| abstract |
SELECTED 2,2,6,6-TETRAMETHYL-4-PIPERIDINYL DERIVATIVES AND THEIR USE AS LIGHT STABILIZERS A 2,2,6,6-tetramethyl-4-piperidinyl derivative having a formula comprising: wherein R1 is hydrogen, an alkyl or alkylene group having 1 to about 8 carbon atoms, or cycloalkyl or aryl groups having about 5 or 6 ring carbon atoms; R2 and R3 are individually selected from hydrogen, alkyl groups having 1 to about 8 carbon atoms, and cycloalkyl and aryl groups having about 5 or 6 ring carbon atoms; R4 is selected from hydrogen and alkyl groups having 1 to about 8 carbon atoms; and n is either 1 or 2. These compounds are useful as UV light stabilizers in plastics and cosmetics (e.g. sunscreens). |