US5698320A
Expired / Lapsed
US
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Image forming device
Assignee: Fujitsu Ltd
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Filing: 1995-04-28
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Granted: 1997-12-16
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Expires: 2015-04-28
Abstract
Abstract An image forming device is provided which can prolong the service life of a fixing roll and provide a good anti-offset property, an image having high surface smoothness and good printing properties. A fixer for electrophotography, wherein an electrostatic latent image is developed, comprises a fluororesin-coated fixing roll (2, 9) for fixing a toner and a mechanism (5, 12, 12a, 12b) for coating a fluorosilicone polymer as a release agent onto the surface of the fixing roll.
Inventors
- 👤 Katsuji Ebisu
- 👤 Toshiaki Narusawa
- 👤 Norio Sawatari
- 👤 Takahiro Kashikawa
- 👤 Tomoaki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025; G03G2215/00; G03G2215/20; G03G2215/2093; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 48
Claim 1
Independent Claim
55 words
An image forming device for use in electrophotography wherein an electrostatic latent image is developed, said device comprising a fixer provided with a fixing roll coated with an outermost layer of fluororesin for fixing a toner and means for coating as a release agent a fluorosilicone polymer onto the fluororesin-coated surface of the fixing roll.
Claim 2
Dependent Claim
55 words
An image forming device for use in electrophotography wherein an electrostatic latent image is developed, said device comprising a fixer provided with a fixing roll coated with an outermost layer of fluororesin for fixing a toner and means for coating as a release agent a fluorosilicone polymer onto the fluororesin-coated surface of the fixing roll.
Claim 3
Dependent Claim
17 words
The image forming device according to claim 1, wherein said fluorosilicone polymer has a long-chain fluoroalkyl group.
Claim 4
Dependent Claim
53 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 1: ##STR18## wherein R 1 represents an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 2 to 15 carbon atoms.
Claim 5
Dependent Claim
53 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 2: ##STR19## wherein R 1 represents an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 3 to 9 carbon atoms.
Claim 6
Dependent Claim
49 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 3: ##STR20## wherein R 1 and R 2 represent an alkylene or phenylene group and R f1 and R f2 represent a perfluoroalkyl group having 2 to 15 carbon atoms.
Claim 7
Dependent Claim
49 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 4: ##STR21## wherein R 1 and R 2 represent an alkylene or phenylene group and R f1 and R f2 represent a perfluoroalkyl group having 3 to 9 carbon atoms.
Claim 8
Dependent Claim
55 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is a polymer prepared by polymerizing a cyclic polysiloxane having a fluoroalkyl group in an inert solvent capable of dissolving the cyclic polysiloxane and a polymer of the cyclic polysiloxane in the presence of a basic polymerization catalyst and then terminating the polymerization.
Claim 9
Dependent Claim
56 words
The image forming device according to claim 7, wherein said cyclic polysiloxane is a cyclic trisiloxane represented by the following chemical formula 5: ##STR22## wherein R 1 represents an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 2 to 15 carbon atoms.
Claim 10
Dependent Claim
56 words
The image forming device according to claim 7, wherein said cyclic polysiloxane is a cyclic trisiloxane represented by the following chemical formula 6: ##STR23## wherein R 1 represents an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 3 to 9 carbon atoms.
Claim 11
Dependent Claim
52 words
The image forming device according to claim 7, wherein said cyclic polysiloxane is a cyclic trisiloxane represented by the following chemical formula 7: ##STR24## wherein R 1 and R 2 represent an alkylene or phenylene group and R f1 and R f2 represent a perfluoroalkyl group having 2 to 15 carbon atoms.
Claim 12
Dependent Claim
52 words
The image forming device according to claim 7, wherein said cyclic polysiloxane is a cyclic trisiloxane represented by the following chemical formula 8: ##STR25## wherein R 1 and R 2 represent an alkylene or phenylene group and R f1 and R f2 represent a perfluoroalkyl group having 3 to 9 carbon atoms.
Claim 13
Dependent Claim
32 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is a mixture of fluorosilicone polymers different from each other in the number of carbon atoms in R f .
Claim 14
Dependent Claim
20 words
The image forming device according to claim 1, wherein said fluorosilicone polymer has a fluorine content of 5 to 80%.
Claim 15
Dependent Claim
20 words
The image forming device according to claim 1, wherein said fluorosilicone polymer has a fluorine content of 20 to 60%.
Claim 16
Dependent Claim
32 words
The image forming device according to claim 1, wherein said fluorosilicone polymer has a number average molecular weight of 1000 to 30000 and a weight average molecular weight of 1500 to 40000.
Claim 17
Dependent Claim
30 words
The image forming device according to claim 1, wherein said fluorosilicone polymer having a molecular weight of not more than 500 occupies less than 5% of the whole fluorosilicone polymer.
Claim 18
Dependent Claim
30 words
The image forming device according to claim 1, wherein said fluorosilicone polymer having a molecular weight of not more than 1500 occupies less than 5% of the whole fluorosilicone polymer.
Claim 19
Dependent Claim
24 words
The image forming device according to claim 1, wherein said fluorosilicone polymer has a surface tension of not more than 20 dyn/cm 2 .
Claim 20
Dependent Claim
38 words
The image forming device according to claim 1, wherein the fluorosilicone polymer has a viscosity of 10 to 3000 cSt at 25° C. and an oil feed mechanism is provided as a mechanism for coating the release agent.
Claim 21
Dependent Claim
43 words
The image forming device according to claim 1, wherein the fluorosilicone polymer has a viscosity of 1000 to 60000 cSt at 25° C. and a cleaning member as a mechanism for coating the release agent is provided in press contact with the roll.
Claim 22
Dependent Claim
25 words
The image forming device according to claim 1, wherein the contact angle of the fluorosilicone polymer with a teflon plate is not more than 20°.
Claim 23
Dependent Claim
18 words
The image forming method according to claim 1, wherein said fluorosilicone polymer does not vaporize at 200° C.
Claim 24
Dependent Claim
23 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is used in the form of a mixture with silicone oil.
Claim 25
Dependent Claim
82 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 9: ##STR26## wherein R 1 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 represent an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 2 to 15 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 26
Dependent Claim
82 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 10: ##STR27## wherein R 1 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 represent an alkylene or phenylene group, R 2 represents an alkyl, aryl, or olefinically unsaturated group and R f represents a perfluoroalkyl group having 3 to 9 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 27
Dependent Claim
85 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 11: ##STR28## wherein R 1 , R 3 , R 4 , R 5 , R 7 , and R 8 represent an alkylene or phenylene group, R 2 and R 6 represent an alkyl, aryl, or olefinically unsaturated group and R f1 and R f2 represent a perfluoroalkyl group having 2 to 15 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 28
Dependent Claim
85 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 12: ##STR29## wherein R 1 , R 3 , R 4 , R 5 , R 7 , and R 8 represent an alkylene or phenylene group, R 2 and R 6 represent an alkyl, aryl, or olefinically unsaturated group and R f1 and R f2 represent a perfluoroalkyl group having 3 to 9 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 29
Dependent Claim
44 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 13: ##STR30## wherein R f represents a perfluoroalkyl group having 2 to 15 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 30
Dependent Claim
44 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 14: ##STR31## wherein R f represents a perfluoroalkyl group having 3 to 9 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 31
Dependent Claim
63 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is a polymer prepared by polycondensing a co-hydrolyzate of R f C 2 H 4 (CH 3 )SiCl 2 and (CH 3 ) 2 SiCl 2 in the presence of (CH 3 ) 3 SiOSi(CH 3 ) 3 as a molecular weight modifier and an acid catalyst or an alkali catalyst.
Claim 32
Dependent Claim
65 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is a polymer prepared by ring-opening polymerization of R f C 2 H 4 (CH 3 )SiO! x and (CH 3 ) 2 SiO! y , wherein x and y are an integer of 3 to 5, in the presence of (CH 3 ) 3 SiOSi(CH 3 ) 3 and an acid catalyst.
Claim 33
Dependent Claim
47 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 15: ##STR32## wherein R f1 and R f2 represent a perfluoroalkyl group having 2 to 15 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 34
Dependent Claim
47 words
The image forming device according to claim 1, wherein said fluorosilicone polymer is represented by the following chemical formula 16: ##STR33## wherein R f1 and R f2 represent a perfluoroalkyl group having 3 to 9 carbon atoms and m and n are integers satisfying the formula n/(n+m)≧0.1.
Claim 35
Dependent Claim
21 words
The image forming device according to claim 1, wherein the fixing roll applies pressure of 1 to 4 kgf/cm 2 .
Claim 36
Dependent Claim
21 words
The image forming device according to claim 1, wherein the fluororesin coated on the surface of the roll is perfluoroalkoxy resin.
Claim 37
Dependent Claim
20 words
The image forming device according to claim 1, wherein the fluororesin coated on the surface of the roll is polytetrafluoroethylene.
Claim 38
Dependent Claim
16 words
The image forming device according to claim 1, wherein the fluororesin contains a conductive fine powder.
Claim 39
Dependent Claim
20 words
The image forming device according to claim 1, wherein the coating thickness of the fluororesin is 10 to 100 μm.
Claim 40
Dependent Claim
20 words
The image forming device according to claim 1, further comprising means for heating the roll to 160° to 200° C.
Claim 41
Dependent Claim
29 words
The image forming device according to claim 1, wherein the roll has an intermediate layer formed of an elastic material having a rubber hardness of 10 to 60 degrees.
Claim 42
Dependent Claim
18 words
The image forming device according to claim 40, wherein the intermediate layer is formed of a silicone rubber.
Claim 43
Dependent Claim
25 words
The image forming device according to claim 1, wherein image formation by electrophotography is carried out at a process speed of 10 to 300 m/sec.
Claim 44
Dependent Claim
28 words
The image forming device according to claim 1, wherein image formation by electrophotography is monochrome printing to provide a print having a glossiness of not less than 10.
Claim 45
Dependent Claim
21 words
The image forming device according to claim 1, wherein image formation by electrophotography is color printing using two or more colors.
Claim 46
Dependent Claim
16 words
The image forming device according to claim 1, wherein image formation by electrophotography is full-color printing.
Claim 47
Dependent Claim
44 words
The image forming device according to claim 1, wherein the toner is provided with a viscoelasticity such that, at 150° C., the loss elastic modulus is 10 to 10 5 dyn/cm 2 and the storage modulus is 10 to 10 5 dyn/cm 2 .
Claim 48
Dependent Claim
21 words
The image forming device according to claim 1, wherein absorption of the release agent into the toner is less than 1%.
References Cited (Backward Citations)
JPS5814173A
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JPS6317934A
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JPS63113580A
Cited
US5102741A
Cited
JPH03190951A
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US5327202A
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JPH0596658A
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JPH05202205A
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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) | 2000-12-15 | 2001-06-16 | 2001-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-15 | 2005-06-16 | 2005-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-15 | 2009-06-16 | 2009-12-16 | $7700.00 | Window Closed / Lapsed |