Overview
4-Methoxybenzophenone (4-MBP) is an organic compound belonging to the benzophenone family. It is widely recognized for its role as a photoinitiator in UV-curable coatings, inks, and adhesives. The compound's ability to absorb UV light and initiate polymerization reactions makes it valuable in industrial and pharmaceutical applications. First synthesized in the mid-20th century, 4-MBP has since become a staple in polymer chemistry due to its efficiency and stability. Its derivatives are also explored for their potential in medicinal chemistry, particularly in drug formulation and photodynamic therapy.
Physical and Chemical Properties
4-Methoxybenzophenone is a crystalline solid with a molecular weight of 212.24 g/mol. It exhibits a melting point of 62-65°C and a boiling point around 340°C. The compound is soluble in common organic solvents like ethanol and acetone but shows negligible solubility in water. Its UV absorption spectrum peaks at approximately 250-350 nm, making it effective for applications requiring UV light initiation. The methoxy group at the para position enhances its electron-donating properties, which contributes to its reactivity in photochemical processes.
Main Applications
In industrial settings, 4-MBP is primarily used as a photoinitiator in UV-curable systems, including coatings for electronics, packaging, and automotive parts. Its ability to generate free radicals under UV exposure accelerates polymerization, ensuring rapid curing times. The pharmaceutical industry employs 4-MBP as an intermediate in synthesizing active pharmaceutical ingredients (APIs). Additionally, it finds niche applications in cosmetics, such as sunscreens, due to its UV-absorbing properties. Research continues into its potential use in advanced materials and photoresists for microelectronics.
Safety and Storage
While 4-Methoxybenzophenone is not classified as highly hazardous, proper handling is essential to minimize risks. Direct contact with skin or eyes may cause irritation, and inhalation of dust should be avoided. Always use gloves, goggles, and respiratory protection in industrial environments. Storage recommendations include keeping the compound in a tightly sealed container, away from light and moisture. Incompatible with strong oxidizing agents, it should be stored separately to prevent reactive hazards. Shelf life typically exceeds two years when stored under optimal conditions.
B2B Procurement Guide
When sourcing 4-Methoxybenzophenone, prioritize suppliers with ISO or GMP certifications to ensure product consistency and traceability. Key specifications to verify include purity (≥98%), CAS number (611-94-9), and absence of heavy metals or residual solvents. Bulk procurement (e.g., 25 kg drums) often reduces costs, but sample testing is advised for first-time buyers. Pricing varies based on order volume and purity; technical-grade material is commonly priced between $50-$150/kg. Consider logistics factors like shipping temperature controls for large orders to prevent degradation.
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