Optical Brightener OB OBA 184 CAS 7128-64-5

Item Name:
OBA OB
OBA 184
Optical Brightener OB
Fluorescent Brightener 184
C.I.No : 184
CAS No.:  7128-64-5
Equal to: uvitex OB

Optical Brightener OB,  also known as Fluorescent Brightener OB, Fluorescent Brightener 184 or OBA 184, is one of the most popular Optical Brightener for whitening plastics, ink, paint, etc. It has a wide range of application and a strong whitening capability even with a small dosage.

BoldChem supplies high quality Optical Brightener OB (CAS No. 7128-64-5) with very competitive price.

Technical Specs of Optical Brightener OB

Chemical Name:  Fluorescent Brightener OB
CAS No: 7128-64-5
Molecular Formula:  C26H26N2O2S
Molecular Weight: 430.562
Appearance:  pale yellow powder
Melting Point: 200-202°C
Fineness: ≥ 200 mesh
Purity:  ≥99.0%
Volatiles: ≤0.2%
Ash: ≤0.1%

Properties of Optical Brightener OB

Optical Brightener OB is light yellowish powder, odorless, insoluble in water, but can be soluble in Alkane, Fat, Mineral Oil, Paraffin and most organic solvents. The shade of OBA 184 is blue white light, its maximum absorption spectrum is 375nm (in ethanol), and the maximum emission wavelength is 435nm (in ethanol).

Optical Brightener OB is thermal stable,  which means it has high temperature and excellent weather resistance. Fluorescent Brightener 184 also has a good light transmittance, in other words, strong whitening intensity. It can produce very good whitening effect even with a very small dosage.

Applications of Optical Brightener OB

Optical Brightener OB is widely used in brightening and whitening PVC, PE, PP, PS, ABS, PMMA, POM and other thermoplastics, as well as thermosetting plastics, polyester fiber, cellulose acetate (CA), polyamide (PA), paints, inks, coatings, etc. It has good fastness to sunlight without yellowing. OBA 184 is easy to dissolve in organic solvent and has very good whiteness effect. Optical Brightener 184 is equivalent to uvitex ob (Huntsman).

Fluorescent Brightener OB can be used for polymer whitening and brightening in various processing stages, giving the processed products bright blue white luster. Fluorescent brightener 184 can be used in conjunction with dyes to produce special brightness, which is particularly effective in color formulations.

Due to small dosage added, OBA 184 should be thoroughly dispersed throughout the entire polymer. If any ultraviolet absorber is added to the polymer, attention should be paid to adjusting the optimal amount of Optical Brightener OB appropriately.

Packaging and Storage of Optical Brightener OB

The standard packaging for Optical Brightener OB is 25 kgs per fiber drum lined with plastic film. Optical Brightener OB is stored in cool and dry place without direct sunlight. Shelf life for Fluorescent Brightener OB is at least 2 years.