Claims
- 1. 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 .mu.m 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.degree. 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.
- 2. A process for producing a color toner as claimed in claim 4, wherein the time of kneading is at least 30 minutes.
- 3. A process for producing a color toner as claimed in claim 1, wherein the kneading is carried out at a temperature of from 100.degree. to 110.degree. C. for 50 to 200 minutes.
- 4. A color toner produced by the process of claim 1.
- 5. The color toner of claim 4, wherein the proportion of dispersed pigment particles having a circle-equivalent diameter of 0.3 .mu.m or greater does not exceed 0.1% of the total said dispersed pigment particles.
- 6. 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.gtoreq.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.
- 7. The color toner of claim 4, wherein said color toner has a particle diameter of not more than 9 .mu.m and has a pigment content ranging from 2 to 5.5 parts by weight per 100 parts by weight of the binder resin.
- 8. 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.
- 9. 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 .mu.m 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.degree. 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.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-146251 |
Jun 1990 |
JPX |
|
3-137049 |
May 1991 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/882,002 filed May 13, 1992, now abandoned, which is a continuation-in-part of application Ser. No. 07/710,620, filed Jun. 5, 1991, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4865937 |
Santilli et al. |
Sep 1989 |
|
5262268 |
Bertrand et al. |
Nov 1993 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
62-127847 |
Jun 1987 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
882002 |
May 1992 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
710620 |
Jun 1991 |
|