KR20100012249A - Method for preparing latex - Google Patents

Abstract

PURPOSE: A method for preparing latex is provided to reduce manufacturing costs, to simplify a manufacturing process, and to prevent physical property change using a water-dispersed hydroxypropylmethyl cellulosephthalate. CONSTITUTION: A method for preparing latex comprises the steps of: (a) preparing an emulsifier solution including a water-dispersed hydroxypropylmethyl cellulosephthalate; and (b) adding at least one monomer in the emulsifier solution, and then polymerizing the mixture. The water-dispersed hydroxypropylmethyl cellulosephthalate is prepared by emulsifying, neutralizing, and dispersing the hydroxypropylmethyl cellulosephthalate with water.

Description

Method for preparing latex {Method for preparing latex}

The present invention relates to a method for preparing latex, and more particularly, by using an aqueous dispersion hydroxypropylmethyl cellulose phthalate, which can simultaneously serve as a surfactant and a coagulation medium, it is possible to reduce the manufacturing cost and to prevent changes in physical properties. It relates to a method for producing a latex.

In general, surfactants are used in the production of latex (ie, emulsions) to stabilize particles and produce smaller nano (nm) sized particles. Such surfactants are used in almost all latexes such as latex for PSA, latex for toner, latex for other floor polishes, and water-soluble ink latex.

In addition, such surfactants are classified into anionic surfactants, nonionic surfactants, and cationic surfactants, depending on their form. Among these, anionic and nonionic surfactants are mainly used. These surfactants are known to play only a role in influencing particle stabilization and miniaturization, but have no other function. That is, the surfactant does not affect the factors such as adhesion, cohesive behavior, glossiness, and affects only the stability of the resulting final particles.

In addition, recently, there is a tendency to use an excessive amount of surfactant in order to make the latex particles smaller, which is accompanied by various problems such as environmental pollution and waste water generation. For example, U. S. Patent No. 5,164, 444 uses an anionic surfactant (Alipal Co-433) and a nonionic surfactant (Igepal CO-887) in a mixture, the amount of the use is 10.28% by weight relative to the monomer is very excessive Do.

On the other hand, when a secondary process such as a flocculation step is performed using the latex prepared as described above, since the surfactant has a problem of destabilizing the fine particles in the secondary step, its use is limited. However, when the amount of the surfactant is reduced in this way, the stability of the final latex tends to be broken, and in some cases, the latex may be separated from each other and may not be used.

The secondary process using the latex described above may include a film manufacturing process using a latex in addition to the aggregation process. In particular, in the case of latex for toner production, a flocculation process is carried out in a secondary process, and the flocculation process is a step of growing nano-particles into microns-based macroparticles, which is a very important part in toner production. Specifically, this agglomeration process occurs due to the electrostatic crosslinking of carboxyl groups present in the latex particles, and monomers containing carboxyl groups have typically been used to introduce such electrostatic crosslinking portions into the latex particles. However, the monomer has a problem that shows a rapid growth of the latex particles in the flocculation process due to the high price and excessive use of the carboxyl acid is changed.

U.S. Pat.Nos. 7,160,661, 6,617,091, 6,447,974, and 6,120,967 disclose methods for preparing latex for toner production, and specifically, the method includes the use of a monomer containing a surfactant and a carboxyl group. .

It is an object of the present invention to provide a novel process for producing latex using aqueous dispersion hydroxypropylmethyl cellulose phthalate, which can simultaneously serve as a surfactant and a flocculating medium.

 Another object of the present invention is to provide a method for producing latex which can reduce the manufacturing cost and simplify the manufacturing process.

Still another object of the present invention is to provide a method for preparing latex, which can prevent a change in physical properties.

The present invention to solve the above problems,

(a) preparing an emulsifier solution comprising aqueous dispersion hydroxypropylmethyl cellulose phthalate; And

(b) it provides a method for producing a latex comprising the step of polymerization by adding at least one monomer to the emulsifier solution.

According to one embodiment of the invention, the aqueous dispersion hydroxypropylmethyl cellulose phthalate is prepared by emulsion neutralizing and dispersing hydroxypropylmethyl cellulose phthalate in water together with a neutralizing agent.

According to another embodiment of the present invention, the neutralizing agent is ammonia water, the amount of the use is 8 to 12% by weight relative to the weight of hydroxypropylmethyl cellulose phthalate.

According to another embodiment of the invention, the acid value of the aqueous dispersion hydroxypropylmethyl cellulose phthalate is 110 ~ 130mgKOH / g.

According to another embodiment of the present invention, the amount of the aqueous dispersion hydroxypropylmethyl cellulose phthalate is 1 to 80% by weight based on the total weight of the monomer.

In addition, the present invention to solve the above problems,

Provided is a method for preparing toner using latex prepared by the method of any of the above embodiments.

According to the present invention, a novel method for preparing latex using water-dispersible hydroxypropylmethyl cellulose phthalate, which can simultaneously serve as a surfactant and an aggregation medium, can be provided.

In addition, according to the present invention, there can be provided a method for producing latex that can reduce the manufacturing cost and simplify the manufacturing process.

In addition, according to the present invention, there can be provided a method for producing a latex that can prevent a change in physical properties.

Next, a method for producing a latex according to a preferred embodiment of the present invention and a method for producing a toner using the latex produced by the method will be described in detail.

Method for producing a latex according to an embodiment of the present invention, (a) preparing an emulsifier solution containing aqueous dispersion hydroxypropylmethyl cellulose phthalate and (b) adding at least one monomer to the emulsifier solution Polymerizing.

Hereinafter, a method of manufacturing latex according to the present embodiment will be described in more detail.

Preparation of Aqueous Dispersed Hydroxypropylmethyl Cellulose Phthalate

The aqueous dispersion hydroxypropylmethyl cellulose phthalate is prepared by emulsion neutralizing and dispersing hydroxypropylmethyl cellulose phthalate with water such as deionized water together with a neutralizing agent. In this case, hydroxypropylmethyl cellulose phthalate is mixed at a ratio of 5.0 to 50.0% by weight relative to the weight of water.

The neutralizing agent serves to dissolve the water-insoluble hydroxypropylmethyl cellulose phthalate in water, for example, ammonia water may be used, the amount is 8 to 12% by weight relative to the weight of hydroxypropylmethyl cellulose phthalate It is preferable that it is and it is more preferable that it is 9.5-11.0 weight%. If the amount is less than 8% by weight, there is a problem that hydroxypropylmethyl cellulose phthalate that is not dissolved in water remains, and when it exceeds 12% by weight, the final product is not preferable because the smell of ammonia water.

In addition, the acid value of the aqueous dispersion hydroxypropylmethyl cellulose phthalate is 110 ~ 130mgKOH / g, the amount of use is 1 ~ 80% by weight relative to the total weight of the monomer described later. If the amount is less than 1% by weight, it is difficult to act as a surfactant and the stability of the emulsified particles is not preferable. If the amount is more than 80% by weight, the gel phenomenon during polymerization is not preferable.

The aqueous dispersion hydroxypropylmethyl cellulose phthalate prepared as described above has both a surfactant function and a coagulation medium function. Therefore, when the toner is manufactured using the latex containing the aqueous dispersion hydroxypropylmethyl cellulose phthalate, a separate surfactant and an agglomeration medium (for example, a monomer containing a carboxyl group) are unnecessary, thereby reducing manufacturing costs. And simplify the manufacturing process. In this case, the aqueous dispersion hydroxypropylmethyl cellulose phthalate does not change the physical properties of the prepared latex nor impair the stability of the particles in the secondary process such as agglomeration process.

Specifically, the aqueous dispersion hydroxypropylmethyl cellulose phthalate is a kind of a polymeric surfactant composed of a hydrophilic portion and a hydrophobic portion like a conventional surfactant, and exhibits the same behavior as the surfactant in the water phase. That is, it has a hydrophilic portion and a hydrophobic portion together to form a micelle structure in water. As such, the aqueous dispersion hydroxypropylmethyl cellulose phthalate having a micelle structure is used as a reaction site in the emulsion polymerization, and the resulting polymer has a circular particle shape. In addition, the aqueous dispersion hydroxypropylmethyl cellulose phthalate of the micelle structure not only functions as a polymerization site of the monomer but also affects the stability of the microparticles, thereby imparting electrostatic or structural stability to the microparticles in the water phase, It prevents the sedimentation and also increases the binding force between the particles in the secondary coagulation process. This can be confirmed through the following examples and comparative examples.

Water dispersion Hydroxypropylmethyl  cellulose Phthalate  Preparation of Emulsifying Solution Containing

The aqueous dispersion hydroxypropylmethyl cellulose phthalate prepared as described above is mixed with water such as deionized water in a ratio of 1.0 to 50.0% by weight relative to the weight of water to prepare an emulsifier solution while stirring.

Manufacture of latex

The monomer is polymerized by adding a polymerization initiator and at least one monomer to the emulsifier solution. In this case, the mixture is maintained at a temperature of 60 to 80 ° C., in particular 75 ° C., for 1 to 2 hours so that the polymerization of the monomers is completed to complete the latex production.

When the latex produced by the production method of the present invention is used for the production of toner particles, a release agent and a molecular weight modifier can optionally be added at this stage.

The polymerization initiator is potassium persulfate, ammonium persulfate, sodium persulfate, potassium persulfite, ammonium persulfate, sodium persulfite, ammonium bisulfate, sodium bisulfate, 1,1'- diluted in water such as deionized water. Azobis (1-methylbutyronitrile-3-sodium sulfonate), 4,4'-azobis (4-cyanovaleric acid) and the like can be used.

 As the monomer, one or a plurality of monomers, for example, 1 to 10 types, more preferably 1 to 5 types of monomers may be used. Although it does not specifically limit as said monomer, Acrylic ester, methacrylic acid ester, styrene, the vinyl ester of aliphatic acid, and optionally a well-known crosslinking agent etc. can be used. Preference is given to using two or more monomers. Of these monomers, styrene, butyl acrylate, glycidyl methacrylate or 1,10-dodecanediacrylate, which do not contain a carboxyl group, are particularly preferred. Divinyl benzene, divinyl toluene, diacrylate or dimethacrylate may be used as the crosslinking agent.

The release agent may improve fixability of a toner image, and polyalkylene waxes such as low weight average molecular weight polypropylene and low molecular polyethylene, ester wax, carnauba wax, paraffin wax, and the like may be used as the release agent. have.

The molecular weight modifier is to adjust the molecular weight characteristics of the final latex, dodecanethiol, butanethiol, isooctyl-3-mercaptopropionate (IOMP), 2-methyl-5-t-butylthiophenol, carbon tetra Chloride, and / or carbon tetrabromide and the like can be used as the molecular weight modifier.

The present invention also provides a method for producing a toner using the latex prepared as described above. That is, toner may be prepared by mixing the latex, the colorant, and one or more additives.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example

Preparation Example 1 Preparation of Aqueous Dispersion Hydroxypropylmethyl Cellulose Phthalate

Into a temperature-controlled double jacketed reactor equipped with a heat exchanger, 566g of deionized water (84.0% by weight, the same as below) and 100g (14.8% by weight) of hydroxypropylmethyl cellulose phthalate were added. The temperature was raised to 75 ℃ and stirred for 1 hour to fully mix them. 8.0 g (1.2 wt%) of a neutralizing agent (ammonia water, concentration 25.0 (w / v)%) was added to the mixed solution, and the reaction was performed for about 1 hour. When the reaction was terminated it was cooled to room temperature. The resulting aqueous dispersion hydroxypropylmethyl cellulose phthalate had an acid value of 115 mgKOH / g, a solid content of 14.8% by weight, a pH of 5.12, and a viscosity of 303 cps.

Example 1-1 Preparation of Latex Using Aqueous Dispersion Hydroxypropylmethyl Cellulose Phthalate (1)

550 g of deionized water and 9 g of the aqueous dispersion hydroxypropylmethyl cellulose phthalate prepared in Preparation Example 1 were added to the reactor, and the reactor was heated to 85 ° C. while stirring. After the temperature of the reactor reached 85 ° C., 10.8 g of potassium persulfate was dissolved in 200 g of deionized water, and then totally charged into the reactor. Thereafter, a plurality of monomers and a release agent listed in Table 1 were continuously added to the reactor for 2 hours. After the addition was completed, the reaction was allowed to proceed for 1.5 hours, and then the reactor was cooled to terminate the reaction. The physical properties of the latex thus prepared were measured as shown in Table 1 below. That is, the weight average molecular weight was measured using gel permeation chromatography (GPC), Waters 515 HPLC Pump, Waters 2410 Differential Refractometer, and Waters 717plus Autosampler, and the particle size was measured using the Capillary Hydrodynamic Fractionation (CHDF) 2000. Using Instrument's DSC (Differential Scanning Calorimetry), the temperature was raised from 250 ° C to 10 ° C / min, and then rapidly cooled to room temperature (50 ° C / min). The temperature was raised to measure the glass transition temperature (Tg).

Example  1-2 ~ 1-5: Aqueous dispersion Hydroxypropylmethyl  cellulose Phthalate  Preparation of Latex Used (2) to (5)

Each latex was prepared in the same manner as in Example 1-1, except that the amount of aqueous dispersion hydroxypropylmethyl cellulose phthalate (W-HPMCP) was changed. The physical properties of each of the obtained latexes were measured and shown in Table 1.

Ingredient or property Example 1-1 Example 1-2 Example 1-3 Example 1-4 Example 1-5 Deionized water (g) 750 750 750 750 750 Styrene (g) 124 124 124 124 124 Butyl acrylate (g) 56 56 56 56 56 W-HPMCP ¹ (g) 12 18 36 54 90 CTA ² (g) 9 9 9 9 9 WE-5 ³ (g) 12.6 12.6 12.6 12.6 12.6 Potassium Persulfate ⁴ (g) 10.8 10.8 10.8 10.8 10.8 Glass transition temperature (℃) 52 51 51 52 52 Weight average molecular weight (Mw) 34,400 32,600 33,000 34,000 34,500 Acid value (mgKOH / g) 8 11 13 17 20 Particle size (nm) 300 200 150 120 100

 Note 1: 1: aqueous dispersion hydroxypropylmethyl cellulose phthalate

2: 1-dodecanethiol (molecular weight regulator) from Aldrich

3: release agent (wax) of Nippon Oil

4: polymerization initiator

 Referring to Table 1, the weight average molecular weight and the glass transition temperature of the latex prepared as the amount of the aqueous dispersion hydroxypropylmethyl cellulose phthalate were changed little, while the acid value increased when the amount was increased Particle size was found to decrease.

Example  1-6: Aqueous Dispersion Hydroxypropylmethyl  cellulose Phthalate  Preparation of Latexes Used (6)

514 g of deionized water and 0.8 g of the aqueous dispersion hydroxypropylmethyl cellulose phthalate prepared in Preparation Example 1 were added to the reactor, and the temperature of the reactor was heated to 75 ° C. while stirring. After the temperature of the reactor reached 75 ° C., 8.1 g of potassium persulfate was dissolved in 45 g of deionized water, and then a total amount thereof was added to the reactor. Thereafter, a plurality of monomers listed in Table 2 were continuously added to the reactor for 2 hours. After the addition was completed, the reaction was allowed to proceed for 1.5 hours, and then the reactor was cooled to terminate the reaction. The physical properties of the obtained latex were measured and shown in Table 2.

Examples 1-7 to 1-10: Preparation of latex using aqueous dispersion hydroxypropylmethyl cellulose phthalate (7) to (10)

Each latex was prepared in the same manner as in Example 1-6, except that the amount of HPMCP was changed. The physical properties of each of the obtained latexes were measured and shown in Table 2.

Ingredient or property Example 1-6 Example 1-7 Example 1-8 Example 1-9 Example 1-10 Deionized water (g) 771 771 771 771 771 Styrene (g) 424 424 424 424 424 Butyl acrylate (g) 116 116 116 116 116 GMA ¹ (g) 40 40 40 40 40 A-DOD ² (g) 1.89 1.89 1.89 1.89 1.89 CTA ³ (g) 378 378 378 378 378 W-HPMCP ⁴ (g) 11.5 15 20 25 30 Potassium Persulfate ⁵ 8.1 8.1 8.1 8.1 8.1 Glass transition temperature (℃) 55 57 56 59 58 Weight average molecular weight (Mw) 64,000 65,000 70,000 71,000 69,000 Acid value (mgKOH / g) 8.4 9.2 12 15 19 Particle size (nm) 130 135 128 138 120

Note 1: 1: glycidyl methacrylate (crosslinking agent)

2: 1,10-dodecane diacrylate (crosslinking agent)

3: 1-dodecanethiol (molecular weight regulator) from Aldrich

4: aqueous dispersion hydroxypropylmethyl cellulose phthalate

5: polymerization initiator

Referring to Table 2, the weight average molecular weight and glass transition temperature of the latex prepared as the amount of the aqueous dispersion hydroxypropylmethyl cellulose was hardly changed, and the acid value increased when the amount was increased. On the other hand, the particle size did not show a constant correlation with the increase or decrease.

Comparative example  1-1 to 1-5: Methacrylic acid  Manufacture of Latex Using (1) to (5)

Latex was prepared in the same manner as in Example 1-1, except that methacrylic acid was used instead of aqueous dispersion hydroxypropylmethyl cellulose phthalate.

Types and amounts of raw materials used and physical properties of the prepared latex were summarized and measured in Table 3 below.

Ingredient or property Comparative Example 1-1 Comparative Example 1-2 Comparative Example 1-3 Comparative Example 1-4 Comparative Example 1-5 Deionized water (g) 750 750 750 750 750 Styrene (g) 124 124 124 124 124 Butyl acrylate (g) 56 56 56 56 56 Methacrylic acid (g) 9 18 36 54 90 CTA ² (g) 9 9 9 9 9 WE-5 ³ (g) 12.6 12.6 12.6 12.6 12.6 Potassium Persulfate ⁴ (g) 10.8 10.8 10.8 10.8 10.8 Glass transition temperature (℃) 51 50 50 51 51 Weight average molecular weight (Mw) 32,100 37,000 45,000 73,000 120,000 Acid value (mgKOH / g) 9 14 19 27 34 Particle size (nm) 150 240 280 350 More than 700

NOTE 2, 3, 4: Same as used in Table 1 above.

Referring to Table 3, as the amount of methacrylic acid increased, the glass transition temperature of the prepared latex was hardly changed, but the weight average molecular weight, acid value, and particle size were found to increase.

Comparative example  1-6 ~ 1-10: 2- CEA Manufacture of Latex Using

Latex was prepared in the same manner as in Example 1-6, except that 2-CEA and Dofax were used instead of aqueous dispersion hydroxypropylmethyl cellulose phthalate and the amount of each component was changed as shown in Table 4 below.

 The type and amount of raw materials used, and the physical properties of the prepared latex are summarized and measured in Table 4 below.

Ingredient or property Comparative Example 1-6 Comparative Example 1-7 Comparative Example 1-8 Comparative Example 1-9 Comparative Example 1-10 Deionized water (g) 771 771 771 771 771 Styrene (g) 424 424 424 424 424 Butyl acrylate (g) 116 116 116 116 116 GMA ¹ 40 40 40 40 40 2-CEA ² 16.2 20.0 24.0 26.0 30.0 A-DOD ³ 1.89 1.89 1.89 1.89 1.89 CTA ⁴ 378 378 378 378 378 Dowfax ⁵ 11.5 11.5 11.5 11.5 11.5 Potassium Persulfate ⁶ 8.1 8.1 8.1 8.1 8.1 Glass transition temperature (℃) 57 58 59 59 58 Weight average molecular weight (Mw) 70,000 73,000 77,000 80,000 84,000 Acid value (mgKOH / g) 10 14 17 20 26 Particle size (nm) 120 135 150 140 180

 NOTE 1, 2, 3, 4, 6: Same as used in Table 2 above.

    5: Anionic Surfactants from Dow Chemical Company

Referring to Table 4, as the amount of 2-CEA increased, the glass transition temperature of the prepared latex was almost unchanged, the weight average molecular weight and acid value were increased, and the particle size was also generally increased.

In summary, the data of Table 1 and Table 2 shows that, in the case of the latex production method according to the present embodiment using an aqueous dispersion of hydroxypropylmethyl cellulose phthalate instead of a conventional surfactant, an expensive carboxylic acid-containing monomer is used. Without the glass transition temperature and weight average molecular weight it can be produced a latex is almost constant. These results prove that even when the amount of the aqueous dispersion hydroxypropylmethyl cellulose phthalate is changed, the change in physical properties (glass transition temperature) is insignificant or rather the physical properties (particle stability) are improved.

On the other hand, when combining the data of Table 3 and Table 4, in the case of the production method using a conventional carboxylic acid-containing monomer and optionally a surfactant, the latex produced as the amount of the carboxylic acid-containing monomer is increased The glass transition temperature did not change, but the weight average molecular weight and particle size were increased. These results prove that all the properties (glass transition temperature, particle stability) deteriorated as the amount of the carboxylic acid-containing monomer is increased.

Example  2-1: Example  Preparation of Toner Using Latex Prepared in 1-3

64 g of cyan pigment (PB 15.3, manufactured by Daeil Jeonghwa Co., Ltd.) was dispersed in a dispersion medium consisting of 7,900 g of latex and cyan pigment liquid [600 g of water and 5.0 g of anionic emulsifier (Dowfax) prepared in the method of Example 1-3 in a reactor. Preparation] After adding 40g, 537g NaOH was added to adjust the pH to 10. At this time, the mixture was stirred at a constant speed of 250 rpm. After stirring for 30 minutes, a solution of 625 g of deionized water mixed with 625 g of magnesium chloride was added to the reactor in a quantitative manner for 20 minutes, and the reactor was heated from room temperature to 65 ° C. at a heating rate of 1 ° C./min. After the reaction was performed at 65 ° C. for 2 hours, a solution obtained by mixing 1,000 g of sodium chloride with 4,000 g of deionized water was added to the reactor over about 1 hour. After 2 hours, the reactor was heated to 95 ° C. at a heating rate of 1 ° C./min, and the reaction proceeded for 2 hours. It was 6.3 micrometers when the particle size at this time was measured with the coulter counter. Thereafter, 3750 g of the latex prepared in Example 1-3 and 275 g of NaOH were mixed and further added to the reactor. After the addition, the reaction was performed at 95 ° C. for 5 hours, and then cooled to room temperature at a cooling rate of 1 ° C./min. The final toner particles obtained had a size of 6.0 mu m and a standard deviation of 1.27.

Example 2-2 Preparation of Toner Using Latex Prepared in Example 1-8

198 g of the latex prepared according to the method of Example 1-8 was added to the reactor, followed by stirring for 10 minutes at a speed of 4000 rpm, followed by cyan pigment solution [600 g of water and 5.0 g of anionic emulsifier (Dowfax). 40 g of pigments (PB 15.3, manufactured by Daeil Jeonghwa Co., Ltd.) were dispersed. A mixed solution of 2.25 g of polyaluminum chloride and 20.2 g of nitric acid was metered into the reactor over 30 minutes. At this time, the stirring speed was increased to 5,500 rpm and stirred for 10 minutes at high speed. Thereafter, the high speed agitation was stopped and the reactor was heated to 55 ° C. at a heating rate of 1 ° C./min while maintaining a stirring speed of 300 rpm, and then the reaction proceeded at 55 ° C. for 3 hours. It was 5.8 micrometers when the particle size at this time was measured with the Coulter counter. Thereafter, the mixture was stirred at a speed of 250 rpm for 30 minutes. Thereafter, 80 g of the latex prepared in Example 1-8 was further added to the reactor, and the stirring speed was sequentially decreased to proceed with the reaction at 200 rpm for 30 minutes. At this time, the particle size was 6.7 μm. After checking the particle size, the pH inside the reactor was adjusted to 4.0 using 1M NaOH solution, and the reactor was heated to 95 ° C. for 5 hours. As a result, particles having a smooth surface were obtained. Then, it cooled to 30 degreeC at the cooling rate of 1 degree-C / min. Next, the prepared aggregated particles were washed to remove residual impurities. The final toner particles obtained had a size of 6.5 탆 and a standard deviation of 1.3.

Comparative Example 2-1: Preparation of Toner Using Latex Prepared in Comparative Example 1-1

Toner was prepared in the same manner as in Example 2-1, except that latex prepared in Comparative Example 1-1 was used instead of latex prepared in Example 1-3.

The final toner particles obtained had a size of 6.5 탆 and a standard deviation of 1.31.

Comparative Example 2-2: Preparation of Toner Using Latex Prepared in Comparative Example 1-6

Toner was prepared in the same manner as in Example 2-2, except that latex prepared in Comparative Example 1-6 was used instead of latex prepared in Example 1-8.

The final toner particles obtained had a size of 7.2 탆 and a standard deviation of 1.25.

Comparing Examples 2-1 to 2-2 and Comparative Examples 2-1 to 2-2, the toner prepared by using aqueous dispersion hydroxypropyl methylcellulose phthalate may contain a carboxyl group-containing monomer and optionally a conventional surfactant. It can be seen that there is no difference in terms of particle size and standard deviation of the toner manufactured using the same.

Although the preferred embodiment according to the present invention has been described above, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (6)

(a) preparing an emulsifier solution comprising aqueous dispersion hydroxypropylmethyl cellulose phthalate; And (b) adding at least one monomer to the emulsifier solution to polymerize it. The method of claim 1, The aqueous dispersion hydroxypropylmethyl cellulose phthalate is prepared by emulsifying and dispersing hydroxypropylmethyl cellulose phthalate in water together with a neutralizing agent. The method of claim 2, The neutralizing agent is ammonia water, the amount of the latex production method, characterized in that 8 to 12% by weight relative to the weight of hydroxypropylmethyl cellulose phthalate. The method of claim 1, The acid value of the aqueous dispersion hydroxypropylmethyl cellulose phthalate is 110 ~ 130mgKOH / g method for producing a latex, characterized in that. The method of claim 1, The aqueous dispersion of hydroxypropylmethyl cellulose phthalate is used in the production method of latex, characterized in that 1 to 80% by weight relative to the total weight of the monomer. A method for producing a toner using latex prepared by the method according to any one of claims 1 to 5.