\▐ben-zō-fi-▐nōn, -▐fē-▐nōn\ n [ISV benz- + phen- + -one] (1885) (1) (diphenylketone) An involati le solvent and chemical intermediate. (2) Any of a family of UV stabilizers based on substituted 2-hydroxybenzophenone (“B”). Typical members are 4-methoxy-B, 4-octyloxy-B, 4-dodecyloxy-B, 2,2′-dihydroxy-4-methoxybenzophenone, and 2,2′-dihydroxy-4,4′-dimethoxybenzophenone. They function both as direct UV absorbers and, in the case of polyolefins, also as energy-transfer agents and radical scavengers. It is an aromatic ketone having excellent general compatibility. It is a solid at ordinary temperature, has a mp of 48°C, and a bp of 305°C. It is insoluble in water. Open image in new window
Known also as Diphenyl Ketone.