Ciba Specialty Chemicals Corporation

Deborah Judd

Stephen D Pastor

Mervin Gale Wood

Joseph Suhadolnik

Ramanathan Ravichandran

Robert E Detlefsen

Joseph E Babiarz

Rong Xiong

Andrew Brian Naughton

Anthony David Debellis

Sai Ping Shum

Andrea R Smith

The present invention relates to novel ultraviolet light absorbers of the benzoxazinone, oxanilide, benzylidene malonate, quinazoline and benzotriazole classes. The invention also relates to polymer and photographic compositions stabilized against the deleterious effects of light induced degradation which comprise the novel ultraviolet light absorbers.

Ultraviolet light absorbers

Provided is a novel one-pot, organic solvent-free process for the preparation of 2-(2-nitrophenylazo) substituted phenols. The 2-(2-nitrophenylazo) substituted phenols are precursors for hydroxyphenylbenzotriazole UV absorbers.

Organic solvent-free process for the preparation of 2-(2-nitrophenylazo)phenols

White, dyed, dipped, unscented and/or scented candle wax is effectively stabilized against discoloration and fading by the incorporation therein of a triazine-based piperazinone stabilizer in combination with a UV absorber and/or an antioxidant.

Candle wax stabilized with piperazinones

Sterically hindered N-substituted aryloxyamines are prepared by the Keggin polyoxometalate or the transition metal substituted polyoxometalate (TMS-POM) catalyzed decomposition of diazonium salts in the presence of a sterically hindered nitoxyl radical. These compounds are useful as thermal and light stabilizers for a variety of organic substrates.

Polyoxometalate catalysts for the preparation of sterically hindered N-substituted aryloxyamines

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Poughkeepsie, NY, United States of America

Deborah Judd