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Chemical Name : 2,2-(2,5-Thiophenediyl) Bis {5-(1,1-dimethylethy)} Benzoxazole
C.I.Name 184
Molecular Formula C27H27O2N2S
CAS No. 7128-64-5
Assay 98.5% min.
Volatile Content 0.3% max
Appearance Yellowish or yellowish green crystal powder
Max. Absorption Wavelength 375 nm(in ethanol)
Molecular Weight 430
Melting Point 200-203
Ash 0.3% max
Particle Size 200 meshes

Optical Brightener OB is highly effective in polymer substrates such as PE, PP, ABS, PMMA, PET,PVC,PC,PA6,PU, adhesives and other organic substrates.

Main applications include fibers, molded articles, films and sheets. It can be used in clear lacquers, pigmented lacquers, paints, printing ink and synthetic leather. It is used for brightening of color pigments and to improve the jetness of black pigments.

Optical Brightener OB can be used as a tracer in a variety of applications.

OB features excellent resistance to heat, exceptional whitening properties, good light fastness and low volatility. It has a brilliant bluish cast and is readily soluble in organic solvents and features good compatibility in various substrates. The product is especially suitable for applications such as films and fibers.

OB enhances the whiteness of the substrate. In combination with dyes, the product produces particularly bright shads. Its excellent heat resistance renders OB suitable for all relevant processing conditions. It is suitable for packing applications but local regulations must be observed.

PVC White 0.01-0.05% (10g-50g)
Transparent 0.0001-0.001% (0.1g-1g)
PS White 0.001% (1g)
Transparent 0.0001-0.001% (0.1g-1g)
ABS Natural 0.01-0.05% (10g-50g) (effectively eliminates the intrinsic yellow color in ABS)
White 0.01-0.05% (10g-50g)
PE,PP Natural 0.0005-0.001% (0.5g-1g)
White 0.005-0.05% (5g-50g)

When OB is used in PMMA polymerization, take care that the polymerization is conducted to full completion since interaction with residual monomer can cause discoloration in the final application.