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Optical Brightening Agents
Improve Paper Whiteness And Glossiness: OBA
Optical Brightening Agents (OBA) are essential papermaking chemicals specifically designed to enhance the whiteness and gloss of paper. By absorbing ultraviolet light and re-emitting blue light, OBA compensate for the natural color deficiencies in pulp, resulting in paper that appears whiter and brighter while improving print clarity and color reproduction. They are widely used in cultural paper, art paper, and high-end packaging paper, not only boosting the visual appeal of products but also meeting environmental and sustainability requirements.
- Azob® BA & Azob ® BAL: Main ingredient is Benzenesulfonic acid. It is a kind of disulfonic acid optical brightener. It has blue purple fluorescence. It’s anionic and its solubility in water is moderate, and it has good tolerance to acid.It has good affinity with paper fibers and little influence on PCD of wet-end.
- Azob® BBU & Azob® APC: Main ingredient is Benzenesulfonic acid. It is a kind of tetrasulfonic acid optical brightener. It is a product of high purity and versatility, has good acid and alkali tolerance and excellent brightening performance even at low pH value. And it has good storage ability at normal temperature.
- Azob® APW: Main ingredient is Benzenesulfonic acid. It is a kind of hexasulfonic acid optical brightener. It is especially suitable to be applicable on coating and surface sizing, and has the excellent brightening performance to paper. It has good acid tolerance and excellent brightening performance even at low pH value. And It has very strong light and alkali tolerance.
| Product Name | Appearance | Ionicity | Moisture(%) | Viscosity (cps） | pH Value |
| Azob® BA | Light yellow or yellow uniform powder | Anionic | ≤5 | – | – |
| Azob® BBU | Light yellow or yellow uniform powder | Anionic | ≤5 | – | – |
| Azob ® BAL | Amber clear liquid | Anionic | – | ≤100 | 9-10 |
| Azob® APC | Amber clear liquid | Anionic | – | ≤60 | 8-10 |
| Azob® APW | Yellow clear liquid | Anionic | – | ≤60 | 8-10 |
Application
- Good fluorescent whitening performance in stock.
- Good fluorescent whitening performance on surface sizing.
- Good fluorescent whitening performance on coating.
Packaging and storage
- 25kg bags or 50kg cardboard drums.
- Store in a dry, cool and well-ventilated place, avoid storing in the open air, at room temperature. (4-30 °C indoor cool place).
- Shelf life: 12 months.
