US5114337A
Expired / Lapsed
US
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Heat fixing method
Assignee: Canon Inc
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Filing: 1990-05-11
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Granted: 1992-05-19
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Expires: 2010-05-11
Abstract
Abstract A method of heat fixing a toner image comprises heat fixing a toner image on a recording material with a heating member fixed and supported and a pressurizing member which is opposed to, in pressure contact with said heating member and adapted to bring said recording material into pressure contact with said heat member through a film, wherein said toner image is formed of a toner, said toner comprises a binder resin and a colorant, said binder resin has a melt viscosity of 0.1 to 10 7 centipoise at 140° C. and the gradient (θ) of the straight line represented by the following formula comprising the reciprocal number (1/T) of the absolute temperature when the toner is melted by heating with the heating member and the logarithm (log η) of the melt viscosity of the binder resin at this time is 10 2 to 3×10 3 : log η=θ·(1/T)+B' (where B' represents a constant); and peeling off said film from the surface of the recording material having the fixed toner image under the temperature condition which is higher than the temperature T 4 of the maximum value of the heat absorption peak of said toner, wherein the temperature T 4 of the maximum value of the heat absorption peak of the toner is 40 to 120 C., and the temperature T 3 when the film is pelled off from the fixed toner image surface is higher by 30° C. or more than the temperature T 4 .
Inventors
- 👤 Masuo Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:39
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/20; G03G11/00; G03G9/00; G03G9/08; G03G9/087; G03G9/08784; G03G9/08797
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
249 words
A method of heat fixing a toner image, comprising heat fixing a toner image on a recording material with a heating member fixed and supported and a pressurizing member which is opposed to, in pressure contact with said heating member and adapted to bring said recording material into pressure contact with said heating member through a film, wherein said toner image is formed of a toner, said toner comprises a binder resin and a colorant, said binder resin has a melt viscosity of 0.1 to 10 7 centipoise at 140° C. and the gradient (θ) of the straight line represented by the following formula comprising the reciprocal number (1/T) of the absolute temperature when the toner is melted by heating with the heating member and the logarithm (log n ) of the melt viscosity of the binder resin at this time is 10 2 to 3×10 3 : log .sup.n =θ.(1/T)+B' (where B' represents a constant); and peeling off said film from the surface of the recording material having the fixed toner image under the temperature condition which is higher than the temperature T 4 of the maximum value of the heat absorption peak of said toner, wherein the temperature T 4 of the maximum value of the heat absorption peak of the toner is 40° to 120° C., and the temperature T 3 when the film is peeled off from the fixed toner image surface is higher by 30° C. or more than the temperature T 4 .
Claim 2
Independent Claim
249 words
A method of heat fixing a toner image, comprising heat fixing a toner image on a recording material with a heating member fixed and supported and a pressurizing member which is opposed to, in pressure contact with said heating member and adapted to bring said recording material into pressure contact with said heating member through a film, wherein said toner image is formed of a toner, said toner comprises a binder resin and a colorant, said binder resin has a melt viscosity of 0.1 to 10 7 centipoise at 140° C. and the gradient (θ) of the straight line represented by the following formula comprising the reciprocal number (1/T) of the absolute temperature when the toner is melted by heating with the heating member and the logarithm (log n ) of the melt viscosity of the binder resin at this time is 10 2 to 3×10 3 : log .sup.n =θ.(1/T)+B' (where B' represents a constant); and peeling off said film from the surface of the recording material having the fixed toner image under the temperature condition which is higher than the temperature T 4 of the maximum value of the heat absorption peak of said toner, wherein the temperature T 4 of the maximum value of the heat absorption peak of the toner is 40° to 120° C., and the temperature T 3 when the film is peeled off from the fixed toner image surface is higher by 30° C. or more than the temperature T 4 .
Claim 3
Dependent Claim
64 words
The method according to claim 1, wherein the toner contains colloidal silica treated with a silicone oil, the binder resin of the toner has a melt viscosity at 140° C. of 1 to 9×10 4 centipoise, and the toner image is heat fixed with a fixing film having a layer formed of a polyimide resin and a layer formed of a fluorine type resin.
Claim 4
Dependent Claim
35 words
The method according to claim 1, wherein the temperature T 4 is 55° C. to 100° C., and the temperature T 3 is higher by 40° to 150° C. than the temperature T 4 .
Claim 5
Dependent Claim
23 words
The method according to claim 1, wherein the binder resin has a melt viscosity at 140° C. of 1 to 9×10 4 centipoise.
Claim 6
Dependent Claim
24 words
The method according to claim 1, wherein the binder resin has a melt viscosity at 140° C. of 10 2 to 2×10 4 .
Claim 7
Dependent Claim
16 words
The method according to claim 1, wherein the fixing film is formed of a polyimide resin.
Claim 8
Dependent Claim
27 words
The method according to claim 1, wherein the fixing film has a layer formed of a polyimide resin and a layer formed of a fluorine type resin.
Claim 9
Dependent Claim
19 words
The method according to claim 7, wherein the layer formed of a fluorine type resin contains an electroconductive material.
Claim 10
Dependent Claim
14 words
The method according to claim 1, wherein the toner contains colloidal silica fine powder.
Claim 11
Dependent Claim
18 words
The method according to claim 9, wherein the colloidal silica fine powder is treated with a silicone oil.
Claim 12
Dependent Claim
30 words
The method according to claim 9, wherein the colloidal silica fine powder is treated with 1 to 50 parts by weight of a silicone oil per 100 parts by weight.
Claim 13
Dependent Claim
30 words
The method according to claim 11, wherein the colloidal silica is mixed in an amount of 0.1 to 5 parts by weight per 100 parts by weight of the toner.
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