What is Tinuvin 770 (Light Stabilizer 770)?
Tinuvin 770, commercially known as Light Stabilizer 770 or HALS 770, is a high-efficiency hindered amine light stabilizer engineered to extend the lifespan of organic polymers. Unlike traditional UV absorbers that merely screen out ultraviolet light, this additive functions as a radical scavenger. We supply this product to actively neutralize free radicals generated during photo-oxidation, effectively preventing polymer chain scission. Its primary role is to maintain the mechanical integrity and aesthetic quality of plastics exposed to harsh outdoor weathering.
Understanding Low Molecular Weight HALS
Classified as a low molecular weight HALS (481 g/mol), Tinuvin 770 offers superior mobility within the polymer matrix compared to high molecular weight oligomers. This characteristic allows for rapid migration to the surface, providing exceptional protection in thick cross-sections. While high molecular weight stabilizers are preferred for thin films to reduce migration, the mobility of HALS 770 makes it the industry standard for molded goods, automotive parts, and structural components where deep, penetrating stabilization is critical.
Chemical Identity: Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate
The chemical foundation of this stabilizer is Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate. It is globally identified by CAS 52829-07-9.
- Chemical Name: Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate
- Appearance: White crystalline powder or granules
- Solubility: Soluble in organic solvents (acetone, chloroform); insoluble in water
This specific chemical structure ensures high compatibility with a wide range of substrates, including Polypropylene (PP), Polyethylene (PE), ABS, and Polyurethanes (PU). By preventing degradation at the molecular level, it ensures that end-products retain their gloss and physical strength significantly longer than untreated materials.
Technical Specifications & Physical Properties
When selecting additives for polymer stabilization, verifying the technical data is the first step to ensuring consistent performance. We provide Light Stabilizer 770 (often referred to internally as HI-SORB 770) with strict adherence to industry purity standards. As a low molecular weight HALS, its physical characteristics are optimized for efficient dispersion and high solubility in polymer matrices.
CAS 52829-07-9 Data and Purity Standards
The chemical identity of this stabilizer is Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, identified globally by CAS 52829-07-9. We supply this product as a white crystalline powder or granule. This form factor is critical because it ensures the additive flows freely during feeding and blends homogeneously into the masterbatch or compound without clumping.
Reliability is key. Our HALS 770 is manufactured to meet rigorous quality controls, ensuring a molecular weight of 481 g/mol. This specific weight contributes to its rapid migration to the polymer surface, providing immediate protection against UV degradation.
Melting Point and Solubility Metrics
Understanding the thermal behavior of Tinuvin 770 is essential for processing. It features a distinct melting range of 81 – 85 °C, which allows it to melt and disperse early in the extrusion process.
Volatility is another major factor we monitor. This stabilizer exhibits excellent thermal stability, showing less than 1% weight loss at 150°C and less than 5% at 200°C. This means it remains intact during standard processing temperatures, retaining its effectiveness in the final product.
Solubility Profile:
- Soluble in: Organic solvents such as acetone, chloroform, and methanol.
- Insoluble in: Water.
Key Technical Data
| Property | Specification |
|---|---|
| Product Name | Light Stabilizer 770 (HALS 770) |
| Chemical Name | Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate |
| CAS Number | 52829-07-9 |
| Appearance | White crystalline powder or granules |
| Melting Range | 81 – 85 °C |
| Molecular Weight | 481 g/mol |
| Volatility (TGA) | < 1% weight loss at 150°C |
Key Performance Benefits of HALS 770
We prioritize Light Stabilizer 770 in our inventory because it solves specific degradation issues that standard stabilizers often miss. Its distinct chemical structure allows it to deliver superior efficiency, particularly in applications where maintaining the physical look and strength of the plastic is non-negotiable.
Deep Section Protection for Thick Polymers
One of the standout features of Tinuvin 770 (and our equivalent HALS 770) is its effectiveness in thick section polymer protection. Unlike some additives that only sit on the surface, the low molecular weight of this stabilizer allows it to migrate freely through the polymer matrix. This ensures the material is protected deep inside the molded part, not just on the “skin.” This capability is critical for heavy-duty industrial goods where internal degradation could lead to catastrophic structural failure.
Preventing Chalking and Surface Cracking
Exposure to sunlight triggers polymer photo-oxidation, leading to ugly chalking, discoloration, and cracks. Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate functions as a powerful radical scavenger. It traps the free radicals generated by UV light before they can snap the polymer chains.
- Gloss Retention: Keeps surfaces looking new by preventing micro-cracks.
- Mechanical Integrity: Stops plastics from becoming brittle and shattering.
- Surface Defense: Excellent for ABS UV protection additives where aesthetics are key.
Synergy with UV Absorbers and High MW HALS
For the most demanding industrial UV weathering protection, we rarely rely on a single additive. HALS 770 shows incredible synergy when paired with other stabilizers, creating a robust defense system for your products.
| Combination Strategy | Primary Benefit |
|---|---|
| 770 + High MW HALS | Balances immediate surface protection (low MW) with long-term persistence (high MW). |
| 770 + UV Absorbers | The absorber blocks UV light, while 770 scavenges any radicals that slip through. |
| 770 + Antioxidants | Enhances thermal stability during high-heat processing and end-use. |
Using a Tinuvin 770 equivalent in these formulations ensures polyolefin light stabilizer systems perform reliably, even under harsh environmental stress.
Primary Industrial Applications
At our facility, we see Tinuvin 770 (HALS 770) deployed across a wide spectrum of industries because of its versatility. It isn’t limited to a single niche; it is a critical component for manufacturers requiring reliable weatherability in diverse polymer matrices.
Polyolefins: Protecting PP and HDPE
As a Polyolefin light stabilizer, this additive is a top performer. We specifically recommend it for Polypropylene (PP) and Polyethylene (PE), including both HDPE and LDPE varieties. Its low molecular weight allows for excellent migration to the surface, providing immediate protection.
- Agricultural Plastics: Essential for films and equipment exposed to constant sunlight.
- Industrial Films: Maintains tensile strength and prevents brittleness over time.
Engineering Plastics: ABS, Polystyrene, and SAN
For structural and aesthetic applications, preventing surface degradation is key. HALS 770 serves as one of the most effective ABS UV protection additives available. It is widely used in Acrylonitrile Butadiene Styrene (ABS), Polystyrene (PS), and SAN to stop the “chalking” and cracking that ruins molded goods.
- Automotive Parts: Protects exterior components from fading.
- Molded Goods: Ensures long-term retention of gloss and mechanical properties.
Polyurethanes and Elastomers Usage
Beyond standard plastics, we supply this stabilizer for use in Polyurethanes (PU) and Polyamides (PA). It is highly effective in preventing the yellowing and physical breakdown caused by photo-oxidation in these sensitive materials.
- Coatings: Enhances the durability of PU-based coatings.
- Sealants and Foams: Extends the service life of flexible and rigid polyurethane products.
Handling, Storage, and Safety Guidelines
Recommended Dosage and Processing Stability
When integrating Tinuvin 770 into your production line, stability during processing is crucial. This Light Stabilizer 770 is known for its low volatility, exhibiting a weight loss of less than 1% at 150°C. This ensures that the additive remains effective even during high-temperature compounding or molding operations.
While exact dosage levels depend on the specific polymer—such as PP, PE, or ABS—and the desired lifespan of the final product, HALS 770 is highly efficient. For optimal results, I often recommend utilizing its synergistic potential by combining it with other UV absorbers or antioxidants. This combination significantly boosts long-term thermal and light stability compared to using a single additive alone.
Storage Conditions and Shelf Life
To maintain the chemical integrity of CAS 52829-07-9, proper storage is non-negotiable. Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate is sensitive to environmental factors, particularly moisture.
Follow these storage protocols to ensure maximum shelf life:
- Environment: Store in a cool, dry, and well-ventilated area.
- Moisture Control: Keep containers tightly closed when not in use to prevent moisture absorption.
- Packaging: We supply this material in standard 25kg cartons or fiber drums, equipped with PE inner liners to provide an extra barrier against humidity and contamination.
GHS Classification and Safety Precautions
Handling industrial chemicals requires strict adherence to safety standards. Before using Tinuvin 770, it is essential to review the Safety Data Sheet (SDS) for detailed hazard information.
- Personal Protective Equipment (PPE): Always wear appropriate gear to prevent direct contact with the skin or eyes.
- Handling: Avoid breathing in dust or vapors during processing.
- Disposal: Follow local regulations for the disposal of any waste material or empty packaging.
We prioritize quality control and chemical purity to ensure that our HALS 770 meets the rigorous demands of global industrial applications while maintaining a safe working environment.
Frequently Asked Questions About Tinuvin 770
We receive many inquiries regarding the specific handling and selection of Light Stabilizer 770. Below, we address the most common technical questions to help you make informed decisions for your production lines.
Difference Between Tinuvin 770 and Tinuvin 622
The primary distinction lies in their molecular weight and migration properties. Tinuvin 770 is a Low Molecular Weight HALS, whereas Tinuvin 622 typically falls into the oligomeric (high molecular weight) category.
Here is a quick breakdown of why you might choose HALS 770:
| Feature | Tinuvin 770 (Low MW) | High MW HALS (e.g., 622 type) |
|---|---|---|
| Mobility | High migration rate | Low migration rate |
| Surface Protection | Excellent (moves to surface quickly) | Good for long-term bulk stability |
| Application | Thick sections, early-stage protection | Thin films, long-term heat stability |
| Mechanism | Rapid radical scavenging | Slower, sustained stabilization |
For applications requiring immediate surface protection against chalking or cracking in thick polymer sections, Tinuvin 770 is often the superior choice due to its mobility.
Food-Contact and Regulatory Compliance
Regulatory status for CAS 52829-07-9 varies significantly by region and specific concentration limits. While Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate is widely used in industrial packaging, compliance for direct food contact (FDA, EU regulations) depends on the specific formulation and end-use conditions.
- Always verify: Check the specific Material Safety Data Sheet (MSDS) and Technical Data Sheet (TDS) for the exact grade you are purchasing.
- Regional Rules: Ensure the additive meets the local migration limits for your target market (e.g., GB standards in China, FDA in the US).
Optimal Dosage for PP Injection Molding
Polypropylene (PP) is highly sensitive to UV degradation, making Tinuvin 770 a critical additive. Because this is a high-efficiency stabilizer, you do not need excessive amounts to see results.
General Dosage Guidelines:
- Standard Range: 0.1% to 0.5% by weight.
- Synergy: For enhanced performance, we recommend combining HALS 770 with a UV absorber (like UV-326). This combination provides both surface protection and broad-spectrum UV screening.
- Testing: We always advise running a test batch. Start at 0.2% and adjust based on the thickness of the molded part and expected UV exposure duration.
Using the correct dosage prevents issues like “blooming” (additive migrating too heavily to the surface) while ensuring your PP injection molding parts retain their mechanical strength and gloss.
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