Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1998-12-10
2001-04-10
Michl, Paul R. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S359000, C524S360000
Reexamination Certificate
active
06214915
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Not applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention pertains to resin compositions which are stabilized against degradation and/or discoloration by an effective amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound. The resin compositions may optionally contain a stabilizer or mixture of stabilizers of at least one stabilizer selected from the group consisting of the phenolic antioxidants, the 3-arylbenzofuranones, the hindered amine stabilizers, the ultraviolet light absorbers, the tertiary amine oxides, the organic phosphorus compounds, the alkaline metal salts of fatty acids, the hydrotalcites, the epoxydized soybean oils, the hydroxylamines, the tertiary amine oxides, thermal reaction products of tertiary amine oxides, and the thiosynergists.
2. Brief Description of the Related Art
Although various antioxidants have long been known to be effective stabilizers for polymeric resins and have enjoyed wide commercial success for that use, these same stabilized polymeric resin compositions continue to degrade during high temperature processing such as during compounding and processing into articles of commerce.
While the addition of organic phosphites to such resin compositions stabilized with phenolic antioxidants tends to reduce the degradation, it remains a serious practical problem.
Likewise polymeric resin compositions containing certain phenolic antioxidants and hindered amine stabilizers tend to degrade, especially when subjected to repeated extrusions. Although such stabilized resin compositions are improved, there continues to exist a need and desire to provide polymeric resin compositions which exhibit enhanced levels of stability and to provide alternate stabilizer compositions for incorporation into polymer compositions.
Aromatic ketones, e.g., 2-bromo-9-anthrone and 2-ethyl-9-anthrone, have been reported as useful as sensitizers to increase the photopolymerization rate of photosensitive compounds, e.g. oxadiazole compounds, when used in combination with a photoinitiator. Skin conditions such as warts and psoriasis have also been treated with 1,8-dihydroxy-anthrone.
The use of aromatic ketones, as well as adducts and derivatives of aromatic ketone compounds, until this time as stabilizer additives for polymeric resins, however, is believed to be novel, especially when used in combination with other additives.
SUMMARY OF THE INVENTION
The broad object of the instant invention is to provide a polymeric resin composition that contains an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, effective to stabilize the composition against degradation, especially degradation during high temperature processing (e.g., melt processing) such as during compounding and/or processing into articles of commerce. The compositions of the present invention may also contain more than one aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, effective to stabilize the composition against degradation, especially degradation during high temperature processing such as during compounding and/or processing into articles of commerce.
In a first preferred embodiment of the invention, the aromatic ketone compound is anthrone, anthralin, a derivative of anthrone, a derivative of anthralin, an adduct of anthrone, an adduct of anthralin, or a mixture containing any of the foregoing.
In a second preferred embodiment of the invention, a polymeric resin composition stabilized against degradation is provided containing an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, which also contains a stabilizer or mixture of stabilizers selected from the group consisting of the phenolic antioxidants, the 3-arylbenzofuranones, the tertiary amine oxides, the hindered amine stabilizers, the ultraviolet light absorbers, the organic phosphorus compounds, the hydroxylamines, the tertiary amine oxides, thermal reaction products of tertiary amine oxides, and the thiosynergists.
In a third preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, and a phenolic antioxidant effective to stabilize the resin composition.
In a fourth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, a tertiary amine oxide, and a phenolic antioxidant effective to stabilize the resin composition.
In a fifth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, an organic phosphorus compound, and a phenolic antioxidant effective to stabilize the resin composition.
In a sixth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, and a 3-arylbenzofuranone effective to stabilize the resin composition.
In a seventh preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, and at least one of an alkaline metal salt of a fatty acid, a hydrotalcite, or epoxydized soybean oil, or one of the foregoing and a phenolic antioxidant effective to stabilize the resin composition.
In a eighth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, an alkaline metal salt of a fatty acid or said metal salt, a hydroxylamine, and a phenolic antioxidant effective to stabilize the resin composition.
In a ninth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, a phenolic antioxidant and a hindered amine stabilizer effective to stabilize the resin composition.
In a tenth preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, a phenolic antioxidant and an ultraviolet light absorber effective to stabilize the resin composition.
In a eleventh preferred embodiment of the invention, is provided a resin composition which is stabilized against degradation upon exposure to heating wherein the resin composition contains a combination of an amount of an aromatic ketone compound, including adducts and derivatives of an aromatic ketone compound, a phenolic antioxidant, an ultraviolet light absorber, and an organic phosphorus compound effective to stabilize the resin composition.
In a twelfth preferred embodiment of the invention, is provided a resin composition which is stabilized against degra
Avakian Roger W.
Enlow William P.
Gray Carloss L.
Mahood James A.
Prabhu Vaikunth S.
General Electric Company
Michl Paul R.
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