DLTDP — Dilauryl Thiodipropionate | CAS 123-28-4
Basic Information
| Property | Value |
|---|---|
| CAS Number | 123-28-4 |
| Chemical Name | Dilauryl 3,3'-thiodipropionate |
| Molecular Formula | C30H58O4S |
| Molecular Weight | 514.83 g/mol |
| Appearance | White crystalline powder |
| Melting Point | 38–42 °C |
| Purity | ≥ 98% |
| Sulfur Content | 6.0–6.4% |
Introduction
Dilauryl Thiodipropionate (DLTDP), CAS 123-28-4, is a cost-effective secondary antioxidant of the thioester class. It is the diester of 3,3'-thiodipropionic acid with lauryl alcohol (C12), giving it a lower molecular weight (514.8 g/mol) compared to DSTDP.
This structural difference results in slightly better solubility in polymer melts at lower temperatures, making DLTDP particularly suitable for polyolefin processing below 200°C. Like all thioester antioxidants, it decomposes hydroperoxides into stable, non-radical products.
Regulatory status: FDA 21 CFR 178.2010; EU 10/2011 food contact approved.
Equivalent to: BASF Irganox PS 800 FL (same CAS, same chemistry). Cost advantage: 20–40% vs. branded equivalent.
DLTDP vs DSTDP Comparison
| Parameter | DLTDP | DSTDP |
|---|---|---|
| Molecular Weight | 515 g/mol | 683 g/mol |
| Melting Point | 38–42°C | 63–67°C |
| Solubility | Better at low temp | Better retention at high temp |
| Cost | Lower | Slightly higher |
| Best for | LDPE/LLDPE films | PP/HDPE high-temp parts |
Key Applications
- Polyolefins (PP, HDPE, LDPE): Typical loading 0.1–0.3 phr
- LLDPE Films: Long-term thermal stability in stretch and agricultural films
- Food Contact Plastics: FDA approved; suitable for food packaging resins
- Rubber & Latex: Heat stabilizer in SBR and natural rubber
- Petroleum Products: Antioxidant additive in lubricating oils and greases
- Hot-Melt Adhesives: Prevents thermal degradation during processing
- Synthetic Fibers (PET, Nylon): Processing stabilizer at moderate temperatures
Packaging & Storage
- Packaging: 25 kg kraft paper bags with PE inner liner
- Storage: Below 25°C, dry environment, away from heat sources
- Shelf life: 2 years from date of manufacture
FAQ
Q: Is DLTDP suitable for food packaging?
Yes. Listed under FDA 21 CFR 178.2010 and complies with European food contact regulation EC 10/2011.
Q: Can DLTDP be used alone without a primary antioxidant?
No — DLTDP provides only secondary (hydroperoxide decomposing) protection. It must be combined with a primary phenolic antioxidant like Antioxidant 1010 for comprehensive stabilization.
Q: What is the recommended dosage?
Typical: 0.1–0.3 phr. Common PP formulation: 0.1 phr Antioxidant 1010 + 0.2 phr DLTDP.
Q: How does DLTDP compare to Irganox PS 800?
Chemically identical (CAS 123-28-4). Sunchem sources from GMP-compliant Chinese manufacturers offering 20–40% cost advantage vs. branded equivalents.