JPS6156357A - Microencapsulated toner - Google Patents

Abstract

PURPOSE:To improve the pressure fixability of a microencapsulated toner and to prevent offset to a pressing roller by graft-polymerizing a vinyl monomer on liq. polybutadiene or the like and incorporating the resulting polymer into the core material. CONSTITUTION:A vinyl monomer such as lauryl methacrylate is graftpolymerized on a stock polymer such as liq. polybutadiene, a styrenebutadiene copolymer or unsatd. polyester. During the polymn., a colorant is added, or magnetic powder of magnetite or the like is further added as required. The resulting polymer is incorporated into a core material, and this core material is coated with a hard resin for outer walls such as epoxy resin, epoxy-urea resin or polyurethane resin to obtain a capsulated toner. Since the core material contains the grafted vinyl resin, the offset resistance and pressure fixability of the tober can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a toner for energy-saving image development.
More specifically, the present invention relates to a microcapsule type toner which is preferably used as a pressure fixing type toner.

[Conventional technology]

In recent years, electrophotographic methods, electrostatic printing methods, electrostatic recording methods, etc. are used to form an electrostatic image based on image j+', and this is developed with a developer toner to form a toner image. 2. Description of the Related Art It is widely used to form a visible image by transferring a toner image onto a transfer paper or the like and then fixing it.

Conventionally, toner for electrostatic image development has been widely used as a powdered toner obtained by finely pulverizing a mixture of thermoplastic resin and a coloring agent such as carbon blank dispersed therein. If it is a two-component toner, it is mixed and stirred with a carrier such as iron powder or glass beads, or if it is a one-component toner containing fine magnetic powder, it is stirred by itself. As a result, the toner image is triboelectrically charged, the electrostatic force is used to develop an electrostatic image, and the resulting toner image is transferred, for example, and then heated and fixed using a heating roller or the like. However, in such toners, toner particles are crushed during agitation for frictional charging and fine powder toner is generated, resulting in poor visible image quality or the need to replace the toner with new ones early. Not only is it necessary to heat the fuser, but it also requires a long waiting time for the temperature of the fuser to reach the desired setting temperature, and since the fixing is done using a heat fixing method, This requires a large amount of energy, and can also cause a fire if a paper jam occurs.However, in order to achieve effective fusing, extremely strict conditions such as temperature conditions must be met. is necessary.

Under such circumstances, a method of fixing using pressure has been proposed. That is, a pressure fixing method has been proposed in which toner particles are fixed to an image forming support by applying pressure to the toner, and for example, the method described in U.S. Pat. ing. Since this method does not require the use of heat or solvent, it has the advantage that it does not cause any problems, does not require warm-up time, and requires less energy for fixing.

However, the above-mentioned pressure fixing method has poor fixing properties compared to fixing methods using heat, etc., and may peel off or sag when rubbed, and requires high pressure. The paper had some drawbacks, such as the paper becoming weak and the surface of the copy paper having an excessive gloss.

In order to solve this drawback, research has recently been carried out on the use of so-called microcapsules as toner for zero-electrode development. This microcapsule type toner is a powder type toner in which a liquid substance exhibiting pressure fixability, or at least a soft solid substance, and a colorant are enclosed as a core material in fine particle resin capsules.

This microcapsule type toner can contain sticky soft solids, etc. within the core, so it has better powder properties and can be fixed at low pressure compared to conventional pressure fixing toners made of a single υ1 fat. Condensation occurs during toner manufacturing or storage.
5. Advantages such as no blocking etc. are expected.

[Conventional disadvantages]

This kind of pressure-fixable microcapsule toner was invented in Japanese Patent Application Laid-open Nos. 51-91724 and 52-1199.
No. 37, No. 54-118249 and No. 55-6425
The technique described in No. 1 Specification Publication and the like is known. However, in the above technology, during the offset phenomenon to the pressure row 2-, 8A, A5.6.1 In order to make the microphone T:I capsule type toner that does not cause the offset phenomenon, the core material must be It is preferable to use a polymer with a molecular weight as high as possible. However, a polymer with a high molecular weight naturally has a problem of poor pressure fixing properties.

[Purpose of the invention]

An object of the present invention is to provide a microcapsule type toner that does not cause an offset phenomenon to a pressure roller and has good pressure fixability.

[Invention of invention]

The above object of the present invention is achieved by a microcapsule type toner having a core material and an outer wall of a reservoir covering the core material, which is characterized in that the core material includes a vinyl magnetic layer grafted onto the core material. Ta.

It is well known that vinyl resin grafted onto polybutanoene or unsaturated polyester is used in hot roll fixing systems to prevent offset to the roller. (For example, Japanese Patent Application Laid-Open No. 59-45448, etc.) When this resin was used as a core material of a microcapsule type toner,
It was unexpected that not only the offset resistance to pressure row 2- was improved, but also the pressure fixing property was improved over that of the non-grafted resin. Although it is not clear why not only the offset resistance but also the fixing performance has improved, the authors think as follows. In the case of capsule toner, unlike ordinary electrophotographic toner, in addition to fine powder of colorant (carbon black, magnetic powder, etc.), the outer wall of the broken capsule must be strongly adhered to paper during fixing.

In this case, if a part of the core material contains a grafted resin with higher viscosity and elasticity, it will adhere more strongly to the paper.
The 41η configuration of the present invention will be explained in detail.

The method for producing the microcapsule type toner of the present invention can utilize various known encapsulation techniques. methods in which components in a dispersion medium undergo a polymerization reaction to form a resin film), coacelvage run method, in siLugl method, phase separation method, etc., U.S. Patent No. 3,338.991, U.S. Pat.
The methods described in the specifications of No. 848 and No. 3,502.582 can be used. Among them, interfacial polymerization method can be used effectively. This is because the outer wall is easy to form and the core material and wall material can be easily separated.

In addition, the outer wall material forming the microcapsule type toner (a) is not particularly limited, but epoxy resin is preferably used.
Epoxy 01 Jiff or oil produced by the reaction between a compound containing an epoxy group and a hardening agent. Examples of these epoxy resins or compounds containing epoxy groups include the following, but are not particularly limited as long as they have two or more epoxy groups in the molecule.

A-1) and X 7
5J.

"Epicoot 819" 汀Epihoot 828J.

"Epicoat 834" (manufactured by Yuka Shell Epoxy Co., Ltd.) A-2) Resorcinol type epoxy resin n = 9WL of not less than o A-3) Bis7 El/F type epoxy resin n = Integer 8-4 of not less than o ) Tetrahydroxyphenylethane type Evokin Ku4 fat Commercial product name 2 "Epicote 1031J (manufactured by Yuka Shell Epoxy Co., Ltd.) A-5) Novolac type epoxy resin C112CH2C1+2 n = 0.1.2.3 or 4 Commercial product name: "2 pico) 152J
(manufactured by Yuka NEL Epokin Co., Ltd.) A-6) Polyalcohol, polyglyfur type epoxy resin (R=) I, C) represents 11 groups or C112CIh group, n represents an integer of 0 or more,) A-7) Glycerin Triether type epoxy product Commercial product name: "Ebiko" 812J (manufactured by Yuka Shell Epoxy Co., Ltd.) A-8) Polyolefin type epoxy resin -9) Epoxidized soybean oil A -101 Epoxidized linseed oil Commercial product name: [ADEKASIZER 〇 -180A J (7
(manufactured by Deka Earth Chemical Co., Ltd.) A-11) Halogenated bisphenol type epoxy resin
r Epifuto 1050J (manufactured by Yuka Shell Epokin Co., Ltd.) A-12) Vinyl cyclohexene dioxide A
-13) Dicyclopentadiene oxide A-14)
3.4-Epoxy-6-methylcyclohexylmethyl-3,4-epoxy-〇-methylcyclohexane carbonate Examples of commercially available products include “Epicote 807J.

[Epicote 827J.

[Epicote 190J.

[Epicote YX-310J.

[Epicote DX-255J (Manufactured by Yuka Shell Epoxy Co., Ltd.) i etc. are mentioned.

The curing agents include ethylenediamine, diethylenetriamine, triethylenetriamine, tetraethylenepentamine, hexamethylenediamine, iminobispropylamine, other aliphatic polyamine compounds, xylylene diamine, phenylenediamine, and other aromatic polyamine compounds. is representative, and commercially available products include 5, Ebicure T1, Epicure U, and Epicure 103.
, Evomate B-001, Evomate LX-I N, Epomate PX-3 (manufactured by Yuka Shell Epoxy Co., Ltd.), and other generally known epoxy curing agents.

As the polyamide resin, so-called polyamide resins obtained by the reaction of carboxylic acid compounds such as sebacic acid chloride, terephthalic acid chloride, and adipic acid chloride with aliphatic polyamines and aromatic polyamines exemplified as curing agents for the above-mentioned epoxy resins are used. Can be used.

Polyurethane resins are obtained by reacting polyinocyanates with polyols, and polyurethane resins are obtained by reacting polyisocyanates with polyamines. Specific examples of polyisocyanates include the following.

B-1) Hexamethylene diisocyanate OCN
(CHz) sN CO Commercial product name: "Desmono Ale H" (manufactured by Sumitomo Bayer Urethane Company) B-2) Hexamethylene diisocyanate adduct CONIICM) II□-NGO 0CN Ca1Lz N C0NtlCsl11r -NCO Commercial product name: "Des Monoale N" (Manufactured by Suminen Bayer Urethane Sango Co., Ltd.) B-3) Metaphenylene diisocyanate GO Commercial product name = "Su7 Conate" (Nanyonalaniline Co., Ltd. Jl() B-4)) Ruyrene Isocyanate Commercial product name: [Sumine ) 80J (manufactured by Sumima Kagaku Kogyo Co., Ltd.) “Hiren TMJ
(Dupont 51) rT DI 80/21J, rT DI 65
/35J (manufactured by Mitsui Nisso Urethane Co., Ltd.) B-5) 2.4-) Rylene diincyanate Commercial product name: "Sumidur T" ), B-6)) Reaction product of lylene isocyanate and trimethylolpropane Commercial product name: "Suminoyur L" (manufactured by Sumino Bayer Urethane Co., Ltd.) "Coronate L" (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) B-7) 3.3'-nomethylnophenyl 414
'-Noisocyanate Commercial product name: "Hiren■(" (Dupont Co., Ltd.)
JB-8) Nophenylmethane-4,4-noisocyanate Commercial product name = r millione) MTJ (manufactured by Nippon Polyurethane Kogyo Co., Ltd.) [Isonate 125MJ (manufactured by Kasei Upnoshine Co., Ltd.) "Suminate M" (Suminate M) (manufactured by Sumima Kagaku Kogyo Co., Ltd.) B-9) 3.3'-Nomethylnophenylmethane
4,4'-diincyanate Commercial product name: "No1ylene DMMJ (manufactured by DuPont) B-10)) Riphenylmethane-triisocyanate CO Commercial product name: "Desmono Ale R" (manufactured by Bayer Urethane-1i4) B-11)
Polymethylene phenyl isocyanate Commercial product name: [Millionate MRJ "Manufactured by Nippon Polyurethane Kogyo Co., Ltd.""Suminoyur 44V-104 (Manufactured by Jujube Bayer Urethane I-Sata Co., Ltd.) rI'AI'+ 135J P8I'! 20J (
(Manufactured by Kasei Upjohn Co., Ltd.) B-12) Su7talene-1.5 Noincyanate NGO Commercial product name: "Sumidur 15" (Manufactured by Jujube Bayer Urethane Taobi Co., Ltd.) B-13) Nocyclohexylmethane diisocyanate Commercial product name: [Des Module WJ (manufactured by Rawhide Bayer Urethane Kogyo Co., Ltd.) B-14) Diphenyl ether-4,4-diisocyanate Commercial product name: "Suminate E" (manufactured by Suminate Kagaku Kogyo Co., Ltd.) Polyurethane resin reacts with the above polyisocyanates to produce r? L < is polyurea (ρ) (Specific examples of polyols or polyamines that quickly detect fat include the following.

C-1) Polyols such as ethylene glycol, propylene glycol, and hexamethylene glycol, triols such as glycerin, trimethylolpropane, trimethylolethane, and 1,2,6-hexanetriol, pentaerythritol, and water, etc. .

C-2) Polyamine ethylene? Amine, hexamethylenezamine, noethylenetriamine, iminobi-containing propylene, sulfuramine, phenylenenoamine, quintylenezamine, triethylenetetramine, and others.

The core material mainly consists of a graft polymer, a colorant, and other additives.

Double bonds are used as the backbone polymer of graft copolymers.
[A polymer having a molecule i of 1000 or more and having a plurality of polymers, such as liquid polybutanoene, styrene-butadiene copolymer, unsaturated polyester, etc.

The above unsaturated polyester can be suitably obtained by condensing a mixed system of an unsaturated dibasic acid and another polybasic acid, preferably a saturated polybasic acid, with a polyhydric alcohol.

Examples of the heterocyclic dibasic acids include maleic acid, hexamaric acid, citraconic acid, itaconic acid, and others, which may be used alone or in combination. Specific examples of saturated polybasic acids include heptalic acid, succinic acid, heptanobinic acid, azelaic acid, and sebacic acid.

Specific examples of polyhydric alcohols include ethylene glyfur, propylene glycol, 1.4-7'tanol, 1.3-butanol, neopentyl glycol, water-based polyoxypropylene, suphenol A, glycerin, etc. can be mentioned.

Graft polymers can be obtained by lanocal polymerization of vinyl monomers in the presence of these backbone polymers. The ratio of the backbone polymer to the vinyl monomer is not particularly limited, but is usually 0.01-10%, preferably 0.05-5%.

Examples of the vinyl monomer grafted onto the backbone polymer include styrene, p-methylstyrene, p-tert-
7'tylstyrene, p-7toquinstyrene, p-phenylstyrene, 3,4-nochlorokylene, methyl acrylate, ethyl acrylate, inbutyl acrylate, inbutyl acrylate, propyl acrylate, n acrylate
-octyl, dodecyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, ethyl methacrylate,
These include propyl methacrylate, 11-butyl methacrylate, inbutyl methacrylate, 521]-octyl methacrylate, dodecyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, stearyl methacrylate, phenyl methacrylate, etc.

4) Alternative polymerization ()1 additives used in the present invention include, for example, benzoyl group-oxide, lauroyl peroxide, and peroxides such as azobisisobutyronitrile and azobisvaleronitrile. Agents can be mentioned.

Further, in order to adjust the degree of polymerization, a small amount of a substance that causes chain transfer and polymerization inhibition, such as α-methylstyrene and dodenlumerbutane, may be added.

Also, in addition to resin, one of the core materials may contain a plasticizer such as dibutyl 7-thalerate, trifrenol phosphate, soybean oil, paraffin wax, silicone oil, etc. that exhibits a template effect (with a pressure roller). good.

In addition, the core material preferably contains a colorant, but in order to obtain a microcapsule toner suitable as a magnetic toner used as a one-component toner, part or all of the colorant may be added. A fine powder of a magnetic substance is contained as a powder.

As a coloring agent, carbon black, Nigrosin' Jr.
S I) (C,1,No,504151]), Aniline Blue (C,1,ilo.

50405), Rose Bengal (C, l, No. 454)
35), mixtures thereof, and others.

The magnetic material may be a ferromagnetic metal or alloy such as 7-elite, magnetite, iron, cobalt, or nickel, or a compound containing these elements, or a material that does not contain a ferromagnetic element but is subjected to appropriate heat treatment. Alloys that become ferromagnetic due to the presence of manganese, such as manganese-aluminum, alloys called Heusler alloys containing manganese and i, such as manganese-copper-tin, chromium dioxide, and others. I can do it.

Specifically, as magnetite, EPT-1000,
EPT-500, MRMB-450 (manufactured by Toda Kogyo Co., Ltd.), [1L-5ZO1IIL-5P, Rtl-BL
, B-20 (manufactured by Titanium Kogyo Co., Ltd.), etc. are preferably used.

The mixing ratio of each constituent material of the microcapsule type toner of the present invention is preferably as shown in the table below.

(11t% of the total toner) Ingredients 5-40 10-75 20-7
0 0~20lJ Synthetic component 5~60 10~90
In the case of 0 to 20, it is preferable in the present invention to use epoxyurea resin or epoxyurethane resin as the outer wall. An example of a production method preferably used in this case is the dog street.

[1] The polyvalent incyanate compound, the epoxy group-containing compound, the vinyl monomer, the polymerization initiator, and the colorant are mixed uniformly, and then the mixture is dispersed to an appropriate level to stabilize the dispersion. 41! etc., the compound described above is divided into fine particles and suspended in fractions, and in this form 2, the compound is first encapsulated in monomer form with epoxyurea or epoxyurethane resin, and then polymerized and stirred until the polymerization is completed. Continue. Thereafter, the solid matter is filtered off and dried to produce a microcapsule type toner.

Examples of dispersion stabilizers include water-soluble polymer substances such as gelatin, gelatin ig form, polyvinyl furfur, polystyrene sulfonic acid, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, and polyacrylic acid, Anionic surfactants 1, nonionic surfactants, cationic surfactants, colloidal silica, alumina, tricalcium phosphate, ferric hydroxide, titanium hydroxide, aluminum hydroxide For hydrophilic inorganic colloid substances such as, etc. can be effectively used. Of course, two or more of these dispersion stabilizers may be used in combination, and appropriate auxiliary agents may also be used together.

Although the particle size of the microcapsule type toner according to the present invention is not particularly limited, the average particle size is 5 to 50 μm.
lfl, preferably 5 to 30μ'n.

Further, the thickness of the outer wall and the particle size of the core material may be the same as in the case of conventional microcapsule type toner.

When the microcapsule type toner of the present invention contains magnetic fine powder, it can be used alone as a developer, and when it does not contain magnetic fine powder, it can be mixed with a carrier to form a two-component system. The developer can be used as ill 5ff.

The toner of the present invention is easily torn by a pressure roller with a linear pressure of, for example, 10 to 30KH/c+n, although this varies depending on the quality of its outer wall, particle size, etc. With this structure, the toner image made of the toner can be easily fixed onto a supporting paper, for example, a transfer paper. Further, auxiliary heating may be performed at that time.

〔Example〕

Examples of the present invention will be described below, but the embodiments of the present invention are not limited to these.

Example 1 Polybutanoene [
G-3000J (0.2g manufactured by Nikhe Soda Co., Ltd., dodecyl mercaptan 0.02g, azobis(2,4-trimethylvaleronitrile) 2.4g, phosphate ester surfactant, rTOP-OJ (Nikko Chemicals Co., Ltd. 419) )0.0
2g of magnetic powder rBL-520J (particle size 0
226μ, manufactured by Titan Kogyo Co., Ltd.) was added thereto, and the mixture was thoroughly mixed. Add this mixture to 10% carunium phosphate 18
A surfactant [Nure/Kusu RJ (manufactured by NOF Corporation) 0.158 was added to 00mQ and dispersed using a homonizer.

An aqueous solution of hexamethylenezamine 158 dissolved in this 50. Q was added dropwise to create a polyurea outer wall.

Thereafter, lauryl methacrylate was polymerized by heating at 60 to 65° C. for 6 hours while stirring. next
i 10 to 20 Q of hydrochloric acid was added to this solution to decompose the dispersion stabilizer, calcium monophosphate. After decomposition, the solution was filtered to obtain a microcapsule type toner. This toner was developed using U-B 1xtzoo (manufactured by Konishiroku Photo Industry Co., Ltd.) and fixed using a pressure roller with a pressure of 20 KB/cm. There was no offset to the pressure roller, and a good fixed image was obtained in finger rubbing test F.

Example 2 [Synthesis of unsaturated polyester] Polyoxypropylene-2,2'-bis(4-hydrocarbon) was placed in a 311-capacity four-bottle flask equipped with a thermometer, agitation, and a gas inlet tube and an armpit-type condenser. quinphenyl)
Propane 344g < 1 mol), 116-hexaneol 236. (2 mol), neopentyl glycol 20
After introducing nitrogen gas from the gas inlet tube to create an inert atmosphere inside, the temperature was maintained at 50°C and maleic anhydride 196E (2 mol) and succinic anhydride 1I were added.
2100B (2 mol), isophthalic acid 163g (0,9
The reaction was carried out at 180-200°C for 6 hours with the addition of 8 mol). Water generated as the reaction progressed was trapped and removed by a condenser. Thereafter, the gas introduction tube and condenser were removed, a vacuum line was connected, and while water was removed under reduced pressure, the reaction was further carried out at 200°C for 6 hours to produce an unsaturated polyester.

[Synthesis of capsule toner]

60g of vinyl JIL ffi body, 1.5B of the above unsaturated polyester, 2.0g of azobisisobutylene)nitrile
, Phosphate ester surfactant "TOP-OJ (Nikko Chemicals Co., Ltd. 1) 0.20g, Polyincyaner)"s
BU 1socya-naLe 0389J (Jinju Bayer Urethane Co., Ltd.'Jl) 27 g, epoxy compound "Epicote 819J (manufactured by Axial Simulki'ton Co., Ltd.) 10 g, butyl 7 tallate 5 g, magnetic powder rBL-120" (manufactured by Titan Kogyo Co., Ltd.) 90 g was added and mixed well by stirring. This product was added to a 10% calcium phosphate suspension 800- along with 0.12 g of a surfactant 221-X R (manufactured by NOF Corporation) and well dispersed using a homonizer.

Then, 50 mQ of an aqueous solution in which 1eFi was dissolved was added dropwise. The temperature was then raised to 60°C, the reaction was continued at the same temperature for 6 hours, and the reaction was further heated at 80°C for 8 hours to complete the reaction. After coating, add hydrochloric acid and apply molding agent (i3 n')
Introducing i8, wash it with water, and use microcapsule toner.

This toner was developed using U-Bix 1200 (manufactured by Konishiroku Photo Industry Co., Ltd.) and fixed using a pressure roller with a pressure of 20 kg/am. There was no offset to the pressure roller, and a good fixed image was obtained in the finger rubbing test.

Example 3 60 g of lauryl (tacryl), 1.5 g of unsaturated polyester (same as used in Example 2), α-7
Thirstyrene 0.5E, 2.4 g of azobis(2,4-trimethylvaleronitrile), and 90 g of phosphate ester interfacial magnetic powder rBL-520J (manufactured by Titan Kogyo Co., Ltd.) were added and polymerized well.

This dispersion was added to a 10% calcium phosphate suspension with a surfactant [Newrenx RJ (manufactured by NOF Corporation) 0.
．． 15B: Dispersed using a Kokan homogenizer.

To this, 50 mQ of an aqueous solution of neopentylglyfur 15E was added dropwise, and then 1ff1 reaction was carried out at 60°C for 6 hours. Furthermore, 10 g of Hekimetori Lenzum 7 min was dissolved, 1 liter of water (solution 30.Q) was added, and the mixture was heated for 4 hours.

After cooling, 10 to 20 ml of hydrochloric acid was added to the solution to dissolve calcium phosphate as a dispersion stabilizer, and after dissolution, the solution was filtered to obtain a microcapsule type toner. Apply this toner to U-B.
ix 1200 (S! Roku Konishi Photo Industry Co., Ltd.) was used to develop the image, and it was passed through a pressure roller with a pressure of 20 KH/c++ at a constant 2°f. There was no offset to the pressure roller, and the retest by finger rubbing showed good results. A fixed image was obtained.

Example 1 except for “Comparative Example Polybutanoene rG-3000”
A microcapsule type toner was obtained in the same manner as above.

This product was tested with U-Bix 1200 (manufactured by Konishiroku Photo Industry Co., Ltd.) and fixed using a pressure roller of 20 kg/am.

Offset to the pressure roller is visible and finger rubbing
My fingers got dirty during the first stroke.

Evaluation of fixing properties Apart from the qualitative evaluation of fixing properties by finger rubbing, quantitative evaluation of fixing properties was carried out as follows.

Solid black part of the sample fixed on paper (radiation density = 1.0
), dyeing material r% seeding waxiness test Tsuki A-301
0 (Daieika Seimitsu Seisakusho), 'R5' so that the load becomes 2KH, and
55 grade 4 (manufactured by Konishiroku Photo Industry Co., Ltd.) five times, and the change in the degree of reflection (residual rate) was evaluated in percentage. The results are shown in the table below.

As described above, the fixing properties of the microcapsule type toner of the present invention are good.

〔Effect of the invention〕

As is clear from the above examples, according to the present invention, a microcapsule type toner having excellent offset resistance and pressure fixing properties can be provided.

Claims (1)

[Claims] A microcapsule type toner comprising a core material and an outer wall covering the core material, the microcapsule type toner comprising a vinyl resin grafted to the core material.