Hoechst Aktiengesellschaft

Norbert Mayer

Gerhard Pfahler

Hartmut Wiezer

Franz Scheidl

Otto Mauz

Harald Knorr

Gunther Illmann

Hans-Jurgen Arpe

Edgar Fischer

Heinz Litterer

Helmut Korbanka

Harald Haberlein

Gunther Nowy

The invention relates to a process for preparing p-chlorotoluene and/or m-chlorotoluene by ring-chlorination of toluene by using the following two pages (a) and (b) when further processing the toluene chlorination product composed of mixed isomers:

Process for preparing p-chlorotoluene and/or m-chlorotoluene

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.

Copolymers of substituted piperidines, their manufacture and use

The present invention relates to epoxide resins containing phenol groups and to homo-oligomers thereof of the structure ##STR1## that are obtained by reacting phenolcarboxylic acids with one epoxide equivalent of a polyepoxide. The new compounds are difficultly volatile and resistant to migration and can be used as stabilizers in synthetic polymers, in particular in poly-.alpha.-olefins.

Epoxide resins containing phenol groups, their manufacture and their use

The amide nitrogen of 9,9-dimethyl-2-oxa-4-oxo-3,8-diazaspiro-(4,5)-decane reacts with isocyanates or diisocyanates to give novel urea derivatives which can be used as light stabilizers for plastic materials.

Urea derivatives, process for their manufacture and their use as light

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.

Substituted piperidine hydroxamides, their preparation, and their use as

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.

Glycerol phosphites esterified with phenolcarboxylic acids

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 relates to mixed esters of phosphorous or phosphoric acid having on the one hand open chain polyalcohols and on the other hand long chain alkyl compounds with activated hydrogen, for example, alcohols, mercaptans and amines. The compounds are suitable as light and heat stabilizers for polyolefins and for chlorine-containing thermoplastic compositions and are furthermore distinguished by a high resistance to hydrolysis.

Phosphites of polyalcohols

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.

Urea derivatives, their preparation, and their use as light stabilizers

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.

N-substituted triaza-adamantanyl ureas as stabilizers for thermoplastic

Bis-(alkylphenol)-alkanecarboxylic acid hydrazides are obtained by reaction of bisphenol-alkanecarboxylic acid chlorides, azides, anhydrides or esters with hydrazine hydrate, at a temperature of from 5 to 200.degree. C. These hydrazides are excellent stabilizers for plastic materials, especially polyolefins.

Bis-(alkylphenyl)-alkanecarboxylic acid hydrazides, their preparation

7-[N-(2-alkylidenimino-isobutylamino)]-1,3,5-triazaadamantanes and 7-[N-(2-arylidenimino-isobutylamino)]-1,3,5-triazaadamantane are prepared from 7-amino-1,3,5-triazaadamantane by two condensation steps. The new compounds are very good stabilizers against decomposition of polymers by heat and UV-light.

Substituted triazaadmantane compounds

The invention is related to novel phosphites of sugar alcohols, their use as stabilizers for organic polymers, furthermore to stabilizer compositions containing these novel phosphites as well as the organic polymers stabilized therewith. The novel phosphites have a good stabilizing effect, especially in combination with known stabilizers, and they are substantially stable against hydrolytical influence. Their volatility and tendency to exudation are very weak.

Cyclic phosphites of sugar alcohols and polymers stabilized therewith

The present invention relates to novel phosphites of sugar alcohols, their use as stabilizers for organic polymers, to stabilizer compositions containing these novel phosphites and to the organic polymers being stabilized therewith. The novel phoshites have a good stabilizing effect, especially in combination with known stabilizers, and they are substantially stable to hydrolysis.

Phosphites of sugar alcohols and polymers stabilized therewith

Derivatives of 1-oxa-3,8-diaza-spiro-[4,5]-decane, which be prepared by reacting a 2,2-dimethyl-6,6-dialkyl-4-hydroxy-4-carbamoylpiperidine with an aldehyde or ketone, are excellently suitable as light stabilizers for organic materials.

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Gersthofen, Germany

Norbert Mayer