US3784376A - Photoconductive element containing furans, indoles, or thiophenes - Google Patents
Photoconductive element containing furans, indoles, or thiophenes Download PDFInfo
- Publication number
- US3784376A US3784376A US00223770A US3784376DA US3784376A US 3784376 A US3784376 A US 3784376A US 00223770 A US00223770 A US 00223770A US 3784376D A US3784376D A US 3784376DA US 3784376 A US3784376 A US 3784376A
- Authority
- US
- United States
- Prior art keywords
- element according
- photoconductive
- compound
- diphenyl
- compounds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000002240 furans Chemical class 0.000 title description 7
- 150000002475 indoles Chemical class 0.000 title description 3
- 229930192474 thiophene Natural products 0.000 title description 2
- 150000003577 thiophenes Chemical class 0.000 title 1
- 150000001875 compounds Chemical class 0.000 claims description 36
- 239000011230 binding agent Substances 0.000 claims description 20
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 229920000728 polyester Polymers 0.000 claims description 10
- 230000001235 sensitizing effect Effects 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- ZKSVYBRJSMBDMV-UHFFFAOYSA-N 1,3-diphenyl-2-benzofuran Chemical compound C1=CC=CC=C1C1=C2C=CC=CC2=C(C=2C=CC=CC=2)O1 ZKSVYBRJSMBDMV-UHFFFAOYSA-N 0.000 claims description 3
- QCWMPYWFAIRFPP-UHFFFAOYSA-N 1,2,3-triphenylisoindole Chemical compound C1=CC=CC=C1C1=C2C=CC=CC2=C(C=2C=CC=CC=2)N1C1=CC=CC=C1 QCWMPYWFAIRFPP-UHFFFAOYSA-N 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 229920000402 bisphenol A polycarbonate polymer Polymers 0.000 claims description 2
- KQXIDSYLEMUBTA-UHFFFAOYSA-N 1,3-diphenyl-4,7-dihydro-2-benzofuran Chemical compound C1C=CCC=2C1=C(C=1C=CC=CC=1)OC=2C1=CC=CC=C1 KQXIDSYLEMUBTA-UHFFFAOYSA-N 0.000 claims 2
- LBASRTOKVSTSJC-UHFFFAOYSA-N 5,6-dimethyl-1,3-diphenyl-2-benzofuran Chemical compound C=12C=C(C)C(C)=CC2=C(C=2C=CC=CC=2)OC=1C1=CC=CC=C1 LBASRTOKVSTSJC-UHFFFAOYSA-N 0.000 claims 2
- 239000011248 coating agent Substances 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 11
- LYTMVABTDYMBQK-UHFFFAOYSA-N 2-benzothiophene Chemical class C1=CC=CC2=CSC=C21 LYTMVABTDYMBQK-UHFFFAOYSA-N 0.000 abstract description 5
- VHMICKWLTGFITH-UHFFFAOYSA-N 2H-isoindole Chemical compound C1=CC=CC2=CNC=C21 VHMICKWLTGFITH-UHFFFAOYSA-N 0.000 abstract description 5
- -1 alkylene radical Chemical group 0.000 description 24
- 238000000034 method Methods 0.000 description 15
- 239000000203 mixture Substances 0.000 description 11
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 125000003118 aryl group Chemical group 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 8
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 125000004432 carbon atom Chemical group C* 0.000 description 6
- UXGVMFHEKMGWMA-UHFFFAOYSA-N 2-benzofuran Chemical class C1=CC=CC2=COC=C21 UXGVMFHEKMGWMA-UHFFFAOYSA-N 0.000 description 5
- 239000008199 coating composition Substances 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 5
- 239000004417 polycarbonate Substances 0.000 description 5
- 150000003254 radicals Chemical class 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000000123 paper Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 125000001424 substituent group Chemical group 0.000 description 4
- OBTZDIRUQWFRFZ-UHFFFAOYSA-N 2-(5-methylfuran-2-yl)-n-(4-methylphenyl)quinoline-4-carboxamide Chemical compound O1C(C)=CC=C1C1=CC(C(=O)NC=2C=CC(C)=CC=2)=C(C=CC=C2)C2=N1 OBTZDIRUQWFRFZ-UHFFFAOYSA-N 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 150000002518 isoindoles Chemical class 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- XRDYDVNVKZSXRE-UHFFFAOYSA-N 1,3,4,7-tetraphenyl-2-benzofuran Chemical compound C1=CC=CC=C1C1=C2C(C=3C=CC=CC=3)=CC=C(C=3C=CC=CC=3)C2=C(C=2C=CC=CC=2)O1 XRDYDVNVKZSXRE-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229920004142 LEXAN™ Polymers 0.000 description 2
- 239000004418 Lexan Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 229920000180 alkyd Polymers 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 125000005678 ethenylene group Chemical group [H]C([*:1])=C([H])[*:2] 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000000623 heterocyclic group Chemical group 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 125000001624 naphthyl group Chemical group 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- QLUXVUVEVXYICG-UHFFFAOYSA-N 1,1-dichloroethene;prop-2-enenitrile Chemical compound C=CC#N.ClC(Cl)=C QLUXVUVEVXYICG-UHFFFAOYSA-N 0.000 description 1
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- CWVMFPUEADIKAP-UHFFFAOYSA-N 1,3,4-triphenyl-2H-isoindole Chemical compound C1(=CC=CC=C1)C=1C2=C(NC(=C2C=CC1)C1=CC=CC=C1)C1=CC=CC=C1 CWVMFPUEADIKAP-UHFFFAOYSA-N 0.000 description 1
- YCFOLQSTUQNCAS-UHFFFAOYSA-N 1-phenyl-2h-isoindole Chemical compound C=12C=CC=CC2=CNC=1C1=CC=CC=C1 YCFOLQSTUQNCAS-UHFFFAOYSA-N 0.000 description 1
- VHQGURIJMFPBKS-UHFFFAOYSA-N 2,4,7-trinitrofluoren-9-one Chemical compound [O-][N+](=O)C1=CC([N+]([O-])=O)=C2C3=CC=C([N+](=O)[O-])C=C3C(=O)C2=C1 VHQGURIJMFPBKS-UHFFFAOYSA-N 0.000 description 1
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 1
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- FCSKOFQQCWLGMV-UHFFFAOYSA-N 5-{5-[2-chloro-4-(4,5-dihydro-1,3-oxazol-2-yl)phenoxy]pentyl}-3-methylisoxazole Chemical compound O1N=C(C)C=C1CCCCCOC1=CC=C(C=2OCCN=2)C=C1Cl FCSKOFQQCWLGMV-UHFFFAOYSA-N 0.000 description 1
- 208000033116 Asbestos intoxication Diseases 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000004709 Chlorinated polyethylene Substances 0.000 description 1
- 229920001634 Copolyester Polymers 0.000 description 1
- 229920006385 Geon Polymers 0.000 description 1
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 1
- YGYAWVDWMABLBF-UHFFFAOYSA-N Phosgene Chemical compound ClC(Cl)=O YGYAWVDWMABLBF-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 241000282485 Vulpes vulpes Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- MUBKMWFYVHYZAI-UHFFFAOYSA-N [Al].[Cu].[Zn] Chemical compound [Al].[Cu].[Zn] MUBKMWFYVHYZAI-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000012644 addition polymerization Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000008425 anthrones Chemical class 0.000 description 1
- 206010003441 asbestosis Diseases 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- JKOSHCYVZPCHSJ-UHFFFAOYSA-N benzene;toluene Chemical compound C1=CC=CC=C1.C1=CC=CC=C1.CC1=CC=CC=C1 JKOSHCYVZPCHSJ-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 150000008366 benzophenones Chemical class 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 description 1
- 238000002508 contact lithography Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002220 fluorenes Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- YCWSUKQGVSGXJO-NTUHNPAUSA-N nifuroxazide Chemical group C1=CC(O)=CC=C1C(=O)N\N=C\C1=CC=C([N+]([O-])=O)O1 YCWSUKQGVSGXJO-NTUHNPAUSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011101 paper laminate Substances 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001490 poly(butyl methacrylate) polymer Polymers 0.000 description 1
- 229920000205 poly(isobutyl methacrylate) Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- WVIICGIFSIBFOG-UHFFFAOYSA-N pyrylium Chemical compound C1=CC=[O+]C=C1 WVIICGIFSIBFOG-UHFFFAOYSA-N 0.000 description 1
- 150000004053 quinones Chemical class 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 229940043267 rhodamine b Drugs 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical class OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0622—Heterocyclic compounds
- G03G5/0624—Heterocyclic compounds containing one hetero ring
- G03G5/0627—Heterocyclic compounds containing one hetero ring being five-membered
- G03G5/0629—Heterocyclic compounds containing one hetero ring being five-membered containing one hetero atom
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0664—Dyes
- G03G5/0666—Dyes containing a methine or polymethine group
- G03G5/0668—Dyes containing a methine or polymethine group containing only one methine or polymethine group
- G03G5/067—Dyes containing a methine or polymethine group containing only one methine or polymethine group containing hetero rings
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
- G03G5/02—Charge-receiving layers
- G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
- G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
- G03G5/0664—Dyes
- G03G5/0666—Dyes containing a methine or polymethine group
- G03G5/0672—Dyes containing a methine or polymethine group containing two or more methine or polymethine groups
- G03G5/0674—Dyes containing a methine or polymethine group containing two or more methine or polymethine groups containing hetero rings
Definitions
- Organic photoconductive elements of improved electrophotographic speed are prepared by coating on an electrically conducting support a photoconductive layer containing a l,3-diarylisobenzofuran or 1,3- diaryl-4,7-dihydroisobenzofuran or the corresponding isoindole or isobenzothiophene derivatives.
- This invention relates to electrophotography and more particularly to novel organic photoconductive materials.
- Electrophotographic processes employ an electrophotographic or photoconductive element comprising a coating of a photoconductive insulating material on a conductive support.
- the element is given a uniform surface charge in the dark and then is exposed to an image pattern of activating electromagnetic radiation such as light or X-rays.
- the charge on the photoconductive element is dissipated in the illuminated area to form an electrostatic charge pattern which is then de veloped by contact with an electroscopic marking material.
- the marking material or toner as it is also called, whether carried in an insulating liquid or in the form of a dry powder, deposits on the exposed surface in accordance with either the charge pattern or the discharge pattern, as desired.
- the photoconductive element is of the non-reusable type
- the developed image is fixed by fusion or otherwise to the surface of the photoconductive element.
- the element is of the reusable type, e.g., a selenium-coated drum
- the image is transferred to another surface such as paper and then fixed to provide a copy of the original.
- organic materials can be used as photoconductors.
- the organic photoconductors have a number of advantages over the inorganic photoconductors such as zinc oxide, which are presently more widely used.
- the organics are more resistant to abrasion than the inorganics. They can be charged to either high negative or positive potential while the inorganics often saturate at low potential and are less versatile in that characteristically they accept only a positive or a negative charge.
- the organics usually offer greater exposure latitude, can be spectrally sensitized more effectively and have other advantages over zinc oxide and other inorganics.
- organic photoconductors possess in greater or lesser degree have lead to a widespread interest in them.
- many organic photoconductors have low xerographic speed or sensitivity and those that have adequate speed often have poor light stability and form colored materials by photodegradation.
- aryl is thus used with respect to the 1,3- substituents to include not only phenyl, naphthyl and the like but also styryl, riaphthylvinylene and the like.
- X is -O-, -S- or -NR;
- R is H or alkyl of 1 to 18 carbon atoms, preferably lower alkyl;
- Ar and Ar are aryl groups;
- R,, R R and R are hydrogen atoms or substituents, and
- n and m are integers from 0 to 4.
- R R R and R can be essentially any electropositive or electronegative radicals such as alkyl, aryl, -COOR, -CONR -CN, halogen, -OR, -R'- COOR or -R-CONR, wherein R is hydrogen or alkyl of l to 18 carbon atoms and preferably is lower alkyl and R is an alkylene radical of l to 18 carbon atoms, preferably lower alkyl (i.e., l to about 6 carbon atoms).
- the aryl groups, Ar and Ar include, for example, phenyl, naphthyl, etc, and such radicals having substituents on the aromatic rings.
- the photoconductive elements of the invention can employ any of the described isobenzofuran and analogous compounds having the indicated broad range of substituents.
- compounds are employed in which R R R and R and the values of n and m are such that the compounds are soluble in convenient solvents and are compatible with the most effective binder resins. Best results in these respects are obtained when n and m are ml and R,, R R and R, are hydrogen atoms or alkyl groups of l to 18 carbon atoms, especially lower alkyl groups (i.e., 1 to about 6 carbon atoms).
- Examples of the compounds of particular interest include the following: l,3-diphenylisobenzofuran; l,3- diphenyl-S,6-dimethylisobenzofuran; l,3-diphenyl-4,7- dihydroisobenzofuran; l-mesityl-3- phenylisobenzofuran; l,3-dimesitylisobenzofuran; 1,3- diphenyl-4,7-diethylisobenzofuran; 1,3-diphenyl-5,6- dimethyl-isobenzothiophene; l ,3-diphenyl-4,7- dimethylisoindole; l,3-bis(m-bromostyryl)isobenzothiophene; l,3-bis(p-dimethylaminostyryl)isobenzofuran; l-(2-naphthyl)-3-styryl-5,6- dimethylisobenz
- these compounds When employed as photoconductors in accordance with the present invention these compounds are mixed in an amount of l to 75 parts by weight with 25 to 99 parts by weight of a polymeric binder and are coated from a suitable solvent on a conducting support to provide the photoconductive layer of the electrophotographic element.
- Preferred binders for admixture with the photoconductive compounds in preparing the photoconductive layers of the present invention include polymers having fairly high dielectric strength which are good electrically insulating film-forming vehicles.
- Materials of this type include styrene-butadiene copolymers; silicone resins; styrene-alkyd resins; silicone-alkyd resins; soyaalkyd resins; poly(vinyl chloride); poly(vinylidene chloride); vinyl chloride-vinylidene chloride copolymers; vinylidene chloride-acrylonitrile' copolymers; poly(vinyl acetate); vinyl acetate-vinyl chloride copolymers; poly(vinyl acetals), such as poly(vinyl butyral); polyacrylic and methacrylic esters, such as poly(- methyl methacrylate), poly(n-butyl methacrylate), poly(isobutyl methacrylate), etc.; polyst
- thermoplastic resins Especially preferred are thermoplastic resins. Suitable resins are sold under such trademarks as Vitel PE-lOl, Cymac, Piccopale 100, Saran F-220, Lexan 145 and Geon 222. Also mixtures of these binders can be used.
- the photoconductive compositions formed by blending a polymeric binder such as a polyester or polycarbonate with a monomeric organic photoconductor of the type described are preferred embodiments of the invention, because they provide a wide choice of binders and ratios of binder to photoconductor. It is well known, however, to use polymerizable photoconductors that require no separate polymeric binder. It should be understood therefore that it is within the scope of the present invention to use species of the described photoconductors that contain the active nuclei depicted above but that are polymerizable and require no separate polymeric binder, although even in this event a polymer of the polymeric binder type can also be blended with the polymeric photoconductor if desired.
- the polymeric photoconductors are prepared by polymerizing monomers which contain the described photoconductive nuclei (i.e., 1,3-diarylisobenzofuran or l,3-diaryl-4,7-dihydroisobenzofuran or corresponding isobenzothiophene or isoindole) and which are polymerizable to form either addition or condensation polymers.
- Addition polymers can be formed when the monomeric photoconductor contains one or more vinylene groups as, for example, when n or m or both in l or II above is a positive integer of l to 4.
- the addition polymerization can be carried out by known catalytic techniques for polymerization of vinyl monomers.
- Condensation polymers can be formed when, for example, in formulae l and ll, two or more of the substituents R, through R, are radicals that condense with other radicals to form esters, amides, urethanes, carbonates, etc. These include radicals such as -Ol-l, -COOl-l. -COOalkyl, -Nl-l and the like. Conventional catalytic procedures for forming such condensation polymers can be used. For example, if R, and R are carboxyl groups the isobenzofuran compound can be reacted with a glycol such as ethylene glycol in the presence of a catalyst such as an oxide of tin or titanium to form a polyester.
- a catalyst such as an oxide of tin or titanium
- the preferred condensation polymers are polycarbonates and polyurethanes and especially preferred are those formed from monomers l or II when R, and R are the polymer-forming functional groups such as hydroxyl groups, n and m are zero, and the monomer is reacted with phosgene or a diisocyanate.
- Solvents useful for preparing coating compositions with the photoconductors of the present invention can include a wide variety of organic solvents for the components of the coating composition.
- organic solvents for the components of the coating composition.
- benzene; toluene; acetone; 2-butanone; chlorinated hydrocarbons such as methylene chloride; ethylene chloride; and the like; others, such as tetrahydrofuran and the like, or mixtures of such solvents can advantageously be employed in the practice of this invention.
- sensitizing compounds usful with the photoconductive elements of the present invention can be selected from a wide variety of materials, including such materials as pyrylium dye salts including thiapyrylium dye salts and selenapyrylium dye salts disclosed in VanAllen et al. U. S. Pat. No.
- fluorenes such as 7,12-dioxo-l 3-dibenzo(a,h)fluorene, 5,10-dioxo- 4a,l l-'diazabenzo(b)fluorene, 3,1 3-dioxo-7- oxadibenzo-(b,g)tluorene, and the like; aggregate-type sensitizers of the type described in Belgian Pat. No. 705,117 dated Apr. 16, 1968; aromatic nitro com pounds of the kind described in U. S. Pat. No.
- sensitizer that can be added to a photoconductor layer to give effective increases in speed can vary widely.
- concentration will vary with the specific photoconductor and sensitizing compound used.
- substantial speed gains can be obtained where an appropriatesensitizer is added in a concentration range from about 0.0001 to about weight percent or more based on the weight of the coating composition.
- sensitizers are added to the coating composition in an amount of about 0.005 to about 5.0 percent by weight of the total coating composition.
- Coating thicknesses of the photoconductive composition on a support can vary widely. Normally, a coating in the range of about In to about 500p. after drying is useful for the practice of this invention. The preferred range of coating thickness is found to be in the range from about Sp. to about 200p. after drying although useful results can be obtained outside of this range.
- Suitable supporting materials for the photoconductive layers of the present invention can include any of a wide variety of electrically conducting supports, for example, various conducting papers; aluminum coated paper; aluminum-paper laminates; metal foils such as aluminum foil, zinc foil, etc.; metal plates, such as aluminum, copper, zinc, brass, and galvanized plates; varpor deposited metal layers such as'silver, nickel or aluminum on conventional film supports such as cellulose acetate, poly-(ethylene terephthalate), polystyrene and the like conducting supports.
- An especially useful conducting support can be prepared by coating a support material such as poly(ethylene terephthalate with a layer containing a semiconductor dispersed in a resin as described in U. S. Pat. No.
- a suitable conducting coating can be prepared from the sodium salt of a carboxyester lactone of a malaic anhydride-vinyl acetate copolymer. .Such kinds of conducting layers and methods for their optimum preparation and use are disclosed in U. S. Pat. Nos. 3,007,901; 3,245,833 and 3,267,807.
- the electrophotographic elements of the invention are used for making xerographic images in the follow- -ingmanner:.
- the electrophotographic element is held in the dark and given a blanket electrostatic charge by placing it under a corona discharge. This uniform charge is retained by the photoconductive layer because the substantial dark insulating property of the layer, i.e., the low conductivity of the layer in the dark.
- the electrostatic charge formedon the surface of the photoconductive layer is then selectively dissipated from the surface of the layer by image-wise exposure to light by means of a conventional exposure operation such as, for example, by a contact-printing technique, or by lens projection of an image, and the like, to thereby form a latent electrostatic image in the photoconductive layer. Exposing the surface in this manner forms a pattern of electrostatic charge by virtue of the 6 fact that light energy striking the photoconductor causes the electrostatic charge in the light struck areas to be conducted away from the surface in proportion to the intensity of the illumination in a particular area.
- the charge pattern produced by exposure is then developed or transferred to another surface and developed there, i.e., either the charged or uncharged areas rendered visible, by treatment with a medium comprising electrostatically responsive particles having optical density.
- the developing electrostatically responsive particles can be in the form of adjustt, i.e., powder, or a pigment in a resinous carrier, i.e., toner.
- a preferred method of applying such toner to a latent electrostaic image for solid area development is by the use of a magnetic brush. Methods for forming and using a magnetic brush toner applicator are described in the following U. S. Pat.
- Liquid development of the latent electrostatic image may also be used.
- the developing particles are carried to the image-bearing surface in an electrically insulating liquid carrier.
- Methods of development of this type are widely known and have been described in the patent literature, for example, U. S. Pat. No. 2,907,674 and in Australian Pat. No. 212,315.
- dry developing processes the most widely used method of obtaining a permanent record is achieved by selecting a developing particle which has as one of its components a low-melting resin.
- Heating the powder image then causes the resin to melt or fuse into or on the element.
- the powder is, therefore, caused to adhere permanently to the surface of the photoconductive layer.
- a transfer of the electrostatic charge image formed on the photoconductive layer can be made to a second support such as paper which would then become the final print after development and fusing.
- Electrophotographic elements or plates are prepared in the following manner: To a solution of 0.15 grams of the organic photoconductive compound and 0.002 grams of a sensitizing dye in 5 ml. of methylene chloride is added 0.050 grams of Vitel PE-l0l* *Vitel PE- 101 is a trademark of Goodyear Tire & Rubber Company for a copolyester of terephthalic acid with a glycol mixture having a 9:1 molar ratio of ethylene glycol and 2,2-bis-(4-B-hydroxyethoxyphenyl) propane. polyester. The mixture is agitated to obtain a clear viscous solution or dope which is knife-coated on aluminum foil at about F. and a wet thickness of 0.004 inches.
- the coated product is dried and dark-conditioned by heating for fifteen hours in a dark oven at 47 C.
- Samples of the resulting xerographic element are charged in total darkness by means of a negative corona and then exposed through a step tablet to the light of a tungsten lamp at an illumination intensity of about 19 foot-candles for 12 seconds.
- the step tablet is of the carbon-grain-in-gelatin type with density increments of 0.15.
- An inlay of 2.0 density covers one half of the tablet to extend the range of exposure.
- a photographic film positive carrying printed text and numbers identifying the steps lies between the photoconduetive layer and the tablet.
- the resulting electrostatic latent image is developed by cascading over the surface of the photoconduetive layer a mixture of negatively charged thermoplastic toner particles and plastic beads.
- EXAMPLE 2 The crystallization of the 1,3,4,7-tetraphenylisobenzo-furan encountered in Example 1 is eliminated or reduced in a photoconduetive element prepared substantially as in Example 1 but using bisphenol-A polycarbonate (Lexan polycarbonate) as the binder instead of polyester and using approximately 15 percent concentration of the compound in the coating instead of approximately 20 percent. Testing of such compositions containing compound IV and either sensitizer B 9 or sensitizer F for positive and negative charging gives the following results:
- Photoconductive elements of the invention containing a thiobenzofuran (compound VI) or an isoindole (compound VII) are prepared as in Example 1, using the following basic formulation:
- Compounds of somewhat related structure which appear to have some utility as organic photoconductors, although not having the surprisingly high sensitivity of the l,3-diarylisobenzofurans, include the following isoindoles: l-(4-dimethyl-amin0phenylisoindole, 1 phenylisoindole and l-(4-methoxyphenyl) isoindole.
- a photoconductive element comprising an electrically conducting support and having thereon a layer comprising a polymeric binder with an organic photoconductive compound of the formula where R R R and R are hydrogen, alkyl, aryl,
- R is hydrogen or alkyl and R is an alkylene radical
- Ar and Ar are aryl groups
- X is O, S, or NR
- n and m are integers from 0 to 4.
- R R R and R are hydrogen or lower alkyl.
- organic photoconductor compound is l,3-diphenyl-5,6- dimethylisobenzofuran.
- An element according to claim 1 comprising a photoconductive layer coated on an electrically conducting support, said layer comprising (a) a photoconductive compound selected from the group consisting of l,3-diphenylisobenzo-furan, l,3-diphenyl-5,6- dimethylisobenzofuran and l,3diphenyl-4,7- dihydroisobenzofuran, (b) a sensitizing dye and (c) a polymeric binder.
- polymeric binder is a major component of the photoconductive layer and is a bisphenoLA. polycarbonate.
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Abstract
Organic photoconductive elements of improved electrophotographic speed are prepared by coating on an electrically conducting support a photoconductive layer containing a 1,3diarylisobenzofuran or 1,3-diaryl-4,7-dihydroisobenzofuran or the corresponding isoindole or isobenzothiophene derivatives.
Description
United States Patent [191 11] 3,784,376 F0X Jan. 8, 1974 PHOTOCONDUCTIVE ELEMENT 3,174,854 3/1965 Stump t 252 501 CONTAINING FURANS, INDOLES, OR THIOPHENES Charles J. Fox, Rochester, N.Y.
Eastman Kodak Company, Rochester, NY.
Filed: Feb. 4, 1972 Appl. No.: 223,770
Related US. Application Data Inventor:
Assignee:
US. Cl. 96/15, 252/501 Int. Cl G03g 5/00 Field of Search 96/15, 252/501 References Cited UNITED STATES PATENTS 12/1969 Fox 96/].5
OTHER PUBLICATIONS C.A., v01. 57, p. 1743 1.
Primary ExaminerNorman G. T'orchin Assistant Examiner-John L. Goo drow Attorney-Robert W. Hampton et a].
Organic photoconductive elements of improved electrophotographic speed are prepared by coating on an electrically conducting support a photoconductive layer containing a l,3-diarylisobenzofuran or 1,3- diaryl-4,7-dihydroisobenzofuran or the corresponding isoindole or isobenzothiophene derivatives.
ABSTRACT 10 Claims, No Drawings PHOTOCONDUCTIVE ELEMENT CONTAINING FURANS, INDOLES, OR TI-IIOPI-IENES This invention relates to electrophotography and more particularly to novel organic photoconductive materials.
Electrophotographic processes employ an electrophotographic or photoconductive element comprising a coating of a photoconductive insulating material on a conductive support. The element is given a uniform surface charge in the dark and then is exposed to an image pattern of activating electromagnetic radiation such as light or X-rays. The charge on the photoconductive element is dissipated in the illuminated area to form an electrostatic charge pattern which is then de veloped by contact with an electroscopic marking material. The marking material or toner, as it is also called, whether carried in an insulating liquid or in the form of a dry powder, deposits on the exposed surface in accordance with either the charge pattern or the discharge pattern, as desired. Then, if the photoconductive element is of the non-reusable type, the developed image is fixed by fusion or otherwise to the surface of the photoconductive element. If the element is of the reusable type, e.g., a selenium-coated drum, the image is transferred to another surface such as paper and then fixed to provide a copy of the original.
All of this is well known and has been described in many patents and other literature, for example, in the patent of Carlson, U. S. Pat. No. 2,297,691, and in more recent works such as Electrophotography by R. M. Scaffert, published by Focal Press Ltd., 1965.
It is also known that many organic materials can be used as photoconductors. The organic photoconductors have a number of advantages over the inorganic photoconductors such as zinc oxide, which are presently more widely used. For instance, the organics are more resistant to abrasion than the inorganics. They can be charged to either high negative or positive potential while the inorganics often saturate at low potential and are less versatile in that characteristically they accept only a positive or a negative charge. Also the organics usually offer greater exposure latitude, can be spectrally sensitized more effectively and have other advantages over zinc oxide and other inorganics.
These useful properties which organic photoconductors possess in greater or lesser degree have lead to a widespread interest in them. However, they also have certain disadvantages which render them less desirable than zinc oxide for some uses. For example, many organic photoconductors have low xerographic speed or sensitivity and those that have adequate speed often have poor light stability and form colored materials by photodegradation.
Among the many organic photoconductors that have been proposed are various 2,5-diarylfurans and 2,3- benzofurans, as disclosed, for example, in German Pat. No. 1,105,714 and Belgian Pat. No. 585,450. Although these furan derivaties have a number of advantages as organic photoconductors a problem has been that their sensitivity or electrophotographic speed has not been as high as desired.
In accordance with the present invention I have discovered that certain isobenzofurans and related compounds have unexpectedly higher electrophotographic speed than the furan derivaties which are reported in the prior art as photoconductors and also have better diarylisobenzofura'n the 1 and 3 positions. The aryl groups can be separated from the heterocyclic nucleus by conjugated linear car- CH CH where n=0 to 4. Therefore, in referring broadly to the 1,3-diaryl substituted compounds herein, it is intended to include vinylogs in which one or both of the 1,3-aryl groupsis separated from the heterocyclic nucleus by one or more vinylene groups. The term aryl is thus used with respect to the 1,3- substituents to include not only phenyl, naphthyl and the like but also styryl, riaphthylvinylene and the like.
Such compounds can be represented by the formulae:
and
wherein X is -O-, -S- or -NR; R is H or alkyl of 1 to 18 carbon atoms, preferably lower alkyl; Ar and Ar, are aryl groups; R,, R R and R, are hydrogen atoms or substituents, and n and m are integers from 0 to 4. As substituens, R R R and R, can be essentially any electropositive or electronegative radicals such as alkyl, aryl, -COOR, -CONR -CN, halogen, -OR, -R'- COOR or -R-CONR,, wherein R is hydrogen or alkyl of l to 18 carbon atoms and preferably is lower alkyl and R is an alkylene radical of l to 18 carbon atoms, preferably lower alkyl (i.e., l to about 6 carbon atoms). The aryl groups, Ar and Ar include, for example, phenyl, naphthyl, etc, and such radicals having substituents on the aromatic rings.
The photoconductive elements of the invention can employ any of the described isobenzofuran and analogous compounds having the indicated broad range of substituents. Advantageously, however, compounds are employed in which R R R and R and the values of n and m are such that the compounds are soluble in convenient solvents and are compatible with the most effective binder resins. Best results in these respects are obtained when n and m are ml and R,, R R and R, are hydrogen atoms or alkyl groups of l to 18 carbon atoms, especially lower alkyl groups (i.e., 1 to about 6 carbon atoms).
Examples of the compounds of particular interest include the following: l,3-diphenylisobenzofuran; l,3- diphenyl-S,6-dimethylisobenzofuran; l,3-diphenyl-4,7- dihydroisobenzofuran; l-mesityl-3- phenylisobenzofuran; l,3-dimesitylisobenzofuran; 1,3- diphenyl-4,7-diethylisobenzofuran; 1,3-diphenyl-5,6- dimethyl-isobenzothiophene; l ,3-diphenyl-4,7- dimethylisoindole; l,3-bis(m-bromostyryl)isobenzothiophene; l,3-bis(p-dimethylaminostyryl)isobenzofuran; l-(2-naphthyl)-3-styryl-5,6- dimethylisobenzofuran; l,3-di(m-tolyl )-4- dimethylamino-7ethylisobenzothiophene; 1,3-bis-(4- phenyl-l ,3-butadienyl-l )-2-methylisoindole; 1,3-bis- (Z-naphthylvinylene-l )isobenzofuran; 1,3-diphenyl-- methylisoindole; l,3-diphenyl-2-methylisoindole; 1,3- diphenyl-S ,6-dimethyl-4,7-dihydroisobenzothiophene and l,3-diphenyl-2-methyl-4,7-dihydroisoindole.
lsobenzofurans and dihydroisobenzofurans of the types suitable in the compositions of the invention and methods of preparing such compounds are described, for example, by M. S. Newman, J. Org. Chem., 26, 2630 (1960) and by Adams et al., J. Am. Chem. Soc., 62, 56 (1940). The isobenzothiophene and isoindole compounds, i.e., where X in the formulae above is -S- or -NH-, can be prepared, for example, by the procedure of Mann et al., Chem. Commun. 1969, 420.
When employed as photoconductors in accordance with the present invention these compounds are mixed in an amount of l to 75 parts by weight with 25 to 99 parts by weight of a polymeric binder and are coated from a suitable solvent on a conducting support to provide the photoconductive layer of the electrophotographic element.
Preferred binders for admixture with the photoconductive compounds in preparing the photoconductive layers of the present invention include polymers having fairly high dielectric strength which are good electrically insulating film-forming vehicles. Materials of this type include styrene-butadiene copolymers; silicone resins; styrene-alkyd resins; silicone-alkyd resins; soyaalkyd resins; poly(vinyl chloride); poly(vinylidene chloride); vinyl chloride-vinylidene chloride copolymers; vinylidene chloride-acrylonitrile' copolymers; poly(vinyl acetate); vinyl acetate-vinyl chloride copolymers; poly(vinyl acetals), such as poly(vinyl butyral); polyacrylic and methacrylic esters, such as poly(- methyl methacrylate), poly(n-butyl methacrylate), poly(isobutyl methacrylate), etc.; polystyrene; nitrated polystyrene; polymethylstyrene; isobutylene polymers; polyesters, such as copoly[ethylene-coalkylenebis(alkyleneoxyaryl)phenylenedicarboxylate], e.g., poly[ethylene-co-isopropylidene- 2,2'bis-(ethyleneoxyphenyl)terephthalate]; phenolformaldehyde resins; ketone resins; polyamides; polycarbonates; polythiocarbonates; copolymers of vinyl haloarylates and vinyl acetate such as poly(vinyl-mbromobenzoate-co vinyl acetate); waxes, chlorinated polyethylene, etc. Especially preferred are thermoplastic resins. Suitable resins are sold under such trademarks as Vitel PE-lOl, Cymac, Piccopale 100, Saran F-220, Lexan 145 and Geon 222. Also mixtures of these binders can be used.
The photoconductive compositions formed by blending a polymeric binder such as a polyester or polycarbonate with a monomeric organic photoconductor of the type described are preferred embodiments of the invention, because they provide a wide choice of binders and ratios of binder to photoconductor. It is well known, however, to use polymerizable photoconductors that require no separate polymeric binder. It should be understood therefore that it is within the scope of the present invention to use species of the described photoconductors that contain the active nuclei depicted above but that are polymerizable and require no separate polymeric binder, although even in this event a polymer of the polymeric binder type can also be blended with the polymeric photoconductor if desired.
The polymeric photoconductors are prepared by polymerizing monomers which contain the described photoconductive nuclei (i.e., 1,3-diarylisobenzofuran or l,3-diaryl-4,7-dihydroisobenzofuran or corresponding isobenzothiophene or isoindole) and which are polymerizable to form either addition or condensation polymers. Addition polymers can be formed when the monomeric photoconductor contains one or more vinylene groups as, for example, when n or m or both in l or II above is a positive integer of l to 4. The addition polymerization can be carried out by known catalytic techniques for polymerization of vinyl monomers.
Condensation polymers can be formed when, for example, in formulae l and ll, two or more of the substituents R, through R, are radicals that condense with other radicals to form esters, amides, urethanes, carbonates, etc. These include radicals such as -Ol-l, -COOl-l. -COOalkyl, -Nl-l and the like. Conventional catalytic procedures for forming such condensation polymers can be used. For example, if R, and R are carboxyl groups the isobenzofuran compound can be reacted with a glycol such as ethylene glycol in the presence of a catalyst such as an oxide of tin or titanium to form a polyester. The preferred condensation polymers are polycarbonates and polyurethanes and especially preferred are those formed from monomers l or II when R, and R are the polymer-forming functional groups such as hydroxyl groups, n and m are zero, and the monomer is reacted with phosgene or a diisocyanate.
Solvents useful for preparing coating compositions with the photoconductors of the present invention can include a wide variety of organic solvents for the components of the coating composition. For example, benzene; toluene; acetone; 2-butanone; chlorinated hydrocarbons such as methylene chloride; ethylene chloride; and the like; others, such as tetrahydrofuran and the like, or mixtures of such solvents can advantageously be employed in the practice of this invention.
sensitizing compounds usful with the photoconductive elements of the present invention can be selected from a wide variety of materials, including such materials as pyrylium dye salts including thiapyrylium dye salts and selenapyrylium dye salts disclosed in VanAllen et al. U. S. Pat. No. 3,250,615; fluorenes, such as 7,12-dioxo-l 3-dibenzo(a,h)fluorene, 5,10-dioxo- 4a,l l-'diazabenzo(b)fluorene, 3,1 3-dioxo-7- oxadibenzo-(b,g)tluorene, and the like; aggregate-type sensitizers of the type described in Belgian Pat. No. 705,117 dated Apr. 16, 1968; aromatic nitro com pounds of the kind described in U. S. Pat. No.
2,610,120; anthrones like those disclosed in U. S. Pat. 2,670,284; quinones, U. S. Pat. No. 2,670,286; benzophenones U. S. Pat. No. 2,670,287; thiazoles U. S. Pat. No. 2,732,301; mineral acids; carboxylic acids, such as maleic acid, diand tri-chloroacetic acids, and salicyclic acid; sulfonic and phosphoric acids; and other electron acceptor compounds as disclosed by l-l. l-Ioegl, J. Phys. Chem., 69, No. 3, 755-766 (March, 1965), an
U. S. Pat. No. 3,232,755.
The amount of sensitizer that can be added to a photoconductor layer to give effective increases in speed can vary widely. The optimum concentration will vary with the specific photoconductor and sensitizing compound used. In general, substantial speed gains can be obtained where an appropriatesensitizer is added in a concentration range from about 0.0001 to about weight percent or more based on the weight of the coating composition. Normally, sensitizers are added to the coating composition in an amount of about 0.005 to about 5.0 percent by weight of the total coating composition.
Coating thicknesses of the photoconductive composition on a support can vary widely. Normally, a coating in the range of about In to about 500p. after drying is useful for the practice of this invention. The preferred range of coating thickness is found to be in the range from about Sp. to about 200p. after drying although useful results can be obtained outside of this range.
Suitable supporting materials for the photoconductive layers of the present invention can include any of a wide variety of electrically conducting supports, for example, various conducting papers; aluminum coated paper; aluminum-paper laminates; metal foils such as aluminum foil, zinc foil, etc.; metal plates, such as aluminum, copper, zinc, brass, and galvanized plates; varpor deposited metal layers such as'silver, nickel or aluminum on conventional film supports such as cellulose acetate, poly-(ethylene terephthalate), polystyrene and the like conducting supports. An especially useful conducting support can be prepared by coating a support material such as poly(ethylene terephthalate with a layer containing a semiconductor dispersed in a resin as described in U. S. Pat. No. 3,245,833 or vacuum de posited on the support. Likewise, a suitable conducting coating can be prepared from the sodium salt of a carboxyester lactone of a malaic anhydride-vinyl acetate copolymer. .Such kinds of conducting layers and methods for their optimum preparation and use are disclosed in U. S. Pat. Nos. 3,007,901; 3,245,833 and 3,267,807.
The electrophotographic elements of the invention are used for making xerographic images in the follow- -ingmanner:.The electrophotographic element is held in the dark and given a blanket electrostatic charge by placing it under a corona discharge. This uniform charge is retained by the photoconductive layer because the substantial dark insulating property of the layer, i.e., the low conductivity of the layer in the dark. The electrostatic charge formedon the surface of the photoconductive layer is then selectively dissipated from the surface of the layer by image-wise exposure to light by means of a conventional exposure operation such as, for example, by a contact-printing technique, or by lens projection of an image, and the like, to thereby form a latent electrostatic image in the photoconductive layer. Exposing the surface in this manner forms a pattern of electrostatic charge by virtue of the 6 fact that light energy striking the photoconductor causes the electrostatic charge in the light struck areas to be conducted away from the surface in proportion to the intensity of the illumination in a particular area.
The charge pattern produced by exposure is then developed or transferred to another surface and developed there, i.e., either the charged or uncharged areas rendered visible, by treatment with a medium comprising electrostatically responsive particles having optical density. The developing electrostatically responsive particles can be in the form of adust, i.e., powder, or a pigment in a resinous carrier, i.e., toner. A preferred method of applying such toner to a latent electrostaic image for solid area development is by the use of a magnetic brush. Methods for forming and using a magnetic brush toner applicator are described in the following U. S. Pat. Nos: 2,786,439; 2,786,440; 2,786,441; 2,811,465; 2,874,063; 2,984,163; 3,040,704; 3,117,884; and Reissue 25,779. Liquid development of the latent electrostatic image may also be used. In liquid development, the developing particles are carried to the image-bearing surface in an electrically insulating liquid carrier. Methods of development of this type are widely known and have been described in the patent literature, for example, U. S. Pat. No. 2,907,674 and in Australian Pat. No. 212,315. In dry developing processes, the most widely used method of obtaining a permanent record is achieved by selecting a developing particle which has as one of its components a low-melting resin. Heating the powder image then causes the resin to melt or fuse into or on the element. The powder is, therefore, caused to adhere permanently to the surface of the photoconductive layer. In other cases, a transfer of the electrostatic charge image formed on the photoconductive layer can be made to a second support such as paper which would then become the final print after development and fusing. Techniques of the type indicated are well known in the art and have been described in a number of U. S. and foreign patents, such as U. S. Pat. Nos. 2,297,691 and 2,551,582 and in RCA Review Vol. 15 (1954) pages 469-484.
The following example further illustrates the principles of the invention.
EXAMPLE 1 Electrophotographic elements or plates are prepared in the following manner: To a solution of 0.15 grams of the organic photoconductive compound and 0.002 grams of a sensitizing dye in 5 ml. of methylene chloride is added 0.050 grams of Vitel PE-l0l* *Vitel PE- 101 is a trademark of Goodyear Tire & Rubber Company for a copolyester of terephthalic acid with a glycol mixture having a 9:1 molar ratio of ethylene glycol and 2,2-bis-(4-B-hydroxyethoxyphenyl) propane. polyester. The mixture is agitated to obtain a clear viscous solution or dope which is knife-coated on aluminum foil at about F. and a wet thickness of 0.004 inches. The coated product is dried and dark-conditioned by heating for fifteen hours in a dark oven at 47 C. Samples of the resulting xerographic element are charged in total darkness by means of a negative corona and then exposed through a step tablet to the light of a tungsten lamp at an illumination intensity of about 19 foot-candles for 12 seconds. The step tablet is of the carbon-grain-in-gelatin type with density increments of 0.15. An inlay of 2.0 density covers one half of the tablet to extend the range of exposure. A photographic film positive carrying printed text and numbers identifying the steps lies between the photoconduetive layer and the tablet.
The resulting electrostatic latent image is developed by cascading over the surface of the photoconduetive layer a mixture of negatively charged thermoplastic toner particles and plastic beads.
Following the described procedure a series of electrophotographic elements is prepared using the furan compounds I through V and sensitizers (or no sensitizers) as indicated in the following lists of furan compounds and sensitizers and the table hereinafter. Elements are also prepared which contain a furan compound but no sensitizer and a control element is prepared which contains only the polyester binder resin and the sensitizer B.
Furan Compounds 7 1 ,B-dlph enyllsobenzoiuran 1,3-dlphenyl-5,G-dlmethyllsobenzofuran 1,3-rliphenyl-4,7dihyd roisobenzoluran i 1,3,4,7-tetraphanyllsobenzofuran 2,6-dlpl1enylluran SENSITIZERS A. No sensitizer added.
B. 4-(4-n-amyloxyphenyl)-2,6-bis(4-ethylphenyl)- thiapyrylium perchlorate C. 2,4,7-trinitrofluorenone D. Crystal violet E. Rhodamine B F. 2,4-bis-(4-ethoxyphenyl)-6-(4-amyloxystyryl) pyrylium fluoroborate The table below records the results of the described xerographic exposure of plates containing the organic photoconductors and sensitizers indicated in the table. (Except that the data for the element containing compound IV are from a test with positive charging. in a negative charging test, which possibly failed for other reasons, the element containing this compound yielded no image). The speed designations in the table are relative speeds indicating the multiple by which the particular xerographic element is faster than the control that contains only the polyester binder resin and sensitizer B. With the procedure described the control gives a detectable image to about step 10.
Table Photoconductor Sensitizer image Formed Speed Rating I A (None) Yes 24 l B Yes 200 l C Yes 48 l D Yes 98 l E Yes 200 II A (None) Ycs 78 ll E Yes Ill C Yes 150 IV B Yes 57 IV C Yes 20 IV D No IV E Yes l5 V A (None) No V B Yes 38 V C Yes 6 V D No V E Yes 5 None A (None) No (Control) B Yes 5 C No D No E No
The results recorded in the table show that the described isobenzofuran compounds I, II and III are photoconductors of good sensitivity. They are unexpectedly superior to a simple diaryl substituted furan such as compound V. in these particular comparisons compound lV, (1,3,4,7-tetraphenyl-isobenzofuran, which is also a 1,3-diarylisobenzofuran of the type contemplated herein) is not as markedly. superior to photoconductor V and the control element as are compounds I, ll and Ill. An explanation for these results which are not as good as can be obtained with compound IV is that some crystallization of the compound occurred in this particular coating. The following example describes a coating in which substantially better results are obtained with compound lV.
EXAMPLE 2 The crystallization of the 1,3,4,7-tetraphenylisobenzo-furan encountered in Example 1 is eliminated or reduced in a photoconduetive element prepared substantially as in Example 1 but using bisphenol-A polycarbonate (Lexan polycarbonate) as the binder instead of polyester and using approximately 15 percent concentration of the compound in the coating instead of approximately 20 percent. Testing of such compositions containing compound IV and either sensitizer B 9 or sensitizer F for positive and negative charging gives the following results:
- speed Photoconductor Sensitizer Positive Negative IV E I 71 IV F 170 160 The next example illustrates the use of the following thiobenzofuran and isoindole compounds in photoconductive elements of the invention:
' asbestosis. 6551501155 1,2,3-triph enylisoindole EXAMPLE 3 Photoconductive elements of the invention containing a thiobenzofuran (compound VI) or an isoindole (compound VII) are prepared as in Example 1, using the following basic formulation:
Photoconductor 0.25 g.
Vitel 101 polyester 1.00 g.
Sensitizer 0.01 g.
Methylene chloride 9.60 g.
Results obtained with these compositions positively charged and tested as in Example 1 are as follows:
Photoconductor Senlitizer Image Formed Speed Rating Vl B Yes 200 E Yes I00 VII B Yes 50 E Yes 50 Compounds of somewhat related structure which appear to have some utility as organic photoconductors, although not having the surprisingly high sensitivity of the l,3-diarylisobenzofurans, include the following isoindoles: l-(4-dimethyl-amin0phenylisoindole, 1 phenylisoindole and l-(4-methoxyphenyl) isoindole.
The invention has been described in detail with particular reference to preferred embodiments thereof,
but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.
I claim:
1. A photoconductive element comprising an electrically conducting support and having thereon a layer comprising a polymeric binder with an organic photoconductive compound of the formula where R R R and R are hydrogen, alkyl, aryl,
-COOR, -CON(R) CN, halogen, -OR, -R'-COOR, or
-R'-CON(R) wherein R is hydrogen or alkyl and R is an alkylene radical; Ar and Ar, are aryl groups; X is O, S, or NR; and n and m are integers from 0 to 4.
2. An element according to claim 1 in which R R R and R are hydrogen or lower alkyl.
3. An element according to claim 2 in which a sensitizing dye is incorporated with the organic photoconductor compound.
4. An element according to claim 3 in which the organic photoconductor compound is 1 ,3- diphenylisobenzofuran.
5. An element according to claim 3 in which the organic photoconductor compound is l,3-diphenyl-5,6- dimethylisobenzofuran.
6. An element according to claim 3 in which the organic photoconductor compound is l,3-dipheny1-4,7- dihydroisobenzofuran.
7. An element according to claim 1 comprising a photoconductive layer coated on an electrically conducting support, said layer comprising (a) a photoconductive compound selected from the group consisting of l,3-diphenylisobenzo-furan, l,3-diphenyl-5,6- dimethylisobenzofuran and l,3diphenyl-4,7- dihydroisobenzofuran, (b) a sensitizing dye and (c) a polymeric binder.
8. An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a terephthalic polyester.
9. An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a bisphenoLA. polycarbonate.
10. An element according to claim 3 in which the organic photoconductor compound is l,2,3-
triphenylisoindole.
Claims (9)
- 2. An element according to claim 1 in which R1, R2, R3 and R4 are hydrogen or lower alkyl.
- 3. An element according to claim 2 in which a sensitizing dye is incorporated with the organic photoconductor compound.
- 4. An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenylisobenzofuran.
- 5. An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenyl-5,6-dimethylisobenzofuran.
- 6. An element according to claim 3 in which the organic photoconductor compound is 1,3-diphenyl-4,7-dihydroisobenzofuran.
- 7. An element according to claim 1 comprising a photoconductive layer coated on an electrically conducting support, said layer comprising (a) a photoconductive compound selected from the group consisting of 1,3-diphenylisobenzo-furan, 1,3-diphenyl-5,6-dimethylisobenzofuran and 1,3-diphenyl-4,7-dihydroisobenzofuran, (b) a sensitizing dye and (c) a polymeric binder.
- 8. An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a terephthalic polyester.
- 9. An element according to claim 7 in which the polymeric binder is a major component of the photoconductive layer and is a bisphenol-A polycarbonate.
- 10. An element according to claim 3 in which the organic photoconductor compound is 1,2,3-triphenylisoindole.
Applications Claiming Priority (1)
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US22377072A | 1972-02-04 | 1972-02-04 |
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US00223770A Expired - Lifetime US3784376A (en) | 1972-02-04 | 1972-02-04 | Photoconductive element containing furans, indoles, or thiophenes |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0061094A1 (en) * | 1981-03-20 | 1982-09-29 | BASF Aktiengesellschaft | Electrophotographic recording material |
US4465753A (en) * | 1982-07-08 | 1984-08-14 | Dainippon Ink And Chemicals Inc. | Indoline electrophotoconductor |
US4728593A (en) * | 1985-07-12 | 1988-03-01 | E. I. Du Pont De Nemours And Company | Photoconductive polyimide-electron donor charge transfer complexes |
US5368966A (en) * | 1992-05-14 | 1994-11-29 | Fuji Electric Co., Ltd. | Photosensitive member for electrophotography with indole derivative |
US20040195551A1 (en) * | 2001-03-12 | 2004-10-07 | Seiko Epson Corporation | Compositions, methods for producing films, functional elements, methods for producing functional elements, methods for producing electro-optical devices and methods for producing electronic apparatus |
US20110200925A1 (en) * | 2010-02-10 | 2011-08-18 | Ryota Arai | Image bearing member, image forming method, image forming apparatus, and process cartridge |
JP2012062249A (en) * | 2010-09-14 | 2012-03-29 | Ricoh Co Ltd | N-phenyl-diphenylisoindole derivative and method for manufacturing the same |
JP2012068439A (en) * | 2010-09-24 | 2012-04-05 | Ricoh Co Ltd | Electrophotographic photoreceptor, electrophotographic method, electrophotographic device, and process cartridge for electrophotographic device |
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US3174854A (en) * | 1959-04-08 | 1965-03-23 | Azoplate Corp | Electrophotographic reproduction material |
US3485625A (en) * | 1966-06-09 | 1969-12-23 | Eastman Kodak Co | Photoconductive elements containing 2,3,4,5-tetraaryl pyrrole |
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Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US3174854A (en) * | 1959-04-08 | 1965-03-23 | Azoplate Corp | Electrophotographic reproduction material |
US3485625A (en) * | 1966-06-09 | 1969-12-23 | Eastman Kodak Co | Photoconductive elements containing 2,3,4,5-tetraaryl pyrrole |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0061094A1 (en) * | 1981-03-20 | 1982-09-29 | BASF Aktiengesellschaft | Electrophotographic recording material |
US4481272A (en) * | 1981-03-20 | 1984-11-06 | Basf Aktiengesellschaft | Layered electrophotographic recording medium comprising heterocyclic nitrogen containing organic dye compounds |
US4465753A (en) * | 1982-07-08 | 1984-08-14 | Dainippon Ink And Chemicals Inc. | Indoline electrophotoconductor |
US4728593A (en) * | 1985-07-12 | 1988-03-01 | E. I. Du Pont De Nemours And Company | Photoconductive polyimide-electron donor charge transfer complexes |
US5368966A (en) * | 1992-05-14 | 1994-11-29 | Fuji Electric Co., Ltd. | Photosensitive member for electrophotography with indole derivative |
US20040195551A1 (en) * | 2001-03-12 | 2004-10-07 | Seiko Epson Corporation | Compositions, methods for producing films, functional elements, methods for producing functional elements, methods for producing electro-optical devices and methods for producing electronic apparatus |
US7198814B2 (en) * | 2001-03-12 | 2007-04-03 | Seiko Epson Corporation | Compositions, methods for producing films, functional elements, methods for producing functional elements, method for producing electro-optical devices and methods for producing electronic apparatus |
US20110200925A1 (en) * | 2010-02-10 | 2011-08-18 | Ryota Arai | Image bearing member, image forming method, image forming apparatus, and process cartridge |
US8889324B2 (en) * | 2010-02-10 | 2014-11-18 | Ricoh Company, Ltd. | Image bearing member, image forming method, image forming apparatus, and process cartridge |
JP2012062249A (en) * | 2010-09-14 | 2012-03-29 | Ricoh Co Ltd | N-phenyl-diphenylisoindole derivative and method for manufacturing the same |
JP2012068439A (en) * | 2010-09-24 | 2012-04-05 | Ricoh Co Ltd | Electrophotographic photoreceptor, electrophotographic method, electrophotographic device, and process cartridge for electrophotographic device |
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