 50mg/mL Appearance: Powder Acidity coefficient (pKa): 3.03±0.10( Predicted) solubility: Soluble in acetone and toluene. Insoluble in water.
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Product Name

Fluorescent Whitening Agent OB/184

Chemical Name

2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene

Molecular Formula

C26H26N2O2S

Molecular Weight

430.2

Maximum UV absorption wavelength

375 nm (in ethanol)

Maximum fluorescence emission wavelength

435 nm

Executive standard

Q/LQHOO9-2003

Application

OB is widely used in the whitening of thermoplastics such as PVC, PE, PP, PS, ABS and polyester fibers, paints, inks, coatings, etc. It is not suitable for plastics whose processing temperature is greater than 270°C.

Application Method

Polyvinyl chloride: whitening: 0.01-0.05% 

Increase brightness: 0.0001-0.001%

Polystyrene: 0.0001-0.001% 

ABS: 0.01-0.05% Polyphenylene hydrocarbon: colorless matrix: 0.0005-0.001%

White matrix: 0.005-0.05%

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