C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 5/07 (2006.01) C08K 5/5397 (2006.01) C09D 4/00 (2006.01) C09D 4/06 (2006.01)
Patent
CA 2523569
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 .alpha.-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.
L'invention concerne des formulations de revêtements pouvant être photo-réticulés, ces formulations contenant un absorbeur d'ultraviolets (UVA) hydroxyphénylbenzotriazole durable et/ou réagissant par décalage vers le rouge. Ces formulations sont photo-réticulées au moyen d'une combinaison de photoinitiateurs a-hydroxy kétone et oxyde de bisacylphosphine. Les UVA aptes à la réaction réagissent dans le revêtement après réticulation. La combinaison de photoinitiateurs oxyde de bis(2,4,6-triméthylbenzoyl)phénylphosphine et 1-hydroxycyclohexylphénylkétone est particulièrement efficace à cet effet.
Bramer David
Cliff Nancy Nase
Ravichandran Ramanathan
Renz Walter L.
Roberts Andrea R.
Ciba Specialty Chemicals Holding Inc.
Fetherstonhaugh & Co.
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