2,2,6,6-Tetramethyl-4-piperidyl carboxylic acid esters of aliphatic tetracarboxylic acids as stabilizers for synthetic polymers

摘要

2,2,6,6-TETRAMETHYL-4-PIPERIDYL CARBOXYLIC ACID ESTERS OF ALIPHATIC TETRACARBOXYLIC ACIDS ARE PROVIDED, USEFUL AS STABILIZERS FOR ORGANIC POLYMERIC MATERIALS, AND HAVING THE GENERAL FORMULA: wherein: P PR. sub.1 is selected from the group consisting of ##STR1## and when a is 2, 3, or 4, the R.sub.1 groups can be the same or different; R. sub.2 is selected from the group consisting of hydrogen; alkyl; alkenyl; cycloalkyl; alkcycloalkyl; cycloalkalkyl; aryl; aralkyl; and alkaryl; and when b is 2 or 3, the R. sub.2 groups can be the same or different; P PR.sub.3 is selected from the group consisting of hydrogen and O;PP R.sub.6 is lower alkyl; PPA IS SELECTED FROM THE GROUP CONSISTING OF 1, 2, 3 AND 4;PPB IS SELECTED FROM THE GROUP CONSISTING OF 0, 1, 2 AND 3;PP A + B IS EQUAL TO 4; AND Z is a tetravalent aliphatic or cycloaliphatic radical carrying four ##STR2## WHERE R is R. sub.1 or R. sub.2, and can include from one to three hydroxyl groups OH.