Polyolefin compositions stabilized with thiodiorganic esters and hydroxyspirohydrindenes

Claim 1

A COMPOSITION COMPRISING (1) AN ESTER OF A DIALKANOIC ACID SELECTED FROM THE CLASS CONSISTING OF DIESTERS THIODIGLYCOLLIC THIODIPROPIONIC AND THIODIBUTYRIC ACIDS WITH AN ALIPHATIC ALCOHOL CONTAINING FROM TEN TO TWENTY CARBON ATOMS, AND (2) A HYDROXYSPIROHYDRINDENE HAVING THE FORMULA: SUBSTITUTED 1,1''-SPIROBIINDANE IN WHICH AT LEAST ONE SUBSTITUENT AT POSITIONS 5 AND 6 AND AT LEAST ONE OF THE SUBSTITUENTS AT POSITIONS 5'' AND 6'' IS A HYDROXYL GROUP, THE OTHERS BEING SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, ALKOXYL AND HYDROXYL GROUPS AND HYDROGEN ATOMS, AND IN WHICH THERE IS ADJACENT TO AT LEAST ONE OF SAID HYDROXYL GROUPS IN EACH BENZENE RING A SUBSTITUENT SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON, ALKOXYL AND HYDROXYL GROUPS AND IN WHICH ONE SUBSTITUENT AT EACH OF POSITIONS 2 AND 2'' IS A HYDROGEN ATOM, THE OTHER SUBSTITUENTS R- AND R'' - RESPECTIVELY BEING SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON GROUPS AND HYDROGEN ATOMS, AND THE SUBSTITUENTS AT POSITIONS 3 AND 3'' ARE IN EACH CASE PRIMARY HYDROCARBON GROUPS R" CH2- AND R"'' CH2-, RU AND RU BEING SELECTED FROM THE CLASS CONSISTING OF HYDROCARBON GROUPS AND HYDROGEN ATOMS, THERE BEING FROM ONE TO TEN HYDROXYL ATOMS PROVIDED TO THE COMPOSITION BY THE HYDROXYSPIROHYDRINDENE TO EACH SULFUR ATOM PROVIDED TO THE COMPOSITION BY THE THIODIALKANPOIC ACID ESTER.