2-Keto-1,4-diazacycloalkanes

Details 2-Keto-1,4-diazacycloalkanes 2-Keto-1,4-diazacycloalkanes

1979-10-26

1981-09-29

Bond, Robert T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2602393T, 2602393B, 2602393P, 544231, 544349, 544383, 544384, C07D24308

Patent

active

042922402

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.

REFERENCES:
patent: 4167512 (1979-09-01), Lai
patent: 4190571 (1980-02-01), Lai et al.
patent: 4207228 (1980-06-01), Lai et al.

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