KR102020606B1 - Long fiber reinforced thermoplastic resin composition having excellent weatherability and article comprising the same - Google Patents

Abstract

The present invention relates to a long fiber-reinforced thermoplastic resin composition excellent in weather resistance and a molded article comprising the same, and more particularly, long fiber reinforcement that can achieve excellent mechanical properties and weather resistance at the same time by using long fibers in the polyamide resin composition A thermoplastic resin composition and molded article thereof.

Description

Long fiber reinforced thermoplastic resin composition having excellent weatherability and article comprising the same}

The present invention relates to a long fiber-reinforced thermoplastic resin composition excellent in weather resistance and a molded article comprising the same, and more particularly, long fiber reinforcement that can achieve excellent mechanical properties and weather resistance at the same time by using long fibers in the polyamide resin composition A thermoplastic resin composition and molded article thereof.

High efficiency, one of the top concerns of the 21st century, is affecting the entire industry, leading to rapid technological development. This usually means an increase in mechanical efficiency, but by applying a lightweight material showing high physical properties can be expected to increase efficiency through weight reduction. This is a trend that is rapidly being applied throughout the industry.

As polymer materials have become increasingly functional, functional and diversified, certain industries have been able to replace metals. However, in order to realize a performance that cannot be expressed by the polymer material alone, the development of a long fiber reinforced thermoplastic resin (LFT), which is a high impact and high rigidity composite material, has been made.

Recently, the development of LFT processing technology enables complex mold design, mechanical properties are also improved, and research on metal replacement of LFT materials is being actively conducted. Recently, door modules, carriers, armrests and sunroof frames, which are automotive parts, are being replaced by LFTs.

If LFT is replaced with automotive parts, it is possible not only to reduce the weight but also to mass produce complex parts through mold design. Modular parts with injection molding also allow integration of parts. Modularization is the core of the automotive industry in recent years, and it is a problem that is being developed in each automobile industry. For this reason, the use of LFT is expected to expand gradually.

According to the various industrial issues described above, research on high rigidity materials has been continuously conducted. For example, U.S. Patent Application Publication No. 2016-0222208 has applied a polyamide resin (PA6) having a number average molecular weight of about 50,000 in thermoplastic resins, but has added a fluidizing agent as an additive due to its poor fluidity.

Korean Unexamined Patent Publication No. 2013-0078776 introduces a polyamide resin composition having excellent strength, heat resistance, dimensional stability, and flame retardancy by adding glass short fibers, glass bubbles, and other flame retardants to a polyamide resin, which is a crystalline polymer in a thermoplastic resin. However, this is in the form of a short fiber reinforced resin composition, it is difficult to obtain the physical properties and lightening effect for the purpose due to the crushing of short fibers and glass bubbles in the process of melt kneading the polyamide resin and all additives through total mixing. In addition, in the case of using a large amount of additive to overcome this, excessive gas is generated in the molding process may be reduced workability.

In contrast to the LFT used in the existing industry, in order to be applied to automotive materials, not only excellent mechanical properties but also weather resistance must be improved. Therefore, the development of a long fiber reinforced thermoplastic resin composition that satisfies high rigidity, high impact and excellent weather resistance at the same time is required.

The present invention has been made to solve the above problems of the prior art, and implements both excellent mechanical and weather resistance properties, and at the same time high fiber impregnation characteristics in the drawing process by using a high-flow polyamide resin and a long fiber carbon reinforcement An object of the present invention is to provide a long fiber reinforced thermoplastic resin composition and a molded article including the same.

One aspect of the present invention to solve the above technical problem, (A) 30 to 80 parts by weight of a polyamide resin having a number average molecular weight (Mn) of 7,000 to 17,000 based on a total of 100 parts by weight of the resin composition, (B) carbon black A long fiber reinforced thermoplastic resin composition comprising 0.5 to 9.5 parts by weight of a master batch, (C) 2 to 18 parts by weight of an impact modifier, (D) 0.1 to 2.8 parts by weight of a heat stabilizer, and (E) 12 to 48 parts by weight of carbon long fibers. To provide.

According to another aspect of the present invention, there is provided a molded article comprising the long fiber reinforced thermoplastic resin composition. In one embodiment, the molded article may be an automotive part, an electrical product, an electronic product or an LED lighting product.

Since the long fiber reinforced thermoplastic resin composition according to the present invention exhibits high fiber strength and chemical resistance, excellent fiber impregnation and productivity, and a low manufacturing cost, the long fiber reinforced thermoplastic resin composition can be used to make a low pressure / injection molded article exhibiting excellent weathering properties. The molded article can be used in various fields such as automobile parts, electric parts and electronic parts.

Hereinafter, the present invention will be described in more detail.

In the present invention, "part by weight" means a weight ratio.

In the present invention, the long fiber-reinforced thermoplastic resin composition is a fiber "coated" with a molten mixture in the impregnating tank by placing carbon long fibers as a reinforcing agent in a drawing molding apparatus and passing them through an impregnation tank in which the remaining composition components are melted. It means. The long fiber reinforced thermoplastic resin composition is finally prepared in the form of pellets of, for example, 5 to 30 mm in length, and the long fibers are reinforced in parallel to the longitudinal direction of the pellets.

(A) polyamide resin

The resin composition of this invention contains a polyamide resin whose number average molecular weight (Mn) is 7,000-17,000 as a basic resin component.

The number average molecular weight (Mn) of the polyamide resin is preferably 9,000 to 14,000, more preferably 10,000 to 13,000, even more preferably 11,000 to 12,000. When the number average molecular weight of the polyamide resin is less than 7,000, it is difficult to secure mechanical properties, and when it exceeds 17,000, fluidity and weather resistance may be reduced.

The kind of the polyamide resin is not particularly limited, and polyamide resins commonly used in the art may be used without limitation, and preferably, the polyamide resin may be a polyamide resin including the structure of Formula 1 as a repeating unit.

[Formula 1]

In Formula 1, n is an integer of 60 to 150, more preferably an integer of 80 to 125.

In one embodiment of the present invention, the polyamide resin may be used by the condensation polymerization of lactam (lactam), w-amino acid or two or more of them, diacids and diamine (diamine) ) Can be used as a monomer.

As the polyamide resin, homopolyamide, copolyamide or a mixture thereof can be used. In addition, the polyamide resin may be a crystalline, semicrystalline or amorphous resin.

In one embodiment of the present invention, the polyamide resin is specifically, poly hexamethylenediamine adiamide (nylon 6,6), polyhexamethylenediamine seba amide (nylon 6,10), polyhexamethylene lauroamide (Nylon 6,12), polytetramethylenediamine adiamide (nylon 4,6), polycaprolactam (nylon 6), polylaurolactam (nylon 12) or mixtures thereof.

Within 100 parts by weight of the resin composition of the present invention, the polyamide resin may be included in an amount of 30 to 80 parts by weight, more preferably 35 to 75 parts by weight, even more preferably 40 to 70 parts by weight. have. If the content of the polyamide resin in 100 parts by weight of the resin composition is less than 30 parts by weight, there may be a problem that the processability and injection moldability is not secured, on the contrary, when the content of the polyamide resin is more than 80 parts by weight, the flexural strength and The additive content for improving mechanical properties such as impact strength or other physical properties such as weather resistance and thermal stability may be relatively reduced, which may cause a problem of deteriorating overall properties.

(B) Carbon Black Masterbatch

The resin composition of the present invention includes a carbon black master batch for improving weather resistance.

The carbon black master batch means a mixture in which carbon black is dispersed in a thermoplastic resin, preferably in the aforementioned polyamide resin. By using the carbon black masterbatch of the form which disperse | distributed carbon black to polyamide resin, carbon black can be disperse | distributed easily and weather resistance can be improved effectively.

The carbon black contained in the carbon black master batch is not particularly limited, and for example, Ketjenblack, acetylene black, channel black, or a combination thereof may be used. The particle diameter of the carbon black is preferably in the range of 10 nm to 40 nm. The nitrogen adsorption specific surface area (NSA) of the carbon black is not particularly limited, but is preferably 150 to 250 m ² / g, and more preferably 180 to 240 m ² / g. Here, nitrogen adsorption specific surface area (NSA) is the value which measured the nitrogen adsorption amount on the carbon black surface according to JISK6217-2: 2001 "Part 2: Obtaining specific surface area-nitrogen adsorption method-endpoint method".

The carbon black content in the carbon black master batch may be 10 to 40 parts by weight, preferably 15 to 40 parts by weight, even more preferably 15 to 30 parts by weight, based on 100 parts by weight of the master batch. Based on 100 parts by weight of the carbon black master batch, if the carbon black content is less than 10 parts by weight, the carbon black content is too small to expect a synergistic effect of weather resistance, and if it exceeds 40 parts by weight, workability may be poor.

Within 100 parts by weight of the resin composition of the present invention, the carbon black master batch is included in an amount of 0.5 to 9.5 parts by weight, more preferably 1 to 9 parts by weight, even more preferably 1.5 to 8.5 parts by weight. Can be. When the content of the carbon black master batch in 100 parts by weight of the resin composition is less than 0.5 parts by weight, the weather resistance improving effect may be insignificant. On the contrary, when the content of the carbon black master batch is more than 9.5 parts by weight, mechanical properties may be reduced.

(C) impact Reinforcement

The resin composition of the present invention includes an impact modifier to improve impact resistance in mechanical properties.

As the impact modifier, a core-shell type copolymer or a polymer in chain form may be used alone or in combination of two or more thereof. Specifically, as the impact modifier, an acrylic impact modifier, an olefin impact modifier, a methyl methacrylate-butadiene-styrene impact modifier, a styrene-ethylene-butadiene-styrene impact modifier, a silicone impact modifier, a polyester System elastomeric impact modifiers, or combinations thereof, may be used. In one embodiment, the impact modifier may preferably be an acrylic impact modifier, more preferably a core-shell type acrylic impact modifier.

Core-shell type acrylic impact when compared to core-shell type methacrylate-butadiene-styrene (MBS) -based impact modifiers commonly used in polycarbonate resin compositions The reinforcing agent has a relatively higher color reproducibility and thermal stability than the MBS-based impact reinforcing agent having a butadiene rubber structure core, and has advantages such as shortening the cycle time during injection molding. The acrylic material used as the core of the core-shell type acrylic impact modifier is not particularly limited, but may be ethylacryl rubber, butylacryl rubber or a combination thereof, preferably butylacryl rubber, The diameter can be 200 to 350 nm. The acrylic material used as the shell of the core-shell type acrylic impact modifier is not particularly limited, but may be styrene-acrylonitrile, polymethyl methacrylate, or a combination thereof, and preferably polymethyl methacrylate. have.

In one embodiment of the invention, the impact modifier may generally be a grafted polymer or metal ionomer.

Within 100 parts by weight of the resin composition of the present invention, the impact modifier may be included in an amount of 2 to 18 parts by weight, more preferably 4 to 17 parts by weight, even more preferably 5 to 16 parts by weight. . When the content of the impact modifier in 100 parts by weight of the resin composition is less than 2 parts by weight, the impact strength improvement effect of the resin composition may be insignificant. On the contrary, when the content of the impact modifier is more than 18 parts by weight, the impact strength is no longer improved. Without this, mechanical properties may be degraded.

(D) heat stabilizer

The resin composition of the present invention contains a heat stabilizer for improving weather resistance.

In general, primary antioxidants are designed to absorb radicals. In addition, a secondary antioxidant to which phenol, sulfur, or phosphorus is applied may be used in combination to improve processing stability of the primary antioxidant and to apply harsh processing conditions. In the present invention, a heat stabilizer is used to play a role similar to that of the secondary antioxidant. Although the kind of heat stabilizer is not specifically limited, Preferably, an iodine type compound can be used.

Within 100 parts by weight of the resin composition of the present invention, the heat stabilizer may be included in an amount of 0.1 to 2.8 parts by weight, more preferably 0.1 to 2.5 parts by weight, even more preferably 0.1 to 2.2 parts by weight. . When the content of the heat stabilizer in 100 parts by weight of the resin composition is less than 0.1 part by weight, the effect of improving the weather resistance due to the addition of the heat stabilizer may be insignificant. On the contrary, when the content of the heat stabilizer is more than 2.8 parts by weight, mechanical properties may be deteriorated. .

(E) carbon Long fiber

The resin composition of this invention contains carbon long fiber as a reinforcing agent.

The long carbon fiber may have a length of 5 to 30 mm, preferably 10 to 25 mm, more preferably 15 to 20 mm, and various lengths may be used depending on the purpose of use.

The carbon long fibers may be surface treated, and as the surface treating agent, silane-based or titanate-based low molecular weight or high molecular weight polymers are commonly used. At least one of the surface treatment agents is preferably a surface treatment agent having good affinity with the thermoplastic resin, and can be continuously impregnated into the thermoplastic resin by various known methods such as a melt impregnation method and a powder charging method.

The long carbon fiber may be concentrated with a urethane resin.

Although not particularly limited, in the present invention, in consideration of mass productivity and efficiency, a long fiber reinforced thermoplastic resin composition may be manufactured and used in pellet form using a pultrusion method. For example, the thermoplastic resin composition is introduced into a resin injection portion of a pultrusion apparatus, and the carbon long fibers in the form of lobes are impregnated through a process of pulling and squeezing while passing through a die, and in the impregnated state, continuous strands. The long fiber reinforced thermoplastic resin composition may be prepared in pellet form by cooling by pultrusion and cutting into pellets. That is, in one embodiment, the resin composition of the present invention is prepared in the form of pellets, the carbon long fibers are arranged parallel to the longitudinal direction of the pellets, the length of the carbon long fibers and the length of the pellets, for example, 5 to May be equal to 30 mm.

Within 100 parts by weight of the resin composition of the present invention, the carbon long fibers are included in an amount of 12 to 48 parts by weight, more preferably 15 to 45 parts by weight, even more preferably 18 to 40 parts by weight. have. When the content of the carbon long fiber in the resin composition is less than 12 parts by weight, the effect of improving mechanical rigidity may be insignificant. On the contrary, when the content of the carbon long fiber is more than 48 parts by weight, impact modifiers, heat stabilizers, and the like. Since the input amount of the additive is limited, impact resistance and weather resistance may be lowered, workability may be deteriorated, and carbon long fibers may be derived from the thermoplastic resin surface, or dispersion of carbon long fibers in the injection molded article may be uneven.

(F) any other additional ingredients

In addition to the above-described components, other additives may be added to the resin composition of the present invention as needed within the range capable of achieving the object of the present invention.

The kind of the other additives is not particularly limited, and additives conventionally used in thermoplastic resin compositions may be used without limitation, and for example, an additive selected from a compatibilizer, an antioxidant, a lubricant, or a mixture of two or more thereof may be used. It can be used above.

The content of the other additives is not particularly limited, and may be used in an amount of up to 15 parts by weight, for example, in the range of about 7 to 13 parts by weight, based on 100 parts by weight of the total resin composition of the present invention, depending on the purpose and purpose of use.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, these examples are only for the understanding of the present invention, and the scope of the present invention in any sense is not limited to these examples.

[ Example  And Comparative example ]

The components used in the present Example and the comparative example are specifically as follows.

(A-1) polyamide resin

Polyamide 6 resin with a relative viscosity of 2.2 and a number average molecular weight of 11,500 for sulfuric acid solvents

(A-2) polyamide resin

 Polyamide 6 resin with a relative viscosity of 2.2 and a number average molecular weight of 18,000 for sulfuric acid solvents

(B-1) carbon black

Raven 2350 Ultra (Birla Carbon) (NSA surface area: 203 m ² / g, average particle diameter: 15 nm)

(B-2) Carbon Black Masterbatch

It was produced by dispersing the above-mentioned (B-1) carbon black in the above-mentioned (A-1) polyamide 6 resin, and the weight ratio of (A-1) polyamide 6 resin: (B-1) carbon black was 70: As a carbon black master batch of 30, it was specifically prepared as follows.

After the above-mentioned (A-1) polyamide 6 resin was pulverized, the pulverized (A-1) polyamide 6 resin and (B-1) carbon black at a weight ratio of 70:30, L / D = 48 and Φ = The extruded strand was extruded in water in a 25 mm twin screw melt kneading extruder under a melt temperature of 230 to 250 ° C., a screw rotational speed of 150 rpm, a first vent pressure of about -600 mmHg and a self feeding rate of 20 kg / h. After cooling, the carbon black master batch was produced by cutting with a rotary cutter.

(C) impact Reinforcement

Anhydride modified ethylene copolymer (bulk density: 0.9 g / cm ³ , melt index: 1.6 g / min, 190 ^o C temperature and 2.16 kg loading conditions)

(D) Heat stabilizer

CuI (Incasa) (Cuprous Iodide)

KI (Incasa) (Potassium Iodide)

(E-1) carbon Long fiber

PAN-based carbon long fiber tow having a diameter of 5 to 10 탆, a length of 15 to 20 mm, concentrated with urethane resin, and having a filament number 12,000.

(E-2) glass Long fiber

Glass filament tow with filament number 2,000, 10-15 탆 in diameter, focused with epoxy resin and surface-treated with silane

(E-3) carbon Short fibers

PAN-based short carbon fibers having a diameter of 5 to 10 µm, a length of 3 to 6 mm, concentrated with urethane resin, and having a filament number 12,000

(E-4) glass Short fibers

Short glass fibers with filament number 3,500 10-14 μm in diameter, 2-4 mm in length, surface-treated with silane

(F) other additives

Acrylonitrile-butadiene-styrene copolymer (bulk density: 1.03 g / cm ³ , Melting Temperature Range: 230 ~ 260 ℃)

Hydroxyphenyl benzotriazole (bulk density: 1.22 g / cm ³ , Melting Temperature Range: 137 ~ 141 ℃)

1,6-hexanediamine and N, N-bis (2,2,6,6-tetramethyl-4-piperidinyl) -polymer (bulk density: 1.01 g / cm ³ , Melting Temperature Range: 120 ~ 150 ℃)

Tris (2,4-di-tert-butylphenyl) phosphite (bulk density: 1.03 g / cm ³ , Melting Temperature Range: 183 ~ 186 ℃)

N, N-hexane-1,6-diylbis (3- (3,5-di-tert-butyl-4-hydroxyphenyl propionamide)) (bulk density: 1.04 g / cm ³ , Melting Temperature Range: 156 ~ 161 ℃)

The polyamide resin, carbon black master batch or carbon black, heat stabilizer, impact modifier and other additives in the biaxial melt kneading extruder with L / D = 48 and Φ = 25 mm as components and contents of Examples and Comparative Examples shown in Table 1 below The extrusion was performed under conditions of a melting temperature of 230 to 250 ^° C., a screw rotational speed of 150 rpm, a first vent pressure of about −600 mmHg, and a self feeding rate of 20 kg / h. The extruded strand was cooled in water and then cut with a rotary cutter to prepare a master batch.

Thereafter, the master batch made of polyamide resin was added to the resin injection portion of the pultrusion apparatus by using the components and contents of the examples and comparative examples shown in Table 1 below, and passed through a die to form a carbon long fiber of a lobe shape ( E-1), long glass fibers (E-2), short carbon fibers (E-3) or short glass fibers (E-4) are impregnated through a process of pulling and squeezing, and the continuous phase in the impregnated state The strands were pultruded to cool and cut into 30 mm long pellets to form long fiber reinforced polyamide pellets.

The prepared long fiber reinforced polyamide pellets were hot-air dried at 80 ° C. to 100 ° C. for 4 hours, and then injection molded at a cylinder temperature of 250 ° C. to 270 ° C. and a mold temperature of 90 ° C. to prepare specimens. Physical properties were measured by the method specified below, and the results are shown in Table 2.

(1) Bulk density: measured according to ASTM B527.

(2) Tensile strength: measured according to ASTM D638.

(3) Flexural strength and flexural modulus: measured according to ASTM D790.

(4) Impact strength at room temperature and impact strength at low temperature: The impact strength was measured at room temperature and low temperature (-30 ° C.) according to ASTM D256.

(5) Heat distortion temperature: measured according to ASTM D648 (load conditions: 18.6kg _f / cm ² )

(6) Weatherability: Request for external test (Korea Institute of Construction & Environmental Testing)

Testing under SAE J 1960 under a wavelength of 340 nm and light dosage conditions of 2500 KJ / m ² . Specifically, after irradiating light under the above conditions, the color change of the specimen was measured by using a color difference meter, and the color difference (ΔE) was calculated by the following equation, and the lower the color difference (ΔE value), especially when it is 3 or less, weather resistance This can be seen as excellent.

ΔE (L *, a *, b *) = {( ΔL *) ² + ( Δa *) ² + (Δb *) ² } ^1/2

(7) Extrusion processability: Relative evaluation was made according to the following criteria according to the degree of breaking of the strands during the master batch production.

As can be seen from Table 2, the resin composition according to the embodiment of the present invention has mechanical properties such as tensile strength, flexural properties (flexural strength and flexural modulus), room temperature impact strength, and low temperature impact strength, compared to the resin composition shown in the comparative example. Excellent balance of physical properties in both heat resistance, weather resistance and extrusion processability.

On the other hand, in the case of Comparative Example 1 it can be seen that the overall physical properties are lowered due to the low molecular weight polyamide extruded, in the case of Comparative Example 2 is added to the carbon black rather than the masterbatch form to reduce the overall dispersibility A decrease in mechanical properties can be seen. In Comparative Example 3, carbon black was not added, so the weather resistance was greatly reduced, and in Comparative Example 4, the master batch was added in an excessive amount, thereby reducing the overall mechanical properties compared to Example 1, and it was confirmed that continuous extrusion processing was not suitable. Comparative Example 5 shows the result that the impact strength is not added because the impact modifier is added, on the contrary, Comparative Example 6 is not suitable for the implementation of high impact and high stiffness product due to the addition of an excessive amount of the impact modifier to reduce the bending characteristics. In Comparative Example 7 without the addition of a heat stabilizer, the thermal stability was greatly reduced. In contrast, Comparative Example 8, in which an excessive amount of the heat stabilizer was added, showed a decrease in overall mechanical properties. Comparative Example 9, which does not include carbon long fibers, showed a large decrease in all properties compared to Example 1, and in contrast, Comparative Example 10, in which an excessive amount of carbon long fibers were added, confirmed overall decrease in physical properties and degradation of extrusion processability. Comparative Example 11 and Comparative Example 13 using glass reinforcement showed overall lower mechanical properties compared to Example 1 using carbon long fiber reinforcing agent, and also compared to Example 1 of Comparative Example 12 using carbon short fiber reinforcing agent. Physical properties were shown. Comparative Example 14, in which the carbon long fiber reinforcing agent was added in less than 12 parts by weight, also showed low overall mechanical properties.

Claims (12)

Based on 100 parts by weight of the total resin composition,
(A) 30 to 80 parts by weight of a polyamide resin having a number average molecular weight (Mn) of 10,000 to 17,000,
(B) 0.5 to 9.5 parts by weight of the carbon black master batch,
(C) 2 to 18 parts by weight of the impact modifier,
(D) 0.1 to 2.8 parts by weight of heat stabilizer and
(E) 12 to 48 parts by weight of carbon long fiber,
Long fiber reinforced thermoplastic resin composition. The long fiber reinforced thermoplastic resin composition according to claim 1, wherein the number average molecular weight (Mn) of the polyamide resin (A) is 10,000 to 14,000. The polyamide resin according to claim 1, wherein the polyamide resin (A) is a polyhexamethylenediamine adipamide (nylon 6,6), polyhexamethylenediamine sebaamide (nylon 6,10), polyhexamethylene lauroamide (nylon 6). , 12), polytetramethylenediamine adipamide (nylon 4,6), polycaprolactam (nylon 6), polylaurolactam (nylon 12) or a mixture thereof. The long fiber reinforced thermoplastic resin composition according to claim 1, wherein the (B) carbon black master batch is a mixture of polyamide resin and carbon black. The long fiber reinforced thermoplastic resin composition according to claim 4, wherein the content of the carbon black is 10 to 40 parts by weight based on 100 parts by weight of the total (B) carbon black master batch. The impact modifier of claim 1, wherein the impact modifier (C) is an acrylic impact modifier, an olefinic impact modifier, a methylmethacrylate-butadiene-styrene impact modifier, a styrene-ethylene-butadiene-styrene impact modifier, a silicone impact modifier, a polyester The long-fiber reinforced thermoplastic resin composition selected from the group of elastomeric impact modifiers or mixtures thereof. The long fiber reinforced thermoplastic resin composition according to claim 1, wherein the heat stabilizer (D) is an iodine-based compound. The long fiber reinforced thermoplastic resin composition according to claim 1, wherein the (E) carbon long fiber is surface treated with a silane-based or titanate-based polymer. The resin composition according to claim 1, wherein the resin composition is prepared in pellet form, (E) carbon long fibers are arranged parallel to the longitudinal direction of the pellets, and (E) the length of the carbon long fibers and the length of the pellets are 5 to 30 mm. The same as, long fiber reinforced thermoplastic resin composition. The long fiber reinforced thermoplastic resin composition of claim 1, further comprising an additive selected from the group consisting of compatibilizers, antioxidants, lubricants or mixtures thereof. A molded article comprising the long fiber reinforced thermoplastic resin composition according to any one of claims 1 to 10. The molded article according to claim 11, which is an automotive part, an electrical product, an electronic product or an LED lighting product.