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Overview
Benzophenone (BPP) is an aromatic ketone with the formula C13H10O, first synthesized in the 19th century. It is a versatile intermediate in organic chemistry and industrial applications due to its ability to absorb UV light and initiate photochemical reactions. Primarily produced via Friedel-Crafts acylation of benzene, BPP is a cost-effective compound with high stability. Its dual aromatic rings contribute to its UV-absorbing properties, making it indispensable in coatings and polymer industries.
Physical and Chemical Properties
BPP appears as white crystalline flakes or powder with a mild floral odor. It exhibits moderate volatility (vapor pressure: 0.0003 mmHg at 25°C) and low water solubility, favoring organic solvents like ethanol or acetone. Chemically, BPP is inert under ambient conditions but reacts with strong reducing agents. Its UV absorption peaks at 250-350 nm, enabling its role as a photoinitiator. The compound’s stability at high temperatures (up to 305°C) suits it for thermoplastic applications.
Main Applications
In UV-curable inks and coatings, BPP acts as a photoinitiator, accelerating polymerization under UV light. It is also used to fix fragrances in soaps and detergents, preventing rapid evaporation. The plastics industry employs BPP as a light stabilizer to prevent degradation in polyolefins. Additionally, it serves as a flavoring agent (FDA-approved) and a precursor for pharmaceuticals like antihistamines.
Safety and Storage
BPP poses mild toxicity (LD50 oral rat: 2,895 mg/kg) but can irritate skin and eyes. Proper PPE (gloves, goggles) is mandatory during handling. Store in sealed containers away from oxidizers and direct sunlight to prevent degradation. Regulatory compliance includes SDS documentation under REACH and EPA guidelines. Spills should be contained with inert absorbents and disposed of as hazardous waste.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering ≥99% purity with batch-specific COAs. Key certifications include ISO 9001 and REACH compliance. Bulk orders (1-ton pallets) typically reduce costs by 10-20%. Evaluate solvent content (if applicable) and particle size uniformity for coating applications. Spot-check CAS 119-61-9 authenticity via third-party testing to avoid counterfeit products.
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