Claims
- 1. In a multilayer photoconductive element having a photoconductive insulating composition in electrical contact with a conducting layer, the improvement wherein said element comprises, as a component of said photoconductive composition, an amorphous, water-insoluble polyester which is substantially free of any acid functions and is selected from the group consisting of
- (a) polyesters having recurring units derived from at least one aromatic dicarboxylic acid component and at least one diol component, at least one of said acid or diol components being a non-linear monomer selected from the group consisting of an isophthalic acid component or a branched-chain alkylenediol having the formula
- HO--CH.sub.2 --R.sup.1 --CH.sub.2 --OH
- wherein R.sup.1 is a branched-chain alkylene group having from 2 to about 15 carbon atoms, and
- (b) polyester copolymers having recurring units derived from at least one aromatic dicarboxylic acid component and at least one diol component, at least one of said acid or said diol components being a mixture of at least two different acids or two different diols, respectively, so that a copolyester is obtained, and at least one of said acid or one of said diol components being selected from the group consisting of a non-linear monomer as defined above or a cycloaliphatic diol; with the provisos that (1) said photoconductive insulating composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the total dry weight of all binders contained in said photoconductive insulating composition and is within the range of from about 1 to about 40 weight percent based on the total dry weight of said photoconductive insulating compositions; and (2) said polyester and said other polymeric binder(s) together constitute an optically homogeneous mixture of binders.
- 2. In a multilayer photoconductive element having a photoconductive insulating composition in electrical contact with a conducting layer, the improvement wherein said element comprises, as a component of said photoconductive composition an amorphous, water-insoluble polyester copolymer being substantially free of all acid functions and having recurring units derived from at least one aromatic dicarboxylic acid component and at least one diol component, at least one of said acid or one of said diol components being a mixture of at least two different acids or two different diols, respectively, so that a copolyester is obtained, and at least one of said acid or one of said diol components being selected from the group consisting of a non-linear monomer or a cycloaliphatic diol, said non-linear monomer selected from the group consisting of an isophthalic acid component or a branched-chain alkylenediol having the formula
- HO--CH.sub.2 --R.sup.1 --CH.sub.2 --OH
- wherein R.sup.1 is a branched-chain alkylene group having from 2 to about 15 carbon atoms; with the provisos that (1) said photoconductive insulating composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the toal dry weight of all binders contained in said photoconductive insulating composition and is within the range of from about 1 to about 40 weight percent based on the toal dry weight of said photoconductive insulating composition; and (2) said polyester and said other polymeric binder(s) together constitute an optically homogeneous mixture of binders.
- 3. In a multilayer photoconductive element as defined in claim 2, the improvement which comprises selecting as said amorphous, water-insoluble polyester copolymer a polyester having an inherent viscosity greater than about 0.4 and containing repeating copolyester units representing each of the following structural formulas: ##STR6## wherein Ar represents an aromatic moiety, R.sup.1 represents branched-chain alkylene group having from 2 to about 15 carbon atoms and R.sup.3 represents a straight-chain alkylene group having from 1 to about 10 carbon atoms.
- 4. In a multilayer photoconductive element as defined in claim 2, the improvement wherein said polyester is a member selected from the group consisting of
- (a) a copolyester of terephthalate acid, ethylene glycol, and neopentyl glycol;
- (b) a copolyester of terephthalic acid, isophthalic acid, cyclohexanedimethanol, and ethylene glycol; and
- (c) a copolyester of terephthalic acid, isophthalic acid, and ethylene glycol.
- 5. A multilayer photoconductive element having an optically homogeneous organic photoconductive insulating composition in electrical contact with a conducting layer, said element comprising, as a component of said photoconductive composition, an amorphous, water-insoluble polyester copolymer being substantially free of any acid functions and containing repeating units represented by each of the following structural formulas: ##STR7## wherein Ar represents an aromatic moiety, R.sup.1 represents branched-chain alkylene group having from 2 to about 15 carbon atoms and R.sup.3 represents a straight-chain alkylene group having from 1 to about 10 carbon atoms; with the proviso that said homogeneous photoconductive composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the toal dry weight of all binders contained in said homogeneous photoconductive insulating composition and is within the range of from about 1 to 40 weight percent based on the toal dry weight of said homogeneous photoconductive composition.
- 6. A multilayer photoconductive element as defined in claim 5, wherein said polyester is a copolyester of terephthalic acid, ethylene glycol; and neopentyl glycol and has an inherent viscosity greater than about 0.4.
- 7. A multilayer photoconductive element having an optically homogeneous organic photoconductive insulating composition in electrical contact with a conducting layer, said element comprising, as a component of said photoconductive composition, an amorphous, water-insoluble polyester copolymer being substantially free of any acid functions and containing repeating units represented by each of the following structural formulas: ##STR8## wherein Ar represents an aromatic moiety, R.sup.1 represents branched chain alkylene group having from 2 to about 15 carbon atoms and R.sup.3 represents a straight-chain alkylene group having from 1 to about 10 carbon atoms; with the provisos that (1) said homogeneous photoconductive composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the total dry weight of all binders contained in said homogeneous photoconductive insulating composition and is within the range of from about 1 to 40 weight percent based on the total dry weight of said homogeneous photoconductive composition; and (2) said polyester and said other polymeric binder(s) together constitute an optically homogeneous mixture of binders.
- 8. A multilayer photoconductive element as defined in claim 7, wherein said polyester is a copolyester of terephthalic acid, ethylene glycol, and neopentyl glycol and has an inherent viscosity greater than about 0.4.
- 9. A multilayer photoconductive element having a multiphase aggregate photoconductive composition in electrical contact with a conducting layer, said element comprising, as a component of said photoconductive composition, an amorphous, water-insoluble polyester being substantially free of any acid functions and containing repeating units represented by each of the following structural formulas: ##STR9## wherein Ar represents an aromatic moiety, R.sup.1 represents branched-chain alkylene group having from 2 to about 15 carbon atoms and R.sup.3 represents a straight-chain alkylene group having from 1 to about 10 carbon atoms, with the proviso that said aggregate photoconductive composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the total dry weight of all binders contained in said photoconductive composition and is within the range of from about 1 to 40 weight percent based on the total dry weight of said aggregate photoconductive composition; and (2) said polyester and said other polymeric binder(s) together constitute an optically homogeneous mixture of binders.
- 10. A multilayer photoconductive element as defined in claim 9, wherein said polyester is a copolyester of terephthalic acid, ethylene glycol, and neopentyl glycol and has an inherent viscosity greater than about 0.4.
- 11. A multilayer photoconductive element having a multi-active photoconductive insulating composition,
- said composition having a charge generation layer containing an aggregate photoconductive material in electrical contact with a charge transport layer containing an organic photoconductor, in electrical contact with a conducting layer, said element comprising, as a component of said multi-active photoconductive composition, an amorphous, water-insoluble polyester copolymer being substantially free of any acid functions and containing repeating units represented by each of the following structural formulas: ##STR10## wherein Ar represents an aromatic moiety, R.sup.1 represents branched-chain alkylene group having from 2 to about 15 carbon atoms and R.sup.3 represents a straight-chain alkylene group having from 1 to about 10 carbon atoms; with the proviso that said aggregate photoconductive composition comprises a polymeric binder(s) other than said polyester so that said polyester constitutes about 1 to less than 50 percent by weight based on the total dry weight of all binders contained in said photoconductive composition and is within the range of from about 1 to 40 weight percent based on the total dry weight of said aggregate photoconductive composition; and (2) said polyester and said other polymeric binder(s) together constitute an optically homogeneous mixture of binders.
- 12. A multilayer photoconductive element as defined in claim 11, wherein said polyester is a copolyester of terephthalic acid, ethylene glycol, and neopentyl glycol and has an inherent viscosity greater than about 0.4.
Parent Case Info
This application is a continuation-in-part application of U.S. Patent Application Ser. No. 768,460, filed Feb. 14, 1977 now U.S. Pat. No. 4,173,472, which is a continuation-in-part application of U.S. Pat. Application Ser. No. 696,248 filed June 15, 1976, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (4)
Number |
Date |
Country |
792846 |
Aug 1968 |
CAX |
799555 |
Nov 1968 |
CAX |
1356004 |
Jun 1974 |
GBX |
1431415 |
Apr 1976 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Polyester Plasticizer for Films of Poly(N-vinyl carbazole) Xerox Disclosure Journal vol. #1, 1976, p. 31. |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
768460 |
Feb 1977 |
|
Parent |
696248 |
Jun 1976 |
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