Charge injection barrier for positive charging organic photoconductor
AssigneeHewlett-Packard Company
InventorKhe C. Nguyen
Life of this patent
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Abstract
In organic photoconductors (OPC's) for electrophotography, a barrier layer is placed on top of the OPC. The barrier may have 2 layers--1, an electron withdrawing layer on top of the OPC; and,--2, an electron donating layer on top of the electron withdrawing layer. The barrier layer comprises: 1. a crosslinked polymer binder; 2. a charge injection prohibiter molecule, and optionally; 3. an electron withdrawing molecule. This formulation has resulted in a long-life OPC with more than 50,000 good cycles at high severity test conditions. The OPC had not only long life during continuous use, but also long shelf life and long on-again/off-again operation life.
Claims21
A barrier layer for a photoconductor used in electrophotography, said barrier layer comprising:
- a cross-linking organic binder material comprising polyvinyl alcohol (PVA), and
- a positive charge injection prohibiting molecule selected from the group consisting of amino compounds having the general formulas:
- NH.sub.2 --R.sub.1 --(NR.sub.2).sub.n --R.sub.3 ( 9)
- NH.sub.2 --A (NR.sub.2).sub.n --R.sub.3 ( 10)
- NH.sub.2 --R.sub.1 --(NHR.sub.2).sub.n --Si(OR.sub.5).sub.3( 11)
- NH.sub.2 --A--Si(OR.sub.5).sub.3 ( 12),
- or from the group of hydroxy or mercapto compounds having the general formulas:
- HO--R.sub.1 --COOR.sub.2 ( 13)
- HS--R.sub.1 --COOR.sub.2 ( 14)
- R.sub.1 --R.sub.2 (OH).sub.n --R.sub.3 ( 15)
- R.sub.1 --R.sub.2 (SH).sub.n --R.sub.3 ( 16)
- NH.sub.2 --R.sub.1 (OH).sub.m --(NR.sub.2).sub.n --R.sub.3 ( 17)
- NH.sub.2 --A(OH).sub.m --(NR.sub.2).sub.n --R.sub.3 ( 18),
- where, for formulas 9-18 above:
- R.sub.1, R.sub.3, R.sub.5 =alkyl, alkoxy, allyl, aryl with and/or without the following substituent groups:
- --NO.sub.2, --CN, --OH, --SH, --SO.sub.2, --SOCl.sub.2, --S, .dbd.C.dbd.O, --COOR, --CHO, --Cl, --Br, --I, --F;
- R.sub.2 =hydrogen, alkyl, alkoxyl, aryl with and/or without the following substituent groups --NO.sub.2, --CN, --OH, --SH, --SO2, --SOCl.sub.2, --S, .dbd.C.dbd.O, --CHO, --COOR, --Cl, --Br, --I, --F;
- A=heterocyclic compounds selected from the following groups;
- ##STR11## , and m, n=0,1,2 . . . 5.
A barrier layer for a photoconductor used in electrophotography, said barrier layer comprising:
- a cross-linking organic binder material comprising polyvinyl butyral (PVB), and
- a positive charge injection prohibiting molecule selected from the group consisting of amino compounds having the general formulas:
- NH.sub.2 --R.sub.1 --(NR.sub.2).sub.n --R.sub.3 ( 9)
- NH.sub.2 --A (NR.sub.2).sub.n --R.sub.3 ( 10)
- NH.sub.2 --R.sub.1 --(NHR.sub.2).sub.n --Si(OR.sub.5).sub.3( 11)
- NH.sub.2 --A--Si(OR.sub.5).sub.3 ( 12),
- or from the group of hydroxy or mercapto compounds having the general formulas:
- HO--R.sub.1 --COOR.sub.2 ( 13)
- HS--R.sub.1 --COOR.sub.2 ( 14)
- R.sub.1 --R.sub.2 (OH).sub.n --R.sub.3 ( 15)
- R.sub.1 --R.sub.2 (SH).sub.n --R.sub.3 ( 16)
- NH.sub.2 --R.sub.1 (OH).sub.m --(NR.sub.2).sub.n --R.sub.3 ( 17)
- NH.sub.2 --A(OH).sub.m --(NR.sub.2).sub.n --R.sub.3 ( 18),
- where, for formulas 9-18 above:
- R.sub.1, R.sub.3, R.sub.5 =alkyl, alkoxy, allyl, aryl with and/or without the following substituent groups:
- --NO.sub.2, --CN, --OH, --SH, --SO.sub.2, --SOCl.sub.2, --S, .dbd.C.dbd.O, --COOR, --CHO, --Cl, --Br, --I, --F;
- R.sub.2 =hydrogen, alkyl, alkoxyl, aryl with and/or without the following substituent groups --NO.sub.2, --CN, --OH, --SH, --SO.sub.2, --SOCl2, --S, .dbd.C.dbd.O, --CHO, --COOR, --Cl, --Br, --I, --F;
- A=heterocyclic compounds selected from the following groups:
- ##STR12## , and m, n=0,1,2 . . . 5.
Dependencies are inferred from the claim text.