US4296171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer sheet suitable for electrophotographic pressure-fixing
Assignee: Ricoh Co Ltd
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Filing: 1979-09-06
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Granted: 1981-10-20
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Expires: 1999-09-06
Abstract
Abstract A transfer sheet suitable for electrophotographic pressure fixing, which comprises a paper support and a thin layer of resin formed by coating, thereon as transfer-acceptable layer said resin being obtained by neutralizing carboxyl radical of a copolymer comprising methyl methacrylate, alkyl acrylate and/or alkyl methacrylate and unsaturated carboxylic acid as constitution units with ammonia or some volatile amine.
Inventors
- 👤 Mitsuru Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:18
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/0006; G03G7/002; G03G7/0026; G03G7/004; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/26; Y10T428/269; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
196 words
A transfer sheet adapted to have an electrophotographic image of dry toner affixed thereto by pressure, comprising: a paper support coated on at least one surface thereof with a transfer-accepting layer wherein the amount of said transfer-accepting layer is from 1 to 10 g per square meter of said paper support, on a dry basis, said transfer-accepting layer having been formed by applying on said paper support a coating of an aqueous solution or an aqueous dispersion of a resin obtained by neutralizing, with ammonia or volatime amine, the carboxyl groups of a copolymer consisting essentially of from 40 to 90% by weight of methyl methacrylate, from 3 to 60% by weight of acrylate selected from the group consisting of alkyl acrylate having 6 or more carbon atoms in the alkyl group, alkyl methacrylate having 6 or more carbon atoms in the alkyl group and mixtures thereof, and from 0.5 to 10% by weight of unsaturated carboxylic acid, said resin being water-soluble or water-dispersible and having a gravimetric average molecular weight of from 5,000 to 100,000, and then drying said coating to form said transfer-accepting layer, said transfer-accepting layer having fine cracks on the surface thereof.
Claim 2
Dependent Claim
196 words
A transfer sheet adapted to have an electrophotographic image of dry toner affixed thereto by pressure, comprising: a paper support coated on at least one surface thereof with a transfer-accepting layer wherein the amount of said transfer-accepting layer is from 1 to 10 g per square meter of said paper support, on a dry basis, said transfer-accepting layer having been formed by applying on said paper support a coating of an aqueous solution or an aqueous dispersion of a resin obtained by neutralizing, with ammonia or volatime amine, the carboxyl groups of a copolymer consisting essentially of from 40 to 90% by weight of methyl methacrylate, from 3 to 60% by weight of acrylate selected from the group consisting of alkyl acrylate having 6 or more carbon atoms in the alkyl group, alkyl methacrylate having 6 or more carbon atoms in the alkyl group and mixtures thereof, and from 0.5 to 10% by weight of unsaturated carboxylic acid, said resin being water-soluble or water-dispersible and having a gravimetric average molecular weight of from 5,000 to 100,000, and then drying said coating to form said transfer-accepting layer, said transfer-accepting layer having fine cracks on the surface thereof.
Claim 3
Dependent Claim
37 words
A transfer sheet according to claim 1, in which said transfer-accepting layer contains rubber latex, acrylic emulsion or vinyl acetate emulsion in an amount of up to 50% by weight, based on the weight of said layer.
Claim 4
Dependent Claim
28 words
A transfer sheet according to claim 1 or 2, in which a pigment having a particle size of 0.5 to 5 μm is mixed in said transfer-accepting layer.
Claim 5
Dependent Claim
20 words
A transfer sheet according to claim 1 or 2, in which a coloring agent is mixed in said transfer-accepting layer.
Claim 6
Dependent Claim
30 words
a transfer sheet according to claim 4, in which the amount of said coloring agent is 2 parts by weight or less per 1 part by weight of said resin.
Claim 7
Dependent Claim
117 words
A transfer sheet as claimed in claim 1 in which the amount of said transfer-accepting layer is from 2 to 5 g per square meter, on a dry basis; and, in said copolymer, the amount of said methyl methacrylate is from 60 to 90% by weight, the amount of said acrylate is from 5 to 30% by weight and said alkyls have 10 to 20 carbon atoms, and the amount of said unsaturated carboxylic acid is from 2 to 6% by weight and said unsaturated carboxylic acid is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid and mixtures thereof; and the gravimetric average molecular weight of said resin is from 10,000 to 40,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |