US4600673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicone release coatings for efficient toner transfer
Assignee: 3M Co
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Filing: 1985-04-22
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Granted: 1986-07-15
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Expires: 2005-04-22
Abstract
Abstract A photoconductive assembly comprising a conductive substrate, a photoconductive layer and a topcoat comprised of a cured film-forming silicone polymer. The topcoat has a thickness of between 5 and 300 nm and a melting point above 100° C.
Inventors
- 👤 William A. Hendrickson
- 👤 Jack L. Evans
- 👤 Kenneth R. Paulson
- 👤 Robert W. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:17
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G5/147; G03G5/14708; G03G5/14713; G03G5/14747; G03G5/14773
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
A photoconductive assembly comprising an electroconductive substrate, a layer of photoconductive material, and a topcoat comprised of a cured silicone polymer having a dry thickness from 12.5 nm to 70 nm and which is capable of being formed by applying to the photoconductive layer at a wet coating thickness of 9 micrometers a solution comprising from 0.25 to 1.0 parts by weight of a curable silicone polymer in at least one organic non-polar solvent and drying said solution thereon to form said cured silicone top coat, which cured silicone top coat has a melting point above 100° C.
Claim 2
Dependent Claim
98 words
A photoconductive assembly comprising an electroconductive substrate, a layer of photoconductive material, and a topcoat comprised of a cured silicone polymer having a dry thickness from 12.5 nm to 70 nm and which is capable of being formed by applying to the photoconductive layer at a wet coating thickness of 9 micrometers a solution comprising from 0.25 to 1.0 parts by weight of a curable silicone polymer in at least one organic non-polar solvent and drying said solution thereon to form said cured silicone top coat, which cured silicone top coat has a melting point above 100° C.
Claim 3
Dependent Claim
15 words
The assembly of claim 1 wherein the layer of photoconductive material comprises an organic photoconductor.
Claim 4
Dependent Claim
28 words
The assembly of claim 2 wherein the organic photoconductor is selected from the group consisting of poly-N-vinylcarbazole, bis-benzocarbazole methanes, oxydiazoles, phthalocyanine pigments, triarylmethanes, aromatic amines, hydrazones, and pyrazolines.
Claim 5
Dependent Claim
18 words
The assembly of claim 1 wherein the layer of photoconductive material comprises inorganic photoconductor dispersed in a binder.
Claim 6
Dependent Claim
100 words
The assembly of claim 1 wherein the cured silicone polymer is formed by cross-linking a cross-linkable silicone polymer having the formula ##STR9## where R 1 , R 2 , R 3 are independently selected from the group consisting of hydrogen, hydroxyl group, alkyl radical, substituted alkyl radical, cycloalkyl radical, aralkyl radical, aryl radical, and alkenyl radical, R 4 , R 5 , R 6 are independently selected from the group consisting of alkyl radical, substituted alkyl radical, aryl radical, alkenyl radical, and epoxy radical, and n and m are positive integers or zero such that n+m is 50 to 15,000.
Claim 7
Dependent Claim
14 words
The assembly of claim 5 wherein the cross-linkable silicone polymer is a silanol-terminated dimethylsiloxane.
Claim 8
Dependent Claim
15 words
The assembly of claim 5 wherein the cross-linkable silicone polymer is a vinyl functional polydimethylsiloxane.
Claim 9
Dependent Claim
15 words
The assembly of claim 5 wherein the cross-linkable silicone polymer is a silanol-terminated epoxy siloxane.
Claim 10
Dependent Claim
22 words
The assembly of claim 1 wherein the tack value of the cured silicone polymer layer is less than 300 g/cm 2 .
Claim 11
Dependent Claim
44 words
A process for producing a toner image copy comprising the steps of (1) imagewise exposing the sensitized photoconductive assembly of claim 1 to radiation, (2) developing said imagewise exposed assembly with a liquid toner, and (3) transferring the toned image to a receptor surface.
Claim 12
Dependent Claim
14 words
The process of claim 10 wherein the transfer step is effected by flash/pressure transfer.
Claim 13
Dependent Claim
14 words
The process of claim 10 wherein the transfer step is effected by thermal/pressure transfer.
Claim 14
Dependent Claim
17 words
The process of claim 10 wherein the transferred image exhibits a resolving power greater than 80 lp/mm.
Claim 15
Dependent Claim
45 words
A photoconductive assembly comprising an electroconductive substrate, a layer of photoconductive material, and a top coat comprised of a cured silicone polymer, which, when cured, has a dry thickness of from about 12.5 to about 50 nm, and has a melting point above 100° C.
Claim 16
Dependent Claim
45 words
A photoconductive assembly comprising an electroconductive substrate, a layer of photoconductive material, and a top coat comprised of a cured silicone polymer, which, when cured, has a dry thickness of from about 12.5 to about 50 nm, and has a melting point above 100° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |