Substituted 2-keto-1,4-diazacycloalkanes and UV-light-stabilized

Details Substituted 2-keto-1,4-diazacycloalkanes and UV-light-stabilized Substituted 2-keto-1,4-diazacycloalkanes and UV-light-stabilized

1977-09-21

1980-02-26

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106176, 260 458NT, 260 4585B, 544357, 544360, 544384, C08K 534

Patent

active

041905717

ABSTRACT:
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 N.sup.1 and N.sup.4 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 N.sup.4 -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-diazacycloalkanes of this invention, and (b) prior art polysubstituted 2-keto-1,4-diazacycloalkanes, exhibit excellent stability to UV light.

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Egg, "Monatshefte fur Chemie", 106, (1975), pp. 1167-1173.

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