Optical Brightener OB(C.I.184)

Optical Brightener OB(C.I.184) CAS NO.:7128-64-5

Optical Brightener OB appears as a yellow powder with no odor. The basic structure of this compound consists of two benzoxazole rings attached to a thiophene ring. 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene is insoluble in water.

1.Item name:

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

2.Specifications:

CAS No.:7128-64-5

Assay:99.5% Min

Synonyms: 2, 5'-bis[2-(5-tert-buty l-2 benzoxazoly)thiophene; Fluorescent Brightener 184; 2, 2'-(2, 5-thiophenediyl)bis(5-(1, 1-dimethylethyl)-benzoxazol

Structural No.: C. I. 184

Molecular formula: C26H26SO2N2

Molecular weight: 430

EINECS:230-426-4

Structural formula:

3. Properties:

Appearance: Slight greenish yellow powder

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:soluble50mg/mL

Form:powder

Pka:3.03±0.10(Predicted)

Color:Pale Green to Yellow

Water Solubility:Soluble in acetone and toluene. Insoluble in water.

λmax:373nm(EtOH)(lit.)

Stability:Stable. Incompatible with strong oxidizing agents.

LogP:8.6 at 25℃

4. Application:

Optical Brightener OB is a fluorescent whitening agent of the thiophenediyl benzoxazole class. It`s highly effective in polymer substrates such as engineering plastics, PE, PC, PVC, PS, ABS and PP, adhesive and other organic substrates.

5.Package:

Packed in 25kgs fiber drum with double PE liners, or according to customers' request.
6.Storage:

Store in a cool and dry place.