4,4-Butylidenebis(6-tert-butyl-3-methylphenol)丨CAS 85-60-9

4,4-Butylidenebis(6-tert-butyl-3-methylphenol) (CAS 85-60-9) is a sterically hindered phenolic antioxidant widely used in polymers, elastomers, lubricants, and fuels. It is particularly effective in stabilizing plastics such as polyethylene, polypropylene, and polystyrene against thermal degradation and oxidative aging. In the rubber industry, it improves the longevity and performance of synthetic rubbers under heat and oxygen exposure. It is also applied in lubricants and oils to prevent oxidation that leads to viscosity increase, sludge formation, and performance loss. Furthermore, it is used in adhesives, coatings, and specialty chemical formulations where long-term oxidative stability is critical.

The benefits of 4,4-butylidenebis(6-tert-butyl-3-methylphenol) arise from its highly effective radical-scavenging ability, structural stability, and compatibility with a wide range of polymers and oils. The phenolic hydroxyl groups act as hydrogen donors to neutralize free radicals, thereby interrupting oxidative chain reactions. The bulky tert-butyl and methyl substituents provide steric hindrance, enhancing thermal stability and preventing rapid oxidation of the antioxidant itself. Its bifunctional structure further improves efficiency by offering multiple active sites in one molecule, making it more effective at lower concentrations. These properties result in longer service life, reduced maintenance costs, and improved performance of materials and formulations.