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Light Stabilizer 770
Light Stabilizer 770 is a low-molecular-weight hindered amine light stabilizer (HALS) appearing as a white crystalline powder. It functions as a radical-scavenging weather-resistance additive, offers good compatibility, and provides excellent resistance to light-induced aging in thick-section products.
It is frequently used in combination with UV absorbers and antioxidants, particularly for outdoor, thick-walled injection-molded products made from materials such as PP, HDPE, ABS, TPU, and polyurethane.
Chemical name: bis-(2,2,6,6-tetramethyl-4-piperidinyl) sebacate CAS number: 52829-07-9 Type: low molecular weight hindered amine (HALS) light stabilizer, does not absorb ultraviolet rays, and works by capturing free radicals.
二、 Physical and chemical indicators
Appearance: white-yellow crystalline powder/granules
Molecular weight: 480.74
Melting point: 81-86℃
Content: ≥99%
Volatile content: ≤0.5%
Ash content: ≤0.1%
Light transmittance: 425nm≥98%; 500nm≥99%
Solubility: soluble in toluene, acetone, chloroform; insoluble in water
三、 Mechanism of action
Gold compound: 770 + UV absorber UV‑531/327 + antioxidant 1010/168, the weather resistance effect is greatly improved.
四、 Advantages and Disadvantages
✅Low molecular weight, excellent compatibility, fast dispersion, and outstanding light stabilization effect for thick products
✅Colorless, does not affect the appearance of transparent and light-colored products
✅Low toxicity, some specifications can be used in food contact polyolefins
✅Good thermal stability, not easy to decompose during regular extrusion
❌Shortcomings: The molecular weight is low, and films and thin products have the risk of migration and precipitation in high-temperature and high-humidity environments; they are not resistant to acids and sulfur-containing additives, and are easily poisoned and ineffective when exposed to acidic flame retardants; greenhouse thin agricultural films are preferred to high molecular weight 622/944/783
Comparative distinction 770: Low molecular weight → Priority for injection molding of thick parts 622/944/783: High molecular weight → Priority for film and flat yarn
五、 Applicable materials
PP polypropylene injection molded parts, TPO, HDPE thick products
PS, HIPS, ABS, SAN, ASA
Polyurethane TPU, elastomer, POM polyacetal, nylon PA
Coatings, adhesives
六、 Recommended dosage
七、 Packaging, storage and transportation
25kg cardboard drum/carton; store in a cool, dark and dry place, moisture-proof; not classified as hazardous chemicals.
