| 摘要 |
<p>Alpha-pyrone compounds are employed to provide colorless, lightfast ultraviolet radiation absorber materials. In addition to being normally colorless these materials are noncoloring due to their colorless decomposition products. The materials provide barriers for protection from ultraviolet radiation, and when incorporated in diazo-type reproduction materials, provide broad tonal gradations. Alpha-pyrones including an azocoupling group in the molecule may be combined with light-sensitive diazonium compounds to provide two-component diazo-type material without the inclusion of additional azocoupler compounds.</p> |
