Claims
- 1. A toner for forming a developer medium which is capable of reacting with a chromogenic material to produce a visible dye image, comprising:
- developer particles each including a developer material capable of reacting with said chromogenic material; and
- thermoplastic resin particles having a smaller grain size than said developer particles, each of said developer particles carrying a multiplicity of said thermoplastic resin particles deposited on a surface thereof.
- 2. A toner for forming a developer medium according to claim 1, wherein said thermoplastic resin particles consist of polymethyl methacrylate.
- 3. A toner for forming a developer medium according to claim 1, wherein a ratio of an average grain size of said thermoplastic resin particles to that of said developer particles ranges from 1/5 to 1/50.
- 4. A toner for forming a developer medium according to claim 3, wherein said average grain size of said thermoplastic resin particles ranges from 0.05 to 5 microns.
- 5. A toner for forming a developer medium according to claim 4, wherein said average grain size of said thermoplastic resin particles ranges from 0.15 to 0.4 micron.
- 6. A toner for forming a developer medium according to claim 1, wherein each of said developer particles comprises said developer material, and a binder for coagulating said developer material into a coherent mass.
- 7. A toner for forming a developer medium according to claim 6, wherein said developer material comprises at least one material selected from the group consisting of:
- mineral clays selected from the group including acid earth, active clay and attapulgite;
- organic acids selected from the group including tannic acid and gallic acid;
- esters selected from the group including propyl gallic acid ester;
- acidic polymers selected from the group including phenol-formaldehyde resins, phenol-acetylene condensation polymer resins, condensation polymers of carboxylic acid having at least one hydroxy radical and formaldehyde;
- metal salts of aromatic carboxylic acids selected from the group including zinc salicylates, tin salicylates, zinc 2-hydroxynaphthoic acid, zinc 3,5-di-tert-butyl salicylic acid, and zinc .alpha.-methylbenzyl salicylic acid;
- oil-soluble metal salts of phenol-formaldehyde novolak resin modified by zinc; and
- zinc carbonate.
- 8. A toner for forming a developer medium according to claim 6, wherein said binder comprises at least one material selected from the group consisting of: polystyrenes and/or copolymers thereof; polyesters and/or copolymers thereof; expoxy, acrylate, methacrylate, and/or copolymers thereof; silicone resins; polypropylenes and/or copolymers thereof; waxes; fluorine-contained resins; polyamides; polyvinyl alcohol; polyurethane; polyurea; and phenolic resins.
- 9. A toner for forming a developer medium according to claim 1, wherein said developer particles are formed by dispersing or dissolving said developer material in a solvent, and spraying said solvent by a spray drier.
- 10. A toner for forming a developer medium according to claim 11, wherein said developer particles are formed by heating a mixture of said developer material and said binder so as to produce a melt of said mixture, solidifying said melt into a solid mass, and milling said solid mass.
- 11. A toner for forming a developer medium according to claim 1, wherein said thermoplastic resin particles are mixed with said developer particles by a mixer, such that said thermoplastic resin particles are deposited on the surface of said each developer particle.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-332488 |
Dec 1988 |
JPX |
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Parent Case Info
This application is a continuation-in-part of application Ser. No. 07/159,736, filed Feb. 24, 1988.
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4307165 |
Blazey et al. |
Dec 1981 |
|
4399209 |
Sanders et al. |
Aug 1983 |
|
4440846 |
Sanders et al. |
Apr 1984 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
159736 |
Feb 1988 |
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