Substituted 2-keto-1,4-diazacycloalkanes and uv light-...

Details Substituted 2-keto-1,4-diazacycloalkanes and uv light-... Substituted 2-keto-1,4-diazacycloalkanes and uv light-...

C - Chemistry, Metallurgy

08

K

400/7082, 31/71,

C08K 5/34 (2006.01) C07D 241/02 (2006.01) C07D 241/44 (2006.01) C07D 243/08 (2006.01) C07D 243/10 (2006.01) C08K 5/3442 (2006.01) C08K 5/36 (2006.01) C08L 1/08 (2006.01) C08L 101/00 (2006.01)

Patent

CA 1109185

ABSTRACT OF THE DISCLOSURE Novel polysubstituted 2-keto-1,4-diazacycloalkanes are powerful stabilizers for materials subject to ultraviolet (UV) light degradation, particularly for polyolefins. The cyclic 2-keto compounds of this invention have (a) a fixed two-carbon bridge between the N1 and N4 atoms of the diaza ring, the remaining portion of the ring having a variable length bridge of two or more carbon atoms, (b) an N-adjacent carbonyl in the fixed two-carbon bridge, and (c) at least one N4-adjacent carbon atom of the diaza ring is polysubstituted, that is, has two substituents which may be cyclizable. Compositions containing (a) the polysubstituted 2-keto-1,4-diaza- cycloalkanes of this invention, and (b) prior art polysubstituted 2-keto-1,4- diazacycloalkanes, exhibit excellent stability to UV light.

310538

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