KR101796979B1 - Manufacturing process of polyketone pellet having white color - Google Patents

Abstract

The present invention relates to a process for the preparation of a mixed solvent comprising methanol and water in the presence of an organometallic complex catalyst consisting of a Group 9, a Group 10 or Group 11 transition metal compound, a ligand having an element of Group 15 elements and an anion of an acid having a pKa of 4 or less ; Preparing a methanol slurry by adding a mixed gas of carbon monoxide and an ethylenically unsaturated compound to a mixed solvent containing the catalyst; Drying the powder to a powder volatile content of 0.7 to 1.0% through the dryer; And extruder equipment to produce a polyketone pellet. The present invention also provides a method of polymerizing a polyketone pellet.

Description

TECHNICAL FIELD The present invention relates to a polymerization process for improving the color of polyketone pellets,

The present invention relates to a polymerization method capable of improving the quality by complementing the method of producing pellets of polyketone to lower the yellowness index (YI), which is a pellet color measurement value.

The polyketone having a structure in which repeating units derived from carbon monoxide and repeating units derived from an ethylenically unsaturated compound are substantially alternately linked has excellent mechanical and thermal properties and has high abrasion resistance, chemical resistance and gas barrier property, Expansion is expected. Specifically, polyketone is a useful material as high strength, high heat resistant resin, fiber, and film. Particularly, when a high molecular weight polyketone having an intrinsic viscosity of 2.5 dl / g or more is used as a raw material, a fiber or a film having a very high strength and an elastic modulus can be obtained. Such fibers and films are expected to be widely used for building materials such as belts, rubber reinforcements such as hoses and tire cords, concrete reinforcing materials, and industrial materials.

Polyketones can also be used in various industrial fields by adding additives in addition to the mechanical and chemical properties inherent in the polyketone mentioned above. Conventional methods for producing polyketones include a method in which polyketone is polymerized after solvent polymerization and polymerization is completed. When the polymerization is completed, 3 to 4 kinds of additives in powder form are mixed and pelletized through physical pelletizing, Lt; / RTI >

In the conventional polyketone pellets, the powder produced through the polymerization reaction is recovered in a slurry state together with methanol (MeOH), methanol is separated through a decanter, the dried powder is extruded through a dryer, And pellets were produced. The yellow index (YI) of the pellet is measured by the yellow index (YI), and the yellowness index (YI) of the pellet produced is about 20 levels. To expand the use of polyketone products, it is necessary to improve processes or develop new technologies to produce white pellets.

Korea Patent Publication No. 2015-0120097

Disclosure of the Invention The present invention aims at solving the above problems and aims to utilize powder volatility generated during polyketone production process to lower the yellowness of the produced polyketone pellets.

According to a preferred embodiment of the present invention, in the presence of an organometallic complex catalyst consisting of a Group 9, Group 10 or Group 11 transition metal compound, a ligand having an element of Group 15 elements and an anion of an acid having a pKa of 4 or less, To a mixed solvent consisting of water and water; Preparing a methanol slurry by adding a mixed gas of carbon monoxide and an ethylenically unsaturated compound to a mixed solvent containing the catalyst; Drying the powder to a powder volatile content of 0.7 to 1.0% through the dryer; And extruder equipment to produce a polyketone pellet. The present invention also provides a method of polymerizing a polyketone pellet.

Here, the polyketone pellet has a yellow degree of 10 or less, a molecular weight distribution of 1.5 to 2.5, and a viscosity of 1.0 to 1.4.

According to the method for producing polyketone of the present invention, it is possible to produce a high quality polyketone pellet that meets the low yellowness (YI) required by the customer.

Figure 1 is a graph of the yellowness data value of a pellet according to powder volatility at 250 rpm,
2 is a graph of the yellowness data value of the pellet according to the powder volatility at 350 rpm,
Fig. 3 is a photograph of colors of polyketone pellets prepared according to Comparative Examples and Examples. Fig.

The polyketone resin of the composition of the present invention is a new resin developed in recent years and is excellent in mechanical properties such as impact strength and molding characteristics and is a thermoplastic synthetic resin which is usefully applied to molded articles such as food containers and various parts. The mechanical properties of the polyketone resin belong to the category of high performance plastics. Polyketone resins having other desirable properties such as conductivity while retaining inherent physical properties such as mechanical properties and molding properties are widely used for various purposes. In addition, polyketone resin is a polymer material synthesized from carbon monoxide as a raw material, and has attracted great attention as an environmentally friendly material.

Generally, the polyketone resin is synthesized from carbon monoxide and olefins. For example, U.S. Patent No. 4,843,144 discloses line alternating polymers synthesized from olefins such as ethylene and propylene and carbon monoxide. The polyketone resin produced in this patent has been shown to have excellent impact resistance, high rebound resilience at room temperature and low temperature, and excellent creep properties.

In recent years, among polyketones, there is a growing interest in a series of alternating polyketones in which ketone groups and at least one ethylenically unsaturated hydrocarbon are alternately polymerized and improved in mechanical properties and molding characteristics. For example, U.S. Patent No. 4,880,903 discloses a polyketone terpolymer in which ketone groups, ethylene, and other olefinically unsaturated hydrocarbons (such as propylene) are alternately polymerized and formed.

The contents of the aforementioned U.S. Patent Nos. 4,843,144 and 4,880,903 are incorporated herein by reference.

Specifically, the linear alternating polyketone as a main component of the polyketone resin composition of the present invention is a linear alternating structure composed of a ketone group and at least one ethylenically unsaturated hydrocarbon, and substantially one carbon monoxide (or ketone group ), And is excellent in physical properties, appearance characteristics and molding properties.

The polyketone resin is a copolymer composed of repeating units represented by the general formulas (1) and (2), and it is preferable that y / x is 0.1 to 0.3. When the value of the y / x value is less than 0.1, there is a limit of low melting and workability, and when it exceeds 0.3, the mechanical properties are poor. Further, y / x is more preferably from 0.12 to 0.17.

- [- CH2CH2-CO] x- (1)

- [- CH2 --CH (CH3) - CO] y - (2)

Ethylenically unsaturated hydrocarbons suitable for use as precursors of the polyketone are, on the other hand, ethylenically unsaturated hydrocarbons suitable for use as precursors of the polyketones include ethene,? -Olefins (e.g., propene, 1-butene aliphatic hydrocarbons such as isobutene, 1-hexene and 1-octene, or aryl aliphatic hydrocarbons in which aryl substituents are formed on aliphatic molecules, in particular ethylenically unsaturated carbon Is an aryl aliphatic hydrocarbon having an aryl substituent on the atom. Examples of the aryl aliphatic hydrocarbon in the ethylenic unsaturated hydrocarbon include styrene, p-methylstyrene, p-ethylstyrene, and m-isopropyl styrene.

Such ethylenically unsaturated hydrocarbons and ketone compounds are copolymerized to form a linear alternating polyketone. Among them, a linear alternating polyketone formed by copolymerization of ethene and a ketone compound, or a mixture of at least three Linear alternating polyketone formed by copolymerization of an ethylenically unsaturated hydrocarbon having a carbon atom is preferable in view of the fact that the copolymerization reaction is easy and the molecular weight of the copolymerized linear alternating polyketone is relatively uniform. In short, the preferred polyketone resin is a copolymer of carbon monoxide and ethene, more preferably a second ethylenically unsaturated hydrocarbon having carbon monoxide, ethene and at least three carbon atoms (especially propene) is a linear terpolymer with an a-olefin.

The polyketone resin is preferably a polyketone polymer having a number average molecular weight of 100 to 200,000, particularly 20,000 to 90,000, as measured by gel permeation chromatography. The physical properties of the polymer are determined according to the molecular weight, depending on whether the polymer is a copolymer or a terpolymer and, in the case of a terpolymer, the properties of the second hydrocarbon part. The melting point of the total of the polymers used in the present invention is 175 ° C to 300 ° C, and generally 210 ° C to 270 ° C. The intrinsic viscosity (LVN) of the polymer measured by HFIP (hexafluoroisopropyl alcohol) at 60 DEG C using a standard tubular viscosity measuring apparatus is 0.5 dl / g to 10 dl / g, preferably 0.8 dl / g to 4 dl / g, And more preferably 1.0 dl / g to 1.4 dl / g. If the intrinsic viscosity is less than 1.0 dl / g, the mechanical properties are deteriorated. If the intrinsic viscosity exceeds 1.4 dl / g, the workability is deteriorated.

On the other hand, the molecular weight distribution of the polyketone is preferably 1.5 to 2.5, more preferably 1.8 to 2.2. When the ratio is less than 1.5, the polymerization yield decreases. When the ratio is 2.5 or more, the moldability is poor. In order to control the molecular weight distribution, it is possible to adjust proportionally according to the amount of the palladium catalyst and the polymerization temperature. That is, when the amount of the palladium catalyst is increased or when the polymerization temperature is 100 ° C or higher, the molecular weight distribution becomes larger.

The melting point of the polyketone resin is usually in the range of 175 ° C to 300 ° C, specifically 210 ° C to 270 ° C.

In one preferred embodiment, antioxidants, heat stabilizers, lubricants, processing aids and weathering stabilizers may be added to the polyketone resin composition of the present invention, alone or in combination.

As the antioxidant, a phenolic oxamide antioxidant may be used, which has a deactivation effect of the metal catalyst used in the polymerization. The antioxidant is preferably contained in an amount of 0.1 to 0.5 parts by weight based on 100 parts by weight of the polyketone resin. If the content of the antioxidant is less than 0.1 parts by weight, the deactivation function of the metal catalyst may be deteriorated. If the amount is more than 0.5 parts by weight, the physical properties of the product may be deteriorated.

Examples of the heat stabilizer include phosphorus thermal stabilizers, particularly hydroxy apatite represented by M ₁₀ (PO ₄ ) ₆ (OH) ₂ (wherein M is barium, strontium or calcium), preferably calcium hydroxyapatite Can be used, which suppresses the problem of an increase in viscosity during processing. The heat-resistant stabilizer is preferably contained in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the polyketone resin. If the content of the heat-resistant stabilizer is less than 0.1 parts by weight, the viscosity-increasing inhibiting function may be deteriorated. If the content is more than 2 parts by weight, the physical properties of the product may be deteriorated.

As the activator, an ethylene-methacrylic acid ester and / or a polyethylene-based synthetic lubricant such as ethylene bisstearamide, which is an acrylic lubricant, may be used. These lubricants are preferably contained in an amount of 0.1 to 1 part by weight per 100 parts by weight of the polyketone resin. If the content of the lubricant is less than 0.1 part by weight, the appearance quality may be deteriorated, and if it exceeds 1 part by weight, the mechanical properties may be deteriorated.

As the processing agent, ethylene methacrylic acid may be used. As the weather stabilizer, a benzotriazole-based material, a triazine-based material, a hindered amine-based material, or the like may be used, but not always limited thereto.

The method for producing a polyketone composition of the present invention comprises: preparing a catalyst composition comprising a palladium compound, an acid having a pKa value of 6 or less, and a bidentate compound of phosphorus; Preparing a mixed solvent (polymerization solvent) containing an alcohol (for example, methanol) and water; Conducting the polymerization in the presence of the catalyst composition and the mixed solvent to prepare a linear terpolymer of carbon monoxide, ethylene and propylene; Removing the remaining catalyst composition from the linear terpolymer with a solvent (e.g., alcohol and acetone) to obtain a polyketone resin; And a reaction-type plasticizer to which the polyketone resin is subjected to amine-substituted polyglycol at the terminal thereof to prepare a composition.

As the palladium compound constituting the catalyst composition, palladium acetate can be used, and the amount of the palladium compound used is suitably 10 ^-3 to 10 ^-1 mole.

As the acid having a pKa value of 6 or less constituting the catalyst composition, at least one selected from the group consisting of trifluoroacetic acid, p-toluenesulfonic acid, sulfuric acid and sulfonic acid, preferably trifluoroacetic acid, may be used. 6 to 20 (mol) equivalents relative to the compound is appropriate.

 Examples of the bidentate ligand compound constituting the catalyst composition include 1,3-bis [diphenylphosphino] propane (e.g., 1,3-bis [di (2-methoxyphenylphosphino) propane) Bis [bis [anisyl] phosphinomethyl] -1,5-dioxaspiro [5,5] undecane, the amount of which is 1 to 1.2 ) Equivalent.

The carbon monoxide, ethylene and propylene are liquid phase polymerized in a mixed solvent of alcohol (e.g. methanol) and water to produce a linear terpolymer. As the mixed solvent, a mixture of 100 parts by weight of methanol and 2 to 10 parts by weight of water may be used. If the content of water in the mixed solvent is less than 2 parts by weight, a ketal may be formed to lower the heat stability in the process. If the amount is more than 10 parts by weight, the mechanical properties of the product may be deteriorated.

The polymerization temperature is preferably in the range of 50 to 100 ° C and the reaction pressure in the range of 40 to 60 bar. The resulting polymer is recovered through filtration and purification processes after polymerization, and the remaining catalyst composition is removed with a solvent such as alcohol or acetone.

The production method of polyketone is carried out in the presence of an organometallic complex catalyst comprising (a) a Group 9, 10 or 11 transition metal compound, and (b) a ligand having an element of Group 15 elements, Wherein the carbon monoxide, ethylene and propylene are subjected to liquid phase polymerization in a mixed solvent of an alcohol (e.g., methanol) and water to produce a linear terpolymer, As the solvent, a mixture of 100 parts by weight of methanol and 2 to 10 parts by weight of water may be used. If the content of water in the mixed solvent is less than 2 parts by weight, a ketal may be formed to lower the heat stability in the process. If the amount is more than 10 parts by weight, the mechanical properties of the product may be deteriorated.

Wherein the catalyst comprises (a) a Group 9, 10 or 11 transition metal compound of the Periodic Table of the Elements (IUPAC Inorganic Chemical Nomenclature, 1989) and (b) a ligand having an element of Group 15 elements.

Examples of the Group 9 transition metal compound in the ninth, tenth, or eleventh group transition metal compound (a) include complexes of cobalt or ruthenium, carbonates, phosphates, carbamates, and sulfonates, Specific examples thereof include cobalt acetate, cobalt acetylacetate, ruthenium acetate, ruthenium trifluoroacetate, ruthenium acetylacetate, and ruthenium trifluoromethanesulfonate.

 Examples of the Group 10 transition metal compounds include complexes of nickel or palladium, carbonates, phosphates, carbamates, sulfonates and the like. Specific examples thereof include nickel acetate, nickel acetylacetate, palladium acetate, palladium trifluoroacetate , Palladium acetylacetate, palladium chloride, bis (N, N-diethylcarbamate) bis (diethylamine) palladium and palladium sulfate.

 Examples of the Group 11 transition metal compound include copper or silver complexes, carbonates, phosphates, carbamates, and sulfonates, and specific examples thereof include copper acetate, copper trifluoroacetate, copper acetylacetate, Examples of the fluoroacetic acid include silver acetyl acetate, trifluoromethanesulfonic acid and the like.

 Of these, the transition metal compound (a), which is preferable inexpensively and economically, is nickel and copper compounds, and the preferable transition metal compound (a) in terms of the yield of the polyketone and the molecular weight is the palladium compound, It is most preferable to use palladium acetate.

Examples of the ligands (b) having an atom of Group XIII include 2,2'-bipyridyl, 4,4'-dimethyl-2,2'-bipyridyl, 2,2'- Bis (diphenylphosphino) ethane, 1,3-bis (diphenylphosphino) propane, 1,4-bis (diphenylphosphino) (2-methoxyphenyl) propane, 1,3-bis [di (2-isopropyl) Bis (diphenylphosphino) cyclohexane, 1,2-bis (diphenylphosphino) phosphine] propane, (Diphenylphosphino) methyl] benzene, 1,2-bis [[di (2-methoxyphenyl) (Diphenylphosphino) ferrocene, 2-hydroxy-1,3-bis [di (2-methoxy- (2-methoxyphenyl) phosphino] propane, 2,2-dimethyl-1,3-bis [di (2- Spinosyns; there may be mentioned a ligand, such as propane.

Among these ligands, preferred ligands (b) having a Group 15 element are phosphorus ligands having an atom of Group 15, and particularly preferred ligands in terms of yield of polyketone are 1,3-bis [di (2- Methoxyphenyl) phosphino] propane and 1,2-bis [[di (2-methoxyphenyl) phosphino] methyl] benzene, Di (2-methoxyphenyl) phosphino] propane, and it is safe in that it does not require an organic solvent. Soluble sodium salts such as 1,3-bis [di (2-methoxy-4-sulfonic acid sodium-phenyl) phosphino] propane, 1,2- ] Methyl] benzene, and 1,3-bis (diphenylphosphino) propane and 1,4-bis (diphenylphosphino) butane are preferred for ease of synthesis and availability in large quantities and economically. The preferred ligand (b) having a Group 15 atom is 1,3-bis [di (2-methoxyphenyl) phosphino] propane or 1,3-bis (diphenylphosphino) Bis (di (2-methoxyphenyl) phosphino] propane or ((2,2-dimethyl-1,3-dioxane-5,5- -Methoxyphenyl) phosphine).

[Chemical Formula 1]

Bis (bis (2-methoxyphenyl) phosphine) bis ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis Activity equivalent to that of 3,3-bis- [bis- (2-methoxyphenyl) phosphanylmethyl] -1,5-dioxa-spiro [5,5] undecane, which is known to exhibit the highest activity among polymerization catalysts The structure is simpler and has a lower molecular weight. As a result, the present invention has been able to provide a novel polyketone polymerization catalyst having the highest activity as a polyketone polymerization catalyst of the present invention, while further reducing its manufacturing cost and cost. A method for producing a ligand for a polyketone polymerization catalyst is as follows. ((2,2-dimethyl) -2,3-dioxolane was obtained by using bis (2-methoxyphenyl) phosphine, 5,5-bis (bromomethyl) Bis (bis (methylene)) bis (bis (2-methoxyphenyl) phosphine) is obtained by reacting a bis (methylene) . The process for preparing a ligand for a polyketone polymerization catalyst according to the present invention is a process for producing a ligand for a polyketone polymerization catalyst which comprises reacting 3,3-bis- [bis- (2-methoxyphenyl) phosphanylmethyl] -1,5-dioxa-spiro [5,5] ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene)) bis (bis (2- Methoxyphenyl) phosphine) can be commercially synthesized in a large amount.

It is also preferable to use bis (bis (2-methoxyphenyl) phosphine as the ligand (cyclohexane-1,1-diylbis (methylene)) bis Respectively.

In a preferred embodiment, the process for preparing a ligand for a polyketone polymerization catalyst of the present invention comprises: (a) introducing bis (2-methoxyphenyl) phosphine and dimethylsulfoxide (DMSO) into a reaction vessel under nitrogen atmosphere, Adding sodium and stirring; (b) adding 5,5-bis (bromomethyl) -2,2-dimethyl-1,3-dioxane and dimethylsulfoxide to the resulting mixture, followed by stirring and reacting; (c) adding methanol and stirring after completion of the reaction; (d) adding toluene and water, separating the layers, washing the oil layer with water, drying with anhydrous sodium sulfate, filtering under reduced pressure, and concentrating under reduced pressure; And (e) the residue was recrystallized from methanol to obtain ((2,2-dimethyl-1,3-dioxane-5,5- diyl) bis (methylene)) bis (bis (2- methoxyphenyl) And a step of acquiring the image data.

The amount of the Group 9, Group 10 or Group 11 transition metal compound (a) to be used varies depending on the kinds of the ethylenic and propylenically unsaturated compounds to be selected and other polymerization conditions. Therefore, But it is usually from 0.01 to 100 mmol, preferably from 0.01 to 10 mmol, per 1 liter of the reaction zone. The capacity of the reaction zone means the liquid phase capacity of the reactor. The amount of the ligand (b) to be used is not particularly limited, but is usually 0.1 to 3 mol, preferably 1 to 3 mol, per 1 mol of the transition metal compound (a).

Further, the addition of benzophenone in the polymerization of the polyketone is another characteristic. In the present invention, an effect of improving the intrinsic viscosity of the polyketone can be achieved by adding benzophenone in the polymerization of the polyketone. The molar ratio of (a) the ninth, tenth, or eleventh transition metal compound to benzophenone is 1: 5-100, preferably 1:40-60. If the molar ratio of the transition metal to the benzophenone is less than 1: 5, the effect of improving the intrinsic viscosity of the produced polyketone is unsatisfactory. If the molar ratio of the transition metal to the benzophenone exceeds 1: 100, It is not preferable because it tends to decrease

Examples of the ethylenically unsaturated compound copolymerized with carbon monoxide include ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, -Olefins such as hexadecene and vinylcyclohexane; Alkenyl aromatic compounds such as styrene and? -Methylstyrene; But are not limited to, cyclopentene, norbornene, 5-methylnorbornene, 5-phenylnorbornene, tetracyclododecene, tricyclododecene, tricyclo undecene, pentacyclopentadecene, pentacyclohexadecene, Cyclic olefins such as cyclododecene; Vinyl halides such as vinyl chloride; Ethyl acrylate, and acrylates such as methyl acrylate. Of these, preferred ethylenically unsaturated compounds are? -Olefins, more preferably? -Olefins having 2 to 4 carbon atoms, and most preferably ethylene.

 Wherein the carbon monoxide and the ethylenically unsaturated compound and the propylenically unsaturated compound are copolymerized with an organometallic complex comprising a ligand (b) having an element of group 9, group 10 or group 11 transition metal compound (a) or group 15 Catalyzed, the catalyst is produced by contacting the two components. Any method may be employed as the method of contacting. That is, the solution may be prepared as a solution in which two components are premixed in a suitable solvent, or the two components may be supplied separately to the polymerization system and contacted in the polymerization system.

On the other hand, as the palladium compound constituting the catalyst composition, palladium acetate can be used, and the amount of the palladium compound used is suitably 10 ^-3 to 10 ^-1 mole.

As the acid having a pKa value of 6 or less constituting the catalyst composition, at least one selected from the group consisting of trifluoroacetic acid, p-toluenesulfonic acid, sulfuric acid and sulfonic acid, preferably trifluoroacetic acid, may be used. 6 to 20 (mol) equivalents relative to the compound is appropriate.

 Examples of the bidentate ligand compound constituting the catalyst composition include 1,3-bis [diphenylphosphino] propane (e.g., 1,3-bis [di (2-methoxyphenylphosphino) propane) Bis [bis [anisyl] phosphinomethyl] -1,5-dioxaspiro [5,5] undecane, the amount of which is 1 to 1.2 ) Equivalent.

According to the present invention, a mixture of methanol and water in the presence of an organometallic complex catalyst consisting of a Group 9, Group 10 or Group 11 transition metal compound, a ligand having an element of Group 15 and an anion of an acid having a pKa of 4 or less Adding to the solvent; Preparing a methanol slurry by adding a mixed gas of carbon monoxide and an ethylenically unsaturated compound to a mixed solvent containing the catalyst; Drying the powder through a dryer to a powder volatile content of 0.7 to 1.0% by weight; And extruder equipment to produce a polyketone pellet. It was confirmed that the volatility water acts as a plasticizer, blocking the aldol-condensation reaction, which is one of side reactions of polyketone polymerization, and affecting the color and lowering the yellowing degree.

Specifically, the powder volatile material means moisture or methanol gas.

Hereinafter, the constitution and effects of the present invention will be described in more detail with reference to examples and comparative examples. However, these examples are merely intended to clarify the present invention and are not intended to limit the scope of the present invention.

(Example 1)

(Bis (methylene)) bis (bis (2-methoxyphenyl) phosphine) was dissolved in 5 L of acetone, and then 2.8061 g Were added and dissolved. At the start of the polymerization, 14.252 g of triploloacetic acid was added and stirred to prepare a catalyst solution. 490 L of methanol, 7.9 L of water and 8.5 kg of polyketone powder for seeds were charged into a 1 m ³ stainless steel reactor, and the solution was subjected to nitrogen purge at 3.5 bar for 3 times to remove air. Propylene was filled in a 40 kg reactor in a fixed amount, and the temperature of the reactor was raised to 78 degrees Celsius. The stirrer was charged with stirring at a ratio of carbon monoxide: ethylene = 1: 1 to 56 bar. Polymerization was initiated by introducing the catalyst solution prepared above into a high pressure pump. The pressure of the polymerization reactor was supplemented with carbon monoxide: ethylene = 1: 1 at 78 ° C for 1 hour and 20 minutes and at 84 ° C for 2 hours and 50 minutes, Respectively. Thereafter, the polymerization was completed without maintaining the monomer feed for 25 minutes, and it was produced as polyketone pellets.

The yellowness of the polyketone was measured by setting the concentration of the powder volatile material generated in the polymerization method to 0.8 wt%.

(Comparative Example 1)

The experiment was conducted in the same manner as in Example 1, except that the concentration of powder volatile was set to 0.4 wt%.

The yellowness values of Example 1 and Comparative Example 1 were measured and shown in Table 1.

Item Yellowness (YI) Example 1 7 Comparative Example 1 18

According to the present invention, it can be seen that the yellowness value of Example 1 having a higher powdery volatile substance is lower than that of Comparative Example 1.

Claims (3)

To a mixed solvent consisting of methanol and water in the presence of an organometallic complex catalyst consisting of a Group 9, a Group 10 or Group 11 transition metal compound, a ligand having an element of Group 15 elements and an anion of an acid having a pKa of 4 or less ; Preparing a methanol slurry by adding a mixed gas of carbon monoxide and an ethylenically unsaturated compound to a mixed solvent containing the catalyst; Drying the powder through a dryer to a powder volatile content of 0.7 to 1.0% by weight; And extruder equipment to produce a polyketone pellet,
Wherein the degree of yellowness of the polyketone pellet is 10 or less.
delete The method according to claim 1,
Wherein the polyketone pellets have a molecular weight distribution of 1.5 to 2.5 and an intrinsic viscosity of 1.0 to 1.4 dl / g.

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