KR20160054954A - Polyketone vehicle fuel tank - Google Patents

Abstract

The present invention relates to a fuel tank for vehicles, which is produced by injection-molding linear alternating polyketone consisting of carbon monoxide and at least one ethylene-based unsaturated hydrocarbon and, more specifically, to a fuel tank for vehicles, having improved gas barrier, oil resistance, air tightness, dimensional stability and impact resistance.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyketone vehicle fuel tank,

TECHNICAL FIELD The present invention relates to a polyketone used in a fuel tank for an automobile, and more particularly to an automotive fuel tank obtained by injection molding a linear alternating polyketone composed of carbon monoxide and at least one ethylenic unsaturated hydrocarbon.

Polyketone polymers, which are linear alternating copolymers of carbon monoxide and olefinically unsaturated compounds, have high stability in the presence of hydrocarbon liquids, which are very useful for use as materials for containers for liquids for automotive fuels. US-A-4965104 Lt; / RTI > Many molding techniques can be used according to US-A-4965104 to process the copolymer into containers. Examples of such techniques include blow molding, rotational molding, vacuum molding, injection molding and extrusion.

In order to produce a typical fuel tank, it is common to use a blow molding technique. In the blow molding method, a parison, which is a tube of molten polymer, is first prepared and the parison is inflated on the inner surface of the female mold to continuously form the hollow body.

Methods for making polyketone polymers suitable for use in the present invention are known in the art. The method comprises contacting carbon monoxide and an olefinically unsaturated compound in the presence of a catalyst composition formed from a palladium compound and a bidentate ligand of phosphorus. Other methods of manufacture and methods that may be applied are described in EP-A-307207, EP-A-181014, EP-A-121965, EP-A-391579, EP- A-590042, EP-A-619335 and EP-A-616848.

Typically injection molded polyketone polymer compositions further contain a stabilizer. Stabilizers that will normally be present are compounds which are capable of improving at least one of oxidative stability, melt stability and UV stability. Stabilizers providing very good results are described in EP-A-289077, EP-A-322043, EPA-478088 and EP-A-326223.

Other conventional additives are fillers, extenders, lubricants, pigments, especially black pigments, plasticizers and other polymeric materials that improve or otherwise modify the properties of the composition. These can be dispersed in the polyketone polymer matrix by a variety of methods known to those skilled in the art.

In addition, the polyketone polymer composition may contain glass fibers and reinforcements such as Mica. However, in this case, it is preferable not to have these.

Injection molding consists of injecting a molten polyketone polymer composition from a heated barrel into a cooled mold and then removing the polyketone polymer product from the mold. The temperature and pressure at which the viscous polyketone polymer composition is preferably injected will further depend on the type of mold, the method properties such as the desired properties of the polyketone polymer and the injection molded product used. Typically, the temperature at which the polyketone polymer is injected is from 230 to 300 占 폚.

Further applicable injection molding process features are known to be advantageous in the conventional field of injection molding.

An automotive fuel tank characterized by molding such a conventional polyketone polymer has some degree of gas barrier, oil resistance, airtightness, dimensional stability, and impact resistance, but is not sufficient.

Korean Patent No. 1004453540000 Korean Patent No. 1008108650000

In order to solve the above problems, it is an object of the present invention to provide a fuel tank for automobiles, which is characterized by sufficient gas barrier, oil resistance, airtightness, dimensional stability and impact resistance by using polyketone having new physical properties.

In order to achieve the above technical object, the present invention is a polyketone copolymer comprising repeating units represented by the following general formulas (1) and (2), wherein a polyketone copolymer having y / x of 0.03 to 0.3 is injection- And a fuel tank for an automobile.

- (CH2CH2-CO) -

- (CH2CH (CH3) -CO) -

(x and y are mole% of each of the general formulas (1) and (2) in the polymer)

In addition, the present invention relates to a process for the preparation of (2, 2-dimethyl-1,3-dioxane-5,5-diyl) bis )) Bis (bis (2-methoxyphenyl) phosphine).

Specifically, the fuel tank has a gas permeability coefficient of 0.01 g · mm / m ² · day or less at 23 ° C., 50% relative humidity and filled with fuel.

In addition, the present invention provides a fuel tank for a motor vehicle having a gas permeability coefficient of 5 g · mm / m ² · day or less at 23 ° C., 50% relative humidity and filled with fuel and 15% methanol.

The fuel tank for an automobile according to the present invention has an effect of sufficiently improving gas barrier, oil resistance, airtightness, dimensional stability and impact resistance as compared with conventional polyketone. Accordingly, it is possible to obtain a fuel tank for automobiles in which polyketone is injection-molded to improve gas barrier, oil resistance, airtightness, dimensional stability and impact resistance.

1. Polyketone polymer composition

The polyketone polymer of the present invention is a linear alternating structure and substantially contains carbon monoxide per one molecule of unsaturated hydrocarbon. Ethylenically unsaturated hydrocarbons suitable for use as precursors of polyketone polymers have up to 20 carbon atoms, preferably up to 10 carbon atoms. Ethylenically unsaturated hydrocarbons can also be selected from the group consisting of ethene and alpha-olefins such as propene, 1-butene, iso-butene, 1- hexene, 1- octene, , Or an aryl aliphatic group containing an aryl substituent on another aliphatic molecule, particularly containing an aryl substituent on an ethylenically unsaturated carbon atom. Examples of aryl aliphatic hydrocarbons in ethylenically unsaturated hydrocarbons include styrene, p-methyl styrene, p-ethyl styrene and m-isopropyl styrene. The polyketone polymer preferably used in the present invention is a copolymer of carbon monoxide and ethene or a second ethylenically unsaturated hydrocarbon having carbon monoxide, ethene and at least three carbon atoms, in particular alpha-olefins such as propene Is a terpolymer.

 When the polyketone terpolymer is used as the main polymer component of the blend of the present invention, there are at least two units containing an ethylene moiety in each unit containing the second hydrocarbon moiety in the terpolymer. It is preferable that the number of units containing the second hydrocarbon moiety is from 10 to 100.

 Particularly preferred are polyketone polymers having a number average molecular weight of from 100 to 200,000, especially from 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 (Hexafluoroisopropylalcohol) at 60 DEG C using a standard tubular viscosity measuring device is 0.5 dl / g to 10 dl / g, and preferably 1.0 dl / g to 2.0 dl / g . If the intrinsic viscosity is less than 0.5 dl / g, the mechanical properties are deteriorated. If the intrinsic viscosity exceeds 10 dl / g, the workability is deteriorated.

 A preferred process for producing a polyketone polymer is disclosed in U.S. Patent No. 4,843,144. In the presence of a catalyst composition suitably produced from an anion of a non-hydrohalogenic acid having a pKa of less than 6 or preferably less than pKa < 2 > and a bidentate ligand of phosphorus (measured in water at 18 DEG C), carbon monoxide and a hydrocarbon monomer Is contacted under polymerization conditions to prepare a polyketone polymer.

A preferred process for producing a polyketone polymer is disclosed in U.S. Patent No. 4,843,144. The carbon monoxide and the hydrocarbon monomer are brought into contact under polymerization conditions in the presence of a catalyst composition suitably produced from a palladium compound, an anion of a hydrohalogenic acid having a pKa of 6 or less, preferably less than pKa 2, and a bidentate two-coordinate ligand, to produce a polyketone polymer.

As the production method of the polyketone resin, liquid phase polymerization in which carbon monoxide and olefin are carried out in an alcohol solvent through a catalyst composition composed of a palladium compound, an acid having 6 or less of PKa, and a ligand compound of phosphorus can be employed. The polymerization temperature is preferably from 50 to 100 ° C. and the reaction pressure is from 40 to 60 bar. The 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.

This is preferred as palladium acetate and a palladium compound in the amount of 10 ^-3 to ^10-2 1mole preferred. Specific examples of the acid having a pKa value of 6 or less include trifluoroacetic acid, p-toluenesulfonic acid, sulfuric acid, and sulfonic acid. In the present invention, trifluoroacetic acid is used and its amount is preferably 6 to 20 equivalents based on palladium. ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene)) bis (bis (2-methoxyphenyl) phosphine) is preferable as the two- , And the amount to be used is preferably 1 to 1.2 equivalents based on palladium.

2. Polyketone polymerization process

Hereinafter, the polymerization process of the polyketone resin will be described in detail.

The repeating unit derived from carbon monoxide, an ethylenically unsaturated compound and one or more olefinically unsaturated hydrocarbon compounds, three or more copolymers, particularly repeating units derived from carbon monoxide, and ethylenically unsaturated compounds and repeating units derived from propylenically unsaturated compounds are substantially Are excellent in mechanical properties and thermal properties, excellent in processability, high in abrasion resistance, chemical resistance and gas barrier property, and are useful materials for various applications. It is considered that the high molecular weight product of the copolymerized polyketone having three or more members is more useful as an engineering plastic material having higher workability and thermal properties and having excellent economy. Particularly, it has high abrasion resistance and can be used in light gasoline tanks because of high gas barrier properties such as parts of gears of automobiles, high chemical resistance, and lining materials of chemical transport pipes. In the case of using an ultrahigh molecular weight polyketone having an intrinsic viscosity of 2 or more as the fiber, it is possible to conduct stretching at a high magnification and to have a high strength and a high modulus of elasticity oriented in the stretching direction as belts, reinforcements of rubber hoses, tire cords, And is suitable for use in building materials and industrial materials.

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 deteriorate 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.

      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.

  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.

 As the polymerization method, a solution polymerization method using a liquid medium, a suspension polymerization method, a vapor phase polymerization method in which a small amount of a polymer is impregnated with a high concentration catalyst solution, and the like are used. The polymerization may be either batchwise or continuous. The reactor used in the polymerization can be used as it is or in a known manner. The polymerization temperature is not particularly limited, and is generally 40 to 180 占 폚, preferably 50 to 120 占 폚. The pressure at the time of polymerization is not particularly limited, but is generally from normal pressure to 20 MPa, preferably from 4 to 15 MPa.

 Particularly preferred are polyketone polymers having a number average molecular weight of from 100 to 200,000, especially from 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 (Hexafluoroisopropylalcohol) at 60 DEG C using a standard tubular viscosity measuring device is 0.5 dl / g to 10 dl / g, and preferably 1 dl / g to 2 dl / g. If the polymer has an intrinsic viscosity of less than 0.5, the mechanical and chemical properties peculiar to the polyketone are deteriorated. If the intrinsic viscosity exceeds 10, the moldability is poor.

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 molecular weight distribution is less than 1.5, the polymerization yield decreases. When the molecular weight distribution 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.

A linear alternating polyketone is formed by the polymerization method as described above.

3. Polyketone copolymer having y / x of 0.03 to 0.3

X and y in the following general formula represent the respective mol% in the polymer.

- (CH2CH2-CO) x- General formula (1)

- (CH2CH (CH3) -CO) y- < / RTI >

As the copolymer comprising repeating units represented by the general formulas (1) and (2) of the present invention, y / x is preferably 0.03 to 0.3. When the value of the y / x value is less than 0.05, there is a limit in that the meltability and processability are inferior. When the value is more than 0.3, the mechanical properties are poor. Further, y / x is more preferably 0.03 to 0.1. In addition, the melting point of the polymer can be controlled by controlling the ratio of ethylene to propylene in the polyketone polymer. For example, when the molar ratio of ethylene: propylene: carbon monoxide is adjusted to 46: 4: 50, the melting point is about 220 ° C, while the melting point is adjusted to 235 ° C when the molar ratio is adjusted to 47.3: 2.7: 50.

4. Example

Hereinafter, the constitution and effects of the present invention will be described in detail with reference to specific examples and comparative examples. However, these examples are merely intended to clearly understand the present invention and are not intended to limit the scope of the present invention. The present invention will be described in detail with reference to the following non-limiting examples.

Example 1

The linear alternating polyketone terpolymer of carbon monoxide and ethylene and propene is prepared by reacting palladium acetate, trifluoroacetic acid and ((2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Bis (2-methoxyphenyl) phosphine). The molar ratio of ethylene to propene in the polyketone terpolymer prepared above was 46 to 4. The melting point of the polyketone terpolymer was 220 占 폚, the LVN measured at 25 占 폚 in hexafluoroisopropanol (HFIP) was 2.0 dl / g, the MI index was 6 g / 10 min and the molecular weight distribution (MWD) 2.0. The polyketone terpolymer prepared above was injection-molded into a pellet on an extruder using a twin screw having a diameter of 2.5 cm and L / D = 32 operating at 250 rpm to prepare a specimen for an automobile fuel tank And the properties were evaluated by the following methods in comparison with the products of Comparative Examples 1 and 2, and the results are shown in Table 1 below.

Example 2

The same as Example 1 except that the inherent viscosity of the polyketone terpolymer was adjusted to 1.1.

Example 3

The same as Example 1 except that the intrinsic viscosity of the polyketone terpolymer was adjusted to 1.4.

Example 4

The same as Example 1 except that the molecular weight distribution of the polyketone terpolymer was adjusted to 1.8.

Example 5

The same as Example 1 except that the molecular weight distribution of the polyketone terpolymer was adjusted to 2.2.

Comparative Examples 1 to 2

Instead of the polyketone terpolymer, pellets of HDPE and EVOH and pellets of HDPE pellets were injection molded to prepare specimens for automobile fuel tanks. The properties were evaluated by the following methods, and the results are shown in Table 1 below .

Property evaluation

The pellets prepared in Example 1 were injection-molded to prepare specimens for automobile fuel tanks. The properties of the specimens were evaluated in the following manner in comparison with the products of Comparative Examples 1 and 2, and the results are shown in the following Table 1 .

1. Gas flow resistance (gas permeability coefficient): measured at 23 ℃, 50% RH

2. Evaluation of Impact Strength: Performed according to ASTM D256.

division unit Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 rescue - Polyketone (5T) Polyketone (5T) Polyketone (5T) Polyketone (5T) Polyketone (5T) HDPE-EVOH-HDPE (2T-1T-2T) HDPE (5T) Transmission coefficient (Fuel C)
g · mm / m ² · day 0.005 0.008 0.007 0.006 0.009 0.012 35 Permeability coefficient
(Fuel C + 15% MeOH) g · mm / m ² · day 2 5 3 4 6 10 35 Impact strength (room temperature) kJ / m ² 18.0 17.0 17.4 16.9 17.8 16.0 40.0 Impact strength (-40 ℃) kJ / m ² 10.0 9.5 9.8 8.9 9.7 8.0 9.0

According to the above Table 1, the gas-permeability of the Examples was lower than that of Comparative Example, and the impact strength was also excellent at both the room temperature and the low temperature. Therefore, the specimen manufactured by the embodiment of the present invention is suitable for use as a fuel tank for an automobile.

Claims (5)

A polyketone copolymer comprising repeating units represented by the following general formulas (1) and (2), which is produced by injection molding a polyketone copolymer having y / x of 0.03 to 0.3. .
- (CH2CH2-CO) x- (1)
- (CH2CH (CH3) -CO) y- (2)
(x and y are mole% of each of the general formulas (1) and (2) in the polymer)
The method of claim 1,
Wherein the polyketone copolymer has an intrinsic viscosity of 1.0 to 2.0 dl / g.
The method of claim 1,
In the polymerization of the polyketone copolymer, the ligand of the catalyst composition is selected from the group consisting of bis (2,2-dimethyl-1,3-dioxane-5,5-diyl) bis (methylene) Pin).
The method of claim 1,
Wherein the fuel tank has a gas permeability coefficient of 0.01 g · mm / m ² · day or less at 23 ° C., 50% relative humidity and filled with fuel.
The method of claim 1,
Wherein the fuel tank has a gas permeability coefficient of 5 g · mm / m ² · day or less at 23 ° C., 50% relative humidity, and filled with fuel and 15% methanol.