US4507374A — Electrophotographic recording medium containing τ…

Claim 1

Independent Claim 40 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of a metal-free phthalocyanine selected from the group consisting of τ, τ', η, η' form metal-free phthalocyanine and mixtures thereof, and an electroconductive substrate supporting the layer.

Claim 2

Dependent Claim 40 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of a metal-free phthalocyanine selected from the group consisting of τ, τ', η, η' form metal-free phthalocyanine and mixtures thereof, and an electroconductive substrate supporting the layer.

Claim 3

Dependent Claim 25 words

A recording medium for electrophotography as defined in claim 1, wherein the layer further contains another charge generating substance which is photosensitive to the light.

Claim 4

Dependent Claim 82 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of τ form metal-free phthalocyanine or τ' form metal-free phthalocyanine which is obtained in such a way that α form metal-free phthalocyanine is dispersed in a liquid dispersant; while the dispersed system is heated to a temperature lower than a decomposition temperature of the phthalocyanine, mechanical shearing forces are applied to the dispersed phthalocyanine particles, to change a crystalline structure thereof, and an electroconductive substrate supporting the layer thereon.

Claim 5

Dependent Claim 82 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of τ form metal-free phthalocyanine or τ' form metal-free phthalocyanine which is obtained in such a way that α form metal-free phthalocyanine is dispersed in a liquid dispersant; while the dispersed system is heated to a temperature lower than a decomposition temperature of the phthalocyanine, mechanical shearing forces are applied to the dispersed phthalocyanine particles, to change a crystalline structure thereof, and an electroconductive substrate supporting the layer thereon.

Claim 6

Dependent Claim 18 words

A recording medium for electrophotography as defined in claim 3, wherein said liquid dispersant in an aliphatic compound.

Claim 7

Dependent Claim 102 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of η form or η' form metal-free phthalocyanine which is obtained in such a way that a mixture is dispersed in a liquid dispersant, said mixture comprising (A) 100 parts by weight of metal-free phthalocyanine and (B) at most 50 parts by weight of at least one, metal-free phthalocyanines; while the dispersed system is heated to a temperature lower than a decomposition temperature of the above-mentioned mixture, mechanical shearing forces are applied to this mixture, to change a crystalline structure thereof, and an electroconductive substrate supporting the layer thereon.

Claim 8

Dependent Claim 102 words

A recording medium for electrophotography comprising a thin layer containing an effective amount of η form or η' form metal-free phthalocyanine which is obtained in such a way that a mixture is dispersed in a liquid dispersant, said mixture comprising (A) 100 parts by weight of metal-free phthalocyanine and (B) at most 50 parts by weight of at least one, metal-free phthalocyanines; while the dispersed system is heated to a temperature lower than a decomposition temperature of the above-mentioned mixture, mechanical shearing forces are applied to this mixture, to change a crystalline structure thereof, and an electroconductive substrate supporting the layer thereon.

Claim 9

Dependent Claim 18 words

A recording medium for electrophotography as defined in claim 5 wherein said liquid dispersant is an aliphatic compound.

Claim 10

Dependent Claim 53 words

A composite recording medium for electrophotography comprising a layer containing a charge generating substance and a charge transport substance, said layer being disposed on an electroconductive substrate, wherein said charge generating substance contains at least one member selected from the group consisting of τ, τ', η and η' form metal-free phthalocyanine metal-free phthalocyanine.

Claim 11

Dependent Claim 53 words

A composite recording medium for electrophotography comprising a layer containing a charge generating substance and a charge transport substance, said layer being disposed on an electroconductive substrate, wherein said charge generating substance contains at least one member selected from the group consisting of τ, τ', η and η' form metal-free phthalocyanine metal-free phthalocyanine.

Claim 12

Dependent Claim 28 words

A composite recording medium for electrophotography as defined in claim 7, wherein said charge generating substance and charge transport substance are homogeneously dispersed in a cured resinous binder.

Claim 13

Dependent Claim 32 words

A composite recording medium as defined in claim 8, wherein an amount of the charge generating substance is 20 to 200 parts by weight per 100 parts by weight of the binder.

Claim 14

Dependent Claim 51 words

A composite recording medium as defined in claim 7, wherein a first layer containing the charge transport substance has a thickness of 5 to 100 μm and a second layer containing the charge generating substance, beneath said first layer and on the substrate, has a thickness of 20 μm or less.

Claim 15

Dependent Claim 33 words

A composite recording medium as defined in claim 10, wherein the first layer has a thickness of 8 to 30 μm and the second layer has a thickness of 0.1 to 3 μm.

Claim 16

Dependent Claim 27 words

A composite recording medium as defined in claim 10, wherein the first layer is substantially transport to the light having wavelength of from 500 to 800 nm.

Claim 17

Dependent Claim 75 words

A recording medium for electrophotography comprising an electroconductive substrate, and a thin layer, supported on the substrate, containing an effective amount of a metal-free phthalocyanine selected from the group consisting of τ-form metal-free phthalocyanine, τ'-form metal-free phthalocyanine and a mixture thereof, wherein τ-form and τ'-form metal-free phthalocyanines are characterized by intense lines at Bragg angles (2θ±0.2 degrees) of 7.6, 9.2, 16.8, 17.4, 20.4 and 20.9, and 7.5, 9.1, 16.8, 17.3, 20.3, 20.8 and 27.4, respectively.

Claim 18

Dependent Claim 75 words

A recording medium for electrophotography comprising an electroconductive substrate, and a thin layer, supported on the substrate, containing an effective amount of a metal-free phthalocyanine selected from the group consisting of τ-form metal-free phthalocyanine, τ'-form metal-free phthalocyanine and a mixture thereof, wherein τ-form and τ'-form metal-free phthalocyanines are characterized by intense lines at Bragg angles (2θ±0.2 degrees) of 7.6, 9.2, 16.8, 17.4, 20.4 and 20.9, and 7.5, 9.1, 16.8, 17.3, 20.3, 20.8 and 27.4, respectively.

Claim 19

Dependent Claim 126 words

A recording medium for electrophotography comprising an electroconductive substrate, and a thin layer, supported on the substrate, containing an effective amount of a metal-free phthalocyanine selected from the group consisting of η-form metal-free phthalocyanine, η'-form metal-free phthalocyanine and a mixture thereof, wherein the η- and η'-form metal-free phthalocyanines each comprises 100 parts by weight of a metal-free phthalocyanine and up to 50 parts by weight of at least one of a metal-free phthalocyanine having a substituent for benzene nuclei, a porphin-type compound, a metal phthalocyanine which may have a substituent for benzene nuclei, and the η-form and η'-form are characterized by intense lines at Bragg angles (2θ±0.2 degrees) of 7.6, 9.2, 16.8, 17.4 and 28.5, and 7.5, 9.1, 16.8, 17.3, 20.3, 20.8, 21.4 and 27.4, respectively.

Claim 20

Dependent Claim 126 words

A recording medium for electrophotography comprising an electroconductive substrate, and a thin layer, supported on the substrate, containing an effective amount of a metal-free phthalocyanine selected from the group consisting of η-form metal-free phthalocyanine, η'-form metal-free phthalocyanine and a mixture thereof, wherein the η- and η'-form metal-free phthalocyanines each comprises 100 parts by weight of a metal-free phthalocyanine and up to 50 parts by weight of at least one of a metal-free phthalocyanine having a substituent for benzene nuclei, a porphin-type compound, a metal phthalocyanine which may have a substituent for benzene nuclei, and the η-form and η'-form are characterized by intense lines at Bragg angles (2θ±0.2 degrees) of 7.6, 9.2, 16.8, 17.4 and 28.5, and 7.5, 9.1, 16.8, 17.3, 20.3, 20.8, 21.4 and 27.4, respectively.

Claim 21

Dependent Claim 30 words

A recording medium according to claim 14, wherein η- and η'-form metal-free phthalocyanines are further characterized by having additional intense lines of 21.5 and 27.5, and 22.1 and 28.5, respectively.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-03-25	1988-09-24	1989-03-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-03-25	1992-09-24	1993-03-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-03-25	1996-09-24	1997-03-26	$7700.00	Window Closed / Lapsed

Electrophotographic recording medium containing τ and η metal-free phthalocyanine

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