KR102456256B1 - Composition for manufacturing polymer bead and process for manufacturing polymer bead using same - Google Patents

Abstract

The present specification is one or more vinyl-based monomers selected from the group consisting of aromatic vinyl-based monomers, acrylic acid or methacrylic acid alkyl ester monomers having 1 to 20 carbon atoms, and acrylic acid or methacrylic acid fluoroalkyl ester monomers having 1 to 20 carbon atoms. ; a chain transfer agent of Formula 1; a phenol-based compound containing Chemical Formula 2 at both terminals and containing Chemical Formula 3 and Chemical Formula 4 in the intermediate chain; initiator; And it relates to a polymer bead composition comprising a crosslinking agent and a method for producing a polymer bead using the same.

Description

Polymer bead composition and manufacturing method of polymer beads using the same

This specification claims priority to No. 10-2020-0101221 submitted to the Korean Intellectual Property Office on August 12, 2020, the contents of which are incorporated herein.

The present invention relates to a polymer bead, and more particularly, to a polymer bead composition having excellent heat resistance and a method for producing a polymer bead using the same.

Background to the present disclosure is provided herein, which does not necessarily imply known art.

Polymer beads based on polymer materials are highly versatile particles and are used for various purposes in the fields of electricity and electronics, as well as in the chemical and bio fields. Currently, it is used as a light diffuser in displays and lighting equipment, and in addition, it is widely used as an additive in various industrial fields such as paints, plastic molded products, and cosmetics. Various physical properties are required depending on the intended use.

The thermal decomposition of polymer beads is divided into chain end unzipping at 250~300℃ and unzipping by random scission above 300℃ depending on the temperature range, and pyrolysis by chain end unzipping at around 300℃ is polymer beads manufactured by suspension polymerization Due to the nature of the radical polymerization of , it is accompanied by an unequal reaction involving a vinyl group having an unsaturated bond at the end of the polymer chain, which is generated during the termination reaction, and generates a radical to cause unzipping from the end of the chain to cause thermal decomposition, so the heat resistance is lowered.

In Korea Patent Application Laid-Open No. 2012-0010366, a chain transfer agent and a silane monomer are added to a composition containing a specific vinylic monomer, a suspension is prepared by adjusting the stirring conditions, and then a polymerization is performed using the thermogravimetric analysis (TGA: Thermogravimetric Analysis) Disclosed are polymer beads that show a weight reduction rate of less than 20% when standing at 300° C. for 10 minutes and have a residual amount of polymer beads of 3% or more at 600° C.

However, the above polymer beads had somewhat insufficient heat resistance at 320°C, and optical properties such as refractive index were changed due to copolymerization of silane added to improve heat resistance. Differences in brightness and hiding may occur.

Accordingly, the present inventors implement a polymer bead composition comprising a specific monomer, a chain transfer agent, a phenolic compound, an initiator, and a crosslinking agent, thereby generating less fume at 320 ° C. It was confirmed that the bead was manufactured, and the present invention was completed.

In order to solve the above problems, an object of the present invention is to provide a polymer bead having less fumes even at a temperature of 320° C., excellent heat resistance, no color change, and little weight loss.

In another aspect of the present invention, it is intended to provide a method for preparing the polymer bead.

One embodiment of the present invention is one selected from the group consisting of an aromatic vinylic monomer, an acrylic acid or methacrylic acid alkyl ester monomer having 1 to 20 carbon atoms, and an acrylic acid or methacrylic acid fluoroalkyl ester monomer having 1 to 20 carbon atoms or more vinyl-based monomers; A chain transfer agent of Formula 1; A phenol-based compound including the following Chemical Formula 2 at both terminals, and the following Chemical Formula 3 and the following Chemical Formula 4 in the intermediate chain; initiator; And it provides a polymer bead composition comprising a crosslinking agent.

[Formula 1]

R-SH

(Wherein, R is a linear or branched alkyl group having 10 to 30 carbon atoms)

[Formula 2]

[Formula 3]

[Formula 4]

In addition, an embodiment of the present invention comprises the steps of preparing a polybur bead composition; And it provides a method for producing a polymer bead comprising the step of suspension polymerization of the polymer bead composition.

The polymer bead composition according to the present invention and the polymer bead prepared by the method for manufacturing polymer beads using the same have excellent heat resistance even at a temperature of 320° C., no color change, less weight loss, and less fumes. Efficiency can be improved.

1 shows the color of the polymer beads of Examples 1 to 5 of the present invention in a state of being heated at 320° C. for 30 minutes.
Figure 2 shows the color of the polymer beads of Comparative Examples 1 to 4 of the present invention heated at 320 ℃ for 30 minutes.
3 shows the results of TGA measurement of the polymer beads of Example 2 and the polymer beads of Comparative Examples 3 and 4 of the present invention.

Prior to describing the present invention in detail below, it is to be understood that the terminology used herein is for the purpose of describing specific embodiments and is not intended to limit the scope of the present invention, which is limited only by the appended claims. shall.

In addition, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor may properly define the concept of the term to describe his invention in the best way. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. However, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art, unless otherwise noted.

Throughout this specification and claims, unless stated otherwise, the term comprise, comprises, comprising is meant to include the stated object, step or group of objects, and steps, and any other object. It is not used in the sense of excluding a step or a group of objects or groups of steps.

On the other hand, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as particularly preferred or advantageous may be combined with any other feature and features indicated as preferred or advantageous.

One embodiment of the present invention provides a polymer bead composition.

The polymer bead composition is at least one vinyl-based monomer selected from the group consisting of an aromatic vinyl-based monomer, an acrylic acid or methacrylic acid alkyl ester monomer having 1 to 20 carbon atoms, and an acrylic acid or methacrylic acid fluoroalkyl ester monomer having 1 to 20 carbon atoms. monomer; A chain transfer agent of Formula 1; A phenol-based compound including the following Chemical Formula 2 at both terminals, and the following Chemical Formula 3 and the following Chemical Formula 4 in the intermediate chain; initiator; and a crosslinking agent.

[Formula 1]

R-SH

(Wherein, R is a linear or branched alkyl group having 10 to 30 carbon atoms)

[Formula 2]

[Formula 3]

[Formula 4]

The vinyl monomer of the present invention is one selected from the group consisting of an aromatic vinyl monomer, an acrylic acid or methacrylic acid alkyl ester monomer having 1 to 20 carbon atoms, and an acrylic acid or methacrylic acid fluoroalkyl ester monomer having 1 to 20 carbon atoms. More than one can be used.

The vinyl-based monomer is methyl methacrylate, divinyl benzene, butyl methacrylate, trimethylolmethane tetraacrylate, trimethylolmethane triacrylate , at least one selected from the group consisting of trimethylolbutane triacrylate and ethylene glycol dimethacrylate may be included. Preferably, at least one selected from the group consisting of methyl methacrylate, divinylbenzene and butyl methacrylate may be used as the vinyl-based monomer.

The chain transfer agent of the present invention is represented by Formula 1, and by removing radicals generated from the unsaturated bond of the terminal vinyl group to reduce the non-uniform termination reaction and unreacted monomer of the terminal vinyl group, it removes the monomer decomposed at high temperature Thus, heat resistance can be improved.

[Formula 1]

R-SH

(Wherein, R is a linear or branched alkyl group having 10 to 30 carbon atoms) As the chain transfer agent, at least one selected from the group consisting of 1-dodecanethiol, t-dodecylmercaptan and t-hexadecylmercaptan. may include

R may be a straight-chain alkyl group having 10 to 30 carbon atoms. When R is a straight-chain alkyl group. Since the reactivity of the chain transfer agent is high, there is an effect that it is easy to induce a chain transfer reaction. Polymer beads prepared using such a chain transfer agent have the advantage of excellent heat resistance.

In particular, the chain transfer agent may be 1-dodecanthiol.

When the chain transfer agent is used in excess, a polymer having a small molecular weight is produced a lot to increase the degree of reaction completion, but the solvent resistance is poor, which may give difficulties to the process when manufacturing the optical film. Therefore, it is important to use an appropriate amount of a chain transfer agent in order to provide heat resistance and solvent resistance as well.

The chain transfer agent may be used in an amount of 0.1 to 0.8 parts by weight, preferably 0.2 to 0.4 parts by weight, based on 100 parts by weight of the vinyl-based monomer. When the content of the chain transfer agent is 0.1 parts by weight or less, the effect of adding it to enhance heat resistance is insignificant, and when it is 0.8 parts by weight or more, polymerization stability is inhibited and the reactants may agglomerate.

In particular, the chain transfer agent is used simultaneously with the phenolic compound of the present invention, thereby preventing the initiation of thermal decomposition at 320 ° C. or higher, reducing the generation of fumes and improving work efficiency, improving heat resistance, reducing color change and reducing weight loss can be However, when the chain transfer agent is used simultaneously with antioxidants such as phosphorus-based, amine-based, hindered amine-based and sulfur-based compounds instead of the phenol-based compound of the present invention, heat resistance and reactivity tend to decrease.

The phenolic compound of the present invention includes Chemical Formula 2 at both terminals, Chemical Formulas 3 and 4 in the intermediate chain, and the intermediate chain includes 8 to 15 carbon atoms and may be formed in a straight chain.

[Formula 2]

[Formula 3]

[Formula 4]

The phenol-based compound may reduce the reaction when used alone in the polymer bead composition because the OH group of Formula 2 acts as a radical inhibitor, but by being used simultaneously with the chain transfer agent, only the peroxide radical generated during the polymer decomposition reaction is easily captured and removed Thus, heat resistance can be improved.

Although not theoretically established, the phenolic compound includes Chemical Formula 2 at both terminals, Chemical Formula 3 and Chemical Formula 4 in the intermediate chain, and the intermediate chain contains 8 to 15 carbon atoms and is formed in a straight-chain structure. Accordingly, it is expected that the polymer from which the peroxide radical generated during the polymer decomposition reaction is removed is located at both ends of the phenolic compound to prevent the initiation of thermal decomposition, thereby suppressing the generation of fumes, improvement of heat resistance, suppression of color change, and weight loss.

The phenol-based compound may be used in an amount of 0.08 to 0.5 parts by weight, further 0.12 to 0.30 parts by weight, based on 100 parts by weight of the vinyl-based monomer. When the content of the phenol-based compound is 0.08 parts by weight or less, the effect of adding it to enhance heat resistance is insignificant, and when it is 0.5 parts by weight or more, there is a fear that the reactants may agglomerate by inhibiting polymerization stability.

A representative example of the phenol-based compound is antioxidant 245, and CAS No. 36443-68-2.

The crosslinking agent of the present invention may use a compound containing two or more unsaturated carbons. Examples of the crosslinking agent include 1,2-ethanediol diacrylate, 1,3-propanediol diacrylate, 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, and 1,5-pentanediol diacrylate. Acrylate, 1,6-hexanediol diacrylate, divinylbenzene, ethylene glycol diacrylate, propylene glycol diacrylate, butylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, Polypropylene glycol diacrylate, polybutylene glycol diacrylate, allyl acrylate, 1,2-ethanediol dimethacrylate, 1,3-propanediol dimethacrylate, 1,3-butanediol dimethacrylate , 1,4-butanediol dimethacrylate, 1,5-pentanediol dimethacrylate, 1,6-hexanediol dimethacrylate, ethylene glycol dimethacrylate, propylene glycol dimethacrylate, butylene glycol Dimethacrylate, triethylene glycol dimethacrylate, trimethylpropane triacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, butylene glycol dimethacrylate, triethylene glycol methacrylate, polyethylene At least one selected from the group consisting of glycol dimethacrylate, polypropylene glycol dimethacrylate, polybutylene glycol dimethacrylate, allyl methacrylate and diallyl maleate may be included.

The content of the crosslinking agent may be used in an amount of 5 to 30 parts by weight based on 100 parts by weight of the vinyl-based monomer. Preferably, it may be used in an amount of 8 to 20 parts by weight. If the content of the crosslinking agent is less than 5 parts by weight, a role as a crosslinking agent cannot be expected, and if it exceeds 30 parts by weight, it may be difficult to control the heat of reaction.

Initiators of the present invention include radical initiators. The radical initiator may be a fat-soluble initiator or a water-soluble initiator. The oil-soluble initiator may include at least one selected from the group consisting of benzoyl peroxide, azobisisobutyronitrile, azobisphenylbutyronitrile, and azobiscyclohexanecarbonitrile. The water-soluble initiator includes at least one selected from the group consisting of potassium sulfate, sodium sulfate, ammonium persulfate, and azo-based water-soluble initiators.

The content of the initiator may be 0.1 to 3 parts by weight based on 100 parts by weight of the vinyl-based monomer. If the content of the initiator is less than 0.1 parts by weight, the degree of reaction completion may be reduced, and if it exceeds 3 parts by weight, it may be difficult to control the heat of reaction.

Another embodiment of the present invention provides a method for producing a polymer bead using the polymer bead composition.

Specifically, one embodiment of the present invention comprises the steps of preparing a polybur bead composition; And it provides a method for producing a polymer bead comprising the step of suspension polymerization of the polymer bead composition.

Suspension polymerization of the polymer bead composition may include adding a dispersion stabilizer and ion-exchanged water to the composition to prepare a premixing solution, and performing suspension polymerization using a homogenizer. That is, the polymer bead manufacturing method of the present invention prepares a polymer bead composition including the above-described vinyl-based monomer, chain transfer agent, phenol-based compound, initiator and cross-linking agent at the same time, and then premixing it by adding a dispersion stabilizer and ion-exchanged water. By preparing a solution and performing suspension polymerization using a homogenizer, polymer beads can be prepared.

The suspension polymerization is performed by raising the temperature of the reactor containing the emulsion stirred with a homogenizer to 50 to 70° C. under a nitrogen atmosphere and proceeding with suspension polymerization, compared to the case of suspension polymerization while raising the temperature of the reactor. It may react earlier than the phenol-based compound during suspension polymerization. Accordingly, by preventing the initiation of thermal decomposition at 320° C., the generation of fumes and heat resistance may be improved.

The step of suspension polymerization of the polymer bead composition comprises: raising the temperature of the reactor containing the emulsion stirred with a homogenizer to 50 to 70 °C under a nitrogen atmosphere;

subjecting the emulsion to a first suspension polymerization reaction at 50 to 70° C. for 5 to 8 hours; and

The method may include subjecting the reactant generated by the first suspension polymerization reaction to a second suspension polymerization reaction at 85 to 95° C. for 2 to 6 hours.

The step of suspension polymerization of the polymer bead composition comprises the steps of preparing a premixing solution by stirring at a stirring speed of 100rpm to 900rpm; and

It may include agitating the premixing solution at a pressure of 2,000 to 10,000 psi with a homogenizer.

According to the present invention, by subjecting the premixing solution to a suspension polymerization step in which the premixing solution is stirred using a homogenizer, polymer bead particles produced after suspension polymerization can be uniformly formed, so that a wide particle distribution may not be formed, and suspension polymerization When agglomerates are reduced, heat resistance can be improved.

At this time, the premixing solution is prepared by stirring at a stirring speed of 100rpm to 900rpm, and the premixing solution is preferably stirred at a pressure of 2,000 to 10,000 psi with a homogenizer to form an emulsion. If the homogenizer pressure is less than 2000 psi, the homogenization effect may be insufficient, and if the homogenizer pressure exceeds 10,000 psi, heat may be generated due to the high pressure and the reaction may be unstable.

Hereinafter, preferred examples are presented to help the understanding of the present invention, but the following examples are only illustrative of the present invention and the scope of the present invention is not limited to the following examples.

Example 1

As shown in Table 1 below, methyl methacrylate (MMA), 1-dodecanthiol, phenolic compound (Antioxidant 245, CAS No. 36443-68-2), ethylene glycol dimethacrylate (EGDMA), trimethyl Propane triacrylate (TMPTA) and azobisisobutyronitrile (AIBN) were added and mixed. Dissolve 180 g of ion-exchanged water and 20 g of dispersion stabilizer (polyvinyl alcohol (Mw = 10,000)), administer the mixture to this solution, and stir at 900 rpm for 30 minutes using a mechanical stirrer to premix ( Premixing) solution was prepared. The premixing solution was homogenized at 6000 psi using a homogenizer to prepare an emulsion. Thereafter, the emulsion was put into a reactor having a temperature of 60° C. under a nitrogen atmosphere, and the first suspension polymerization reaction was carried out for 8 hours while stirring at a speed of 200 rpm, and the second suspension polymerization reaction was carried out for 4 hours by raising the temperature to 90° C. . The polymer synthesized by the above reaction was filtered, washed with water and an aqueous ethanol solution, and the filtrate was placed in a vacuum oven and dried for one day to prepare polymer beads.

Examples 2 to 5

Polymer beads were prepared in the same manner as in Example 1, except that the components were changed as shown in Table 1 below.

Comparative Examples 1 to 4

Polymer beads were prepared in the same manner as in Example 1, except that the components were changed as shown in Table 2 below.

Comparative Examples 5 to 9

Polymer beads were prepared in the same manner as in Example 1, except that the components were changed as shown in Table 3 below. That is, polymer beads not containing a phenol-based compound were prepared.

ingredient Content (parts by weight) Example 1 Example 2 Example 3 Example 4 Example 5 vinyl monomer MMA 100 chain transfer agent Dodecanethiol 0.34 0.34 0.34 0.56 0.79 phenolic compounds Antioxidant 245 0.11 0.23 0.34 0.23 0.23 Irganox® 1010 ¹⁾ - - - - - non-phenolic compounds AN 1425 - - - - - crosslinking agent EGDMA 9.04 TMPTA 3.08 initiator AIBN 0.31 ¹⁾ Irganox® 1010: manufactured by BASF

ingredient Content (parts by weight) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 vinyl monomer MMA 100 chain transfer agent Dodecanethiol 0.34 - 0.34 0.34 phenolic compounds Antioxidant 245 - 0.23 - - Irganox® 1010 ¹⁾ - - 0.23 - non-phenolic compounds AN 1425 - - - 0.23 crosslinking agent EGDMA 9.04 TMPTA 3.08 initiator AIBN 0.31 ¹⁾ Irganox® 1010: manufactured by BASF

ingredient Content (parts by weight) Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 vinyl monomer MMA 100 chain transfer agent Dodecanethiol
(NDM) 0.2 tert-dodecyl mercaptan
(TDM) 0.2 0.34 0.56 crosslinking agent EGDMA 9.04 TMPTA 3.08 initiator AIBN 0.31 ¹⁾ Irganox® 1010: manufactured by BASF

Heat resistance evaluation

After 10 g of polymer beads were placed in an aluminum dish and left in an oven at 320° C. for 30 minutes, the weight loss rate was calculated by the following formula and summarized in Table 3 below, and the color change was visually observed and illustrated in FIGS. 1 and 2 .

Weight loss rate = [ (weight of sample before leaving - weight of sample after leaving) / weight of sample before leaving] * 100

Thermogravimetric Analysis (TGA) measurement

Using TA Instrument's TGA Q500 model, the mass change according to the temperature was measured in an air atmosphere at a rate of 10 °C/min to 500 °C, shown in FIG. 3, and the 3% weight loss point temperature was indicated as a measurement index.

Heat resistance evaluation TGA measurement weight loss rate 3% Weight Loss Temperature Example 1 6.8% 305℃ Example 2 4.0% 322℃ Example 3 6.3% 307℃ Example 4 6.1% 310℃ Example 5 7.4% 304℃ Comparative Example 1 71.0% 285℃ Comparative Example 2 62.2% 288℃ Comparative Example 3 24.2% 298℃ Comparative Example 4 78.5% 278℃ Comparative Example 5 unmeasured 286℃ Comparative Example 6 unmeasured 277℃ Comparative Example 7 unmeasured 280℃ Comparative Example 8 unmeasured 298℃

As can be seen in Table 4 and FIG. 1, Examples 1 to 5 had a weight loss rate of less than 8% at 320°C, no color change, and a 3% weight loss point temperature in TGA measurement exceeding 300°C. Confirmed. On the other hand, Comparative Examples 1 and 2 did not contain a phenol-based compound or a chain transfer agent, respectively, as can be seen in Table 3 and FIG. Clearly, it was confirmed that the 3% weight loss point temperature in the TGA measurement was less than 300°C.

Comparative Example 3 includes a phenolic compound other than the phenolic compound of the present invention, and as can be seen in Table 3, FIGS. 2 and 3, the weight loss rate at 320°C exceeds 20%, and the color change is It was confirmed that the temperature at the 3% weight loss point in the TGA measurement was less than 300°C.

Comparative Example 4 includes a non-phenol-based compound rather than a phenol-based compound, and as can be seen in Table 3, FIGS. 2 and 3, the weight loss rate at 320° C. exceeds 70%, and a color change occurs. , it was confirmed that the temperature at the 3% weight loss point during TGA measurement was less than 300°C.

On the other hand, when the phenol-based compound was not included (Comparative Examples 5 to 8), it was confirmed that the temperature at the 3% weight loss point during TGA measurement was less than 300°C.

Claims (9)

At least one vinyl-based monomer selected from the group consisting of aromatic vinyl-based monomers, acrylic acid or methacrylic acid alkyl ester monomers having 1 to 20 carbon atoms, and acrylic acid or methacrylic acid fluoroalkyl ester monomers having 1 to 20 carbon atoms;
A chain transfer agent of Formula 1;
A phenol-based compound including the following Chemical Formula 2 at both terminals, and the following Chemical Formula 3 and the following Chemical Formula 4 in the intermediate chain;
initiator; and a crosslinking agent;
The polymer bead composition in which the content of the crosslinking agent is 5 to 30 parts by weight based on 100 parts by weight of the vinyl-based monomer.
[Formula 1]
R-SH
(Wherein, R is a linear or branched alkyl group having 10 to 30 carbon atoms)
[Formula 2]

[Formula 3]

[Formula 4]

The method according to claim 1,
The vinyl monomer is methyl methacrylate, divinylbenzene, butyl methacrylate, trimethylolmethane tetraacrylate, trimethylolmethane triacrylate, trimethylol butane triacrylate and ethylene glycol dimethacrylate from the group consisting of A polymer bead composition that is one or more selected. The method according to claim 1,
The polymer bead composition is that the chain transfer agent is at least one selected from the group consisting of 1-dodecanethiol, t-dodecylmercaptan and t-hexadecylmercaptan. The method according to claim 1,
The polymer bead composition that the chain transfer agent is included in an amount of 0.1 to 0.8 parts by weight based on 100 parts by weight of the vinyl-based monomer. (a) at least one vinyl-based monomer selected from the group consisting of an aromatic vinyl-based monomer, an acrylic acid or methacrylic acid alkyl ester monomer having 1 to 20 carbon atoms, and an acrylic acid or methacrylic acid fluoroalkyl ester monomer having 1 to 20 carbon atoms , Preparing a composition comprising a chain transfer agent of Formula 1, a phenol-based compound including Formula 2 below at both terminals and Formula 3 and Formula 4 in an intermediate chain, an initiator, and a crosslinking agent;
(b) preparing a premixing solution by adding a dispersion stabilizer and ion-exchanged water to the composition, and performing suspension polymerization using a homogenizer;
In the suspension polymerization, the temperature of the reactor containing the emulsion stirred with a homogenizer is raised to 50 to 70° C. under a nitrogen atmosphere, and the emulsion is subjected to a first suspension polymerization reaction at 50 to 70° C. for 5 to 8 hours, The method for producing polymer beads according to any one of claims 1 to 4, wherein the second suspension polymerization reaction is carried out for 2 to 6 hours at 85 to 95° C. of the reactant generated by the first suspension polymerization reaction.
[Formula 1]
R-SH
(Wherein, R is a linear or branched alkyl group having 10 to 30 carbon atoms)
[Formula 2]

[Formula 3]

[Formula 4]

Preparing a polybur bead composition according to any one of claims 1 to 4; and
Method for producing a polymer bead comprising the step of suspension polymerization of the polymer bead composition. 7. The method of claim 6,
The step of suspension polymerization of the polymer bead composition comprises adding a dispersion stabilizer and ion-exchanged water to the composition to prepare a premixing solution, and performing suspension polymerization using a homogenizer. 7. The method of claim 6,
The step of suspension polymerization of the polymer bead composition comprises: raising the temperature of the reactor containing the emulsion stirred with a homogenizer to 50 to 70 °C under a nitrogen atmosphere;
subjecting the emulsion to a first suspension polymerization reaction at 50 to 70° C. for 5 to 8 hours; and
A method for producing polymer beads comprising the step of subjecting the reactant generated by the first suspension polymerization reaction to a second suspension polymerization reaction at 85 to 95° C. for 2 to 6 hours. 7. The method of claim 6,
The step of suspension polymerization of the polymer bead composition comprises the steps of preparing a premixing solution by stirring at a stirring speed of 100rpm to 900rpm; and
Method for producing polymer beads comprising the step of stirring the premixing solution with a homogenizer 2,000 to 10,000 psi pressure.

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