KR20170063496A - Polycarbonate resin composition having improved appearance and flowability - Google Patents

Abstract

The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition which is excellent in appearance and fluidity and contains a polycarbonate resin, an inorganic filler and a Tg regulator, and is thus suitable as a casing material for mobile phones and the like.

Description

[0001] POLYCARBONATE RESIN COMPOSITION HAVING IMPROVED APPEARANCE AND FLOWABILITY [0002]

The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition which is improved in appearance and fluidity and is suitable as a casing of electronic equipment such as a mobile phone.

The inorganic filler-reinforced thermoplastic resin has high flexural strength and can exhibit excellent rigidity, and thus has been applied to some parts such as automobiles and electronic devices. However, when an inorganic filler is added to a thermoplastic resin, the impact resistance is greatly reduced, making it difficult to use in parts that are susceptible to breakage due to an external impact. Since the fluidity is significantly lowered, .

Among these inorganic filler-reinforced thermoplastic resins, the glass fiber-reinforced polycarbonate resin has an advantage that the tensile and flexural strength can be improved while maintaining excellent moldability of the polycarbonate resin. In particular, these resins exhibit excellent flexural modulus and heat resistance, and are therefore suitable for parts which are subjected to a continuous load or which must withstand constant heat, and thus have been mainly used as outer sheaths for electronic devices such as mobile phones.

However, in the case of glass fiber reinforced polycarbonate resin, it has an advantage of excellent impact resistance compared to other glass fiber reinforced thermoplastic resin. However, glass fiber protrudes on the surface after injection to deteriorate the outer appearance. In order to prevent appearance deterioration and improve fluidity, additives There is a problem that the impact resistance is reduced.

Korean Patent Laid-Open No. 10-2009-0018569 discloses a glass fiber-reinforced polycarbonate having excellent flowability and impact resistance by adding a modified polyolefin. However, since the improvement of fluidity is still insufficient, the appearance of the article is deteriorated and blasting There is a problem that an additional process is required.

In order to solve the above problems, it is an object of the present invention to provide a polycarbonate resin composition having improved appearance and fluidity. More specifically, there is provided a polycarbonate resin composition improved in appearance and fluidity without decreasing mechanical properties by including a glass transition temperature adjusting agent (hereinafter referred to as a Tg adjusting agent) containing phosphorus in a polycarbonate resin reinforced with an inorganic filler to reduce Tg .

It is another object of the present invention to provide a molded article made of a polycarbonate resin composition.

In order to accomplish the above object, the present invention provides a thermoplastic resin composition comprising (A) a polycarbonate resin; (B) an inorganic filler; And (C) a phosphorus-containing Tg regulator. The present invention relates to a polycarbonate resin composition having improved appearance and flowability.

According to one embodiment of the present invention, it is possible to contain 50 to 85% by weight of the polycarbonate resin (A), 10 to 40% by weight of the inorganic filler (B) and 1 to 10% by weight of a Tg regulator containing phosphorus have.

According to an embodiment of the present invention, the (A) polycarbonate resin may have a weight average molecular weight (Mw) of 10,000 to 200,000 g / mol.

According to an embodiment of the present invention, the inorganic filler may be selected from at least one of glass fiber, carbon fiber, ceramic fiber, calcium carbonate, silica, alumina, aluminum hydroxide, talc, clay, mica, barium sulfate and whiskers.

According to one embodiment of the present invention, the Tg modifier containing (C) phosphorus may be a compound having the structure of the following formula (1): < EMI ID =

[Chemical Formula 1]

Wherein R ₁ to R ₆ are each independently selected from the group consisting of hydrogen, halogen, (C 1 -C 20) alkyl, (C 2 -C 7) alkenyl, (C 3 -C 20) cycloalkyl, (C 2 -C 20) heterocycloalkyl (C1-C10) alkoxy, (C6-C20) aryl, (C5-C20) heteroaryl, (C1- C10) alkoxycarbonyl Roxy, < / RTI >

(C 1 -C 10) alkyl, halogen, nitro, cyano, hydroxy, amino, (C 6 -C 10) aryl, (C 3 -C 10) alkyl, alkenyl, cycloalkyl, heterocycloalkyl, alkoxycarbonylalkyl, -C10) cycloalkyl, (C3-C10) heterocycloalkyl or (C4-C10) heteroaryl.

According to one embodiment of the present invention, the Tg regulator containing (C) phosphorus may be selected from at least one compound having the structure of the following formulas (2) to (4)

(2)

(3)

[Chemical Formula 4]

In Formula 4, R ₁₁ to R ₆₁ each independently may be selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl or benzyl.

According to an embodiment of the present invention, the polycarbonate resin composition may contain at least one selected from the group consisting of an antimicrobial agent, a heat stabilizer, an antioxidant, a releasing agent, a light stabilizer, a surfactant, a coupling agent, a plasticizer, a compatibilizer, a lubricant, an antistatic agent, An additive selected from the group consisting of a flame retardant, a flame retardant aid, a dripping inhibitor, a sealant, an ultraviolet absorber, an ultraviolet screener, and a mixture thereof.

In order to achieve the above object, the present invention relates to a molded article produced from the above-described polycarbonate resin composition.

According to one embodiment of the present invention, the molded article may satisfy the following formulas 1 to 3:

50? Gloss? 90 [Formula 1]

80? Yp? 100 [Formula 2]

150 ≤ Spiral length ≤ 200 [Formula 3]

In Equation (1), Gloss is an average value of 60 ° gloss (gloss value) measured by a gloss meter using a rectangular shaped injection specimen having a size of 9 cm x 5 cm. In Equation 2, Y p is a value of 10 cm x 10 cm x 1 cm (%), Which is determined by naked eye and determined by the number of good products except for defects, and the spiral length is 1 mm in thickness and 1 cm in width (Mm) measured by injection molding at 310 DEG C using a spiral mold.

According to an embodiment of the present invention, the molded article may be a cellular phone casing.

The polycarbonate resin composition according to the present invention can remarkably improve appearance and fluidity without deteriorating the mechanical properties such as impact resistance and flexural modulus, and thus can solve the problem of projecting inorganic filler in the appearance of the molded article and drastically improve the coating yield There is an advantage. Therefore, it has an advantage of providing excellent surface and physical properties as an exterior material for electronic devices such as a mobile phone without additional processing steps because of its excellent appearance at the time of manufacturing a molded product.

1 is a photomicrograph of a molded article produced using a polycarbonate resin composition according to an embodiment of the present invention and photographing whether the unevenness is formed on a coated surface.

Hereinafter, the polycarbonate resin composition of the present invention will be described in detail. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. It will be apparent to those skilled in the art that, unless otherwise defined, technical terms and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, And a description of the known function and configuration will be omitted.

The inventors of the present invention have conducted studies to develop a polycarbonate resin composition having excellent flowability without deteriorating mechanical properties such as impact resistance and excellent molding processability and appearance characteristics. As a result, it has been found that a polycarbonate resin composition containing a polycarbonate resin, The present inventors have found that the polycarbonate resin composition containing the Tg modifier can remarkably improve the appearance and the coating yield without significantly deteriorating the mechanical properties of the impact resistance and flexural modulus, .

Hereinafter, each component will be described in more detail.

The polyester resin composition of the present invention comprises (A) a polycarbonate resin, (B) an inorganic filler and (T) a Tg regulator containing phosphorus.

Hereinafter, each component will be described in more detail.

(A) Polycarbonate resin

The polycarbonate resin according to one embodiment of the present invention can exhibit mechanical properties such as rigidity and impact strength, appearance characteristics and excellent molding processability. It is not limited as long as it is a polycarbonate resin produced by a conventional method. For example, aliphatic polycarbonate resins, aromatic polycarbonate resins, copolycarbonate resins, copolyestercarbonate resins, polycarbonate-polysiloxane copolymer resins or mixtures thereof may be used. More specifically, an aromatic polycarbonate resin may be used.

The polycarbonate resin may be a linear polycarbonate resin, a branched polycarbonate resin, or a mixture of linear and branched polycarbonate resins, but not limited thereto.

 The polycarbonate resin according to one embodiment of the present invention can be prepared by reacting (A1) an aromatic dihydroxy compound with (A2) carbonate precursor.

(A1) an aromatic dihydroxy compound

The aromatic dihydroxy compound (A1) may be a compound represented by the following formula (5) or a mixture thereof.

[Chemical Formula 5]

In Formula 5, X ₁ and X ₂ are each independently hydrogen, halogen, or a C ₁ -C ₈ alkyl group; a and b are each independently an integer of 0 to 4; Z is a single bond, a C ₁ -C ₈ alkylene group, a C ₂ -C ₈ alkylidene group, a C ₅ -C ₁₅ cycloalkylene group, a C A cycloalkylidene group of _{5 to 15} , -S-, -SO-, SO ₂ -, -O-, or -CO-.

Examples of the aromatic dihydroxy compound (a1) represented by the formula (5) include bis (hydroxyaryl) alkane, bis (hydroxyaryl) cycloalkane, bis (hydroxyaryl) ether, bis (hydroxyaryl) sulfide, bis Hydroxyaryl) sulfoxide, and biphenyl compounds may be used, and these compounds may be used singly or in a mixture of two or more.

Specifically, examples of the bis (hydroxyaryl) alkane include bis (4-hydroxyphenyl) methane, bis (3-methyl-4-hydroxyphenyl) methane, bis (3,5-dibromo-4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1- 3-methylphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,2- (2-tert-butyl-4-hydroxyphenyl) propane, 2,2-bis (3,5- 4-hydroxyphenyl) propane, 2,2-bis (3-chloro-4-hydroxyphenyl) propane, 2,2- Bis (3,5-difluoro-4-hydroxyphenyl) propane, 2,2-bis Hydroxyphenyl) propane, 2,2-bis (3,5-dibromo-4-hydroxyphenyl ) Propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) (4-hydroxy-1-methylphenyl) propane, 1,1-bis (4-hydroxy-tertiary-butylphenyl) propane, 2,2- Bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy- (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy- Propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2- Bis (3-methyl-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxyphenyl) butane, 2,2- Butyl-4-hydroxy-5-methylphenyl) butane, 1,1-bis (2-tertiary- Aminopropyltrimethoxysilane, 1,1-bis (2-tertiary-butyl-4-hydroxy-5-methylphenyl) isobutane, ) Butane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) heptane, 1,1-bis (2-tertiary- 1- (4-hydroxyphenyl) ethane, but is not limited thereto.

Specific examples of the bis (hydroxyaryl) cycloalkane include 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, (3-phenyl-4-hydroxyphenyl) cyclohexane, 1,1-bis (3-cyclohexyl-4-hydroxyphenyl) cyclohexane, , Or 1,1-bis (4-hydroxyphenyl) -3,5,5-trimethylcyclohexane, but are not limited thereto.

Specifically, examples of the bis (hydroxyaryl) ether include, but are not limited to, bis (4-hydroxyphenyl) ether or bis (4-hydroxy-3-methylphenyl) ether.

Specifically, examples of bis (hydroxyaryl) sulfide include, but are not limited to, bis (4-hydroxyphenyl) sulfide or bis (3-methyl-4-hydroxyphenyl) sulfide.

Specific examples of the bis (hydroxyaryl) sulfoxide include bis (hydroxyphenyl) sulfoxide, bis (3-methyl-4-hydroxyphenyl) sulfoxide or bis Side, but is not limited thereto.

Specific examples of the biphenyl compound include bis (4-hydroxyphenyl) sulfone, bis (3-methyl-4-hydroxyphenyl) sulfone, bis Hydroxyaryl) sulfone, 4,4'-dihydroxybiphenyl, 4,4'-dihydroxy-2,2'-dimethylbiphenyl, 4,4'-dihydroxy-3,3'-dimethyl Biphenyl, 4,4'-dihydroxy-3,3'-dicyclobiphenyl, 3,3-difluoro-4,4'-dihydroxybiphenyl, but are not limited thereto.

Examples of the aromatic dihydroxy compound (A1) that can be used in addition to the compound represented by the formula (5) include dihydroxybenzene, halogen, or alkyl-substituted dihydroxybenzene.

Specifically, there can be mentioned, for example, resorcinol, 3-methyl resorcinol, 3-ethyl resorcinol, 3-propyl resorcinol, 3-butyl resorcinol, 3-tertiary butyl resorcinol, , 2,3,4,6-tetrafluororesorcinol, 2,3,4,6-tetrabromorezorcinol, catechol, hydroquinone, 3-methylhydroquinone, 3-ethylhydroquinone, 3 -Propylhydroquinone, 3-butylhydroquinone, 3-tertiary-butylhydroquinone, 3-phenylhydroquinone, 3-silylhydroquinone, 2,5-dichlorohydroquinone, 2,3,5,6-tetramethyl Hydroquinone, 2,3,5,6-tetra-tertiary-butylhydroquinone, 2,3,5,6-tetraprourohydroquinone, or 2,3,5,6-tetrabromohydroquinone is used But is not limited thereto.

The aromatic dihydroxy compound (A1) is preferably 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

(A2) carbonate precursor

The carbonate precursor may be at least one selected from the group consisting of dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate, diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, ) Carbonate, carbonyl chloride (phosgene), triphosgene, diphosgene, carbonyl bromide, bishaloformate, and the like. These compounds may be used singly or in a mixture of two or more.

The carbonate precursor (A2) may be used in a molar ratio of 0.9 to 1.5 based on 1 mole of the aromatic dihydroxy compound (A1).

The polycarbonate resin according to one embodiment of the present invention may have a weight average molecular weight (Mw) of 10,000 to 200,000 g / mol, and more preferably 15,000 to 80,000 g / mol. In this case, the workability can be improved.

The content of the polycarbonate resin (A) according to an embodiment of the present invention may be 50 to 85% by weight in the total composition. And more preferably 60 to 75% by weight. When the content is in the above range, the impact resistance, thermal stability and moldability can be further improved.

 (B) inorganic filler

The inorganic filler according to one embodiment of the present invention can be added to the polycarbonate resin to improve the strength of the resin. The shape and kind of the inorganic filler can be used without limitation as long as they are well known in the art.

For example, fibrous inorganic filler including glass fiber, carbon fiber, ceramic fiber, metal fiber and the like, or at least one of calcium carbonate, silica, alumina, aluminum hydroxide, talc, clay, mica, barium sulfate and whiskers have.

Such an inorganic filler may have various cross-sectional shapes such as a circle, an ellipse, and a rectangle.

More specifically, the inorganic filler of the present invention is preferably a glass fiber, and glass fibers of any kind and shape can be used.

The glass fiber according to one embodiment of the present invention may be a cylindrical cross-section glass fiber or a plate-shaped glass fiber. The cylindrical cross-section glass fiber may have a cross-sectional diameter of 5 to 20 μm and a length of 2 to 5 mm before machining. The plate-like glass fibers may have an aspect ratio of 1.5 to 10 in cross section and a length of 2 to 5 mm before processing. In this case, the workability is improved, and not only the mechanical properties such as the tensile strength, the impact resistance and the flexural modulus of the molded article but also the appearance characteristics of the article can be improved.

The inorganic filler may be one having a surface coated with a surface treatment agent to increase the bonding force with the polycarbonate resin. The surface treatment agent may be, for example, a silane compound, a urethane compound or an epoxy compound, but is not limited thereto.

The content of the inorganic filler (B) according to an embodiment of the present invention may be 10 to 40% by weight in the total composition. More preferably 20 to 35% by weight. If the content of the inorganic filler is less than 10% by weight, the impact resistance and heat resistance may decrease. If it is more than 40% by weight, the flowability is decreased and molding processability is decreased, and the inorganic filler may protrude when it is injected into a molded product, resulting in a problem that the appearance is deteriorated.

 (C) a phosphorus-containing Tg regulator

The phosphorus-containing Tg modifier according to one embodiment of the present invention can improve the fluidity by lowering the glass transition temperature (Tg) of the polycarbonate resin.

The phosphorus-containing Tg modifier may be phosphate, phosphonate, phosphinate, phosphine oxide or phosphazene.

More preferably, linear or cyclic phosphazene can be used.

The Tg modifier containing phosphorus (C) according to one embodiment of the present invention may be selected from compounds having the structure of the following formula (1).

[Chemical Formula 1]

(In Formula 1, R ₁ to R ₆ are each independently, hydrogen, halogen, (C1-C20) alkyl, (C2-C7) alkenyl, (C3-C20) cycloalkyl, (C2-C20) heterocycloalkyl (C1-C60) alkyl, (C1-C60) alkoxy, (C6-C20) aryl, (C5-C20) heteroaryl, (C1-C10) alkoxycarbonyl Lt; / RTI > may be selected from hydroxy,

(C 1 -C 10) alkyl, halogen, nitro, cyano, hydroxy, amino, (C 6 -C 10) aryl, (C 3 -C 10) alkyl, alkenyl, cycloalkyl, heterocycloalkyl, alkoxycarbonylalkyl, -C10) cycloalkyl, (C3-C10) heterocycloalkyl or (C4-C10) heteroaryl.

The substituents comprising the "alkyl", "alkoxy" and other "alkyl" moieties described in this invention include all straight-chain or branched forms and "alkenyl" refers to an alkyl group having from 2 to 8 carbon atoms and having at least one double bond And the like.

"Cycloalkyl" as used in the present invention includes both saturated monocyclic or saturated bicyclic ring structure forms having 3 to 20 carbon atoms.

"Aryl ", as used herein, refers to an organic radical derived from an aromatic hydrocarbon by the removal of one hydrogen, with a single or fused ring containing in each ring suitably 4 to 7, preferably 5 or 6 ring atoms . Specific examples include, but are not limited to, phenyl, naphthyl, biphenyl, tolyl, and the like.

"Heterocycloalkyl" as used herein refers to a saturated cyclic hydrocarbon skeletal atom containing 1 to 3 heteroatoms selected from N, O, S and the remaining saturated monocyclic or bicyclic ring skeletal atom carbon Alkyl group which may be substituted with at least one substituent selected from the group consisting of pyrrolidinyl, azetidinyl, pyrazolidinyl, oxazolidinyl, piperidinyl, piperazinyl, morpholinyl, thiomorpholinyl, thiazolidinyl, Wherein the substituent is selected from the group consisting of alkyl, alkoxy, alkylthio, alkylthio, alkylthio, alkylthio, alkylthio, alkylthio, alkylthio, alkylthio, Tetrahydropyrimidinyl, tetrahydropyrimidinyl, tetrahydrothiophenyl, tetrahydrothiopyranyl, diazepanyl, and azepanyl.

"Heteroaryl" as used in the present invention means an aryl group having 1 to 3 hetero atoms selected from N, O, S as an aromatic ring skeletal atom and the remaining aromatic ring skeletal atoms carbon, Include heteroaryl groups in the ring which are oxidized or tanned to form, for example, N-oxides or quaternary salts. Specific examples include furyl, thiophenyl, pyrrolyl, pyranyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, isoxazolyl, oxazolyl, oxadiazolyl, triazinyl, tetrazinyl, tri Pyrimidinyl, pyridazinyl, and the like, including, but not limited to, pyrimidinyl, pyrimidinyl, pyridazinyl, pyridazinyl,

More specifically, the Tg modifier containing phosphorus (C) of the present invention may be selected from at least one compound having a structure represented by any of the following formulas (2) to (4).

(2)

(3)

[Chemical Formula 4]

(Wherein R ₁₁ to R ₆₁ each independently represent hydrogen, methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl or benzyl)

When using a phosphorus-containing Tg regulator selected from the above Chemical Formulas 2 to 4, the Tg of the polycarbonate resin can be reduced to improve fluidity and maintain excellent mechanical properties.

The content of the phosphorus-containing Tg regulator (C) according to an embodiment of the present invention may be 1 to 10% by weight in the total composition. More preferably 1 to 5% by weight. If the content of the Tg regulator is less than 1% by weight, the effect of decreasing the Tg of the polycarbonate resin may be insignificant and the liquidity improvement may not be affected. If it is more than 10% by weight, the Tg is excessively decreased, and the mechanical properties such as impact resistance are remarkably decreased, and there is a possibility that the problem of the inorganic filler protruding to the outer surface at the time of injection may be exacerbated.

The polycarbonate resin composition of the present invention may further contain various additives depending on the application within a range not hindering the object of the present invention.

Examples of the additives include antimicrobial agents, heat stabilizers, antioxidants, releasing agents, light stabilizers, surfactants, coupling agents, plasticizers, compatibilizers, lubricants, antistatic agents, colorants, pigments, dyes, flame retardants, Ultraviolet light absorber, ultraviolet light absorber, and mixtures thereof. The content of the additive can be easily determined by those skilled in the art.

The polycarbonate resin composition of the present invention can be prepared by a known method. For example, each component and additives are mixed with a Henschel mixer, a V blender, a tumbler blender, a ribbon blender, etc., and melt-extruded at a temperature of 150 to 300 ° C using a single screw extruder or a twin screw extruder to produce a pellet . At this time, the components other than the inorganic filler can be fed to the main feeder and the inorganic filler can be fed to the side feeder. More specifically, the extruded product was extruded at 250 to 280 DEG C under a condition of a screw rotating speed of 300 to 600 rpm and a self-feeding speed of 60 to 600 kg / hr using a twin-screw extruder with L / D = 29 and 45 mm, Can be prepared. The prepared pellets were dried at 100 ° C for 3 hours or more and then injected into the specimen.

According to another embodiment of the present invention, there is provided a molded article improved in appearance and fluidity, which is produced by molding the polycarbonate resin composition described above. That is, the polycarbonate resin composition can be used to produce a molded article by various processes such as injection molding, double injection molding, blow molding, extrusion molding, and thermoforming.

It is preferable that the molded article satisfies the following formulas (1) to (3).

50? Gloss? 90 [Formula 1]

80? Yp? 100 [Formula 2]

150 ≤ Spiral length ≤ 200 [Formula 3]

(Gloss in the above Equation 1 is a 60 degree gloss value measured by a gloss meter using a rectangular shaped injection mold having a size of 9 cm x 5 cm. In Equation 2, Yp is an injection amount of 10 cm x 10 cm x 1 cm (%), Which is determined by naked eye and determined by the number of good products except for defects, and the spiral length is 1 mm in thickness and 1 cm in width (Mm) when injection molded at 310 ° C using a spiral mold.

The molded article made of the polycarbonate resin composition of the present invention contains a polycarbonate resin, an inorganic filler, and a Tg regulator containing phosphorus, thereby improving fluidity and appearance characteristics after injection while maintaining excellent mechanical properties and molding processability, And the yield was remarkably improved.

1 is a photomicrograph of a molded article produced from a polycarbonate resin composition according to an embodiment of the present invention and photographing its appearance. Referring to FIG. 1, a phosphorus-containing Tg modifier is contained, The protrusion of the filler is remarkably reduced and the appearance characteristics are improved.

Therefore, it can be usefully used for the exterior materials of electronic devices such as mobile phones requiring such characteristics.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples.

The specifications of each component used in the following examples and comparative examples are as follows.

(A1) Polycarbonate resin

INFINO SC-1190 (Melt Index (300 ° C, 1.2 kg) = 20 g / 10 min, weight average molecular weight: 24,000 g / mol), which is a polycarbonate resin of Cheil Industries,

(A2) Polycarbonate resin

INFINO SC-1620 (Melt Index (300 DEG C, 1.2 kg) = 65 g / 10 min, weight average molecular weight 18,000 g / mol), a polycarbonate resin of Cheil Industries,

(B) inorganic filler

Glass fiber having an average length of 3 mm (Owens Corning 183F) was used.

(C1) phosphorus-containing Tg regulator

Cyclophosphazines (Rabite FP-110, Fushimi) were used.

(C2) phosphorus-containing Tg regulator

Hexachlorocyclophosphazine (Samreal 87, Ningbo Samreal Chemical) was used.

(D) a lubricant

HDPE wax type lubricant (HI-WAX 400P, MITSUI PETROCHEMICAL) was used.

(E) Antioxidant

Bis (2,4-dicumylphenyl) pentaerythritol diphosphite Doverphos S-9228 PC (DOVER CHEMICAL) was used as an antioxidant.

How to measure property

(One) Gloss measurement

The glossy 9 * 5 cm rectangular specimens were measured at an angle of 60 ° using a VG7000 gloss meter from nippon denshoku.

(2) Measurement of coating yield

The test specimens of 10cm × 10cm × 1cm in size were painted in three grades of under-middle-top, and then the test specimens were judged by visual inspection. And the coating yield (%) was measured by the number of good products except defective.

(3) Impact resistance measurement (dupont drop test)

A specimen with a thickness of 1 mm, a width of 5 cm and a length of 5 cm was injected and aged at room temperature for 6 hours or more. After that, more than 20 specimens were impacted using a drop test (500 g weight) The average height of the fracture is expressed in units of cm.

(4) Flexural modulus

ASTM D790 standard at a rate of 2.8 mm / min.

(5) Spiral length

The flow length of the resin was measured in mm using a spiral mold having a thickness of 1 mm and a width of 1 cm at injection molding while maintaining a constant pressure, speed and cushion amount at 310 ° C.

[Example 1-2]

(A) a polycarbonate resin, (C) a phosphorus-containing Tg modifier, (D) a lubricant and (E) an antioxidant were blended and dry blended to prepare a polycarbonate resin composition And then pelletized using a twin screw extruder having a diameter of 45 mm at a nozzle temperature of 250 to 280 ° C. At this time, the inorganic filler (B) was put into the side feeder. The prepared pellets were dried at 100 ° C for 3 hours and then injection-molded into specimens. Physical properties of the pellets were measured and are shown in Table 2 below.

[Example 3]

Except that (C1) Tg regulator and (C2) Tg regulator were mixed, as shown in the following Table 1, and they were injection-processed into specimens, and physical properties were measured and shown in Table 2 below .

[Comparative Example 1]

As shown in the following Table 1, except that the Tg regulator containing phosphorus (C) was not used, the same process as in Example 1 was carried out and injection-molded into specimens. Physical properties were measured and are shown in Table 2 below.

[Comparative Example 2]

As shown in the following Table 1, except that (D) the lubricant was used in an excessive amount, the same procedure as in Example 1 was carried out and injection-molded into specimens. Physical properties were measured and are shown in Table 2 below.

[Comparative Example 3]

Except that the polycarbonate resin (A2) having different molecular weights was used as shown in Table 1 below. The properties were measured and the results are shown in Table 2 below.

[Comparative Example 4-5]

As shown in the following Table 1, except that the content of the Tg regulator containing phosphorus (C) was deviated from the range of the present invention, the same procedure as in Example 1 was carried out and injection-processed into a specimen. Table 2 shows the results.

[Table 1]

[Table 2]

As shown in Table 2, by applying the phosphorus-containing Tg regulator from Examples 1 to 3 of the present invention, it was found that the gloss was much better than those of Comparative Examples 1 to 3, which were not applied. In addition, it was found that the impact resistance is also good and the mechanical properties required for the exterior material of the portable electronic device are retained.

In the case of Comparative Example 2 using a lubricant instead of the Tg regulator of the present invention, the flowability was good but the paint yield was remarkably reduced, and in Comparative Example 3 in which a low molecular weight polycarbonate resin was applied, the impact resistance was remarkably reduced .

Further, in Comparative Example 4, the Tg control agent was included in an excessively small amount so that it had little influence on fluidity improvement, and appearance and coating yield were decreased. In Comparative Example 5, the Tg control agent was excessively contained, It was found that the impact resistance was decreased and the coating yield was remarkably decreased due to the protrusion of the glass fiber at the time of injection.

Therefore, by applying the Tg regulator containing phosphorus in an optimum amount, the flow can be improved, and the protrusion of the inorganic filler can be prevented in advance at the time of injection so as to have a beautiful appearance characteristic, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

Claims (8)

(A) a polycarbonate resin composition comprising 50 to 85% by weight of a polycarbonate resin, (B) 10 to 40% by weight of an inorganic filler, and (C) 1 to 10%
The polycarbonate resin (A) is a polymer of an aromatic dihydroxy compound and a carbonate precursor,
(Molded product) formed from the polycarbonate resin composition satisfies the following formulas 1 to 3:
50? Gloss? 90 [Formula 1]
80? Yp? 100 [Formula 2]
150? Spiral length? 200 [Formula 3]
In the above Equation 1, Gloss is an average value of 60 ° gloss (gloss value) measured by using a glossmeter in a rectangular specimen of 9 cm x 5 cm in size, and Y p is a size of 10 cm x 10 cm x 1 cm (%) Measured by the number of good products except defective after judging by visually judging the unevenness of the product after coating 100 injected specimens, and in the formula 3, the spiral length is the thickness (Mm) measured by injection molding at 310 ° C using a spiral mold having a width of 1 mm and a width of 1 cm.
The polycarbonate resin composition according to claim 1, wherein the (A) polycarbonate resin has a weight average molecular weight (Mw) of 10,000 to 200,000 g / mol.
The polycarbonate resin composition according to claim 1, wherein the inorganic filler is at least one selected from the group consisting of glass fiber, carbon fiber, ceramic fiber, calcium carbonate, silica, alumina, aluminum hydroxide, talc, clay, mica, barium sulfate and whiskers.
The polycarbonate resin composition according to claim 1, wherein the Tg regulator containing (C) phosphorus is a compound having a structure represented by the following formula (1):
[Chemical Formula 1]

Wherein R ₁ to R ₆ are each independently selected from the group consisting of hydrogen, halogen, (C 1 -C 20) alkyl, (C 2 -C 7) alkenyl, (C 3 -C 20) cycloalkyl, (C 2 -C 20) heterocycloalkyl (C1-C10) alkoxy, (C6-C20) aryl, (C5-C20) heteroaryl, (C1- C10) alkoxycarbonyl Roxy,
(C 1 -C 10) alkyl, halogen, nitro, cyano, hydroxy, amino, (C 6 -C 10) aryl, (C 3 -C 10) alkyl, alkenyl, cycloalkyl, heterocycloalkyl, alkoxycarbonylalkyl, -C10) cycloalkyl, (C3-C10) heterocycloalkyl or (C4-C10) heteroaryl.
5. The polycarbonate resin composition according to claim 4, wherein the Tg regulator containing phosphorus (C) is at least one selected from the group consisting of compounds having the following structural formulas (2) to (4)
(2)

(3)

[Chemical Formula 4]

In Formula 4, R ₁₁ to R ₆₁ are each independently selected from hydrogen, methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl or benzyl.
The polycarbonate resin composition according to claim 1, wherein the polycarbonate resin composition is selected from the group consisting of antimicrobial agents, heat stabilizers, antioxidants, mold release agents, light stabilizers, surfactants, coupling agents, plasticizers, compatibilizers, lubricants, antistatic agents, colorants, pigments, An additive selected from the group consisting of an antioxidant, an antioxidant, an antioxidant, an antioxidant, an antioxidant, an antioxidant, an antioxidant, an antioxidant, an antioxidant,
A molded article produced from the polycarbonate resin composition according to any one of claims 1 to 6.
The molded article according to claim 7, wherein the molded article is a cellular phone casing.

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