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US 5,844,025 AGranted
1,2-Bis-adducts of stable nitroxides with substituted ethylenes and stabilized compositions
AssigneeCiba Specialty Chemicals Corporation
InventorsGlen Thomas Cunkle, Thomas F. Thompson, Volker H. von Ahn, Roland A. E. Winter
Life of this patent
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Abstract
1,2-Bis-adducts of stable hindered nitroxide compounds with substituted ethylenes are prepared by reacting two equivalents of nitroxyl compound with an ethylenically unsaturated compound such as styrene or an acrylate ester. These adducts are very effective inhibitors to prevent the premature polymerization of ethylenically unsaturated monomers when such monomers are distilled, processed or stored.
Claims4
A stabilized composition which comprises the following components (a) and (b):
- (a) polypropylene, polyethylene or a polymer, copolymer or polymer blend which is or comprises at least one polymer which contains ethylenic unsaturation, and
- (b) an effective stabilizing amount of a compound of formula I or II ##STR2## where R.sub.1 and R.sub.2 are independently alkyl of 1 to 4 carbon atoms, or R.sub.1 and R.sub.2 together are pentamethylene,
- E is aryl of 6 to 10 carbon atoms, or said aryl substituted by alkyl of 1 to 4 carbon atoms or by halogen, or E is --COOH or --COOR.sub.6 where R.sub.6 is alkyl of 1 to 18 carbon atoms or hydroxyalkyl of 2 to 8 carbon atoms, or E is --CN,
- R.sub.3, R.sub.4 and R.sub.5 are independently alkyl of 1 to 4 carbon atoms, and
- T is a group needed to complete a 5-, 6- or 7-membered ring or an 1,1,3,3-tetramethylisoindoline moiety, where said T group is unsubstituted or substituted by hydroxyl, by oxo, by --OR.sub.8 where R.sub.8 is alkyl of 1 to 18 carbon atoms, or by --O--CO--R.sub.9 where R.sub.9 is alkyl of 1 to 17 carbon atoms or phenyl.
2 more elements
Dependencies are inferred from the claim text.