Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-12-12
1977-01-04
Terapane, John F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
44 70, 252407, 260 458N, 260 4585R, 2603095, 260473F, C07C14920, C07C 6976
Patent
active
040012999
ABSTRACT:
The compounds are esters having the formula ##EQU1## wherein R.sub.1 is alkyl, cycloalkyl, alkylthioethyl or alkylpolyoxyalkylene, R.sub.2 is the group ##SPC1##
R.sub.3 is hydrogen, alkyl, cycloalkyl or .alpha.-methylbenzyl, R.sub.4 is alkyl or cycloalkyl, R.sub.5 is hydrogen or alkyl, provided when R.sub.3 is hydrogen, R.sub.5 is alkyl and R.sub.4 is located on the carbon atom ortho to the hydroxyl group, A is a covalent carbon bond or lower alkylene, Q is the group ##SPC2##
R.sub.6 and R.sub.7 are independently hydrogen or alkyl, and Z is oxygen or sulfur.
The esters of this invention are prepared by usual esterification procedures from a substituted isopropanol and an acid or a derivative thereof, preferably the methyl ester.
The substituted isopropanols are prepared by the reaction of bis-glycidyl ethers of polyhydric phenols or of 1,3-diglycidyl derivatives of hydantoin with a mercaptide or alkoxide.
The compounds are useful as stabilizers for organic materials, especially polyolefins, which degrade upon exposure to light and heat.
Dexter Martin
Steinberg David Herbert
Ciba-Geigy Corporation
Hall Luther A. R.
Terapane John F.
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