Patent US5428435A successfully refreshed from Google Patents.
US5428435A
Expired / Lapsed
US
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Method of forming fixed images using encapsulated toner
Assignee: Kao Corp
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Filing: 1994-04-28
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Granted: 1995-06-27
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Expires: 2014-04-28
Abstract
Abstract A method of forming fixed images includes charging a photoconductor; exposing the photoconductor to light; applying a thermally dissociating encapsulated toner, or an encapsulated toner whose shell is made of amorphous polyester to an electrostatic latent image formed on the photoconductor, developing the electrostatic latent image to form a visible image; transferring the formed visible image to a recording medium having a softening point of 100° C. to 200° C.; and fixing the transferred visible image onto the recording medium at a temperature of not less than 80° C. and not more than 120° C. by using a fixing roller which exerts a nip pressure of from 0.1 to 4.0 kg/cm.
Inventors
- 👤 Shin-ichiro Yasuda
- 👤 Kuniyasu Kawabe
- 👤 Mitsuhiro Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:03
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/006; G03G7/0073; G03G7/008; G03G13/00; G03G13/20; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G9/00; G03G9/08; G03G9/093; G03G9/09307; G03G9/09314; G03G9/09328; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2025; G03G2215/2032
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
179 words
An electrostatic imaging process comprising: uniformly charging a photoconductor; selectively exposing said photoconductor to light so as to form an electrostatic latent image; providing a shell-encapsulated toner which shell becomes fragile upon exposure to heat within a temperature range of not less than 80° C. and not more than 120° C.; developing said electrostatic latent image with said shell-encapsulated toner, to form a visible toner image; transferring said formed visible toner image to a recording medium having a softening point of from 100° to 200° C.; preheating said shell-encapsulated toner by a heat source to a temperature of not less than 80° C. and not more than 120° C. making said shell of said toner fragile through an endless film, said endless film being positioned between said heat source and said recording medium, adjacent to but apart from said toner image on said recording medium; and fixing said transferred visible toner image onto said recording medium by pressing said toner onto said recording medium by a fixing roller which exerts a nip pressure of from 0.1 to 4 kg/cm.
Claim 2
Dependent Claim
179 words
An electrostatic imaging process comprising: uniformly charging a photoconductor; selectively exposing said photoconductor to light so as to form an electrostatic latent image; providing a shell-encapsulated toner which shell becomes fragile upon exposure to heat within a temperature range of not less than 80° C. and not more than 120° C.; developing said electrostatic latent image with said shell-encapsulated toner, to form a visible toner image; transferring said formed visible toner image to a recording medium having a softening point of from 100° to 200° C.; preheating said shell-encapsulated toner by a heat source to a temperature of not less than 80° C. and not more than 120° C. making said shell of said toner fragile through an endless film, said endless film being positioned between said heat source and said recording medium, adjacent to but apart from said toner image on said recording medium; and fixing said transferred visible toner image onto said recording medium by pressing said toner onto said recording medium by a fixing roller which exerts a nip pressure of from 0.1 to 4 kg/cm.
Claim 3
Dependent Claim
33 words
The method according to claim 1, wherein said recording medium is selected from at least one member of the group consisting of a polyethylene film, a polypropylene film, cellophane and a polymethylpentene film.
Claim 4
Dependent Claim
19 words
The method according to claim 1, wherein a heat source for heating said encapsulated toner is a heat roller.
Claim 5
Dependent Claim
182 words
The method according to claim 1, wherein said shell of said shell-encapsulated toner is thermally dissociating and comprises a heat-fusible resinous core material containing at least a coloring agent and said shell formed thereon so as to cover a surface of the said core material, wherein a main component of said shell is a resin prepared by reacting: (A) an isocyanate and/or isothiocyanate compound comprising: (1) 0 to 30 mol % of a monovalent isocyanate and/or isothiocyanate compounds, and (2) 100 to 70 mol % of at least a divalent isocyanate and/or isothiocyanate compounds with (B) an active hydrogen compound comprising: (3) 0 to 30 mol % of a compound having one active hydrogen atom reactive with isocyanate and/or isothiocyanate groups and (4) 100 to 70 mol % of a compound having at least two active hydrogen atoms reactive with isocyanate and/or isothiocyanate groups at a molar ratio of the component (A) to the component (B) of between 1:1 and 1:20, and wherein at least 30% of all of the linkages formed from the isocyanate or isothiocyanate groups are thermally dissociating linkages.
Claim 6
Dependent Claim
27 words
The method according to claim 4, wherein said thermally dissociating linkages are linkages derived from reacting phenolic hydroxyl and/or thiol groups with said isocyanate and/or isothiocyanate groups.
Claim 7
Dependent Claim
31 words
The method according to claim 4, wherein said heat-fusible core material comprises a thermoplastic resin as its main component, having a glass transition point of from 10° C. to 50° C.
Claim 8
Dependent Claim
23 words
The method according to claim 4, wherein said thermally dissociating shell-encapsulated toner has a softening point of from 80° C. to 150° C.
Claim 9
Dependent Claim
18 words
The method according to claim 1, wherein said encapsulated toner comprises a shell made of an amorphous polyester.
Claim 10
Dependent Claim
22 words
The method according to claim 8, wherein said amorphous polyester has a glass transition point of from 50° C. to 80° C.
Claim 11
Dependent Claim
60 words
The method according to claim 8, wherein said amorphous polyester is obtained by condensation polymerization between at least one alcohol monomer selected from the group consisting of dihydric alcohol monomers and trihydric or higher polyhydric alcohol monomers and at least one carboxylic acid monomer selected from the group consisting of dicarboxylic acid monomers and tricarboxylic or higher carboxylic acid monomers.
Claim 12
Dependent Claim
135 words
An electrostatic imaging process comprising: uniformly charging a photoconductor; selectively exposing said photoconductor to light so as to form an electrostatic latent image; providing a shell-encapsulated toner which shell becomes fragile upon exposure to heat within a temperature range of not less than 80° C. and not more than 120° C.; developing said electrostatic latent image with said shell-encapsulated toner, to form a visible toner image; preheating a recording medium having a softening point of from 100° to 200° C., to a temperature of from 60° to 160° C.; and substantially simultaneously transferring said visible toner image to said preheated recording medium and fixing said transferred toner image to said recording medium by pressing said toner image on said recording medium by a fixing roller exerting a nip pressure of from 0.1 to 4 kg/cm.
Claim 13
Dependent Claim
135 words
An electrostatic imaging process comprising: uniformly charging a photoconductor; selectively exposing said photoconductor to light so as to form an electrostatic latent image; providing a shell-encapsulated toner which shell becomes fragile upon exposure to heat within a temperature range of not less than 80° C. and not more than 120° C.; developing said electrostatic latent image with said shell-encapsulated toner, to form a visible toner image; preheating a recording medium having a softening point of from 100° to 200° C., to a temperature of from 60° to 160° C.; and substantially simultaneously transferring said visible toner image to said preheated recording medium and fixing said transferred toner image to said recording medium by pressing said toner image on said recording medium by a fixing roller exerting a nip pressure of from 0.1 to 4 kg/cm.
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| 3.5 Years (Year 4) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
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