Heterocyclic benzoate ultraviolet stabilizers and their use in organic compositions
AssigneeEastman Kodak Company
InventorsGether Irick, Jr., Charles A. Kelly
Life of this patent
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Abstract
The invention relates to heterocyclic benzoate compounds which have been found to be effective ultraviolet stabilizers. The invention also relates to ultraviolet degradable organic compositions containing an amount of a heterocyclic benzoate composition to prevent such degradation. These stabilizers are effective in the presence of other additives commonly employed in polymeric compositions including, for example, pigments, colorants, fillers, reinforcing agents and the like. These ultraviolet stabilizers may be incorporated into the organic compositions such as polymers by adding to the polymer melt or dissolved in the polymer dope, coated on the exterior of the shaped or molded article, film or extruded fiber.
Claims45
An organic composition susceptible to ultraviolet light degradation stabilized against such degradation with a stabilizing amount of at least one ester of a heterocyclic aromatic acid compound having the following formula:
- ##STR15## wherein A is a group having the structure ##STR16## wherein X and Y are a carbon atom or a nitrogen atom;
- Z is an oxygen atom, a sulfur atom, a nitrogen atom, or a nitrogen atom containing a hydrogen atom or a substituted or unsubstituted lower alkyl group having 1 to 12 carbon atoms;
- R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen, chloro, bromo, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, substituted amino, cyano, and the substituents R.sub.1 and R.sub.2, R.sub.2 and R.sub.3, and R.sub.3 and R.sub.4, combined with the carbon atoms to which they are attached are joined alkylene groups completing a carbocyclic ring, which ring can also be substituted with one or more of the substituents listed above for R.sub.1, R.sub.2, R.sub.3 and R.sub.4 ;
- I is the same as R.sub.1, R.sub.2, R.sub.3 and R.sub.4 and is present on all positions of the benzenoid ring, except the carbon atom attached to the Y substituent and the carbon atom attached to the carboxyl group connecting the heterocyclic aromatic A group with the aromatic B group, said carbonyl connecting group is attached to the benzenoid ring in either the meta or para position from the carbon atom connected to the Y substituent;
- and
- B is a group having the formula:
- ##STR17## wherein:
- at least one R.sub.5 or R.sub.9 is hydrogen and the other R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are hydrogen, lower alkyl, substituted lower alkyl, cycloalkyl, substituted cycloalkyl, aryl, substituted aryl, lower alkylaryl, aryl-substituted-aryl, alkoxy, substituted amino, carboalkoxy, nitrile, chloro, bromo and the substituents R.sub.5 and R.sub.6, R.sub.6 and R.sub.7, R.sub.7 and R.sub.8, R.sub.8 and R.sub.9 combined with the carbon atoms to which they are attached are joined alkylene groups completing a carbocyclic ring which can be substituted with any of the substituents listed above for R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.9.
Dependencies are inferred from the claim text.