A. Castellan, C. Noutary, R. S. Davidson
Dec 27, 1994
Citations
0
Influential Citations
21
Citations
Journal
Journal of Photochemistry and Photobiology A-chemistry
Abstract
Abstract 2,4-dihydroxybenzophenone (DHB) is known to be a reasonably efficient UV screen for preventing the colour reversion of papers made from high-yield pulps. Attemps have been made to improve the performance of this material by increasing its compatibility with cellulose and by the introduction of cationic groups which will help it to locate in lignin-rich areas. The later has proved successful and the results show that, on a molar basis for the 2,4-dihydroxybenzophenone nucleus, the efficiency is increased by the introduction of ammonium and thiouronium groups. An interesting finding was that a 2,4-dialkyloxyderivative of benzophenone showed similar protective power to that observed for DHB