US4328265A
Expired / Lapsed
US
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Process for preparation of a transfer sheet for electrostatic photography or printing
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1979-05-16
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Granted: 1982-05-04
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Expires: 1999-05-16
Abstract
Abstract A transfer sheet for electrostatically transferring thereon an electrically conductive or electrically semi-conductive toner in electrostatic photography or electrostatic printing, which comprises a substrate and a toner-receiving layer formed on at least one surface of the substrate, which toner-receiving layer contains a composition comprising (A) a thermoplastic acrylic polymer having a carboxyl group content of 2 to 30% by weight and (B) a thermosetting resin reactive with the acrylic polymer (A), is produced by coating on at least one surface of the substrate an aqueous composition containing the thermoplastic acrylic polymer in the form of an aqueous emulsion and the thermosetting resin in the form of an aqueous solution and drying the coated substrate to form a toner-receiving layer on the surface of the substrate. In this transfer sheet, the electric resistance can be maintained at a high level even under high humidity conditions, and a toner image can be transferred on this transfer sheet at a high transfer efficiency.
Inventors
- 👤 Mamoru Kato
- 👤 Susumu Yamaura
- 👤 Yasutoki Kamezawa
- 👤 Tatsuo Aizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:35
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/0006; G03G7/002; G03G7/0026; G03G7/0046; G03G13/00; G03G13/14; G03G13/16; G03G7/004; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906; Y10T428/31909; Y10T428/31913; Y10T428/31928
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
152 words
A process for preparing a transfer sheet for electrostatically transferring thereon an electrically conductive or electrically semi-conductive toner, which comprises coating on at least one surface of a substrate an aqueous composition containing (A) a thermoplastic acrylic polymer having a carboxylic group content of 2 to 30% by weight in the form of an aqueous emulsion and (B) a thermosetting resin reactive with said acrylic polymer (A) in the form of an aqueous solution, said thermosetting resin (B) being a glycidyl ether of a polyalkylene polyol having an epoxy equivalent of 100 to 400, said thermoplastic acrylic resin (A) and said thermosetting resin (B) being present at an (A)/(B) weight ratio ranging from 100/5 to 100/100 based on solids, said aqueous composition being coated in an amount of 2 to 20.g/m 2 on the dry basis, and drying the coated substrate to form a toner-receiving layer on the surface of the substrate.
Claim 2
Dependent Claim
152 words
A process for preparing a transfer sheet for electrostatically transferring thereon an electrically conductive or electrically semi-conductive toner, which comprises coating on at least one surface of a substrate an aqueous composition containing (A) a thermoplastic acrylic polymer having a carboxylic group content of 2 to 30% by weight in the form of an aqueous emulsion and (B) a thermosetting resin reactive with said acrylic polymer (A) in the form of an aqueous solution, said thermosetting resin (B) being a glycidyl ether of a polyalkylene polyol having an epoxy equivalent of 100 to 400, said thermoplastic acrylic resin (A) and said thermosetting resin (B) being present at an (A)/(B) weight ratio ranging from 100/5 to 100/100 based on solids, said aqueous composition being coated in an amount of 2 to 20.g/m 2 on the dry basis, and drying the coated substrate to form a toner-receiving layer on the surface of the substrate.
Claim 3
Dependent Claim
36 words
A process for preparing a transfer sheet according to claim 1 wherein said polymer (A) and said resin (B) are present in the aqueous composition at a total resin concentration of 5 to 40% by weight.
Claim 4
Dependent Claim
29 words
A process for preparing a transfer sheet according to claim 1 wherein said thermoplastic acrylic polymer is present in the aqueous composition in the form of an ammonium salt.
Claim 5
Dependent Claim
51 words
A process for preparing a transfer sheet according to claim 1 wherein said thermoplastic acrylic polymer (A) is a copolymer composed of 4 to 60% by weight of an ethylenically unsaturated carboxylic acid and 40 to 96% by weight of an ethylenically unsaturated monomer other than said ethylenically unsaturated carboxylic acid.
Claim 6
Dependent Claim
40 words
A process for preparing a transfer sheet according to claim 4 wherein said ethylenically unsaturated monomer other than said ethylenically unsaturated carboxylic acid is a member selected from the group consisting of styrene, acrylic acid esters and methacrylic acid esters.
Claim 7
Dependent Claim
92 words
A process for preparing a transfer sheet according to claim 1 wherein said thermoplastic acrylic polymer (A) is a copolymer composed of (a) 4 to 60% by weight of units represented by the following formula: ##STR7## wherein R 1 stands for a hydrogen atom or a lower alkyl group having up to 4 carbon atoms, and (b) 40 to 96% by weight of units represented by the following formula: ##STR8## wherein R 1 is as defined above and R 2 stand for a lower alkyl group having up to 4 carbon atoms.
Claim 8
Dependent Claim
40 words
A process for preparing a transfer sheet according to claim claim 6 wherein said units (b) are composed of 1 part by weight of methacrylic acid ester units and 0.02 to 0.6 part by weight of acrylic acid ester units.
Claim 9
Dependent Claim
121 words
A process for preparing a transfer sheet according to claim 1 wherein said thermoplastic acrylic polymer (A) is a copolymer composed of (a) 4 to 60% by weight of units represented by the following formula: ##STR9## wherein R 1 stands for a hydrogen atom or a lower alkyl group having up to 4 carbon atoms, (b) 10 to 75% by weight of units represented by the following formula: ##STR10## wherein R 1 is as defined above, R 2 stands for a lower alkyl group having up to 4 carbon atoms, and m is 0 or 1, and (c) 0 to 86% by weight of units represented by the following formula: ##STR11## wherein R 1 and R 2 are as defined above.
Claim 10
Dependent Claim
47 words
A process for preparing a transfer sheet according to claim 1 wherein said aqueous composition further comprises finely divided silica prepared according to the dry method in an amount of 10 to 100 parts by weight per 100 parts by weight of said thermoplastic acrylic polymer (A).
Claim 11
Dependent Claim
42 words
A process for preparing a transfer sheet according to claim 1 wherein said aqueous composition further comprises rutile type titanium dioxide in an amount of 10 to 500 parts by weight per 100 parts by weight of said thermoplastic acrylic polymer (A).
Claim 12
Dependent Claim
18 words
A process for preparing a transfer sheet according to claim 1 wherein the substrate is a paper substrate.
Claim 13
Dependent Claim
30 words
A process for preparing a transfer sheet according to claim 1 wherein the toner-receiving layer is coated on the substrate in an amount of 2 to 20 g/m 2 .
Claim 14
Dependent Claim
89 words
A process for preparing a transfer sheet according to claim 1 wherein the saturation voltage retain ratio of said transfer sheet under high humidity conditions (Rγ), which is defined by the following formula: Rγ=(V.sub.100 /V.sub.40) wherein V 40 indicates the saturation voltage of the transfer sheet as measured at a temperature of 20° C. and a relative humidity of 40% and V 100 represents the saturation voltage of the transfer sheet as measured at a temperature of 40° C. and a relative humidity of 100%, is at least 0.7.
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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |