US5529871A
Expired / Lapsed
US
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Color toner and process for producing the same
Assignee: Fujifilm Business Innovation Corp
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Filing: 1994-07-18
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Granted: 1996-06-25
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Expires: 2014-07-18
Abstract
Abstract A color toner providing a toner image excellent in brightness, clearness and graininess and a process for producing the same are disclosed, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total number of said dispersed pigment particles. The process comprises kneading a water-containing pigment paste and a binder resin at a temperature of 100° C. or higher under pressure in a heat and pressure kneader to remove a water content to obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.
Inventors
- 👤 Masanori Ichimura
- 👤 Hiroshi Takayama
- 👤 Michio Take
- 👤 Hideyuki Akagi
- 👤 Takashi Imai
- 👤 Satoshi Inoue
- 👤 Yasuo Yamamoto
- 👤 Yutaka Sugizaki
- 👤 Koji Fukushima
- 👤 Masayuki Takei
- 👤 Masaru Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/0802; G03G9/0804; G03G9/081; G03G9/09; G03G9/0906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
A process for producing a color toner comprising a binder resin having dispersed therein pigment particles, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total number of said dispersed pigment particles, the process comprising kneading a water-containing pigment paste and a binder resin at a temperature of 100° C. or higher under pressure in a heat kneader to remove a water content to obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.
Claim 2
Dependent Claim
95 words
A process for producing a color toner comprising a binder resin having dispersed therein pigment particles, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total number of said dispersed pigment particles, the process comprising kneading a water-containing pigment paste and a binder resin at a temperature of 100° C. or higher under pressure in a heat kneader to remove a water content to obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.
Claim 3
Dependent Claim
22 words
A process for producing a color toner as claimed in claim 4, wherein the time of kneading is at least 30 minutes.
Claim 4
Dependent Claim
32 words
A process for producing a color toner as claimed in claim 1, wherein the kneading is carried out at a temperature of from 100° to 110° C. for 50 to 200 minutes.
Claim 5
Dependent Claim
10 words
A color toner produced by the process of claim 1.
Claim 6
Dependent Claim
33 words
The color toner of claim 4, wherein the proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total said dispersed pigment particles.
Claim 7
Dependent Claim
64 words
The color toner of claim 4, wherein said color toner has a pigment content ranging from 2 to 8 parts by weight per 100 parts by weight of the binder resin and has an absorbance satisfying formula: A≧0.3B+0.1 wherein A is an absorbance; and B is a number of parts by weight of the pigment per 100 parts by weight of the binder resin.
Claim 8
Dependent Claim
42 words
The color toner of claim 4, wherein said color toner has a particle diameter of not more than 9 μm and has a pigment content ranging from 2 to 5.5 parts by weight per 100 parts by weight of the binder resin.
Claim 9
Dependent Claim
50 words
The color toner of claim 1, wherein the pigment particles are selected from the group consisting of C.I. Pigment Red 48:1, C.I. Pigment Red 122, C.I. Pigment Red 57:1, C.I. Pigment Yellow 97, C.I. Pigment Yellow 12, C.I. Pigment Yellow 17, C.I. Pigment Blue 15:1, and C.I. Pigment Blue 15:3.
Claim 10
Dependent Claim
100 words
A process for producing a color toner comprising a binder resin having dispersed therein pigment particles, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total number of said dispersed pigment particles, the process comprising kneading a paste consisting essentially of pigment particles and water, and a binder resin at a temperature of 100° C. or higher under pressure in a heat kneader to remove a water content and obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.
Claim 11
Dependent Claim
100 words
A process for producing a color toner comprising a binder resin having dispersed therein pigment particles, wherein a proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 μm or greater does not exceed 0.1% of the total number of said dispersed pigment particles, the process comprising kneading a paste consisting essentially of pigment particles and water, and a binder resin at a temperature of 100° C. or higher under pressure in a heat kneader to remove a water content and obtain a pigment dispersion, melt-kneading the resulting pigment dispersion together with a binder resin, and grinding the mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-25 | 1999-12-25 | 2000-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-25 | 2003-12-25 | 2004-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-25 | 2007-12-25 | 2008-06-25 | $7700.00 | Window Closed / Lapsed |