Patent US2040225A successfully refreshed from Google Patents.
Patent US4259425A successfully refreshed from Google Patents.
US4259425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrographic recording material
Assignee: Solutia Inc
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Filing: 1979-05-11
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Granted: 1981-03-31
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Expires: 1999-05-11
Abstract
Abstract An electrographic recording material comprising a conductive sheet support coated with an electrically insulating layer comprising an intimate blend of a polymeric binder and up to 500 parts of an inert finely divided pigment per 100 parts by weight of polymeric binder. The binder comprises from about 40 to about 90 parts by weight of a poly(vinyl acetal) and from about 10 to about 60 parts by weight of a polystyrene or a poly( alpha -methylstyrene). The electrographic recording material exhibits improved toner adhesion.
Inventors
- 👤 Irving Serlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:44
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/0202; G03G5/0205; G03G5/0208; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24934; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31899; Y10T428/31902; Y10T428/31906; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
An electrographic recording material comprising a conductive sheet support coated on at least one side with an electrically insulating layer comprising an intimate blend of a polymeric binder and up to 500 parts by weight of a finely divided pigment per 100 parts by weight of polymeric binder wherein the polymeric binder comprises an intimate blend of from about 40 to about 90 parts by weight of a polyvinyl acetal and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500, wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
Claim 2
Dependent Claim
160 words
An electrographic recording material comprising a conductive sheet support coated on at least one side with an electrically insulating layer comprising an intimate blend of a polymeric binder and up to 500 parts by weight of a finely divided pigment per 100 parts by weight of polymeric binder wherein the polymeric binder comprises an intimate blend of from about 40 to about 90 parts by weight of a polyvinyl acetal and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500, wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
Claim 3
Dependent Claim
47 words
The recording material of claim 1 wherein the vinyl carboxylate is vinyl acetate and wherein the poly(vinyl acetal) is of weight average molecular weight in the range of from about 25,000 to about 250,000 and comprises from about 9 to about 18 weight percent vinyl alcohol units.
Claim 4
Dependent Claim
26 words
The recording material of claim 2 wherein the vinyl acetal is selected from the group consisting of vinyl formal, vinyl acetal, vinyl propional and vinyl butyral.
Claim 5
Dependent Claim
43 words
The recording material of claim 3 wherein the polymeric binder comprises up to 70 parts by weight of a plasticizing polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 300 to about 500 per 100 parts by weight of poly(vinyl acetal).
Claim 6
Dependent Claim
27 words
The recording material of claim 1 wherein the conductive sheet support is an electrically conductive paper having a conductive resin coating on at least one side thereof.
Claim 7
Dependent Claim
31 words
The recording material of claim 1 wherein the coating weight of the insulating layer is in the range of about 2 to about 20 grams per square meter of recording material.
Claim 8
Dependent Claim
28 words
The recording material of claim 4 wherein the insulating layer comprises from 50 to 200 parts by weight of pigment per 100 parts by weight of polymeric binder.
Claim 9
Dependent Claim
13 words
The recording material of claim 7 wherein the poly(vinyl acetal) is poly(vinyl butyral).
Claim 10
Independent Claim
162 words
A method of producing an electrographic recording material which comprises applying to a conductive sheet support a dispersion of a finely divided pigment in an organic solvent solution of an insulating polymeric binder and evaporating the solvent to form a continuous insulating layer in adherent contact with the conductive sheet support, wherein the insulating polymeric binder comprises from about 40 to about 90 parts by weight of a poly(vinyl acetal) polymer and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500 and wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
Claim 11
Independent Claim
162 words
A method of producing an electrographic recording material which comprises applying to a conductive sheet support a dispersion of a finely divided pigment in an organic solvent solution of an insulating polymeric binder and evaporating the solvent to form a continuous insulating layer in adherent contact with the conductive sheet support, wherein the insulating polymeric binder comprises from about 40 to about 90 parts by weight of a poly(vinyl acetal) polymer and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500 and wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
Claim 12
Independent Claim
192 words
A method of electrographic recording comprising forming an electrostatic charge pattern on an electrically insulating layer of an electrographic recording medium, developing the charge pattern by application of a toner and fixing the toner by heat or pressure, wherein the electrically insulating layer comprises an intimate blend of a polymeric binder and up to 500 parts by weight of a finely divided pigment per 100 parts by weight of polymeric binder, wherein the polymeric binder comprises from about 40 to about 90 parts by weight of poly(vinyl acetal) and from about 10 to about 60 parts by weight of poly(vinyl acetal) and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500 and wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
Claim 13
Independent Claim
192 words
A method of electrographic recording comprising forming an electrostatic charge pattern on an electrically insulating layer of an electrographic recording medium, developing the charge pattern by application of a toner and fixing the toner by heat or pressure, wherein the electrically insulating layer comprises an intimate blend of a polymeric binder and up to 500 parts by weight of a finely divided pigment per 100 parts by weight of polymeric binder, wherein the polymeric binder comprises from about 40 to about 90 parts by weight of poly(vinyl acetal) and from about 10 to about 60 parts by weight of poly(vinyl acetal) and from about 10 to about 60 parts by weight of a polystyrene or poly(α-methylstyrene) of molecular weight in the range of about 500 to about 1500 and wherein the poly(vinyl acetal) is an interpolymer of a C 5 to C 9 vinyl acetal, a C 4 to C 10 vinyl carboxylate and vinyl alcohol, of weight average molecular weight in the range of about 20,000 to 500,000, comprising less than about 30 weight percent vinyl carboxylate units and from about 5 to about 21 weight percent of vinyl alcohol units.
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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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |