1. A photoconductor comprising a supporting substrate, a photogenerating layer, and at least one charge transport layer, and wherein said photogenerating layer includes a carbazole represented by
wherein R1, R2 and R3 are independently at least one of hydrogen, halogen, alkyl, aryl, benzoyl, carboxaldehyde arylhydrazone, and amino.
2. A photoconductor in accordance with claim 1 wherein said carbazole is present in an amount of from about 0.1 to about 30 weight percent, and said alkyl contains from 1 to about 25 carbon atoms; and said aryl, benzoyl, and arylhydrazone contain from 6 to about 36 carbon atoms.
3. A photoconductor in accordance with claim 1 wherein said at least one charge transport layer is 1 layer, 2 layers, or 3 layers, and said R1, R2, and R3 are alkyl, aryl, or halogen.
4. A photoconductor in accordance with claim 1 wherein said at least one charge transport layer is one layer or two layers, and said R1, R2, and R3 are alkyl, aryl, or halogen.
5. A photoconductor in accordance with claim 1 wherein said carbazole is N-ethylcarbazole present in an amount of from about 1 to about 20 weight percent.
6. A photoconductor in accordance with claim 1 wherein said R is one of methyl, ethyl, vinyl, benzoyl, carboxaldehyde diphenylhydrazone, carboxaldehyde N-benzyl-N-phenylhydrazone, phenyl, bromo, and amino.
7. A photoconductor in accordance with claim 1 wherein said alkyl contains from 1 to about 12 carbon atoms.
8. A photoconductor in accordance with claim 1 wherein said aryl contains from 6 to about 36 carbon atoms.
9. A photoconductor in accordance with claim 1 wherein said alkyl contains from 1 to about 6 carbon atoms, and said aryl contains from 6 to about 18 carbon atoms.
10. A photoconductor in accordance with claim 1 wherein said carbazole is at least one of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole, and said at least one charge transport is 1, 2, or 3 layers.
11. A photoconductor in accordance with claim 1 wherein said carbazole is at least one of
12. A photoconductor in accordance with claim 1 wherein said carbazole is present in an amount of from about 1 to about 20 weight percent.
13. A photoconductor in accordance with claim 1 wherein said carbazole is present in an amount of from about 3 to about 15 weight percent.
14. A photoconductor in accordance with claim 11 wherein said carbazole is N-ethylcarbazole present in an amount of 5 or 10 weight percent.
15. A photoconductor in accordance with claim 1 wherein said charge transport layer includes a component comprised of aryl amine molecules, and which aryl amines are of the formula
wherein X is selected from the group consisting of alkyl, alkoxy, aryl, and halogen, and mixtures thereof, and wherein at least one charge transport layer is from 1 to about 4.
16. A photoconductor in accordance with claim 15 wherein said alkyl and said alkoxy each contains from about 1 to about 12 carbon atoms, and said aryl contains from about 6 to about 36 carbon atoms; said carbazole is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole, and wherein at least one charge transport layer is from 1 to 3 layers, and wherein said carbazole is present in an amount of from about 1 to about 15 weight percent.
17. A photoconductor in accordance with claim 15 wherein said aryl amine is N,N\u2032-diphenyl-N,N-bis(3-methylphenyl)-1,1\u2032-biphenyl-4,4\u2032-diamine.
18. A photocondudtor in accordance with claim 1 wherein said charge transport layer contains a component comprised of
wherein X, Y, and Z are independently selected from the group consisting of alkyl, alkoxy, aryl, and halogen, and mixtures thereof.
19. A photoconductor in accordance with claim 1 wherein said charge transport layer includes a component selected from at least one of the group consisting of N,N\u2032-bis(4-butylphenyl)-N,N\u2032-di-p-tolyl-p-terphenyl-4,4\u2033-diamine, N,N\u2032-bis(4-butylphenyl)-N,N\u2032-di-m-tolyl-p-terphenyl-4,4\u2033-diamine, N,N\u2032-bis(4-butylphenyl)-N,N\u2032-di-o-tolyl-p-terphenyl-4,4\u2033-diamine, N,N\u2032-bis(4-butylphenyl)-N,N\u2032-bis-(4-isopropylphenyl)-p-terphenyl-4,4\u2033-diamine, N,N\u2032-bis(4-butylphenyl)-N,N\u2032-bis-(2-ethyl-6-methylphenyl)-p-terphenyl-4,4\u2033-diamine, N,N\u2032-bis(4-butylphenyl)-N,N\u2032-bis-(2,5-dimethylphenyl)-p-terphenyl-4,4\u2033-diamine, N,N\u2032-diphenyl-N,N-bis(3-methylphenyl)-1,1\u2032-biphenyl-4,4\u2032-diamine, and N,N\u2032-diphenyl-N,N\u2032-bis(3-chlorophenyl)-p-terphenyl-4,4\u2033-diamine; and wherein said at least one charge transport layer is from 1 to 3 layers, and said carbazole is present in an amount of from about 0.4 to about 11 weight percent.
20. A photoconductor in accordance with claim 1 further including in at least one of said charge transport layers an antioxidant comprised of a hindered phenolic, a hindered amine, and mixtures thereof, and wherein said carbazole is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole.
21. A photoconductor in accordance with claim 1 wherein said photogenerating layer is comprised of a photogenerating pigment or photogenerating pigments.
22. A photoconductor in accordance with claim 21 wherein said photogenerating pigment is comprised of at least one of a titanyl phthalocyanine, a hydroxygallium phthalocyanine, a halogallium phthalocyanine, a perylene, or mixtures thereof.
23. A photoconductor in accordance with claim 21 wherein said photogenerating pigment is comprised of a metal phthalocyanine, a metal free phthalocyanine, or mixtures thereof.
24. A photoconductor in accordance with claim 21 wherein said photogenerating pigment is comprised of titanyl phthalocyanine Type V, and wherein said carbazole is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole.
25. A photoconductor in accordance with claim 1 further including a hole blocking layer, and an adhesive layer, and wherein said carbazole is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole.
26. A photoconductor in accordance with claim 1 wherein said at least one charge transport layer is comprised of a top charge transport layer and a bottom charge transport layer, and wherein said top layer is in contact with said bottom layer and said bottom layer is in contact with said photogenerating layer, and wherein said photoconductor supporting substrate is conductive, and wherein said carbazole is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3,6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole.
27. A photoconductor comprising a supporting substrate, a photogenerating layer, and a charge transport layer, and wherein said photogenerating layer contains a carbazole of
wherein R1, R2, and R3 are hydrogen, alkyl, aryl, halogen, or mixtures thereof.
28. A photoconductor in accordance with claim 27 wherein said carbazole is present in said photogenerating layer in an amount of from about 0.4 to about 12 weight percent, and said at least one charge transport layer is 1, 2, or 3 layers.
29. A photoconductor in accordance with claim 28 wherein said photogenerating layer includes titanyl phthalocyanine Type V, and said carbazole is N-ethylcarbazole.
30. A photoconductor in accordance with claim 1 wherein said at least one charge transport layer is comprised of a top charge transport layer and a bottom charge transport layer, and wherein said top layer is in contact with said bottom layer and said bottom layer is in contact with said photogenerating layer, and wherein said photoconductor supporting substrate is conductive, and wherein said carbazole present in an amount of from about 4 to about 10 weight percent is selected from the group consisting of N-ethylcarbazole, 9-benzoylcarbazole, 9-ethylcarbazole-3-carboxaldehyde diphenylhydrazone, 9-ethylcarbazole-3-carboxaldehyde N-benzyl-N-phenylhydrazone, 9-phenylcarbazole, 3,6-dibromo-9-ethylcarbazole, 3, 6-dibromo-9-phenylcarbazole, 3-amino-N-ethylcarbazole, N-methylcarbazole, and N-vinylcarbazole.
31. A photoconductor comprising a photogenerating layer, and a charge transport layer, wherein said photogenerating layer includes at least one photogenerating pigment and a carbazole of N-ethylcarbazole, 9-benzoylcarbazole, 9-phenylcarbazole, N-methylcarbazole, or N-vinylcarbazole, and said charge transport layer includes hole transport molecules and a polymer binder.
32. A photoconductor in accordance with claim 31 wherein said at least one is one, said carbazole is present in an amount of from 3 to 11 weight percent, and said photoconductor further contains a supporting substrate in contact with said photogenerating layer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A process for recovering unreacted monomers from a gas phase polymerization process comprising:
recovering a fluid stream generated by separation of a polyolefin product from a polymerization fluid comprising unreacted monomers and optionally comonomers by purging the polymerization product with an inert gas;
contacting the fluid stream comprising the unreacted monomers, the inert gas and optionally the comonomers in an absorption zone with a scrub liquid comprising at least one C4-10 hydrocarbon, thereby absorbing at least a portion of the unreacted monomers in the scrub liquid;
withdrawing from the absorption zone: (i) a vapor overhead comprising the inert gas, and (ii) an absorber bottoms scrub liquid comprising the C4-10 hydrocarbon and the unreacted monomers; and
forming a flashed stream by flashing the absorber bottoms scrub liquid, and separating the flashed stream into a vapor containing the unreacted monomers and a liquid comprising the C4-10 hydrocarbon.
2. The process of claim 1, wherein the C4-10 hydrocarbon is selected from hexane, hexene-1, or octane.
3. The process of claim 1, wherein the vapor containing the unreacted monomers is compressed and recycled to the polymerization process.
4. The process of claim 1, wherein the liquid comprising the C4-10 hydrocarbon is cooled and pumped back to the absorption zone as the scrub liquid.
5. The process of claim 1, wherein the fluid stream comprising the unreacted monomers, the inert gas and optionally the comonomers is compressed and cooled prior to treatment in the absorption zone.