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2,2,6,6-Tetramethyl-4-piperidyl carboxylic acid esters of aliphatic tetracarboxylic acids as stabilizers for synthetic polymers
| Details |
Inventors: Minagawa, Motonobu; Kubota, Naohiro; Shibata, Toshihiro;
Assignee: Argus Chemical Corporation (Brooklyn, NY)
Primary Examiner: Hoke; V. P.
Assistant Examiner:
Attorney, Agent or Firm:
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: ##STR1## wherein: R.sub.1 is selected from the group consisting of ##STR2## 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; R.sub.3 is selected from the group consisting of hydrogen and O; R.sub.6 is lower alkyl; A is selected from the group consisting of 1, 2, 3 and 4; B is selected from the group consisting of 0, 1, 2 and 3; A + b is equal to 4; and Z is a tetravalent aliphatic or cycloaliphatic radical carrying four ##STR3## WHERE R is R.sub.1 or R.sub.2, and can include from one to three hydroxyl groups OH. |
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DETAILED DESCRIPTION Having regard to the foregoing disclosures, the following is claimed as the inventive and patentable embodiments thereof: 1.
A 2,2,6,6-tetramethyl-4-piperidyl carboxylic acid ester of an aliphatic or cycloaliphatic tetracarboxylic acid having the general formula: ##STR78## wherein: R.
sub.
1 is selected from the group consisting of ##STR79## 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; R.
sub.
3 is selected from the group consisting of hydrogen and O; R.
sub.
6 is lower alkyl; a is selected from the group consisting of 1, 2, 3 and 4; b is selected from the group consisting of 0, 1, 2 and 3; a + b is equal to 4; and Z is a tetravalent aliphatic or cycloaliphatic radical having from two to about twenty-four carbon atoms and carrying four ##STR80## groups, where R is R.
sub.
1 or R.
sub.
2, and can include from one to three hydroxyl groups OH.
2.
A compound according to claim 1 in which a is 4 and b is zero.
3.
A compound according to claim 1 in which a is 2 and b is 2.
4.
A compound according to claim 1 in which R.
sub.
3 is hydrogen.
5.
A compound according to claim 1 in which R.
sub.
3 is O.
6.
A compound according to claim 1 in which R.
sub.
2 is alkyl having from one to six carbon atoms.
7.
A compound according to claim 1 in which R.
sub.
2 is phenalkyl having from seven to about fourteen carbon atoms.
8.
A compound according to claim 1 in which R.
sub.
1 is ##STR81## 9.
A compound according to claim 1 in which R.
sub.
1 is ##STR82## 10.
A compound according to claim 1 in which R.
sub.
1 is ##STR83## 11.
A compound according to claim 1 in which R.
sub.
1 is ##STR84## 12.
A compound according to claim 1 in which Z is alkylene having from two to about twenty-four carbon atoms.
13.
A compound according to claim 12 in which Z is propylene >CHCH.
sub.
2 CH<
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