Tinuvin 770 is a hindered amine light stabilizer (HALS) used to protect polymers from degradation caused by sunlight and UV exposure. Unlike UV absorbers that block light, HALS neutralize free radicals formed during photooxidation, extending the life and performance of plastics.
It is highly effective in polyolefins, polyamides, elastomers, and engineering plastics used in outdoor environments, automotive, agriculture, and fiber applications.
| Property | Typical Value |
|---|---|
| Chemical Name | Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate |
| CAS No. | 52829-07-9 |
| Appearance | White to pale yellow powder |
| Melting Range | 81 – 86 °C |
| Molecular Weight | ~480 |
| Light Stability | Excellent |
| Thermal Stability | Up to 300 °C |
| Recommended Dosage | 0.1 – 0.5 phr |
| Problem | Tinuvin 770 Advantage |
|---|---|
| Yellowing, fading, and brittleness | Stabilizes against UV and weather exposure |
| Short outdoor lifespan of plastic parts | Ensures longer service life |
| Poor compatibility with polymer matrix | High dispersion and low migration |
| High additive dosage needed | Effective even at low loading levels |
| Difficulty in blending with pigments | Minimal impact on color or processability |
Q1: How is Tinuvin 770 different from UV absorbers like UV-329?
UV absorbers block UV radiation; HALS like Tinuvin 770 neutralize free radicals. They are often used together for better effect.
Q2: Can I use Tinuvin 770 in high-temperature plastics?
Yes. It is stable up to 300 °C, suitable for most extrusion and molding processes.
Q3: Is it suitable for transparent or clear plastics?
Yes. It has low color and does not impact optical clarity.
Q4: What’s the shelf life of Tinuvin 770?
At least 24 months in sealed packaging under dry storage conditions.
Q5: What is the best way to apply it in production?
It is typically added via masterbatch or directly during compounding.
