Ciba Specialty Chemicals Corporation

Basf Se Corporation

Igm Malta Limited

David Bramer

Ramanathan Ravichandran

Mervin Gale Wood

Joseph Suhadolnik

Anthony DeBellis

Jacqueline Lau

Walid Al-Akhdar

Donald A Wostratzky

Eugene Valentine Sitzmann, Jr

Jean-Pierre Wolf

Nancy N Cliff

Suruliappa Gowper Jeganathan

Walter L Renz

Eugene Valentine Sitzmann

Redina Kote

Eugene Sitzman

Greg Losapio

Andrea Roberts

Gajanan J Maladkar

Nancy Nase Cliff

Andrea R Roberts

Novel fluorescent polyhedral oligomeric silsesquioxane (POSS) colorants are provided. The colorants are strongly fluorescing and long lasting with excellent light stability. The novel colorants can be prepared from chromophores found in common pigments and provide a simple way to convert an insoluble pigment into a soluble fluorescent colorant.

Polyhedral oligomeric silsesquioxane (POSS) based fluorescent colorants

Photo-curable coating formulations which comprise a durable and/or red-shifted reactable hydroxyphenylbenzotriazole ultraviolet light absorber (UVA) are effectively photocured employing a combination of &#x3b1;-hydroxy ketone and bisacylphosphine oxide photoinitiators. The reactable UVA's are reacted into the coating upon curing. The combination of the photoinitiators bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide and 1-hydroxycyclohexylphenylketone is especially effective for this purpose.

Photo-cured and stabilized coatings

Optical fiber coating compositions which comprise at least one ethylenically unsaturated polymerizable compound and a photoinitiator blend, wherein the blend comprises (a) bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide and (b) 2,4,6,-trimethylbenzoylethoxyphenylphosphine oxide in an (a):(b) weight:weight ratio of between about 1:10 and about 1:8; or (c) bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, (d) 2,4,6,-trimethylbenzoylethoxyphenylphosphine oxide and (e) 2-hydroxy-2-methyl-1-phenyl-1-propanone in a (c):(d):(e) weight:weight:weight ratio between about 3:1:14 and about 4:1:16; or (f) bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide and (g) 2-hydroxy-2-methyl-1-phenyl-1-propanone in a (f):(g) weight:weight ratio of between about 1:3 and about 1:5 exhibit fast photospeed, very low color and fast photobleaching. The photoinitiator blends have low volatility, high shelf life stability and high compatibility with resins and monomers. The photoinitiator blends are for example liquid and easy to use.

Optical fiber coatings

The present invention relates to a novel photoinitiator system comprising one or more acylphosphine oxide photoinitiators and one or more lightfast red, blue or violet organic pigments. Low yellow color formation results upon curing ethylenically unsaturated compounds with the new photoinitiator system. Particular applications include clear and white coatings, screen inks, gel coats, powder coatings, composites, adhesives and lenses.

Phosphine oxide photoinitiator systems and curable compositions with low color

2H-Benzotriazole UV absorbers substituted at the 3-position or at the 5-position of the phenyl ring by a 1,1-diphenylalkyl moiety, particularly a 1,1-diphenylethyl group, are particularly photostable in automotive coatings, and are of low color and exhibit low volatility in thermoplastic compositions.

2H-benzotriazole UV absorbers substituted with 1,1-diphenylalkyl groups and compositions stabilized therewith

2H-benzotriazole UV absorders substituted with 1,1-diphenylalkyl groups and compositions stabilized therewith

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Putnam Valley, NY, United States of America

David Bramer