Liquid crystal polymer composition and molded article produced therefrom

Abstract

A liquid crystal polymer composition of the present invention comprises: about 100 parts by weight of a base material including about 91 to about 99 wt% of a liquid crystal polymer and about 1 to about 9 wt % of a polyester resin; about 10 to about 35 parts by weight of mica; about 1 to about 10 parts by weight of a nanocompound containing at least one of a conductive nanocompound and an oxide nanocompound; about 0.1 to about 5 parts by weight of a modified olefin-based copolymer containing an epoxy group; about 0.1 to about 5 parts by weight of an impact modifier having a core-shell structure; and about 0.1 to about 5 parts by weight of a maleic anhydride modified olefin-based copolymer, wherein the weight ratio of the modified olefin-based copolymer containing an epoxy group to the impact modifier having a core-shell structure is about 1: 0.5 to about 1: 3. The liquid crystal polymer composition has excellent weld strength, dent resistance, appearance characteristics and the like, and generates little dust.

Description

Liquid crystal polymer composition and molded article manufactured therefrom

[0001] The present invention relates to a liquid crystal polymer composition and a molded article manufactured therefrom. More specifically, the present invention relates to a liquid crystal polymer composition having excellent weld strength, crack resistance, and appearance characteristics, and producing little dust, and a molded article manufactured therefrom.

[0002]

[0003] Recent advancements in electronics and communications are leading to the production of mobile devices featuring highly integrated, complex structures and thin-walled components. Among these mobile devices, compact camera module (CCM) components are manufactured using liquid crystalline polymer (LCP)-based materials, which boast excellent heat resistance, dimensional stability, and the ability to be molded into thin walls.

[0004] However, mobile devices such as compact camera module components manufactured from liquid crystal polymer-based materials may experience image defects or malfunctions in autofocus and optical image stabilization due to particles and / or dust generated from the materials coming into contact with the CMOS (complementary metal oxide semiconductor) sensor, ball dents (surface depressions) due to bearing balls, etc., and there is a risk of failure of the entire device due to low weld strength. In addition, there is a risk of optical function deterioration due to fibrillation (surface whitening) during dust cleaning processes using ultrasonic waves, such as during the assembly process.

[0005] Therefore, there is a need to develop a liquid crystal polymer composition that has excellent weld strength, corrosion resistance, and appearance properties, and generates less dust.

[0006] The background technology of the present invention is disclosed in Korean Patent No. 10-1537109, etc.

[0007]

[0008] The purpose of the present invention is to provide a liquid crystal polymer composition having excellent weld strength, wear resistance, appearance properties, etc., and generating less dust.

[0009] Another object of the present invention is to provide a molded article formed from the liquid crystal polymer 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 liquid crystal polymer composition. The liquid crystal polymer composition comprises: about 100 parts by weight of a base material comprising about 91 to about 99 weight % of a liquid crystal polymer and about 1 to about 9 weight % of a polyester resin; about 10 to about 35 weight parts of mica; about 1 to about 10 weight parts of a nanocompound comprising at least one of a conductive nanocompound and an oxide nanocompound; about 0.1 to about 5 weight parts of a modified olefin copolymer comprising an epoxy group; about 0.1 to about 5 weight parts of a core-shell structured impact modifier; and about 0.1 to about 5 weight parts of a maleic anhydride modified olefin copolymer; wherein a weight ratio of the modified olefin copolymer comprising an epoxy group and the core-shell structured impact modifier is about 1:0.5 to about 1:3.

[0013] 2. In the above 1 specific example, the liquid crystal polymer may have a crystalline melting point of about 280 to about 360°C.

[0014] 3. In the above 1 or 2 specific examples, the polyester resin may include at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate, and polycyclohexylenedimethylene terephthalate.

[0015] 4. In the above specific examples 1 to 3, the mica may have an average particle size of about 15 to about 50 μm.

[0016] 5. In the above 1 to 4 specific examples, the conductive nanocompound may include at least one of carbon black, graphite, expanded graphite, graphene, carbon nanotubes, carbon fibers, and metal nanoparticles.

[0017] 6. In the above 1 to 5 specific examples, the oxide nanocompound may include at least one of barium sulfate, silica, spinel copper chromate, and alumina.

[0018] 7. In the above 1 to 6 specific examples, the modified olefin copolymer including the epoxy group may include at least one of a glycidyl (meth)acrylate modified ethylene-methyl acrylate copolymer, a glycidyl (meth)acrylate modified polyethylene, a glycidyl (meth)acrylate modified ethylene-ethyl acrylate copolymer, and a glycidyl (meth)acrylate modified ethylene-butyl acrylate copolymer.

[0019] 8. In the above 1 to 7 specific examples, the impact modifier of the core-shell structure may be a rubber polymer in which an unsaturated compound including at least one of an acrylic monomer, an aromatic vinyl monomer, and a cyanide vinyl monomer is graft-polymerized.

[0020] 9. In the above 1 to 8 specific examples, the maleic anhydride-modified olefin copolymer may include at least one of an ethylene-octene rubber (MAH-g-EOR) graft polymerized with maleic anhydride, an ethylene-butene rubber (MAH-g-EBR) graft polymerized with maleic anhydride, an ethylene-propylene-diene terpolymer (MAH-g-EPDM) graft polymerized with maleic anhydride, and a styrene-ethylene-butylene-styrene (MAH-g-SEBS) graft polymerized with maleic anhydride.

[0021] 10. In the above 1 to 9 specific examples, the weight ratio of the modified olefin copolymer including the epoxy group and the maleic anhydride modified olefin copolymer may be about 1:0.2 to about 1:2.

[0022] 11. In the above 1 to 10 specific examples, the liquid crystal polymer composition may have a weld strength of about 5 to about 8 N of an injection molded specimen measuring 8 mm × 8 mm × 0.2 mm when pulled at a speed of 0.5 mm / s in the direction in which a weld line occurs using a push-pull device.

[0023] 12. In the above 1 to 11 specific examples, the liquid crystal polymer composition is formed by injecting a CCM actuator housing and a carrier actual part having a size of 8 mm × 8 mm × 0.2 mm, inserting a ceramic bearing ball, assembling the CCM actuator, exposing the CCM actuator assembly to a 25 kHz vibration condition for 12 hours using a vibration tester, and then disassembling the assembly, and the surface dent depth of the CCM actuator housing measured using a 3D optical profilometer may be about 4 ㎛ or less.

[0024] 13. In the above 1 to 12 specific examples, the liquid crystal polymer composition may have a dust generation amount of about 10 to about 110 ppm measured according to the following Equation 1 after a tumbler evaluation in which a Lego block-shaped injection molded specimen having 8 protrusions and 32 mm × 16 mm × 9 mm in size is placed in a tumbler having 30 cm × 30 cm × 100 cm in size and rotated 2,000 times under conditions of 7 rpm:

[0025] [Formula 1]

[0026] Dust production = (W1 - W2) / W1

[0027] In the above equation 1, W1 is the weight of the specimen before tumbler evaluation, and W2 is the weight of the specimen after tumbler evaluation.

[0028] 14. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a liquid crystal polymer composition according to any one of 1 to 13.

[0029] 15. In the above 14 specific examples, the molded product may be a compact camera module part.

[0030]

[0031] The present invention has the effect of providing a liquid crystal polymer composition having excellent weld strength, wear resistance, appearance properties, etc. and generating less dust, and a molded article formed therefrom.

[0032]

[0033] Hereinafter, the present invention will be described in detail as follows.

[0034] The liquid crystal polymer composition according to the present invention comprises (A) a liquid crystal polymer; (B) a polyester resin; (C) mica; (D) a nano-compound; (E) a modified olefin copolymer containing an epoxy group; (F) an impact modifier having a core-shell structure; and (G) a maleic anhydride modified olefin copolymer.

[0035] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0036]

[0037] (A) Liquid crystal polymer

[0038] According to one specific example of the present invention, a liquid crystalline polymer (LCP) is applied together with a polyester resin, mica, a nano-compound, a modified olefin copolymer containing an epoxy group, a core-shell structured impact modifier, and a maleic anhydride modified olefin copolymer, and can improve the weld strength, dent resistance, and appearance properties of a liquid crystalline polymer composition (molded product) and reduce dust generation. As a liquid crystalline polymer that exhibits an anisotropic melt phase, a liquid crystalline polyesteramide, a liquid crystalline polyester, or the like, which is called a thermotropic liquid crystalline polymer, can be used. Here, the anisotropic melt phase of the liquid crystalline polymer can be confirmed by a method of a conventional polarization system using a right-angle light polarizer. For example, under a nitrogen atmosphere, a sample on a Leitz heating plate can be observed with a Leitz polarization microscope.

[0039] In specific embodiments, the liquid crystal polymer may include repeating units of aromatic oxycarbonyl, aromatic dicarbonyl, aromatic dioxy, aromatic aminooxy, aromatic aminocarbonyl, aromatic diamino, aromatic oxydicarbonyl, aliphatic dioxy, or combinations thereof.

[0040] In specific embodiments, the liquid crystal polymer comprising the repeating units described above may include both those that provide an anisotropic melt phase and those that do not, depending on the structural elements of the polymer and the ratio and arrangement distribution of the elements. The liquid crystal polymer used in the present invention exhibits an anisotropic melt phase.

[0041] In specific embodiments, examples of monomers providing the aromatic oxycarbonyl repeating unit include 4-hydroxybenzoic acid, m-hydroxybenzoic acid, o-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, 5-hydroxy-2-naphthoic acid, 3-hydroxy-2-naphthoic acid, 4'-hydroxybiphenyl-4-carboxylic acid, 3'-hydroxybiphenyl-4-carboxylic acid, 4'-hydroxybiphenyl-3-carboxylic acid, and alkyl-, alkoxy- or halogen-substituted derivatives thereof, and ester-forming derivatives such as acyl derivatives, ester derivatives and acyl halides thereof. Among the above, 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid are preferable from the viewpoint of easier control of the properties and melting point of the resulting liquid crystal polymer.

[0042] In specific embodiments, examples of monomers providing the aromatic dicarbonyl repeating unit include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid, 1,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, and 4,4'-dicarboxybiphenyl, and alkyl-, alkoxy- or halogen-substituted derivatives thereof, and ester derivatives thereof, ester-forming derivatives such as acid halides. Among the above, terephthalic acid and 2,6-naphthalenedicarboxylic acid are preferable from the viewpoint of easier control of the mechanical properties, heat resistance, melting point, and molding properties of the resulting liquid crystal polymer.

[0043] In specific embodiments, examples of monomers providing the aromatic dioxy repeating unit include aromatic diols such as hydroquinone, resorcin, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 1,4-dihydroxynaphthalene, 4,4'-dihydroxybiphenyl, 3,3'-dihydroxybiphenyl, 3,4'-dihydroxybiphenyl, 4,4'-dihydroxybiphenyl ether, and ester-forming derivatives such as alkyl-, alkoxy-, or halogen-substituted derivatives, and acyl derivatives thereof. Among the above, hydroquinone and 4,4'-dihydroxybiphenyl are preferable from the viewpoint of good reactivity during the polymerization process and good properties of the resulting liquid crystal polymer blend.

[0044] In specific embodiments, examples of monomers providing the aromatic aminooxy repeating unit are aromatic hydroxyamines such as p-aminophenol, m-aminophenol, N-acetyl-4-aminophenol, 4-amino-1-naphthol, 5-amino-1-naphthol, 8-amino-2-naphthol, 4-amino-4'-hydroxybiphenyl, and ester-forming derivatives such as alkyl-, alkoxy- or halogen-substituted derivatives and acyl derivatives thereof, and amide-forming derivatives such as N-acyl derivatives thereof.

[0045] In specific embodiments, examples of monomers providing the aromatic diamino repeating units are aromatic diamines such as p-phenylenediamine, m-phenylenediamine, 1,5-diaminonaphthalene, 1,8-diaminonaphthalene and amide-forming derivatives such as alkyl-, alkoxy- or halogen-substituted derivatives, and N-acyl derivatives thereof.

[0046] In specific embodiments, examples of monomers providing the aromatic aminocarbonyl repeating unit are aromatic aminocarboxylic acids such as p-aminobenzoic acid, m-aminobenzoic acid, 6-amino-2-naphthoic acid and alkyl-, alkoxy- or halogen-substituted derivatives thereof, and ester-forming derivatives such as acyl derivatives, ester derivatives and acid halides thereof, and amide-forming derivatives such as N-acyl derivatives thereof.

[0047] In specific embodiments, examples of monomers providing the aromatic oxydicarbonyl repeating unit are hydroxy-aromatic dicarboxylic acids such as 3-hydroxy-2,7-naphthalenedicarboxylic acid, 4-hydroxyisophthalic acid, 5-hydroxyisophthalic acid, and alkyl-, alkoxy-, or halogen-substituted derivatives thereof, and ester-forming derivatives such as acyl derivatives, ester derivatives, and acyl halides thereof.

[0048] In specific embodiments, examples of monomers providing the aliphatic dioxy repeating units include aliphatic diols such as ethylene glycol, 1,4-butanediol, and 1,6-hexanediol, and acyl derivatives thereof. In addition, a liquid crystal polymer having aliphatic dioxy repeating units can be obtained by reacting a polyester having aliphatic dioxy repeating units such as polyethylene terephthalate or polybutylene terephthalate with the aromatic oxycarboxylic acid, aromatic dicarboxylic acid, aromatic diol, aromatic hydroxyamine, aromatic aminocarboxylic acid, aromatic diamine or acyl derivative, ester derivative or acid halide thereof.

[0049] In specific embodiments, the liquid crystal polymer may have a thioester bond, provided that the bond does not impair the purpose of the present invention. Examples of monomers providing a thioester bond include mercapto-aromatic carboxylic acid, aromatic dithiol, and hydroxy-aromatic thiol. The proportion of such additional monomers based on the total amount of monomers providing aromatic oxycarbonyl, aromatic dicarbonyl, aromatic dioxy, aromatic aminooxy, aromatic diamino, aromatic oxydicarbonyl, and aliphatic dioxy repeating units is preferably about 10 mol% or less.

[0050] Among the above, the preferred liquid crystal polymer used in the present invention is one that includes an aromatic oxycarbonyl repeating unit including a 4-oxybenzoyl repeating unit and / or a 6-oxy-2-naphthoyl repeating unit.

[0051] In specific embodiments, examples of preferred liquid crystal polymers comprising 4-oxybenzoyl and / or 6-oxy-2-naphthoyl repeating units may include:

[0052] 1) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid copolymer,

[0053] 2) 4-hydroxybenzoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl copolymer,

[0054] 3) 4-hydroxybenzoic acid / terephthalic acid / isophthalic acid / 4,4'-dihydroxybiphenyl copolymer,

[0055] 4) 4-hydroxybenzoic acid / terephthalic acid / isophthalic acid / 4,4'-dihydroxybiphenyl / hydroquinone copolymer,

[0056] 5) 4-hydroxybenzoic acid / terephthalic acid / hydroquinone copolymer,

[0057] 6) 6-hydroxy-2-naphthoic acid / terephthalic acid / hydroquinone copolymer,

[0058] 7) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl copolymer,

[0059] 8) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl / N-acetyl-4-aminophenol copolymer,

[0060] 9) 6-hydroxy-2-naphthoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl copolymer,

[0061] 10) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / hydroquinone copolymer,

[0062] 11) 4-hydroxybenzoic acid / 2,6-naphthalene dicarboxylic acid / 4,4'-dihydroxybiphenyl copolymer,

[0063] 12) 4-hydroxybenzoic acid / terephthalic acid / 2,6-naphthalene dicarboxylic acid / hydroquinone copolymer,

[0064] 13) 4-hydroxybenzoic acid / 2,6-naphthalene dicarboxylic acid / hydroquinone copolymer,

[0065] 14) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / 2,6-naphthalene dicarboxylic acid / hydroquinone copolymer,

[0066] 15) 4-hydroxybenzoic acid / terephthalic acid / 2,6-naphthalene dicarboxylic acid / hydroquinone / 4,4'-dihydroxybiphenyl copolymer,

[0067] 16) 4-hydroxybenzoic acid / terephthalic acid / 4-aminophenol copolymer,

[0068] 17) 6-hydroxy-2-naphthoic acid / terephthalic acid / 4-aminophenol copolymer,

[0069] 18) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / 4-aminophenol copolymer,

[0070] 19) 4-hydroxybenzoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl / 4-aminophenol copolymer,

[0071] 20) 4-hydroxybenzoic acid / terephthalic acid / ethylene glycol copolymer,

[0072] 21) 4-hydroxybenzoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl / ethylene glycol copolymer,

[0073] 22) 4-hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / ethylene glycol copolymer, and

[0074] 23) 4-Hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl / ethylene glycol copolymer.

[0075] Among the above, copolymers of 1), 8), 9) and 13) are preferable from the viewpoint of formability and mechanical properties of the liquid crystal polymer.

[0076] In a specific embodiment, the liquid crystal polymer may be a liquid crystal polymer blend comprising two or more liquid crystal polymers for the purpose of increasing fluidity during molding.

[0077] In specific embodiments, the method for producing the liquid crystal polymer is not limited, and any method known in the art may be utilized. For example, conventional polycondensation methods such as slurry polymerization and melt acid decomposition, which produce ester and / or amide bonds among the monomer elements described above, may be utilized to produce the liquid crystal polymer.

[0078] In specific embodiments, the above-described melt acid decomposition method is preferably used for the production of liquid crystal polymers. In this method, the monomers are heated to form a molten solution, and then the solution is reacted to form a molten polymer. The final step of this method may be performed under vacuum to facilitate the removal of volatile byproducts such as acetic acid or water.

[0079] In a specific embodiment, the slurry polymerization method is characterized in that the monomer is reacted in a heat-exchange fluid to produce a solid-state polymer in the form of a suspension in the heat-exchange liquid medium.

[0080] In a specific embodiment, in either the melt acid decomposition method or the slurry polymerization method, the polymerizing monomer may be in the form of a lower acyl derivative obtained by acylating a hydroxyl group and / or an amino group. The lower acyl group may have 2 to 5 carbon atoms, for example, 2 to 3 carbon atoms. Preferably, an acetylated monomer is used in the reaction.

[0081] In specific embodiments, the lower acyl derivative of the monomer may be prepared by independently acylating the monomer previously, or may be produced in the reaction system by adding an acylating agent such as acetic anhydride to the monomer during the preparation of the liquid crystal polymer.

[0082] In a specific embodiment, in either the molten acid cracking method or the slurry polymerization method, a catalyst may be utilized in the reaction if desired.

[0083] In specific embodiments, examples of catalysts include organotin compounds such as dialkyl tin oxides (e.g., dibutyl tin oxide) and diaryl tin oxides; antimony trioxide; titanium dioxide; organotin compounds such as alkoxy titanium silicates and titanium alkoxides; alkali or alkaline earth metal salts of carboxylic acids such as potassium acetate; salts of inorganic acids (e.g., K2SO4); and gaseous acid catalysts such as Lewis acids (e.g., BF3) and hydrogen halides (e.g., HCl).

[0084] In specific examples, when a catalyst is used, the amount of catalyst added to the reaction may be from about 10 to about 1,000 ppm, for example from about 20 to about 200 ppm, based on the total amount of monomers.

[0085] In a specific example, the liquid crystal polymer may be obtained from a reaction vessel in which it is polymerized in a molten state and then processed to produce pellets, flakes or powder.

[0086] In specific embodiments, the liquid crystal polymer in the form of pellets, flakes, or powder may be heated to a substantially solid state, if desired, under vacuum or an inert gas atmosphere such as nitrogen or helium. The heat treatment temperature may be from about 260 to about 350°C, for example from about 280 to about 320°C.

[0087] In a specific embodiment, the liquid crystal polymer may have a crystalline melting point (Tm) of about 280 to about 360°C as determined by differential scanning calorimetry. A method for determining the crystalline melting point is as follows:

[0088] A differential scanning calorimeter (DSC) such as an Exstar 6000 (Seiko Instruments Inc.) or the same type of DSC device is used. The liquid crystal polymer sample to be observed is heated from room temperature at a rate of 20°C / min to measure the endothermic peak (Tm1). The sample is then maintained at a temperature 20 to 50°C higher than Tm1 for 10 minutes. The sample is then cooled to room temperature at a rate of 10°C / min and heated again at a rate of 10°C / min. The endothermic peak found at the final stage is recorded as the crystalline melting point (Tm) of the liquid crystal polymer sample.

[0089] In a specific example, the liquid crystal polymer may be included in an amount of about 91 to about 99 wt%, for example, about 94 to about 98 wt%, of 100 wt% of the base material including the liquid crystal polymer and the polyester resin described below. When the content of the liquid crystal polymer is less than about 91 wt% of the base material, there is a concern that the appearance characteristics of the liquid crystal polymer composition (molded product) may deteriorate, and when it exceeds about 99 wt%, there is a concern that the appearance characteristics of the liquid crystal polymer composition (molded product) may deteriorate.

[0090]

[0091] (B) Polyester resin

[0092] According to one specific example of the present invention, a polyester resin is applied together with a liquid crystal polymer, mica, a nano-compound, a modified olefin copolymer containing an epoxy group, an impact modifier having a core-shell structure, and a maleic anhydride modified olefin copolymer, thereby improving the weld strength, dent resistance, and appearance properties of a liquid crystal polymer composition (molded product) and reducing dust generation. A polyester resin used in a typical thermoplastic resin composition can be used. For example, the polyester resin may include, as a dicarboxylic acid component, aromatic dicarboxylic acids such as terephthalic acid (TPA), isophthalic acid (IPA), 1,2-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid, 1,6-naphthalene dicarboxylic acid, 1,7-naphthalene dicarboxylic acid, 1,8-naphthalene dicarboxylic acid, 2,3-naphthalene dicarboxylic acid, 2,6-naphthalene dicarboxylic acid, and 2,7-naphthalene dicarboxylic acid, dimethyl terephthalate (DMT), dimethyl isophthalate, dimethyl-1,2-naphthalate, Aromatic dicarboxylates such as dimethyl-1,5-naphthalate, dimethyl-1,7-naphthalate, dimethyl-1,8-naphthalate, dimethyl-2,3-naphthalate, dimethyl-2,6-naphthalate, and dimethyl-2,7-naphthalate can be obtained by polycondensation with diol components such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-dimethyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and cyclic alkylenediol.

[0093] In specific examples, the polyester resin may include one or more of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polytrimethylene terephthalate (PTT), and polycyclohexylenedimethylene terephthalate (PCT). For example, the polyester resin may be polyethylene terephthalate, polybutylene terephthalate, or a combination thereof.

[0094] In a specific example, the polyester resin may be dissolved in a solvent containing phenol / 1,1,2,2-tetrachloroethane in a weight ratio of 60 / 40 and may have an intrinsic viscosity of about 0.6 to about 1.5 dl / g, for example, about 0.7 to about 1.3 dl / g, as measured using a Ubbelohde viscometer (capillary viscometer) at 25°C. Within this range, the liquid crystal polymer composition may have excellent processability, dimensional stability, and the like.

[0095] In a specific example, the polyester resin may be included in an amount of about 1 to about 9 wt%, for example, about 2 to about 6 wt%, based on 100 wt% of the base material including the liquid crystal polymer and the polyester resin. If the content of the polyester resin is less than about 1 wt%, based on 100 wt% of the base material, there is a concern that the appearance characteristics of the liquid crystal polymer composition (molded product), the dust generation reduction effect, etc. may deteriorate, and if it exceeds about 9 wt%, there is a concern that the appearance characteristics of the liquid crystal polymer composition (molded product) may deteriorate.

[0096]

[0097] (C) Micah

[0098] According to one specific example of the present invention, mica is applied together with a liquid crystal polymer, a polyester resin, a nano-compound, a modified olefin copolymer containing an epoxy group, an impact modifier having a core-shell structure, and a maleic anhydride modified olefin copolymer, thereby improving the weld strength, crack resistance, and appearance characteristics of a liquid crystal polymer composition (molded product) and reducing dust generation. Conventional plate-shaped mica can be used.

[0099] In a specific example, the mica may have an average particle size (D50) of about 15 to about 50 μm, for example, about 20 to about 40 μm, as measured by a particle size measuring device (Malvern Panalytical Ltd., mastersizer 3000). Within this range, the surface appearance of the liquid crystal polymer composition (molded product) may be excellent.

[0100] In a specific example, the mica may be included in an amount of about 10 to about 35 parts by weight, for example, about 15 to about 30 parts by weight, based on about 100 parts by weight of the base material. If the content of the mica 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 weld strength, crack resistance, etc. of the liquid crystal polymer composition (molded product) may be reduced, and if it exceeds about 35 parts by weight, there is a concern that the crack resistance, dust generation reduction effect, etc. of the liquid crystal polymer composition (molded product) may be reduced.

[0101]

[0102] (D) Nanocompounds

[0103] A nanocompound according to one specific example of the present invention is applied together with a liquid crystal polymer, a polyester resin, mica, a modified olefin copolymer containing an epoxy group, an impact modifier having a core-shell structure, and a maleic anhydride modified olefin copolymer, etc., to improve the weld strength, dent resistance, and appearance characteristics of a liquid crystal polymer composition (molded product), and to reduce dust generation, and may include at least one of a conductive nanocompound and an oxide nanocompound.

[0104] In a specific example, the conductive nanocompound may include one or more of carbon black, graphite, expanded graphite, graphene, carbon nanotubes, carbon fibers, and metallic nanoparticles such as silver (Ag), copper (Cu), and gold (Au).

[0105] In a specific example, the oxide nanocompound may include one or more of barium sulfate (BaSO4), silica (SiO2), spinel copper chromate (spinel CuCrO4), and alumina.

[0106] In a specific example, the nanocomposite may have an average particle size of 50 particles, as measured by a transmission electron microscope (TEM), of about 20 to about 100 nm, for example, about 40 to about 80 nm. Within this range, the liquid crystal polymer composition (molded product) may have excellent weld strength, appearance properties, etc.

[0107] In a specific example, the nano-compound may be included in an amount of about 1 to about 10 parts by weight, for example, about 2 to about 7 parts by weight, relative to about 100 parts by weight of the base material. If the content of the nano-compound is less than about 1 part by weight relative to about 100 parts by weight of the base material, there is a concern that the appearance characteristics of the liquid crystal polymer composition (molded product), the dust reduction effect, etc. may be deteriorated, and if it exceeds about 10 parts by weight, there is a concern that the weld strength, crack resistance, dust reduction effect, etc. of the liquid crystal polymer composition (molded product) may be deteriorated.

[0108]

[0109] (E) Modified olefin copolymer containing an epoxy group

[0110] According to one specific example of the present invention, a modified olefin copolymer containing an epoxy group is applied together with a liquid crystal polymer, a polyester resin, mica, a nano-compound, an impact modifier having a core-shell structure, and a maleic anhydride modified olefin copolymer, thereby improving the weld strength, crack resistance, and appearance characteristics of a liquid crystal polymer composition (molded product), and reducing dust generation.

[0111] In specific examples, the compound containing the epoxy group may be glycidyl (meth)acrylate, glycidyl ethacrylate, aryl glycidyl ether, mixtures thereof, for example, glycidyl (meth)acrylate, and the like.

[0112] In a specific example, the olefin copolymer may be a homopolymer of an alkylene monomer, a copolymer of two or more alkylene monomers, and / or an alkylene-alkyl (meth)acrylate copolymer, and the alkylene monomer may be an alkylene monomer having 2 to 10 carbon atoms, for example, ethylene, propylene, isopropylene, butylene, isobutylene, octene, etc.

[0113] In a specific example, the modified olefin copolymer including the epoxy group may include at least one of a glycidyl (meth)acrylate modified ethylene-methyl acrylate copolymer, a glycidyl (meth)acrylate modified polyethylene, a glycidyl (meth)acrylate modified ethylene-ethyl acrylate copolymer, and a glycidyl (meth)acrylate modified ethylene-butyl acrylate copolymer.

[0114] In a specific example, the modified olefin copolymer including the epoxy group may have a melt flow index (MI) of about 2 to about 20 g / 10 min, for example, about 4 to about 12 g / 10 min, measured under conditions of 190°C and 2.16 kg according to ASTM D1238. Within this range, the melt strength, etc. of the liquid crystal polymer composition may be excellent.

[0115] In a specific example, the modified olefin copolymer containing an epoxy group may be included in an amount of about 0.1 to about 5 parts by weight, for example, about 1.6 to about 4 parts by weight, based on about 100 parts by weight of the base material. If the content of the modified olefin copolymer containing an epoxy group is less than about 0.1 parts by weight based on about 100 parts by weight of the base material, there is a concern that the crack resistance, etc. of the liquid crystal polymer composition (molded product) may be reduced, and if it exceeds about 5 parts by weight, there is a concern that the weld strength, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be reduced.

[0116]

[0117] (F) Core-shell structure impact modifier

[0118] According to one specific example of the present invention, a core-shell structured impact modifier is applied together with a liquid crystal polymer, a polyester resin, mica, a nano-compound, a modified olefin copolymer containing an epoxy group, a maleic anhydride modified olefin copolymer, etc., to improve the weld strength, dent resistance, appearance characteristics, etc. of a liquid crystal polymer composition (molded product), and to reduce dust generation. A graft copolymer in which an unsaturated compound containing at least one of an acrylic monomer, an aromatic vinyl monomer, and a cyanide vinyl monomer is graft-polymerized onto a rubbery polymer (core) to form a shell can be used.

[0119] In a specific example, the rubber polymer may include a rubber polymer polymerized with a diene monomer; a rubber polymer copolymerized with a monomer including at least one of a diene monomer and an acrylic monomer, a silicone monomer, and a styrene monomer; a combination thereof, etc.

[0120] In specific examples, the diene monomer may include butadiene, isoprene, etc., and for example, butadiene may be used.

[0121] In specific examples, examples of the acrylic monomer include alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, hexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Here, the alkyl refers to alkyl having C1 to C10. When polymerizing using the acrylic monomer, a crosslinking agent such as ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, allyl methacrylate, and triallyl cyanurate can be used.

[0122] In specific examples, the silicone monomers include linear siloxanes such as dimethylsiloxane, methylethylsiloxane, methylphenylsiloxane, methylhydroxysiloxane, methylpropylsiloxane, and methylbutylsiloxane; and cyclosiloxanes such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane, and octaphenylcyclotetrasiloxane. These may be used alone or in combination of two or more. At this time, a crosslinking agent such as trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, and tetraethoxysilane may be used.

[0123] In specific examples, the styrene-based monomer may include styrene, C1-C10 alkyl-substituted styrene, halogen-substituted styrene, and combinations thereof.

[0124] In specific examples, examples of rubber polymers obtained by polymerizing the diene monomer include polybutadiene, and examples of rubber polymers obtained by copolymerizing a monomer including the diene monomer and at least one of an acrylic monomer, a silicone monomer, and a styrene monomer include copolymers of butadiene and at least one alkyl (meth)acrylate, such as a methyl methacrylate-butadiene-ethyl acrylate rubber copolymer, and copolymers of butadiene, an alkyl (meth)acrylate, and cyclosiloxane. The rubber polymers may be used alone or in combination of two or more.

[0125] In a specific example, the rubbery polymer (core) may have an average particle size of about 0.05 to about 2 μm, for example, about 0.15 to about 1 μm. In this range, the impact resistance, appearance properties, etc. of the liquid crystal polymer composition (molded product) may be excellent. Here, the average particle size (z-average) of the rubbery polymer (core) may be measured using a light scattering method in a latex state. Specifically, the rubbery polymer latex is filtered through a mesh to remove coagulants generated during the polymerization of the rubbery polymer, a solution of 0.5 g of latex and 30 ml of distilled water is mixed, and a 1,000 ml flask is filled with distilled water to prepare a sample, and then 10 ml of the sample is transferred to a quartz cell, and the average particle size of the rubbery polymer can be measured using a light scattering particle size analyzer (Malvern Panalytical Ltd., nano-zs).

[0126] In a specific example, among the unsaturated compounds, examples of acrylic monomers include alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, hexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Here, the alkyl refers to alkyl having C1 to C10.

[0127] In specific examples, among the above unsaturated compounds, examples of aromatic vinyl monomers include styrene, α-methyl styrene, β-methyl styrene, p-methyl styrene, pt-butyl styrene, ethyl styrene, vinyl xylene, monochlorostyrene, dichlorostyrene, dibromostyrene, vinylnaphthalene, etc. These may be used alone or in combination of two or more.

[0128] In a specific example, among the unsaturated compounds, examples of the cyanide vinyl monomer include acrylonitrile, methacrylonitrile, ethacrylonitrile, phenylacrylonitrile, α-chloroacrylonitrile, fumaronitrile, etc. These may be used alone or in combination of two or more.

[0129] In a specific example, the content of the rubber polymer may be about 40 to about 80 wt%, for example, about 50 to about 70 wt%, of the total 100 wt% of the impact modifier having a core-shell structure. Within this range, the impact resistance, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be excellent.

[0130] In a specific example, the impact modifier of the core-shell structure may be included in an amount of about 0.1 to about 5 parts by weight, for example, about 1 to about 4.5 parts by weight, specifically about 2 to about 4.2 parts by weight, relative to about 100 parts by weight of the base material. When the content of the impact modifier of the core-shell structure is less than about 0.1 parts by weight relative to about 100 parts by weight of the base material, there is a concern that the crack resistance, etc. of the liquid crystal polymer composition (molded product) may be reduced, and when it exceeds about 5 parts by weight, there is a concern that the weld strength, etc. of the liquid crystal polymer composition (molded product) may be reduced.

[0131] In a specific example, the weight ratio of the nanocompound and the modified olefin copolymer containing an epoxy group and the core-shell structured impact modifier (nanocompound: (modified olefin copolymer containing an epoxy group + core-shell structured impact modifier)) may be about 1:0.1 to about 1:3.5, for example, about 1:0.5 to about 1:3, specifically about 1:0.8 to about 1:2.7. In the above range, the dent resistance, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be more excellent.

[0132] In a specific example, the weight ratio of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure may be about 1:0.5 to about 1:3, for example, about 1:0.8 to about 1:2.7. Even if the content of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure is included in the scope of the present invention, when the weight ratio of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure is less than about 1:0.5, there is a concern that the weld strength, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be deteriorated, and when it exceeds about 1:3, there is a concern that the dent resistance, etc. of the liquid crystal polymer composition (molded product) may be deteriorated.

[0133]

[0134] (G) Maleic anhydride modified olefin copolymer

[0135] According to one specific example of the present invention, a maleic anhydride-modified olefin copolymer is applied together with a liquid crystal polymer, a polyester resin, mica, a nano-compound, a modified olefin copolymer containing an epoxy group, and an impact modifier having a core-shell structure, thereby improving the weld strength, crack resistance, and appearance characteristics of a liquid crystal polymer composition (molded product), and reducing dust generation.

[0136] In a specific example, the maleic anhydride-modified olefin copolymer may be prepared by graft polymerizing maleic anhydride onto an olefin copolymer, which is a copolymer of a monomer mixture containing an olefin such as ethylene and alpha-olefin. For example, the maleic anhydride-modified olefin copolymer may be prepared by a reactive extrusion method in which a peroxide is added to an olefin copolymer to break an ethylene bond and generate a free radical to introduce maleic anhydride into an ethylene bond.

[0137] In a specific example, the maleic anhydride-modified olefin copolymer may include at least one of maleic anhydride-grafted ethylene-octene rubber (MAH-g-EOR), maleic anhydride-grafted ethylene-butene rubber (MAH-g-EBR), maleic anhydride-grafted ethylene-propylene-diene terpolymer (MAH-g-EPDM), and maleic anhydride-grafted styrene-ethylene-butylene-styrene (MAH-g-SEBS).

[0138] In a specific example, among the total 100 wt% of the maleic anhydride-modified olefin copolymer, the content of the maleic anhydride may be about 0.1 to about 10 wt%, and the content of the olefin copolymer may be about 90 to about 99.9 wt%, but is not limited thereto.

[0139] In a specific example, the maleic anhydride-modified olefin copolymer may be included in an amount of about 0.1 to about 5 parts by weight, for example, about 1 to about 4 parts by weight, based on about 100 parts by weight of the base material. If the amount of the maleic anhydride-modified olefin copolymer is less than about 0.1 parts by weight based on about 100 parts by weight of the base material, there is a concern that the shrinkage resistance, etc. of the liquid crystal polymer composition (molded product) may be reduced, and if it exceeds about 5 parts by weight, there is a concern that the weld strength, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be reduced.

[0140] In a specific example, the weight ratio of the sum of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure and the maleic anhydride-modified olefin copolymer ((modified olefin copolymer containing an epoxy group + impact modifier having a core-shell structure) : maleic anhydride-modified olefin copolymer) may be from about 1:0.1 to about 1:1, for example, from about 1:0.15 to about 1:0.8. In the above range, the appearance characteristics of the liquid crystal polymer composition (molded product) may be more excellent.

[0141] In a specific example, the weight ratio of the modified olefin copolymer including the epoxy group and the maleic anhydride modified olefin copolymer may be from about 1:0.2 to about 1:2, for example from about 1:0.3 to about 1:1.7. In this range, the weld strength, crack resistance, appearance characteristics, etc. of the liquid crystal polymer composition (molded product) may be more excellent.

[0142]

[0143] The liquid crystal polymer composition according to one embodiment of the present invention may further include additives included in conventional liquid crystal polymer compositions. Examples of the additives include, but are not limited to, antioxidants, flame retardants, anti-drip agents, lubricants, release agents, nucleating agents, antistatic agents, heat stabilizers, UV 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.

[0144]

[0145] A liquid crystal polymer 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 330 to about 370°C, for example, about 340 to about 360°C, using a conventional twin-screw extruder.

[0146] In a specific example, the liquid crystal polymer composition may have a weld strength of about 5 to about 8 N, for example, about 5.5 to about 7.5 N, of an injection molded specimen having a size of 8 mm × 8 mm × 0.2 mm, measured by pulling the specimen at a speed of 0.5 mm / s in the direction in which a weld line occurs using a push-pull device (manufacturer: IMADA Inc., device name: MX-500N, push-pull gauge: IMADA DST-500N).

[0147] In a specific example, the liquid crystal polymer composition is formed by injection molding a CCM actuator housing and a carrier actual part having a size of 8 mm × 8 mm × 0.2 mm, inserting a ceramic bearing ball therein, assembling the CCM actuator, exposing the CCM actuator assembly to a 25 kHz vibration condition for 12 hours using a vibration tester, and then disassembling the assembly, and measuring the surface dent depth of the CCM actuator housing with a 3D optical profilometer may be about 4 μm or less, for example, about 2 to about 3.5 μm.

[0148] In a specific example, the liquid crystal polymer composition may be subjected to a tumbler evaluation in which a Lego block-shaped specimen having 8 protrusions and 32 mm × 16 mm × 9 mm in size is placed in a tumbler having 30 cm × 30 cm × 100 cm in size and rotated 2,000 times under conditions of 7 rpm, and the measured dust generation amount may be about 10 to about 110 ppm, for example, about 20 to about 105 ppm, according to the following Equation 1:

[0149] [Formula 1]

[0150] Dust production = (W1 - W2) / W1

[0151] In the above equation 1, W1 is the weight of the specimen before tumbler evaluation, and W2 is the weight of the specimen after tumbler evaluation.

[0152]

[0153] A molded article according to the present invention is formed from the liquid crystal polymer composition. The liquid crystal polymer 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 weld strength, dent resistance, and appearance characteristics, and generates little dust, and is useful for manufacturing surface-mount electronic devices including switches, relays, connectors, condensers, coils, transformers, camera modules, antennas, and chip antenna switches, and devices mounted using lead-free solder processed at higher temperatures. For example, the molded article can be a compact camera module component, etc.

[0154]

[0155] 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.

[0156]

[0157] Example

[0158] Below, the specifications of each component used in the examples and comparative examples are as follows.

[0159] (A) Liquid crystal polymer

[0160] 4-Hydroxybenzoic acid / 6-hydroxy-2-naphthoic acid / terephthalic acid / 4,4'-dihydroxybiphenyl / N-acetyl-4-aminophenol copolymer (Cas no. 147310-94-9) was used.

[0161] (B) Polyester resin

[0162] Polyethylene terephthalate (PET, manufacturer: Lotte Chemical, intrinsic viscosity: approximately 0.765 dl / g) was used.

[0163] (C) Micah

[0164] Mica (Manufacturer: Imerys SA, Product name: WG-325, Average particle size (D50): approx. 35 ㎛) was used.

[0165] (D) Nanocompounds

[0166] (D1) Carbon black (manufacturer: Lion Specialty Chemical Co., Ltd., product name: Ketjenblack EC-600JD) was used as a conductive nanocompound.

[0167] (D2) As an oxide nanocompound, spinel copper chromate (spinel CuCr2O4, manufacturer: Shepherd Technologies, product name: Copper Chromite Black Spinel) was used.

[0168] (E) Modified olefin copolymer containing an epoxy group

[0169] Random ethylene-methyl acrylate-glycidyl methacrylate terpolymer (Manufacturer: SK Functional Polymer, Product name: LOTADER AX-8900) was used.

[0170] (F) Core-shell structure impact modifier

[0171] A core-shell structured impact modifier (Methyl methacrylate-butadiene-ethyl acrylate copolymer with PMMA Shell, Manufacturer: Dow, Product Name: PARALOID EXL-2602) was used, in which polymethyl methacrylate was graft-polymerized onto a methyl methacrylate-butadiene-ethyl acrylate rubber copolymer.

[0172] (G) Maleic anhydride modified olefin copolymer

[0173] Maleic anhydride graft polymerized ethylene-octene rubber (MAH-g-EOR, manufacturer: Dow, product name: FUSABOND MN493D) was used.

[0174]

[0175] Examples 1 to 14 and Comparative Examples 1 to 14

[0176] Each of the above components was added in the contents as shown in Tables 1, 2, 3, and 4 below, and then extruded at about 350°C to produce pellets. The extrusion was performed using a twin-screw extruder with an L / D of 44 and a diameter of 45 mm. The manufactured pellets were dried at about 80°C for about 4 hours or more, and then injection-molded in a 150-ton injection molding machine (molding temperature: about 340°C, mold temperature: about 100°C) to produce specimens. The physical properties of the manufactured specimens were evaluated by the following methods, and the results are shown in Tables 1, 2, 3, and 4 below.

[0177]

[0178] Method of measuring physical properties

[0179] (1) Weld strength (unit: N): Using a push-pull device (manufacturer: IMADA Inc., device name: MX-500N, push-pull gauge: IMADA DST-500N), a specimen measuring 8 mm × 8 mm × 0.2 mm was pulled at a speed of 0.5 mm / s in the direction in which the weld line was generated, and then the peak force was measured.

[0180] (2) Surface dent depth (unit: ㎛): The CCM actuator housing and carrier actual parts with sizes of 8 mm × 8 mm × 0.2 mm were injected, ceramic bearing balls were inserted, and the CCM actuator was assembled. The CCM actuator assembly was exposed to 25 kHz vibration conditions for 12 hours using a vibration tester, and the assembly was disassembled, and the surface dent depth of the CCM actuator housing was measured using a 3D optical profilometer (manufacturer: VEECO, device name: Wyko NT1100 Optical Profiling System).

[0181] (3) Dust generation amount (unit: ppm): A Lego block-shaped specimen measuring 32 mm × 16 mm × 9 mm with 8 protrusions was placed in a tumbler measuring 30 cm × 30 cm × 100 cm, rotated 2,000 times under conditions of 7 rpm, and the dust generation amount of the specimen was calculated according to Equation 1 below.

[0182] [Formula 1]

[0183] Dust production = (W1 - W2) / W1

[0184] In the above equation 1, W1 is the weight of the specimen before tumbler evaluation, and W2 is the weight of the specimen after tumbler evaluation.

[0185] (4) Appearance evaluation: After ultrasonic cleaning of a 3.2 mm thick tensile strength test specimen according to ASTM D638 standard in an ultrasonic cleaner containing deionized water for 30 minutes under the conditions of 40 kHz and 150 W, the appearance of the specimen was checked for whitening (no whitening: OK, whitening: NG).

[0186]

[0187] Example 1234567(A) (% by weight)94969896969696(B) (% by weight)6424444(C) (parts by weight)23.423.423.4153023.423.4(D1) (parts by weight)3.23.23.23.23.227(D2) (parts by weight)-------(E) (parts by weight)2.42.42.42.42.42.42.42.4(F) (parts by weight)3.23.23.23.23.23.23.2(E):(F) (weight ratio)1:1.31:1.31:1.31:1.31:1.31:1.31:1.3(G) (parts by weight)2.52.52.52.52.52.52.5Weld Strength (N) 6.2 6.3 6.5 6.0 7.1 6.5 6.1 Surface dent depth (㎛) 2.6 2.5 2.5 2.8 2.6 2.9 3.0 Dust generation (ppm) 60 50 40 30 75 6 590 Appearance evaluation OK OK OK OK OK OK

[0188] * Weight parts: Weight parts per 100 weight parts of basic material (A+B)

[0189]

[0190] Example 891011121314(A) (Wt%)96969696969696(B) (Wt%)4444444(C) (Wt)23.423.423.423.423.423.423.4(D1) (Wt)-3.23.23.23.23.23.2(D2) (Wt)3.2------(E) (Wt)2.41.64.02.42.42.42.42.4(F) (Wt)3.23.23.22.04.23.23.2(E):(F) (Weight ratio)1:1.31:2.01:0.81:0.831:1.751:1.31:1.3(G) (Weight) 2.5 2.5 2.5 2.5 2.5 1.0 4.0 Weld strength (N) 5.8 6.6 6.16 36.16 86.2 Surface dent depth (㎛) 3.0 3.3 2.5 3.0 2.8 3.2 2.6 Dust generation (ppm) 100 60 55 65 60 70 90 Appearance evaluation OK OK OK OK OK OK

[0191] * Weight parts: Weight parts per 100 weight parts of basic material (A+B)

[0192]

[0193] Comparative Example 1234567(A) (Wt%)901009696969696(B) (Wt%)10-44444(C) (Wt%)23.423.454023.423.423.4(D1) (Wt%)3.23.23.23.20.5123.2(D2) (Wt%)-------(E) (Wt%)2.42.42.42.42.42.40.01(F) (Wt%)3.23.23.23.23.23.23.2(E):(F) (Weight Ratio)1:1.31:1.31:1.31:1.31:1.31:1.31:320(G) (Weight) 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 Weld strength (N) 5.5 6.2 3.6 7.26 3.26 1 Surface dent depth (㎛) 3.6 3.0 6.5 5.5 3.24 25.5 Dust generation (ppm) 90 120 30 300 150 420 90 Appearance evaluation NGNGOKOKNGOKOK

[0194] * Weight parts: Weight parts per 100 weight parts of basic material (A+B)

[0195]

[0196] Comparative Example 891011121314(A) (Weight%) 96969696969696(B) (Weight%) 4444444(C) (Weight parts) 23.423.423.423.423.423.423.4(D1) (Weight parts) 3.23.23.23.23.23.23.2(D2) (Weight parts)-------(E) (Weight parts) 62.42.42.42.450.1(F) (Weight parts) 3.20.0163.23.20.15(E):(F) (Weight ratio) 1:0.531:0.0041:2.51:1.31:1.31:0.021:50(G) (Weight) 2.5 2.5 2.5 0.0 16 2.5 2.5 Weld strength (N) 3.3 6.5 3.2 6.0 3.4 4.0 5.1 Surface dent depth (㎛) 3.1 4.4 3.2 5.2 2.9 3.8 7.6 Dust generation (ppm) 80 100 95 80 100 90 80 Appearance evaluation NGOKOKOKNGNGOK

[0197] * Weight parts: Weight parts per 100 weight parts of basic material (A+B)

[0198]

[0199] From the above results, it can be seen that the liquid crystal polymer composition of the present invention has excellent weld strength, dent resistance (surface dent depth), appearance characteristics (appearance evaluation), etc., and generates less dust.

[0200] On the other hand, in the case of Comparative Example 1, where a small amount of liquid crystal polymer was applied and an excessive amount of polyester resin was applied, it can be seen that the appearance characteristics, etc. were deteriorated, and in the case of Comparative Example 2, where an excessive amount of liquid crystal polymer was applied and a small amount of polyester resin was applied, it can be seen that the appearance characteristics, dust generation reduction effect, etc. were deteriorated. In the case of Comparative Example 3, where a small amount of mica was applied, it can be seen that the weld strength and dent resistance, etc. were deteriorated, and in the case of Comparative Example 4, where an excessive amount of mica was applied, it can be seen that the dent resistance and dust generation reduction effect, etc. were deteriorated. In the case of Comparative Example 5, where a small amount of nano-compound was applied, it can be seen that the appearance characteristics, dust generation reduction effect, etc. were deteriorated. In the case of Comparative Example 6, where a large amount of nano-compound was applied, it can be seen that the weld strength, dent resistance, dust generation reduction effect, etc. were deteriorated. In the case of Comparative Example 7, where a small amount of a modified olefin copolymer containing an epoxy group was applied, it can be seen that the dent resistance, etc. were reduced, and in the case of Comparative Example 8, where an excessive amount of a modified olefin copolymer containing an epoxy group was applied, it can be seen that the weld strength, appearance characteristics, etc. were reduced. In the case of Comparative Example 9, where a small amount of a core-shell structured impact modifier was applied, it can be seen that the dent resistance, etc. were reduced, and in the case of Comparative Example 10, where an excessive amount of a core-shell structured impact modifier was applied, it can be seen that the weld strength, etc. were reduced. In the case of Comparative Example 11, where a small amount of a maleic anhydride-modified olefin copolymer was applied, it can be seen that the dent resistance, etc. were reduced, and in the case of Comparative Example 12, where an excessive amount of a maleic anhydride-modified olefin copolymer was applied, it can be seen that the weld strength, appearance characteristics, etc. were reduced.In addition, even if the content of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure is within the scope of the present invention, in the case of Comparative Example 13, where the weight ratio of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure is less than the scope of the present invention, it can be seen that the weld strength, appearance characteristics, etc. are deteriorated, and in the case of Comparative Example 14, where the weight ratio of the modified olefin copolymer containing an epoxy group and the impact modifier having a core-shell structure exceeds the scope of the present invention, it can be seen that the dent resistance, etc. are deteriorated.

[0201]

[0202] 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 91 to about 99 weight% of a liquid crystal polymer and about 1 to about 9 weight% of a polyester resin; About 10 to about 35 parts by weight of mica; About 1 to about 10 parts by weight of a nanocompound comprising at least one of a conductive nanocompound and an oxide nanocompound; About 0.1 to about 5 parts by weight of a modified olefin copolymer containing an epoxy group; About 0.1 to about 5 parts by weight of an impact modifier having a core-shell structure; and Contains about 0.1 to about 5 parts by weight of a maleic anhydride modified olefin copolymer; A liquid crystal polymer composition characterized in that the weight ratio of the modified olefin copolymer containing the epoxy group and the impact modifier having the core-shell structure is about 1:0.5 to about 1:

3.

2. A liquid crystal polymer composition according to claim 1, characterized in that the liquid crystal polymer has a crystalline melting point of about 280 to about 360°C.

3. A liquid crystal polymer composition according to claim 1 or 2, characterized in that the polyester resin comprises at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate, and polycyclohexylenedimethylene terephthalate.

4. A liquid crystal polymer composition according to any one of claims 1 to 3, wherein the mica has an average particle size of about 15 to about 50 μm.

5. A liquid crystal polymer composition according to any one of claims 1 to 4, wherein the conductive nanocompound comprises at least one of carbon black, graphite, expanded graphite, graphene, carbon nanotubes, carbon fibers, and metal nanoparticles.

6. A liquid crystal polymer composition according to any one of claims 1 to 5, wherein the oxide nano-compound comprises at least one of barium sulfate, silica, spinel copper chromate, and alumina.

7. A liquid crystal polymer composition according to any one of claims 1 to 6, wherein the modified olefin copolymer containing an epoxy group comprises at least one of a glycidyl (meth)acrylate modified ethylene-methyl acrylate copolymer, a glycidyl (meth)acrylate modified polyethylene, a glycidyl (meth)acrylate modified ethylene-ethyl acrylate copolymer, and a glycidyl (meth)acrylate modified ethylene-butyl acrylate copolymer.

8. A liquid crystal polymer composition according to any one of claims 1 to 7, wherein the impact modifier of the core-shell structure is a liquid crystal polymer composition characterized in that an unsaturated compound including at least one of an acrylic monomer, an aromatic vinyl monomer, and a cyanide vinyl monomer is graft-polymerized onto a rubbery polymer.

9. A liquid crystal polymer composition according to any one of claims 1 to 8, wherein the maleic anhydride-modified olefin copolymer comprises at least one of an ethylene-octene rubber graft-polymerized with maleic anhydride, an ethylene-butene rubber graft-polymerized with maleic anhydride, an ethylene-propylene-diene terpolymer graft-polymerized with maleic anhydride, and a styrene-ethylene-butylene-styrene graft-polymerized with maleic anhydride.

10. A liquid crystal polymer composition according to any one of claims 1 to 9, characterized in that the weight ratio of the modified olefin copolymer containing the epoxy group and the maleic anhydride modified olefin copolymer is about 1:0.2 to about 1:

2.

11. A liquid crystal polymer composition according to any one of claims 1 to 10, characterized in that the liquid crystal polymer composition has a weld strength of about 5 to about 8 N of an injection molded specimen measuring 8 mm × 8 mm × 0.2 mm when pulled at a speed of 0.5 mm / s in the direction in which a weld line occurs using a push-pull device.

12. A liquid crystal polymer composition according to any one of claims 1 to 11, characterized in that the liquid crystal polymer composition is formed by injection molding a CCM actuator housing and a carrier actual part having a size of 8 mm × 8 mm × 0.2 mm, inserting a ceramic bearing ball therein, assembling the CCM actuator, exposing the CCM actuator assembly to a 25 kHz vibration condition for 12 hours using a vibration tester, and then disassembling the assembly, and measuring the surface dent depth of the CCM actuator housing with a 3D optical profiler is about 4 ㎛ or less.

13. In any one of claims 1 to 12, the liquid crystal polymer composition is characterized in that the amount of dust generated is about 10 to about 110 ppm, measured according to the following formula 1, after a tumbler evaluation in which a Lego block-shaped specimen having 8 protrusions and 32 mm × 16 mm × 9 mm in size is placed in a tumbler having 30 cm × 30 cm × 100 cm in size and rotated 2,000 times under the condition of 7 rpm: [Formula 1] Dust production = (W1 - W2) / W1 In the above equation 1, W1 is the weight of the specimen before tumbler evaluation, and W2 is the weight of the specimen after tumbler evaluation.

14. A molded product characterized by being formed from a liquid crystal polymer composition according to any one of claims 1 to 13.

15. A molded product according to claim 14, characterized in that the molded product is a compact camera module component.