摘要:
For preparing 1-oxa-diaza-oxo-spirodecanes of the formula ##STR1## where X.noteq.Y, standing for ##STR2## either a polyalkylpiperidone-4-cyanohydrine is reacted with an aldehyde or a ketone, or a polyalkyl-piperidone-4 is reacted with an aldehyde or ketone-cyanohydrine in a liquid aliphatic carboxylic acid as solvent.
摘要:
New 1-oxa-4,8-diazaspiro[4,5]decanes are prepared by reacting a dimethyl-dialkyl-piperidone with an .alpha.-hydroxyamide in the presence of a condensation catalyst. The compounds can be used as UV stabilizers for polymers.
摘要:
By incorporating a substituted diazadispiro-hexadecane into a plastic composition the heat and light stability of this composition is considerably increased.
摘要:
2,2-BIS-(ALKYL-4'-HYDROXYPHENYL)-CYCLOALKYL-(ALKYL) CARBONIC ACID ESTERS ARE PREPARED BY CONDENSATION OF ALKYL PHENOLS WITH 2-KETO-CYCLOALKYL CARBONIC ACID ESTERS IN THE PRESENCE OF ACIDIC CATALYSTS AND OPTIONALLY OF MERCAPTO DERIVATIVES. The product are useful for the stabilization of polymers against the decomposition by light and heat.
摘要:
The invention relates to copolymers of polyalkyl piperidines which are substituted by a polymerizable group and which have the formula ##STR1## with olefinic comonomers such as ethylene, styrene, vinyl acetate, acrylates or methacrylates. The copolymers which have a molecular weight of from 1,000 to 10,000 are used as light stabilizers for synthetic polymers which do not migrate to the surface of the polymers.
摘要:
The invention provides novel 4-carbamoyl derivatives of 1-oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and their preparation from 1 oxa-3-oxo-4,8-diaza-spiro-[4,5]-decanes and isocyanates. The products are suitable light stabilizers for thermoplastics.
摘要:
Novel derivatives of 2,2,6,6-tetraalkylpiperidone-4-oximes constitute excellent stabilizers for synthetic polymer compositions against the action of ultraviolet radiation and heat. The compounds can be used either per se or in admixture with known stabilizers.
摘要:
The invention relates to a process for the stabilization of halogen-free or halogen-containing synthetic polymers against the degradation by light and heat, which comprises the addition of special 1,3,5-triaza-7-adamantanyl ureas to the polymers.
摘要:
The invention provides novel derivatives of 2,2-dimethyl-6,6-dialkyl-4-hydroxy-4'-carbamoyl-piperidines which carry a substituent at the amide nitrogen atom, and optionally a further substituent at the ring nitrogen atom, and a process for preparing these compounds.The products, optionally in the form of salts, are used for stabilizing thermoplastics against the damaging influence of light.
摘要:
The invention provides novel esters of glycerol, in which one of the OH groups of the glycerol is esterified with a phenolcarboxylic acid, while the two other OH groups are esterified with phosphoric or phosphorous acid, substituted by long-chain alcohols, amines, mercaptans or phenol compounds. The products are suitable as light and heat stabilizers for plastics. They are distinguished by a high resistance to hydrolysis and extraction.