Hoechst Aktiengesellschaft

Helmut Korbanka

Hartmut Wiezer

Gerhard Pfahler

Franz Scheidl

Hilmar Mildenberger

Thomas Maier

Norbert Mayer

Harald Knorr

Gunther Illmann

Josef Ertl

Werner Strassberger

Karl-Heinz Stetter

Josef Strehle

Otto Malitschek

Rolf Jacob

The present invention relates to oligomeric tetraalkylpiperidine light stabilizers for polymers, to the preparation thereof from known polyalkyldiazaspirodecanes and epoxides, and to the use thereof for stabilizing polymers against the damaging effect of light, heat and oxygen.

Oligomeric diazaoxaspirodecanes, preparation thereof and use thereof as

Diazaspirodecanes of the general formulae ##STR1## are reacted with epoxides or aldehydes to give alcohols and the latter are reacted with bifunctional compounds to form oligomers or polymers which can be used as light stabilizers for synthetic polymers. The alcohols can also be obtained if epoxy compounds which are substituted by the above diazaspirodecanes are converted into their formic acid esters and the latter are saponified.

Substituted diazaspirodecanes, their preparation and their use as

Low-melting, easily processable and at the same time hard polar waxes are obtained by treating copolymers, which are composed of ethylene and 0.5 to 50% by weight of a monomer containing oxygen-containing groups and have melt indices (MFI 190/2) of between 0.01 and 400 g/10 minutes, in the molten state, dispersed in a dispersing agent which is inert towards oxygen, with oxygen or oxygen-containing gases. Preferably, ethylene/vinyl acetate copolymers are oxidized, and these oxidation products are particularly suitable as the wax component in water-based and/or organic solvent-based polishes and in pastes.

Process for the preparation of oxidation products of ethylene

1,2,4-triazole is obtained by cyclization of N,N'-diformylhydrazine with ammonia in the presence of formamide. The amount of ammonia required is either formed in situ from thermally decomposable ammonium salts, or supplied by feeding in gaseous ammonia. Simultaneously, the water of reaction is constantly distilled off from the system.

Process for the preparation of 1,2,4-triazole

The invention provides novel organotin compounds and their preparation by reaction of organotin halides with mercaptans, thiocarboxylic acid esters, carboxylic acids or carboxylic acid partial esters. Suitable organotin halides are those obtained by reaction of Sn+HCl with an olefin which carries a carbonyl group in adjacent position to the olefinic double bond and which is substituted in addition by at least one carboxylate group not adjacent to the double bond. The novel compounds are used as starting for stabilizing halogen-containing polymers without influencing their transparency.

Organotin compounds, the preparation and use thereof

By reacting polyalkyl-piperidones-4 with the 0.5- to 1.1-molar amount of formaldehyde in the presence of an aliphatic monoalcohol at 50.degree. to 180.degree. C., polymers of a polymerization degree of from 2 to about 200 are obtained, which may be hydrogenated or partially hydrogenated. Especially in this form, they are suitable as light stabilizers for synthetic polymers and as intermediate products for the preparation of other stabilizers for plastic materials.

Novel polyalkyl-piperidine polymers, their preparation and use

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.

Process for the manufacture of aza-spirodecanes

The invention provides novel organotin halides obtained by reaction of tin and hydrogen chloride with those olefins which carry a carbonyl group in adjacent position to the olefinic double bond and which are substituted in addition by at least one carboxylate group not adjacent to the double bond.

Organotin halides

By oxidation of straight-chained alpha-olefins having 16 to 70 carbon atoms with chromosulfuric acid, the corresponding aliphatic monocarboxylic acids are prepared without noteworthy degradation. The compounds obtained are suitable, inter alia, for making waxy esters or metal soaps which can be worked up into floor polishes or lubricants for plastic materials.

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Adelsried, Germany

Helmut Korbanka