US3985664A
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 and capable of being charged with a positive electric charge, which comprises 1 to 20 parts by weight of a colorant and 80 to 99 parts by weight of a resin, characterized in that said resin consists essentially of A. from 55 to 100 percent by weight of polyester resin which has a softening point of 80° to 130°C. measured in accordance with ASTM-E28-51T (ring and ball method), which has a nitrogen content of from 0.3 to 1.5 percent by weight, based on the total weight thereof, and 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 and succinic acid; with 2. a polyol component containing 10 mol percent or more of a glycol having the formula ##EQU1## wherein R 1 , R 2 and R 3 , which can be the same or different, each is hydrogen or alkyl having 1 to 4 carbon atoms, And B. the balance of said resin, i.e., 0 to 45 percent by weight of said resin, is a resin which has a softening point of 80° to 150°C. and is selected from the group consisting of polystyrene, rosin maleate, petroleum resin and epoxy resin.
Inventors
- 👤 Kahei Sakaguchi
- 👤 Hirotaka Takemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:50
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08775; C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08L; C08L67/00; G03G9/08742; G03G9/08755; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
244 words
A toner composition capable of being charged with a positive 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 80° to 130°C. and a nitrogen content of from 0.3 to 1.5 percent by weight, based on the total weight of said polyester resin, said polyester 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 ##EQU2## wherein R 1 , R 2 and R 3 , which can be the same or different, are hydrogen or unsubstituted alkyl having one to 4 carbon atoms, 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
244 words
A toner composition capable of being charged with a positive 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 80° to 130°C. and a nitrogen content of from 0.3 to 1.5 percent by weight, based on the total weight of said polyester resin, said polyester 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 ##EQU2## wherein R 1 , R 2 and R 3 , which can be the same or different, are hydrogen or unsubstituted alkyl having one to 4 carbon atoms, 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
41 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, hydrogenated bisphenol A, polyoxyalkylene bisphenol A, polyoxyalkylene hydrogenated bisphenol A, glycerine and pentaerythritol.
Claim 5
Dependent Claim
46 words
A process for developing electrostatic latent images which comprises imparting a positive charge to a toner composition as claimed in Claim 1 and then applying the toner composition to a copy substrate bearing a negative 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
27 words
A 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 positive 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 positive electric charge.
References Cited (Backward Citations)
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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 |