Multi-active electrophotographic element and imaging process using free radicals as charge transport material
First Claim
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1. A multi-active electrophotographic element comprising:
- a charge-generation layer;
a charge-transport layer contiguous with said charge-generation layer, wherein said charge-transport layer comprises;
a stable free radical compound defined by the formula;
##STR3## wherein;
°
C. is a carbon atom with an unpaired electron andR1, R2, and R3 are the same or different and each represent a hydrogen, alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene, imino or halogen group;
or a substituted alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene or imino group;
or an alkyl, aryl, aralkyl, arylene, alkylene or heterocyclic arylene group linking two or more °
C. atoms;
or are themselves linked; and
a conductive support in electrical contact with either said charge-generation layer or said charge-transport layer.
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Abstract
The present invention relates to a multi-active electrophotographic element having a charge-transport layer containing stable free radical compounds as the charge-transport material. A process of forming images with this element is also disclosed.
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Citations
21 Claims
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1. A multi-active electrophotographic element comprising:
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a charge-generation layer; a charge-transport layer contiguous with said charge-generation layer, wherein said charge-transport layer comprises; a stable free radical compound defined by the formula;
##STR3## wherein;
°
C. is a carbon atom with an unpaired electron andR1, R2, and R3 are the same or different and each represent a hydrogen, alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene, imino or halogen group;
or a substituted alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene or imino group;
or an alkyl, aryl, aralkyl, arylene, alkylene or heterocyclic arylene group linking two or more °
C. atoms;
or are themselves linked; anda conductive support in electrical contact with either said charge-generation layer or said charge-transport layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multi-active electrophotographic element comprising:
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a charge-generation layer; a charge-transport layer contiguous with said charge-generation layer, wherein said charge-transport layer comprises; a polymeric binder; a stable free radical compound chosen from the group consisting of α
,γ
-bisdiphenylene-β
-phenylallyl,α
,γ
-bis(diphenylmethyl) biphenyl, and tris(4-E-tetrachlorophenyl)methyl wherein E represents an electron-withdrawing group such as halo, nitro, alkoxycarbonyl, trihalomethyl, cyano, keto, or sulfonyl; anda conductive support in electrical contact with said charge-generation layer.
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12. An electrophotographic process using a multi-active electrophotographic element comprising:
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a charge-generation layer; a charge-transport layer contiguous with said charge-generation layer, wherein said charge-transport layer comprises; a stable free radical compound defined by the formula;
##STR4## wherein;
°
C. is a carbon atom with an unpaired electron andR1, R2, and R3 are the same or different and each represent a hydrogen, alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene, imino or halogen group;
or a substituted alkyl, aryl, aralkyl, arylene, alkylene, heterocyclic arylene or imino group;
or an alkyl, aryl, aralkyl, arylene, alkylene or heterocyclic arylene group linking two or more °
C. atoms;
or are themselves linked; anda conductive support in electrical contact with either said charge-generation layer or said charge-transport layer, said process comprising; charging said element; exposing said charged element to activating radiation; and developing the charged and exposed element by applying charged toner particles to said element to produce a toned image. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification