AO-1076 is a secondary antioxidant based on tris(2,4-di-tert-butylphenyl)phosphite. It plays a key role in thermal processing of polyolefins and other polymers by decomposing hydroperoxides formed during oxidation.
It is non-discoloring, low volatility, and very effective when used in combination with phenolic antioxidants like AO-1010 or thioesters like AO-168.
| Property | Typical Value |
|---|---|
| Chemical Name | Tris(2,4-di-tert-butylphenyl)phosphite |
| Appearance | White powder or granules |
| Molecular Weight | ~ 646 |
| Melting Point | 180 – 183 °C |
| Phosphorus Content | ~ 4% |
| Volatility (at 180 °C) | < 0.3% |
| Recommended Dosage | 0.05 – 0.3 phr |
| Problem | AO-1076 Solution |
|---|---|
| High melt temperature discoloration | Neutralizes peroxides efficiently |
| Die buildup during extrusion | Improves melt flow and cleanliness |
| Loss of mechanical properties | Preserves polymer chain integrity |
| Need for non-yellowing system | AO-1076 + AO-1010 gives clean color |
Q1: Is AO-1076 a standalone antioxidant?
Not ideal alone. It’s best used with AO-1010 (primary phenol) for full oxidation protection.
Q2: Is it food contact safe?
Yes. Many grades comply with FDA 21 CFR and EU regulations for indirect food contact.
Q3: What is the best storage condition?
Cool and dry area, sealed container, away from direct light or air.
Q4: Can it replace thioesters?
No. Thioesters like AO-168 give long-term aging resistance. AO-1076 handles high-temperature stability.
Q5: Does it affect color or clarity?
No. AO-1076 is non-staining and low-impact on appearance.
