US3985665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner composition for use in electrophotography comprising novel polyester binder resin
Assignee: Kao Corp
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Filing: 1974-12-27
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Granted: 1976-10-12
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Expires: 1994-12-27
Abstract
Abstract A toner composition for use in electrophotography comprising 1 to 20 parts by weight of a colorant and 80 to 99 parts by weight of a resin, wherein said resin consists essentially of A. from 55 to 100 percent by weight of a polyester resin having a softening point of 100° to 145°C. measured in accordance with ASTM-E28-51T (ring and ball method) which is obtained by the reaction of: 1. a dicarboxylic acid component containing 50 mol percent or more of a dicarboxylic acid, or an anhydride thereof, selected from the group consisting of fumaric acid, maleic acid, succinic acid, maleic anhydride and succinic anhydride; with 2. a polyol component containing more than 50 mol percent of a glycol having the formula ##SPC1## Wherein X is o or 1, and R is alkylene having 1 to 5 carbon atoms, sulfur, oxygen, ##EQU1## and ##SPC2## Is cyclohexyl and, B. the balance of said resin, i.e., from 0 to 45 percent by weight of said resin, is a resin having a softening point of 80°C to 150°C selected from the group consisting of polystyrene, rosin maleate, petroleum resin, and epoxy resin.
Inventors
- 👤 Kahei Sakaguchi
- 👤 Masaaki Minakata
- 👤 Hirotaka Takemoto
- 👤 Shigeru Takamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:28
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; C; C08; C08L; C08L67/00; G03G9/08742; G03G9/08755; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
221 words
A toner composition capable of being charged with a negative electric charge and adapted for use in electrophotographic development, consisting essentially of finely divided particles containing from 1 to 20 parts by weight of a colorant and 80 to 99 parts by weight of binder resin, said binder resin consists essentially of a. from 55 to 100 percent by weight of a polyester resin having a softening point of 100° to 145° C, said polyester resin being obtained by reacting 1. a dicarboxylic acid component consisting essentially of from 50 to 100 mol percent of a substance selected from the group consisting of fumaric acid, maleic acid, succinic acid and anhydrides thereof, the balance of said dicarboxylic acid component being one or more polyester-forming dicarboxylic acids, or anhydrides thereof, with 2. a polyol component consisting essentially of from 10 to 100 mol percent of a glycol having the formula ##SPC5## wherein x is zero or 1, R is unsubstituted alkylene having one to 5 carbon atoms, sulfur, oxygen, ##EQU2## and ##SPC6## is cyclohexyl, and the balance of said polyol component is one or more polyester-forming polyols, and b. the balance of said binder resin is a binder resin having a softening point of 80° to 150° C selected from the group consisting of polystyrene, rosin maleate, petroleum resin and epoxy resin.
Claim 2
Dependent Claim
221 words
A toner composition capable of being charged with a negative electric charge and adapted for use in electrophotographic development, consisting essentially of finely divided particles containing from 1 to 20 parts by weight of a colorant and 80 to 99 parts by weight of binder resin, said binder resin consists essentially of a. from 55 to 100 percent by weight of a polyester resin having a softening point of 100° to 145° C, said polyester resin being obtained by reacting 1. a dicarboxylic acid component consisting essentially of from 50 to 100 mol percent of a substance selected from the group consisting of fumaric acid, maleic acid, succinic acid and anhydrides thereof, the balance of said dicarboxylic acid component being one or more polyester-forming dicarboxylic acids, or anhydrides thereof, with 2. a polyol component consisting essentially of from 10 to 100 mol percent of a glycol having the formula ##SPC5## wherein x is zero or 1, R is unsubstituted alkylene having one to 5 carbon atoms, sulfur, oxygen, ##EQU2## and ##SPC6## is cyclohexyl, and the balance of said polyol component is one or more polyester-forming polyols, and b. the balance of said binder resin is a binder resin having a softening point of 80° to 150° C selected from the group consisting of polystyrene, rosin maleate, petroleum resin and epoxy resin.
Claim 3
Dependent Claim
40 words
A toner composition as claimed in claim 1, in which said polyester-forming dicarboxylic acids are selected from the group consisting of itaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, adipic acid, sebacic acid, malonic acid and oxalic acid.
Claim 4
Dependent Claim
34 words
A toner composition as claimed in claim 1 in which said polyester-forming polyol is selected from the group consisting of ethyleneglycol, diethyleneglycol, triethyleneglycol, 1,2-propanediol, 1,4-butanediol, neopentylglycol, 1,4-bis(hydroxymethyl) cyclohexane, polyoxyalkylene bisphenol A, glycerine and pentaerythritol.
Claim 5
Dependent Claim
46 words
A process for developing electrostatic latent images which comprises imparting a negative charge to a toner composition as claimed in claim 1 and then applying the toner composition to a copy substrate bearing a positive electrostatic latent image in order to render said latent image visible.
Claim 6
Dependent Claim
57 words
A toner composition as claimed in claim 1, in the form of particles having a size of from 5 to 20 microns, admixed with a substance selected from the group consisting of iron powder and glass beads, the amount of said substance being sufficient to impart a strong and uniform positive electric charge to said toner particles.
Claim 7
Dependent Claim
34 words
A toner composition as claimed in claim 1, in the form of particles having a size of 5 to 20 microns, blended in an insulating organic carrier liquid to form an electrophotographic developer liquid.
Claim 8
Dependent Claim
28 words
A toner composition as claimed in claim 5, containing from 10 to 100 parts by weight of said substance, per one part by weight of said toner composition.
Claim 9
Dependent Claim
16 words
A toner composition as claimed in claim 1, which is charged with a negative electric charge.
Claim 10
Dependent Claim
35 words
A toner composition as claimed in claim 1, containing from 3 to 10 parts by weight of said colorant, and said colorant is a pigment or dye or mixture thereof, for developing electrostatic latent images.
Claim 11
Dependent Claim
16 words
A toner composition as claimed in claim 7, which is charged with a negative electric charge.
Claim 12
Dependent Claim
13 words
A toner composition as claimed in claim 1, in which R is propylene.
References Cited (Backward Citations)
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US3544656A
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Cited
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |