UV-571

UV Absorber UV-571, also known as Tinuvin 571, is a liquid benzotriazole UV absorber designed to provide effective protection against UV-induced degradation in polymers, coatings, adhesives and other polymer-based materials. It is particularly suitable for applications where good compatibility, low volatility and long-term light stability are required.

With its liquid form and good solubility in many organic solvents, monomers and intermediates, UV-571 can be incorporated into a variety of polymer and coating systems. It is widely considered for thermoplastic polyurethane (TPU/PUR), PVC, PVB, PMMA, EVA, unsaturated polyester, adhesives, coatings, elastomers and polyolefins.

UV-571 is a hydroxylphenyl benzotriazole-type UV absorber that provides broad UV protection, particularly within approximately the 300–400 nm range. It absorbs high-energy UV radiation and converts the absorbed energy into a less harmful form, helping reduce the photochemical reactions responsible for polymer degradation.

One of the main advantages of UV Absorber UV-571 is its liquid form. Compared with solid UV absorbers, a liquid UV absorber can offer processing advantages in certain liquid formulations because it can be dissolved or dispersed more readily in suitable solvents, monomers and resin systems.

UV-571 also offers good polymer compatibility, low volatility and high absorption efficiency. These properties make it particularly useful in applications where long-term outdoor exposure and retention of appearance and physical properties are important.

1. UV-571 for Polyurethane and TPU

Polyurethane (PU) and thermoplastic polyurethane (TPU) are among the most important application areas for UV-571. Polyurethane materials can undergo yellowing, discoloration and loss of physical properties when exposed to prolonged UV radiation.

2. UV-571 for Coatings

UV Absorber UV-571 is also suitable for coating formulations where protection against sunlight and weathering is required. It can help reduce UV-induced degradation of resin systems and contribute to improved color retention, gloss retention and overall weatherability.

3. UV-571 for PVC

UV-571 can be used in both rigid and plasticized PVC. UV exposure can cause discoloration and deterioration of PVC products, particularly in outdoor applications.The liquid nature and compatibility of UV-571 make it suitable for PVC formulations where effective UV protection and processing compatibility are required. 

4. UV-571 for Plastics and Polymer Materials

Beyond polyurethane and PVC, UV-571 can be used in a range of polymer systems, including PVB, PMMA, PVDC, EVOH, EVA, unsaturated polyester, elastomers and polyolefins. It is also applicable to certain fiber-processing systems involving PA, PET, PUR and PP.

5. UV-571 for Adhesives, Elastomers and Other Formulations

UV-571 is also suitable for adhesives, latex, waxes, styrene polymers and copolymers, elastomers and polyolefins. Its solubility and emulsification characteristics can be useful when formulating liquid or water-based systems. According to BASF, the material can be considered for use during polymerization and can also be applied topically to PVC sheets.