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US 6,610,856 B2Granted
Tinuvin P-hindred amine light stabilizer and derivatives thereof
AssigneeCouncil of Scientific and Industrial Research
InventorsShroj Al Mohitkumar Desai, Raj Pal Singh
Life of this patent
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Abstract
The present invention relates to a photo-stabilizer of the general formula (I): wherein R1 is hydrogen, halogen, C1 to C12 alkyl, alkoxy (linear and branched), R2 is hydrogen, C1-C8 alkyl, cyclopentyl, cyclohexyl or cumyl, R3 is hydrogen, C1-C4 alkyl, R4 is methyl or ethyl, R5 is C1-C8 alkyl, alkyl phenyl, alkoxy, acyl, cycloalkyl and allyl, X is O, NH, C1-C8 alkyloxy and alkylamino (linear or branched), to derivatives and intermediates thereof.
Claims2
A compound having formula (II)
- wherein R1 is hydrogen, halogen, C1 to C12 alkyl, alkoxy (linear and branched), R2 is hydrogen, C1-C8 alkyl, cyclopentyl, cyclohexyl or cumyl.
A compound having general formula (III)
- wherein R1 is hydrogen, halogen, C1 to C12 alkyl, alkoxy (linear and branched), R2 is hydrogen, C1-C8 alkyl, cyclopentyl, cyclohexyl or cumyl, and Y is tertbutyldimethylsilyl, tertbutyldiphenylsilyl, dimethylthexylsilyl, benzoyl, benzyl, and acetyl.
Dependencies are inferred from the claim text.