DERIVATIVES of 2-hydroxybenzopheiione are used ex- tensively as light-stable absorbers of UV radiation for the protection of polymeric materials from degradation induced by sunlight. In the present work a variety of such compounds, designed to protect cotton and other cellulosic materials against the combined effects of light and microbial attack, have been made by attaching a phenolic residue to the 4-hydroxy-group in 2,4-dihydroxy- benzophenone via a linking ...