Optical Brightener OB-1
AOBO-OB1 is a diphenylethylene bisbenzoxazole fluorescent whitening agent for polyester and a range of plastic materials.
Product overview
AOBO technical data identifies OB-1 as a high-melting optical brightener for polyester fibres, polyester-containing fabrics and plastics. Listed plastic applications include ABS, PS, HIPS, PA, PC, PP, EVA and rigid PVC. Suitability and addition level should be confirmed in the customer's formulation and process.
Include the base material, processing temperature, opacity, existing pigments or UV absorbers, target shade and intended dosage when requesting a review.
Technical data and reference COA
| Chemical name | 2,2'-(1,2-ethenediyl)bis(4,1-phenylene)bisbenzoxazole |
|---|---|
| CAS number | 1533-45-5 |
| Colour Index | C.I. 393 |
| Appearance | Yellowish-green crystalline powder |
| Melting point | 357-361°C |
| Content | TDS: 99%; reference COA specification: ≥98.5% by HPLC; reference batch result: 99% |
| Mesh | Reference COA specification: ≥200 mesh; reference batch result: 300 mesh |
| Insoluble impurity | Reference COA specification: ≤0.5%; reference batch result: 0.28% |
| Volatile content | ≤0.5% |
| Maximum UV absorption | 374 nm in ethanol |
| Maximum optical emission | 434 nm |
The COA results above describe a reference batch. Request the current specification and lot-specific COA before ordering.
Applications and starting dosage
Polyester and fibres
Polyester fibres, polyester-containing fabrics, polyamide fibre and nylon are listed in the product TDS.
Plastics
ABS, PS, HIPS, PA, PC, PP, EVA and rigid PVC are listed applications.
Recycled polyester
The product TDS also identifies recycled polyester material, bottle material and flake as applications.
Formulation review
Dosage may require adjustment when UV absorbers or other colour-active additives are present.
| Transparent products | 0.0025-0.005% |
|---|---|
| Opaque products | 0.01-0.03% |
These are starting ranges from the product TDS. Confirm the final level with trials in the actual formulation.
Packaging and storage
| Packaging | Fibre drum, carton box or plastic bag; 10 kg, 20 kg and 25 kg options are listed in the product TDS. |
|---|---|
| Storage | Store in a cool, dry and ventilated place. The product TDS lists a storage period of up to two years under the stated conditions. |
Frequently asked questions
What is Optical Brightener OB-1 used for?
The product TDS lists polyester fibres and fabrics, recycled polyester and plastics including ABS, PS, HIPS, PA, PC, PP, EVA and rigid PVC.
What information is needed for an OB-1 inquiry?
Provide the base material, processing temperature, opacity, current colour, target appearance, dosage under consideration, quantity and destination.
Are the listed COA values guaranteed for every lot?
No. The test results shown are from a reference COA. Ask AOBO for the current specification and the COA for the relevant lot.