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May 2024
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Dimerax® OB
Optical brightener

 Chemical name: 2,5-thiophenediylbis(5-tert-butyl-1,3-benzoxazole)

DIMERAX® OB is a fluorescent whitening agent based on stilbene derivatives, suitable for the optical brightening of polymers.

DIMERAX® OB gives more intensity to colours and improves gloss of natural and coloured polymers: LDPE, HDPE, polypropylene, transparent and opaque rigid PVC, PVC paste, styrene homo‐ and co‐ polymers, including ABS, PBT, PET, PA, polycarbonate, polyacrylics, polyurethanes. It is recommended for the use in fibres, molded articles, films, and sheets. It can be used for the recycled polymers.

The product is applied in clear and pigmented lacquers, paints, printing inks, and in artificial leather. It is approved for plastics in contact with food.

Technical Data
Appearance: Light yellowish green powder
CAS Number: 7128-64-5
Empirical Formula: C26H26N2O2S
C.I. Number: 184
Molecular Weight: 430,2 g/mol
Purity: ≥ 99,5 %
Flash Point: ≥ 3500С
Melting Point: 196 – 2030С
UV Absorption Wavelength: max 375 nm (in ethanol)
Optical Emitting Wavelength: max 435 nm (in ethanol)
 Ash leftover: max 0,5 %
 Volatile Content: max 0,5 %

Storage: Keep in dry cool place protected from direct light. Guaranteed storage life is two years.

DIMERAX® OB represents a substance of the 3rd hazard class in compliance with GOST 12.1.007. The product does not produce allergic or carcinogenic effects. No skin irritation has been observed. DIMERAX® OB causes moderate eye irritation.

DIMERAX® OB can be transported by any vehicle keeping it away from atmospheric precipitation and direct light.

Technical tips: The optical brightener features good compatibility with different polymers. The recommended use levels of DIMERAX® OB range between 0.01‐0.03% in pigmented and 0.0002‐0.005% in uncoloured polymers, depending on performance requirements of the end product and processing conditions. For the best result, it is desirable to apply DIMERAX® OB in a variety of blends with processing‐, heat‐ and light stabilizers.