Difference between revisions of "Hindered amine light stabilizer"
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== Description == | == Description == | ||
| − | A class of [ | + | A class of [[antioxidant]] added to [[varnish|varnishes]] and [[polymer|polymers]] to minimize photochemical degradation. Hindered amine light stabilizers (HALS) act as a catalyst to deactivate the peroxy radicals. Thus, they are effective without being consumed. Many HALS additives are derivatives of 2,2,6,6-tetramethylpiperidine. (Mills and White 1994). |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 13:24, 16 January 2014
Description
A class of Antioxidant added to varnishes and polymers to minimize photochemical degradation. Hindered amine light stabilizers (HALS) act as a catalyst to deactivate the peroxy radicals. Thus, they are effective without being consumed. Many HALS additives are derivatives of 2,2,6,6-tetramethylpiperidine. (Mills and White 1994).
Synonyms and Related Terms
HALS; Tinuvin 292 [Ciba-Geigy]; Chimasorb 944 [Ciba-Geigy]; Mixxim 57 [Fairmont];
Additional Information
° R.de la Rie, "Polymer Stabilizers. A Survey with Reference to Possible Applications in the Conservation Field" Studies in Conservation 33:9-22,1988. ° J.S. Mills, R.White, The Organic Chemistry of Museum Objects, Butterworth Heinemann, London, 1994.
Authority
- John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994
- External source or communication Comment: R.de la Rie, C.McGlinchy "Stabilized Dammar Picture Varnish" Studies in Conservation 34:137-146