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Antioxidant 1098
Antioxidant 1098 (Irganox 1098) is a high-molecular-weight hindered phenolic primary antioxidant appearing as a white powder (CAS: 23128-74-7).
Due to the presence of amide groups in its molecular structure, it exhibits excellent compatibility with nylon resins. It features low volatility, high-temperature resistance, resistance to blooming and water extraction, and low yellowing. It serves as a specialized, long-lasting thermal-oxidative stabilizer for nylon (PA6, PA66) and is also suitable for materials such as POM, PET, PBT, TPU, ABS, and elastomers.
It is often used in synergistic combination with Antioxidant 168; the typical dosage is 0.2–0.5%. Store in a cool, dry, and sealed environment.
Chemical Name: N,N'-Hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionamide] | CAS No.: 23128-74-7 | Product Type: High-molecular-weight amide-type hindered phenolic primary antioxidant (premier antioxidant specifically for nylon)
二、 Physicochemical Properties
Appearance: White, odorless, free-flowing powder
Molecular Weight: 636.9
Melting Point: 156–161°C
1% Weight Loss Temperature: 280°C (excellent high-temperature resistance)
Volatile Content: ≤0.3%
Ash Content: ≤0.1%
Solubility: Soluble in methanol and chloroform; virtually insoluble in water
三、Key Advantages
✅ Excellent compatibility with nylon: Contains amide groups that form hydrogen bonds with PA resin; resistant to migration and blooming (surface exudation)
✅ Low volatility: Minimal loss during high-temperature spinning and extrusion processes
✅ Non-staining and low yellowing: Ensures good color stability of finished products
✅ Water extraction resistance: Suitable for parts subjected to washing or water contact
✅ Inherent mild metal-deactivating effect: Reduces the risk of copper-ion-catalyzed degradation
✅ Often compounded with secondary antioxidant 168 (e.g., BASF's B1171 = 1098 + 168); a high-performance formulation for modified nylon
四、Applicable Materials
Primary: Nylon PA6, PA66 (injection-molded parts, nylon fibers, films)
POM (polyoxymethylene), PET/PBT (polyester), TPU (polyurethane)
ABS, elastomers, hot-melt adhesives, adhesives, etc.
五、Recommended Dosage
Standard Nylon Applications: 0.2–0.5%
Other Engineering Plastics: 0.1–0.3%
六、Storage, Transport, and Packaging
Standard packaging: 20 kg/bag; store in a cool, dry, sealed environment; classified as non-hazardous.
