I. Introduction
Unilong is a professional manufacturer of specialty chemicals, proudly introducing our high-performance polymeric hindered phenol antioxidant – Unilong® JL-616 (Antioxidant 616, CAS 68610-51-5). Designed with low volatility, excellent compatibility, and superior color protection, JL-616 protects natural and synthetic rubbers, elastomers, and styrenic plastics from thermo-oxidative degradation, ensuring end-products maintain their appearance over time. It is an ideal solution for formulators looking to extend product life and prevent discoloration.
II. Product Overview: What is JL-616?
JL-616 (chemical name: Butylated reaction product of p‑cresol and dicyclopentadiene) is a polymeric hindered phenol antioxidant. Its high‑molecular‑weight polymeric structure provides extended protection against aging and offers broad material protection under various conditions. It shows remarkably higher antioxidant activity in heat‑aging tests than traditional monophenolic (such as BHT) and bisphenolic antioxidants.
III. Key Performance Advantages
1.Thermal Stability & Antioxidant Efficiency
Antioxidant JL-616 effectively inhibits the chain reactions that lead to polymer breakdown, protecting the integrity of the polymer matrix. It ensures long‑lasting stability in ABS, MBS, and styrene copolymers throughout a range of processing temperatures up to 260°C. Its polymeric structure provides highly efficient processing stability, long‑term thermal aging protection, and very low volatility.
2.Outstanding Discoloration & Blooming Resistance
Unlike certain low‑molecular‑weight phenolics that may cause discoloration upon migration, JL-616 prevents discoloration of rubber during aging. It is easily incorporated with a wide range of elastomers (such as NR, BR, SBR, NBR, and CR) without blooming. This makes it indispensable for light‑colored or uncolored rubber goods — like medical, food‑contact applications, and consumer products.
3.Low Migration & Extraction Resistance
The polymeric, high‑molecular‑weight structure of antioxidant 616 results in extremely low extraction and migration. It remains within the polymer matrix over time, ensuring long‑term antioxidant protection. This is a major benefit for demanding applications — such as carpet backing and elastic fibers, where stability must be maintained even after repeated washing or boiling.
4.Performance Comparison with Conventional Antioxidants
| Performance Parameter | JL-616 (Polymeric) | BHT (Monophenol) | 2246 (Bisphenol) |
| Molecular Weight | >600 (polymeric) | 220 | 340 |
| Volatility | Very low | High | Moderate |
| Discoloration Risk | None | Yes | Slight |
| Blooming Tendency | None | Common | Occasional |
| Water Extraction Resistance | Excellent | Poor | Moderate |
| Long‑term Thermal Aging | Excellent | Poor | Moderate |
Antioxidant JL-616 significantly outperforms conventional small‑molecule antioxidants in applications requiring low volatility, non‑staining performance, and resistance to water extraction.
IV. Technical Specifications
| ITEM | Specification | |
| Appearance | Light yellow granule | Unconfined flow, white powder |
| Initial Melting Point, ℃ ≥ | 115 | 115 |
| Volatility, wt% ≤ | 0.5 | 0.5 |
| Ash Content, wt% ≤ | 0.15 | 0.15 |
1.Packaging: 20kg/bag (kraft paper bag with PE liner), or customized upon request.
2.Storage: Keep in cool, dry, well‑ventilated area, away from direct sunlight. Shelf life is 24 months in original unopened packaging.
V. Core Application Areas
1. Rubber & Elastomer Industry
Antioxidant JL-616 is a high-performance protector for natural and synthetic polymers based on isoprene and butadiene chemistry. It is widely used in the processing of materials like NR, BR, SBR, NBR, and CR. Its applications range from automotive tires and industrial hoses to footwear soles and molded goods.
In tire manufacturing, JL-616 not only protects tread and sidewall compounds against thermo-oxidative aging during long-term use but also reduces the sidewall blue discoloration caused by antioxidant migration. In sealing strips and vibration-damping rubber parts, JL-616 shows excellent compatibility with fillers and vulcanization systems, does not interfere with cure speed, and ensures the retention of elastic properties under long‑term compression. Moreover, in light-colored and colored rubber goods (such as sports wristbands and rubber gaskets), JL-616’s anti-discoloration property keeps colors vivid and stable over time.
2.Plastics & Copolymers
Antioxidant JL-616 is effectively applied in the processing of plastics such as ABS, ASA, MBS, SBS, and SIS, delivering non‑staining stability and long‑term durability for applications like electronic device housings and household appliances.
3.Latex Products & Adhesives
Antioxidant JL-616 serves as a standard antioxidant for all types of latex products, from household and surgical gloves to medical products and baby bottle nipples. It also demonstrates excellent ageing resistance in hot‑melt adhesives and other adhesive formulations.
VI. About Unilong
Unilong is committed to being a trusted supplier of specialty chemicals for customers worldwide. With an understanding of advanced manufacturing, we ensure Unilong® JL-616 consistently meets strict quality standards, batch‑to‑batch consistency, and reliable supply capacity across all shipments. We do more than just provide raw materials; we offer technical support for your formulation challenges.
Contact Information
Whether you are formulating automotive tires, industrial hoses, durable adhesives, or medical products, the high‑quality Antioxidant 616 we provide is a reliable choice for your formulation design, helping your rubber and plastic products achieve a longer service life while maintaining better color stability in the market.
