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US 4,052,364 AGranted
Bis(hydroxy-di-tert.butylphenyl)-alkanoic acid esters
AssigneesNobel Hoechst Chimie, Hoechst Aktiengesellschaft
InventorsYani Christidis, Otto Mauz, Eberhard Prinz
Life of this patent
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Abstract
Bis(hydroxyphenyl)-alkanoic acid esters the phenyl radicals of which are alkylated twice are prepared by alkylation of corresponding compounds carrying one alkyl radical at the nucleus, using isobutylene as alkylating agent. The alkanoic acid esters are obtained in crystalline form and are suitable as stabilizers for polyolefins.
Claims3
A crystalline bis(hydroxy-di-tert-butylphenyl)-alkanoic acid diester of the formula I ##STR3## in which x is zero or a whole number in the range of from 1 to 8 and y is a whole number in the range of from 2 to 18.
Dependencies are inferred from the claim text.