Hoechst Aktiengesellschaft

Hoechst Aktiengellschaft

Josef Ertl

Hartmut Wiezer

Helmut Korbanka

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

Novel diazaspirodecanes of the general formula ##STR1## are prepared from known diazaspirodecane compounds and epoxy compounds or by reacting diazaspirodecane-substituted epoxy compounds with alcohols or amines and are excellent light stabilizers for synthetic polymers.

Substituted diazaoxaspirodecanes, preparation thereof and use thereof as

1-Oxa-3,8-diaza-4-oxo-spiro-[4,5]-decane compounds of the formula ##STR1## are new light stabilizers for protecting polymers from the damaging effect of UV radiation.

Process for preparing 1-oxa-3,8-diaza-4-oxo-spiro-[4,5]-decanes

1-Oxa-3-oxo-4,8-diaza-spiro[4,5]decane compounds of the formula ##STR1## are novel light stabilizers for protecting polymers from the damaging effect of UV radiation.

1-oxa-3-oxo-4,8-diaza-spiro(4,5)decane compounds

The reaction for the preparation of 1-oxa-3,8-diaza-4-oxo-spiro[4.5]decane compounds of the formula ##STR1## proceeds more rapidly and more completely if it is performed in the presence of a phase transfer catalyst in an aromatic hydrocarbon which is liquid at room temperature.

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Wertingen, Germany

Josef Ertl