Polyamide resin composition and article produced therefrom

Abstract

A polyamide resin composition of the present invention comprises: approximately 100 parts by weight of a base material comprising approximately 20-60 wt% of an amorphous polyamide resin, approximately 10-40 wt% of a semi-crystalline polyamide resin, and approximately 10-50 wt% of glass fiber; approximately 10-30 parts by weight of a maleic anhydride-modified rubbery polymer; and approximately 0.1-4 parts by weight of talc, wherein the weight ratio of the maleic anhydride-modified rubbery polymer and the talc is approximately 1: 0.01 to 1: 0.3. The polyamide resin composition has excellent impact resistance, flowability, appearance characteristics, a balance of such physical properties, and the like.

Description

Polyamide resin composition and molded article manufactured therefrom

[0001] The present invention relates to a polyamide resin composition and a molded article manufactured therefrom. More specifically, the present invention relates to a polyamide resin composition having excellent impact resistance, fluidity, appearance characteristics, and a balance of these physical properties, and a molded article manufactured therefrom.

[0002]

[0003] Polyamide resin boasts excellent processability, impact resistance, and mechanical properties, making it useful for housings for various electrical and electronic devices, as well as for interior and exterior automotive materials. Furthermore, with the trend toward thinner and lighter materials, polyamide resin is being blended with inorganic reinforcing agents like glass fiber to further enhance properties like rigidity and heat resistance, leading to its application in interior and exterior materials for electrical and electronic devices.

[0004] Wearable device materials, for which demand is growing, require superior aesthetic properties in addition to mechanical properties such as impact resistance. Crystalline polyamide resins have limitations in achieving impact resistance, and their injection moldability is inferior to that of other long-chain polyamide resins. To address this issue, research has been conducted to improve impact resistance and injection moldability by incorporating amorphous polyamide resins into crystalline polyamide resins. However, the application of amorphous polyamide resins presents a drawback: it is difficult to achieve high aesthetic properties.

[0005] Therefore, there is a need to develop a polyamide resin composition with excellent impact resistance, fluidity (injection properties), appearance characteristics, and a balance of these properties.

[0006] The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2017-0024201, etc.

[0007]

[0008] The purpose of the present invention is to provide a polyamide resin composition having excellent impact resistance, fluidity, appearance characteristics, and a balance of these physical properties.

[0009] Another object of the present invention is to provide a molded product formed from the polyamide resin composition.

[0010] The above and other objects of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a polyamide resin composition. The polyamide resin composition comprises: about 100 parts by weight of a base material comprising about 20 to about 60 wt% of an amorphous polyamide resin, about 10 to about 40 wt% of a semi-crystalline polyamide resin, and about 10 to about 50 wt% of glass fiber; about 10 to about 30 parts by weight of a maleic anhydride-modified rubbery polymer; and about 0.1 to about 4 parts by weight of talc; wherein a weight ratio of the maleic anhydride-modified rubbery polymer and the talc is about 1:0.01 to about 1:0.3.

[0013] 2. In the above 1 specific example, the amorphous polyamide resin may include at least one of polyamide MACM10, polyamide MACM12, polyamide MACM14, polyamide PACM10, polyamide PACM12, and polyamide PACM14.

[0014] 3. In the above 1 or 2 specific examples, the semi-crystalline polyamide resin may include at least one of polyamide 6, polyamide 6 / 6, polyamide 6 / 12, polyamide 11, polyamide 12, and polyamide 10 / 12.

[0015] 4. In the above 1 to 3 specific examples, the glass fiber may be a circular cross-section glass fiber with a cross-sectional diameter of about 5 to about 20 ㎛.

[0016] 5. In the above 1 to 4 specific examples, the maleic anhydride-modified rubber polymer may include at least one of a maleic anhydride-modified olefin-based elastomer and a maleic anhydride-modified styrene-based elastomer.

[0017] 6. In the above 1 to 5 specific examples, the maleic anhydride-modified olefin elastomer may include at least one of an ethylene-propylene copolymer in which maleic anhydride is graft-polymerized, an ethylene-1-butene copolymer in which maleic anhydride is graft-polymerized, and an ethylene-1-octene copolymer in which maleic anhydride is graft-polymerized.

[0018] 7. In the above 1 to 6 specific examples, the styrene-based and maleic anhydride-modified styrene-based elastomer may include at least one of a styrene-ethylene / butylene-styrene copolymer in which maleic anhydride is graft-polymerized, a styrene-ethylene-butylene copolymer in which maleic anhydride is graft-polymerized, a styrene-butadiene-styrene copolymer in which maleic anhydride is graft-polymerized, and styrene-ethylene / butadiene-styrene.

[0019] 8. In the above 1 to 7 specific examples, the weight ratio of the amorphous polyamide resin and the semi-crystalline polyamide resin may be about 1:0.1 to about 1:2.

[0020] 9. In the above 1 to 8 specific examples, the weight ratio of the glass fiber and the maleic anhydride modified rubber polymer may be about 1:0.1 to about 1:1.

[0021] 10. In the above 1 to 9 specific examples, the weight ratio of the glass fiber and the talc may be about 1:0.01 to about 1:0.2.

[0022] 11. In the above 1 to 10 specific examples, the polyamide resin composition may have a notched Izod impact strength of about 10 to about 30 kgf·cm / cm for a 1 / 8" thick specimen measured according to ASTM D256.

[0023] 12. In the above 1 to 11 specific examples, the polyamide resin composition may not cause cracks when a 1 kg or 500 g weight is dropped 10 times from a height of 1 m onto an injection molded specimen having a thickness of 1 mm, based on the DuPont drop measurement method.

[0024] 13. In the above 1 to 12 specific examples, the polyamide resin composition may have a melt flow index (MI) of about 10 to about 35 g / 10 min, measured at 250°C and 5 kgf according to ASTM D1238.

[0025] 14. In the above 1 to 13 specific examples, the polyamide resin composition may have a gloss of about 89 to about 95 GU of an injection-molded specimen measured at a reflection angle of 75° using a gloss meter.

[0026] 15. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a polyamide resin composition according to any one of 1 to 14.

[0027]

[0028] The present invention has the effect of providing a polyamide resin composition having excellent impact resistance, fluidity, appearance characteristics, and balance of physical properties thereof, and a molded article formed therefrom.

[0029]

[0030] Hereinafter, the present invention will be described in detail as follows.

[0031] A polyamide resin composition according to the present invention comprises (A) an amorphous polyamide resin; (B) a semi-crystalline polyamide resin; (C) glass fiber; (D) a maleic anhydride-modified rubber polymer; and (E) talc.

[0032] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0033]

[0034] (A) Amorphous polyamide resin

[0035] According to one specific example of the present invention, an amorphous polyamide resin can be applied together with a semi-crystalline polyamide resin, glass fiber, a maleic anhydride-modified rubber polymer, talc, etc., to improve the impact resistance, fluidity, appearance characteristics, and physical property balance of the polyamide resin composition, and a conventional amorphous polyamide resin can be used.

[0036] In a specific example, the amorphous polyamide resin may include an amorphous polyamide resin including a repeating unit derived from a cyclic aliphatic diamine and a repeating unit derived from an aliphatic dicarboxylic acid.

[0037] In this specification, the term dicarboxylic acid, etc. is used to mean dicarboxylic acid, its alkyl ester (lower alkyl ester having 1 to 4 carbon atoms such as monomethyl, monoethyl, dimethyl, diethyl or dibutyl ester), acid anhydride thereof, etc., and reacts with diamine to form a repeating unit derived from dicarboxylic acid (dicarboxylic acid moiety). In addition, in this specification, the dicarboxylic acid moiety and the repeating unit derived from diamine (diamine moiety) mean a residue remaining when a hydrogen atom (removed from an amine group), a hydroxyl group or an alkoxy group (removed from a carboxylic acid group) is removed when dicarboxylic acid and diamine undergo a polymerization reaction.

[0038] In a specific example, the cyclic aliphatic diamine may be a cyclic aliphatic diamine having 6 to 30 carbon atoms. For example, bis(p-amino-3-methyl-cyclohexyl)methane (MACM), 4,4'-diaminodicyclohexylmethane (PACM), etc. may be used.

[0039] In a specific example, the aliphatic dicarboxylic acid may be a linear aliphatic dicarboxylic acid having 10 to 14 carbon atoms. For example, dodecanedioic acid, decanoic acid, tetradecanoic acid, etc. may be used.

[0040] In a specific example, the amorphous polyamide resin may include at least one of polyamide MACM10, polyamide MACM12, polyamide MACM14, polyamide PACM10, polyamide PACM12, and polyamide PACM14.

[0041] In a specific example, the amorphous polyamide resin can be manufactured according to a conventional polyamide manufacturing method, and for example, can be manufactured by polymerizing a monomer mixture including the aliphatic dicarboxylic acid and the cyclic aliphatic diamine. Here, the polymerization can be performed according to a conventional polymerization method, and for example, can be performed using a melt polymerization method, etc., and the polymerization temperature can be about 80 to about 300°C, for example, about 90 to about 280°C, and the polymerization pressure can be about 10 to about 40 kgf / cm. 2 It may include, but is not limited to.

[0042] In a specific example, the molar ratio (diamine / dicarboxylic acid) of the repeating unit derived from the cyclic aliphatic diamine and the repeating unit derived from the aliphatic dicarboxylic acid may be about 0.95 to about 1.15, for example, about 1 to about 1.1. Within this range, it is possible to produce a polymer having a degree of polymerization suitable for molding, and to prevent deterioration of physical properties due to unreacted monomers.

[0043] In a specific example, the amorphous polyamide resin may be dissolved in a 98% sulfuric acid solution at a concentration of 0.5 g / dl and then have an intrinsic viscosity [η] measured at 25°C using an Ubbelodhde viscometer of about 0.5 to about 2.5 dL / g, for example, about 0.5 to about 2 dL / g. Within this range, the polyamide resin composition may have excellent fluidity (moldability), impact resistance, chemical resistance, and the like.

[0044] In a specific example, the amorphous polyamide resin may be included in an amount of about 20 to about 60 wt%, for example, about 35 to about 60 wt%, based on 100 wt% of the total base material including the amorphous polyamide resin, the semi-crystalline polyamide resin, and the glass fiber. When the content of the amorphous polyamide resin is less than about 20 wt%, based on 100 wt% of the base material, the impact resistance, fluidity, etc. of the polyamide resin composition may be reduced, and when it exceeds about 60 wt%, there is a concern that the fluidity, appearance characteristics, etc. of the polyamide resin composition may be reduced.

[0045]

[0046] (B) Semi-crystalline polyamide resin

[0047] A semi-crystalline polyamide resin according to one specific example of the present invention can be applied together with an amorphous polyamide resin, glass fiber, a maleic anhydride-modified rubber polymer, talc, etc., to improve the impact resistance, fluidity, appearance characteristics, and physical property balance of the polyamide resin composition, and a conventional semi-crystalline polyamide resin can be used.

[0048] In a specific example, the semi-crystalline polyamide resin may include an aliphatic polyamide resin, etc.

[0049] In a specific example, the semi-crystalline polyamide resin may include one or more of polyamide 6, polyamide 6 / 6, polyamide 6 / 12, polyamide 11, polyamide 12, and polyamide 10 / 12.

[0050] In a specific example, the semi-crystalline polyamide resin may have an intrinsic viscosity [η] measured according to ASTM D2857 of about 2.2 to about 3.0 dl / g, for example, about 2.45 to about 2.55 dl / g. Within this range, the moldability (fluidity) of the polyamide resin composition, the appearance of the injection-molded product, etc. may be excellent.

[0051] In a specific example, the semi-crystalline polyamide resin may be included in an amount of about 10 to about 40 wt%, for example, about 10 to about 35 wt%, based on 100 wt% of the total base material. If the content of the semi-crystalline polyamide resin is less than about 10 wt%, based on 100 wt% of the base material, the fluidity, appearance properties, etc. of the polyamide resin composition may deteriorate, and if it exceeds about 40 wt%, there is a concern that the impact resistance, fluidity, etc. of the polyamide resin composition may deteriorate.

[0052] In a specific example, the weight ratio of the amorphous polyamide resin and the semi-crystalline polyamide resin may be from about 1:0.1 to about 1:2, for example from about 1:0.15 to about 1:1.5. Within this range, the impact resistance, fluidity, appearance properties, etc. of the polyamide resin composition may be more excellent.

[0053]

[0054] (C) Glass fiber

[0055] According to one specific example of the present invention, glass fibers can be applied together with amorphous polyamide resins, semi-crystalline polyamide resins, maleic anhydride-modified rubber polymers, talc, etc. to improve the impact resistance, fluidity, appearance characteristics, and physical property balance of the polyamide resin composition, and glass fibers used in conventional thermoplastic resin compositions can be used.

[0056] In specific embodiments, the glass fibers may be in the form of fibers and may have various cross-sections, such as circular (including oval), rectangular, etc. For example, it may be preferable to use circular cross-section glass fibers in terms of mechanical properties.

[0057] In a specific example, the glass fibers of the circular cross-section may have a cross-sectional diameter of about 5 to about 20 µm as measured using a Scanning Electron Microscope (SEM) and a length before processing of about 2 to about 20 mm. Within this range, the rigidity, moldability, appearance characteristics, etc. of the polyamide resin composition may be improved.

[0058] In a specific example, the glass fiber may be treated with a conventional surface treatment agent. The surface treatment agent may include, but is not limited to, a silane compound, a urethane compound, an epoxy compound, or the like.

[0059] In a specific example, the glass fiber may be included in an amount of about 10 to about 50 wt%, for example, about 25 to about 35 wt%, based on 100 wt% of the total base material. If the content of the glass fiber is less than about 10 wt%, based on 100 wt% of the base material, the impact resistance, fluidity, etc. of the polyamide resin composition may be reduced, and if it exceeds about 50 wt%, there is a concern that the fluidity, appearance characteristics, etc. of the polyamide resin composition may be reduced.

[0060]

[0061] (D) Maleic anhydride modified rubber polymer

[0062] According to one specific example of the present invention, a maleic anhydride-modified rubber polymer can be applied together with an amorphous polyamide resin, a semi-crystalline polyamide resin, glass fiber, talc, etc., to improve the impact resistance, fluidity, appearance characteristics, and physical property balance of a polyamide resin composition, and a maleic anhydride-modified rubber polymer used in a typical thermoplastic resin composition can be used.

[0063] In a specific example, the maleic anhydride-modified rubber polymer may include at least one of a maleic anhydride-modified olefin-based elastomer and a maleic anhydride-modified styrene-based elastomer.

[0064] In a specific example, the maleic anhydride-modified rubber polymer may be a rubber polymer obtained by graft polymerizing maleic anhydride (MAH) onto an olefin-based rubber polymer.

[0065] In a specific example, the maleic anhydride-modified olefin elastomer may include at least one of an ethylene-propylene copolymer graft-polymerized with maleic anhydride, an ethylene-1-butene copolymer graft-polymerized with maleic anhydride, and an ethylene-1-octene copolymer graft-polymerized with maleic anhydride.

[0066] In a specific example, the maleic anhydride-modified styrene elastomer may be a styrene rubber polymer obtained by graft polymerizing maleic anhydride (MAH).

[0067] In a specific example, the styrenic elastomer and the maleic anhydride-modified styrenic elastomer may include at least one of a styrene-ethylene / butylene-styrene copolymer graft-polymerized with maleic anhydride, a styrene-ethylene-butylene copolymer graft-polymerized with maleic anhydride, a styrene-butadiene-styrene copolymer graft-polymerized with maleic anhydride, and styrene-ethylene / butylene-styrene.

[0068] In a specific example, the maleic anhydride-modified rubber polymer may have a maleic anhydride content of about 0.1 to about 3 wt%, for example, about 0.3 to about 1.5 wt%, based on 100 wt% of the total maleic anhydride-modified rubber polymer. Within this range, the polyamide resin composition may have excellent impact resistance, fluidity, appearance properties, and the like.

[0069] In a specific example, the maleic anhydride-modified rubber polymer may have a melt flow index of about 0.01 to about 40 g / 10 min, for example, about 0.1 to about 10 g / 10 min, measured under conditions of 190°C and 2.16 kgf according to ASTM D1238. Within this range, the polyamide resin composition may have excellent impact resistance, fluidity, etc.

[0070] In a specific example, the maleic anhydride-modified rubber polymer may be included in an amount of about 10 to about 30 parts by weight, for example, 12 to 20 parts by weight, based on about 100 parts by weight of the base material. If the amount of the maleic anhydride-modified rubber polymer is less than about 10 parts by weight based on about 100 parts by weight of the base material, there is a concern that the impact resistance, etc. of the polyamide resin composition may be reduced, and if it exceeds about 30 parts by weight, there is a concern that the fluidity, appearance characteristics, etc. of the polyamide resin composition may be reduced.

[0071] In a specific example, the weight ratio of the glass fiber and the maleic anhydride-modified rubber polymer may be from about 1:0.1 to about 1:1, for example from about 1:0.3 to about 1:0.7. Within this range, the impact resistance, fluidity, appearance properties, etc. of the polyamide resin composition may be more excellent.

[0072]

[0073] (E) Talk

[0074] According to one specific example of the present invention, talc can be applied together with amorphous polyamide resin, semi-crystalline polyamide resin, glass fiber, maleic anhydride-modified rubber polymer, etc., to improve the impact resistance, fluidity, appearance characteristics, and physical property balance of the polyamide resin composition, and talc used in a typical thermoplastic resin composition can be used.

[0075] In a specific example, the talc is a plate-shaped inorganic filler, and may have an average particle size of 0.5 to 10 μm, for example, 1 to 7 μm, as measured by a particle size measuring device (Malvern mastersizer 3000). Within this range, the appearance properties of the polyamide resin composition may be excellent.

[0076] In a specific example, the talc may be included in an amount of about 0.1 to about 4 parts by weight, for example, about 0.5 to about 3 parts by weight, relative to about 100 parts by weight of the base material. If the content of the talc is less than 0.1 parts by weight relative to about 100 parts by weight of the base material, there is a concern that the fluidity of the polyamide resin composition may deteriorate, and if it exceeds 4 parts by weight, there is a concern that the impact resistance, appearance characteristics, etc. of the polyamide resin composition may deteriorate.

[0077] In a specific example, the weight ratio of the maleic anhydride-modified rubber polymer and the talc may be from about 1:0.01 to about 1:0.3, for example, from about 1:0.03 to about 1:0.2. When the weight ratio of the maleic anhydride-modified rubber polymer and the talc is less than about 1:0.01, there is a concern that the fluidity, etc. of the polyamide resin composition may be reduced, and when it exceeds about 1:0.3, there is a concern that the impact resistance, appearance characteristics, etc. of the polyamide resin composition may be reduced.

[0078] In a specific example, the weight ratio of the glass fiber and the talc may be from about 1:0.01 to about 1:0.2, for example from about 1:0.015 to about 1:0.15. Within this range, the appearance properties, fluidity (injection moldability), etc. of the polyamide resin composition may be more excellent.

[0079]

[0080] A polyamide resin composition according to one specific embodiment of the present invention may further include additives included in conventional polyamide resin compositions. Examples of the additives include, but are not limited to, flame retardants, anti-drip agents, antioxidants, lubricants, release agents, nucleating agents, antistatic agents, stabilizers, pigments, dyes, and mixtures thereof. When the additives are used, the content thereof may be about 0.001 to about 40 parts by weight, for example, about 0.1 to about 10 parts by weight, based on about 100 parts by weight of the base material.

[0081]

[0082] A polyamide resin composition according to one specific example of the present invention may be in the form of pellets obtained by mixing the above components and melt-extruding them at about 220 to about 300°C, for example, about 250 to about 280°C, using a conventional twin-screw extruder.

[0083] In a specific example, the polyamide resin composition may have a notched Izod impact strength of about 10 to about 30 kgf·cm / cm, for example, about 12 to about 20 kgf·cm / cm, of a 1 / 8" thick specimen measured according to ASTM D256.

[0084] In a specific example, the polyamide resin composition may not cause cracks when a 1 kg or 500 g weight is dropped 10 times from a height of 1 m onto an injection molded specimen having a thickness of 1 mm, based on the DuPont drop measurement method.

[0085] In a specific example, the polyamide resin composition may have a melt-flow index (MI) of about 10 to about 35 g / 10 min, for example, about 15 to about 35 g / 10 min, measured under conditions of 250°C and 5 kgf according to ASTM D1238.

[0086] In a specific example, the polyamide resin composition may have a gloss of about 89 to about 95 GU, for example, about 89.5 to about 93 GU, of an injection-molded specimen measured at a reflection angle of 75° using a gloss meter (manufacturer: BYK Instruments, device name: micro gloss).

[0087]

[0088] The molded article according to the present invention is formed from the polyamide resin composition. The polyamide resin composition can be manufactured in the form of pellets, and the manufactured pellets can be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention pertains. The molded article has excellent impact resistance, fluidity (injection properties), appearance characteristics, and a balance of these physical properties, and is therefore useful as an outer material for wearable devices, etc.

[0089]

[0090] Hereinafter, the present invention will be described in more detail through examples; however, these examples are for the purpose of explanation only and should not be construed as limiting the present invention.

[0091]

[0092] Example

[0093] Below, the specifications of each component used in the examples and comparative examples are as follows.

[0094] (A) Amorphous polyamide resin

[0095] Polyamide MACM12 (manufacturer: Shandong-Dongchen, product name: TM03) formed from bis(p-amino-3-methyl-cyclohexyl)methane and dodecanedioic acid was used.

[0096] (B) Semi-crystalline polyamide resin

[0097] Polyamide 6 (PA6, manufacturer: KP Chemtech, product name: EN 300) was used.

[0098] (C) Glass fiber

[0099] Circular cross-section glass fiber (Manufacturer: Nippon Electric Glass, Product name: ECS 03 T-251H) was used.

[0100] (D) Maleic anhydride modified rubber polymer

[0101] An ethylene-propylene copolymer graft-polymerized with maleic anhydride (MAH-g-EPR, manufacturer: Mitsui Chemical, product name: Tafmer MH-7020) was used.

[0102] (E) Talk

[0103] Talc (Manufacturer: LIAONING XINDA, Product Name: TALC POWDER (DS-9276)) was used.

[0104]

[0105] Examples 1 to 9 and Comparative Examples 1 to 10

[0106] Each of the above components was added in the amounts shown in Tables 1, 2, 3, and 4 below, and then extruded at about 260°C to produce pellets. The extrusion was performed using a twin-screw extruder with an L / D of 29 and a diameter of 45 mm. The manufactured pellets were dried at about 80°C for about 4 hours, and then injection-molded using a 6 oz injection molding machine (molding temperature: about 270°C, mold temperature: about 60°C) to produce specimens. The physical properties of the manufactured specimens were evaluated using the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

[0107]

[0108] Method of measuring physical properties

[0109] (1) Notched Izod impact strength (unit: kgf·cm / cm): The notched Izod impact strength of a 1 / 8" thick specimen was measured according to ASTM D256.

[0110] (2) Impact resistance evaluation: Based on the DuPont drop measurement method, a 1 kg or 500 g weight was dropped 10 times from a height of 1 m onto an injection molded specimen with a thickness of 1 mm, and the occurrence of cracks was checked.

[0111] (3) Melt flow index (unit: g / 10 min): Melt flow index (MI) was measured at 250℃ and 5 kgf according to ASTM D1238.

[0112] (4) Gloss (unit: GU): For injection molded specimens measuring 100 mm × 100 mm × 3.2 mm, the gloss was measured at a reflection angle of 75° using a gloss meter (manufacturer: BYK Instruments, device name: micro gloss).

[0113]

[0114] Example 12345 (A) (% by weight) 60463548.543.5 (B) (% by weight) 10243526.521.5 (C) (% by weight) 3030302535 (D) (parts by weight) 1515151515 (E) (parts by weight) 11111 (D): (E) (weight ratio) 1:0.071:0.071:0.071:0.071:0.071:0.07 Notched Izod impact strength (kgf·cm / cm) 1212131214 Crack occurrence No occurrence No occurrence No occurrence No occurrence Melt flow index (g / 10 min) 1830343226 Gloss (GU) 90.891.191.491.689.7

[0115] * Weight parts: Weight parts per 100 weight parts of basic materials (A+B+C)

[0116]

[0117] Example 6789 (A) (% by weight) 46464646 (B) (% by weight) 24242424 (C) (% by weight) 30303030 (D) (parts by weight) 12201515 (E) (parts by weight) 110.53 (D): (E) (weight ratio) 1:0.08 1:0.05 1:0.03 0.2 Notched Izod impact strength (kgf·cm / cm) 12141214 Crack occurrence No occurrence No occurrence No occurrence Melt flow index (g / 10 min) 28333124 Gloss (GU) 90.690.890.490.1

[0118] * Weight parts: Weight parts per 100 weight parts of basic materials (A+B+C)

[0119]

[0120] Comparative Example 12345 (A) (Wt%) 156558.53546 (B) (Wt%) 55536.52024 (C) (Wt%) 303055530 (D) (Weight parts) 151515155 (E) (Weight parts) 11111 (D): (E) (Weight ratio) 1:0.07 1:0.07 1:0.07 1:0.07 1:0.2 Notched Izod impact strength (kgf·cm / cm) 15188168 Crack occurrence No occurrence No occurrence Melt flow index (g / 10 min) 4285424 Gloss (GU) 91.28 6.49 4.07 1.49 0.1

[0121] * Weight parts: Weight parts per 100 weight parts of basic materials (A+B+C)

[0122]

[0123] Comparative Example 678910(A) (Wt%) 4646464646(B) (Wt%) 2424242424(C) (Wt%) 3030303030(D) (Weight parts) 351515405(E) (Weight parts) 10.0150.14(D):(E) (Weight ratio) 1:0.031:0.0011:0.331:0.0031:0.8Notched Izod impact strength (kgf·cm / cm) 161413149Crack occurrenceNo occurrenceNo occurrenceNo occurrenceMelting flow index (g / 10 min) 4155184030Gloss (GU) 87.490.488.484.490.1

[0124] * Weight parts: Weight parts per 100 weight parts of basic materials (A+B+C)

[0125]

[0126] From the above results, it can be seen that the polyamide resin composition of the present invention is environmentally friendly by applying a certain amount or more of recycled raw material, and has excellent impact resistance (notched Izod impact strength, crack occurrence), fluidity (melt flow index), and appearance characteristics (glossiness), and a balance of these physical properties.

[0127] On the other hand, in the case of Comparative Example 1, where a small amount of amorphous polyamide resin was applied and an excessive amount of semi-crystalline polyamide resin was applied, it can be seen that impact resistance, fluidity, etc. were deteriorated, and in the case of Comparative Example 2, where an excessive amount of amorphous polyamide resin was applied and a small amount of semi-crystalline polyamide resin was applied, it can be seen that fluidity, appearance characteristics, etc. were deteriorated. In the case of Comparative Example 3, where a small amount of glass fiber was applied, it can be seen that impact resistance, fluidity, etc. were deteriorated, and in the case of Comparative Example 4, where an excessive amount of glass fiber was applied, it can be seen that fluidity, appearance characteristics, etc. were deteriorated. In the case of Comparative Example 5, where a small amount of maleic anhydride-modified rubber polymer was applied, it can be seen that impact resistance, etc. were deteriorated, and in the case of Comparative Example 6, where an excessive amount of maleic anhydride-modified rubber polymer was applied, it can be seen that fluidity, appearance characteristics, etc. were deteriorated. In the case of Comparative Example 7, where a small amount of talc was applied, it can be seen that fluidity, etc. was reduced, and in the case of Comparative Example 8, where an excessive amount of talc was applied, it can be seen that impact resistance, appearance characteristics, etc. were reduced.

[0128] In addition, even when the maleic anhydride-modified rubber polymer and talc were applied within the content range of the present invention, in the case of Comparative Example 9, where the weight ratio of the maleic anhydride-modified rubber polymer and talc was less than the range of the present invention, it was found that the fluidity, appearance properties, etc. were deteriorated, and in the case of Comparative Example 10, where the weight ratio of the maleic anhydride-modified rubber polymer and talc exceeded the range of the present invention, it was found that the impact resistance, etc. were deteriorated.

[0129]

[0130] The present invention has been described with reference to exemplary embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. About 100 parts by weight of a base material comprising about 20 to about 60 wt% of an amorphous polyamide resin, about 10 to about 40 wt% of a semi-crystalline polyamide resin, and about 10 to about 50 wt% of glass fiber; About 10 to about 30 parts by weight of a maleic anhydride modified rubber polymer; and Contains about 0.1 to about 4 parts by weight of talc; A polyamide resin composition characterized in that the weight ratio of the maleic anhydride modified rubber polymer and the talc is about 1:0.01 to about 1:0.

3.

2. A polyamide resin composition according to claim 1, characterized in that the amorphous polyamide resin comprises at least one of polyamide MACM10, polyamide MACM12, polyamide MACM14, polyamide PACM10, polyamide PACM12, and polyamide PACM14.

3. A polyamide resin composition according to claim 1 or 2, characterized in that the semi-crystalline polyamide resin comprises at least one of polyamide 6, polyamide 6 / 6, polyamide 6 / 12, polyamide 11, polyamide 12, and polyamide 10 / 12.

4. A polyamide resin composition according to any one of claims 1 to 3, wherein the glass fiber is a circular glass fiber having a cross-sectional diameter of about 5 to about 20 ㎛.

5. A polyamide resin composition according to any one of claims 1 to 4, wherein the maleic anhydride-modified rubber polymer comprises at least one of a maleic anhydride-modified olefin-based elastomer and a maleic anhydride-modified styrene-based elastomer.

6. A polyamide resin composition according to claim 5, wherein the maleic anhydride-modified olefin elastomer comprises at least one of an ethylene-propylene copolymer graft-polymerized with maleic anhydride, an ethylene-1-butene copolymer graft-polymerized with maleic anhydride, and an ethylene-1-octene copolymer graft-polymerized with maleic anhydride.

7. A polyamide resin composition according to claim 5 or 6, characterized in that the styrene-based and maleic anhydride-modified styrene-based elastomer comprises at least one of a styrene-ethylene / butylene-styrene copolymer graft-polymerized with maleic anhydride, a styrene-ethylene-butylene copolymer graft-polymerized with maleic anhydride, a styrene-butadiene-styrene copolymer graft-polymerized with maleic anhydride, and styrene-ethylene / butadiene-styrene.

8. A polyamide resin composition according to any one of claims 1 to 7, wherein the weight ratio of the amorphous polyamide resin and the semi-crystalline polyamide resin is about 1:0.1 to about 1:

2.

9. A polyamide resin composition according to any one of claims 1 to 8, wherein the weight ratio of the glass fiber and the maleic anhydride-modified rubber polymer is about 1:0.1 to about 1:

1.

10. A polyamide resin composition according to any one of claims 1 to 9, characterized in that the weight ratio of the glass fiber and the talc is about 1:0.01 to about 1:0.

2.

11. A polyamide resin composition according to any one of claims 1 to 10, characterized in that the polyamide resin composition has a notched Izod impact strength of about 10 to about 30 kgf·cm / cm of a 1 / 8" thick specimen measured according to ASTM D256.

12. A polyamide resin composition according to any one of claims 1 to 11, characterized in that no cracks occur when a 1 kg or 500 g weight is dropped 10 times from a height of 1 m on an injection molded specimen having a thickness of 1 mm, as measured by the DuPont drop measurement method.

13. A polyamide resin composition according to any one of claims 1 to 12, characterized in that the polyamide resin composition has a melt-flow index (MI) of about 10 to about 35 g / 10 min, measured under conditions of 250°C and 5 kgf according to ASTM D1238.

14. A polyamide resin composition according to any one of claims 1 to 13, characterized in that the gloss of an injection-molded specimen measured at a reflection angle of 75° using a gloss meter is about 89 to about 95 GU.

15. A molded product characterized by being formed from a polyamide resin composition according to any one of claims 1 to 14.