- Transition-metal-catalyzed process for the preparation of sterically hindered N-substituted alkoxy amines
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Sterically hindered N-substituted alkoxyamines are prepared by the transition-metal-catalyzed decomposition of diazonium salts in the presence of a sterically hindered nitroxyl radical. These compounds are useful as thermal and light stabilizers for a variety of organic substrates.
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- 4-Formyl amino-n-methylpiperidine derivatives, the use thereof as stabilisers and organic material stabilised therewith
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The present invention relates to 4-formylamino-N-methylpiperidine derivatives of the formula (I) where the variables are as defined in the Description, to a process for preparing these piperidine derivatives, to the use of these piperidine derivatives of the invention, or prepared according to the invention, for stabilizing organic material, in particular for stabilizing plastics or coating materials, and also to the use of these piperidine derivatives of the invention, or prepared according to the invention, as light stabilizers or stabilizers for wood surfaces. The present invention further relates to stabilized organic material which comprises these piperidine derivatives of the invention or prepared according to the invention.
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- Transition-metal-catalyzed process for the preparation of sterically hindered N-substituted aryloxyamines
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Sterically hindered N-substituted aryloxyamines are prepared by the transition-metal-catalyzed decomposition of diazonium salts in the presence of a sterically hindered nitroxyl radical. These compounds are useful as thermal and light stabilizers for a variety of organic substrates.
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- Oligomeric diarylbutadienes
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Oligomeric 4,4-diarylbutadienecarboxylates and -carboxamides of the formula I in which R1and R2independently of one another are hydrogen, an aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic radical or substituents which confer solubility in water, chosen from the group consisting of carboxylate, sulfonate or ammonium radicals; R3is an aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic radical or a radical which is bonded by a carbonyl, sulfonyl or a phosphonyl group, or is a carboxylate or a cyano group; Y is the group; in which R4is hydrogen, an aliphatic, cycloaliphatic, aromatic, araliphatic or heterocyclic radical and m is from 2 to 10, n is from 1 to 3, and x is the m-valent radical of a polyol having from 2 to 10 hydroxyl groups.
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- Bloom-resistant benzotriazole UV absorbers and compositions stabilized therewith
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Benzotriazole UV absorbers substituted with an ultra long ester or amide moiety wherein the ester or amide group is a hydrocarbyl group of 25 to 100 carbon atoms or is a group of alkyl of 25 to 100 carbon atoms interrupted by 5 to 39 oxygen atoms and terminated with an omega—OH or an omega—OR group exhibit excellent stabilization efficacy while they concomitantly do not bloom when incorporated into polyolefin films. These benzotriazole UV absorbers also provide excellent protection to white, dyed, dipped, unscented and/or scented candle wax from discoloration and degradation.
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- Piperidine-triazine compounds for use as stabilizers for organic materials
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The present invention relates to novel piperidine-triazine compounds of the general formula (I) in which R1 and R6 are e.g. isooctylamino or N-(2,2,6,6-tetramethyl-4-piperidyl)-butylamino, R2 and R5 are e.g. 2,2,6,6-tetramethyl-4-piperidyl, R3 and R4 are e.g. alkylene, R7 is e.g. a group m is zero or 1, n is zero, 1, 2, 3 or 4, p is 1 to 50, X is e.g. as defined for R1 and Y is e.g. a group The said compounds are effective as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials.
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