KR20160061649A - Polycarbonate resin composition with improved compatibility having good scratch resistance and transparency and product thereof - Google Patents

Abstract

The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition to extend a use range of a transparent polycarbonate material with a high hardness, and a product using the same. A resin composition with an improved surface hardness and an excellent optical characteristic without a secondary process is suggested as a methacrylate based copolymer/polycarbonate resin composition to extend the use range of the transparent polycarbonate material with the high hardness, however a polycarbonate and methacrylate based copolymer resin has a problem causing a phase separation in a high temperature and high pressure condition due to a behavior difference. Thus, a transparent polycarbonate resin composition with the high hardness extends the processability of the polycarbonate resin composition and overcomes a limitation stated as above by using a specific additive. Further, a product using the same is disclosed. According to the present invention, the polycarbonate resin composition comprises: 50 to 90 wt% of a polycarbonate resin; 10 to 50 wt% of a methacrylate copolymer resin with a weight-average molecular weight of 2,000 to 3,000 g/mol; and 0.001 to 1 parts by weight of an amide based stabilizer with respect to 100 parts by weight of the total amount of the polycarbonate resin and the methacrylate copolymer resin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition having excellent scratch resistance and transparency with improved compatibility and a product using the polycarbonate resin composition. 2. The polycarbonate resin composition according to claim 1,

The present invention relates to a polycarbonate resin composition, and more particularly, to a polycarbonate resin composition for expanding the use range of a transparent polycarbonate material having a high hardness and a product using the polycarbonate resin composition.

Polycarbonate resin is excellent in impact resistance and mechanical properties, and exhibits high transparency, excellent dimensional stability, and broad coloring property. Recently, as a result of cost reduction, enlargement, and weight reduction of electric and electronic products, plastic products using polycarbonate resin The area of glass or metal material is rapidly replacing, and the range of use is expanded to electric and electronic products as well as automobile parts. As a result, functions and appearance performance as exterior materials have become more important than existing materials, and the performance of scratches caused by external impacts has been increasing.

In general, in order to improve the scratch resistance of plastics, a surface of a final molded resin is coated with an organic-inorganic hybrid material and subjected to chemical treatment such as UV curing or thermosetting, or physical treatment such as plasma assisted deposition . However, if such a secondary process is performed, the cost of the additional process increases, the process time becomes longer, and environmental pollution occurs due to the secondary treatment. Therefore, in recent years, there has been an increasing demand for unpainted resins that can exhibit scratch resistance without hard coating. When a polymer having high scratch resistance of plastic is blended and used, the polycarbonate inherent property There is a problem that the transparency is easily lost and the surface quality is poor.

To solve such a problem, a resin composition in which a polycarbonate resin and a methacrylic resin are mixed is disclosed. As described above, in the case of a polycarbonate resin having excellent physical properties, since the scratch resistance is not as good as the pencil hardness of 2B, the methacrylic resin having excellent scratch resistance with pencil hardness of 3H to 4H is mixed and used. However, Problems arise.

On the other hand, due to the recent development of flexible displays, it is expected to restrict the existing tempered glass for Windows of smartphones, tablet PCs, etc., and development of materials that can replace them is required.

US Patent Publication No. 2012-0121845 attempts to improve the surface hardness by applying silicon dioxide nanoparticles to a polycarbonate substrate. However, due to the secondary processing for coating, problems such as process cost, process time, and haze increase are high .

U.S. Patent No. 8,088,849 discloses a technique using an ether phosphoric acid compound and a halogen compound to maintain the surface hardness, flame retardancy, and transparency of a polycarbonate substrate. However, when a halogen compound is used, .

Korean Patent Laid-Open No. 2009-0039612 attempts to improve the scratch resistance by using a methacrylic copolymer resin composition, but it has a problem of high haze and low transparency.

As a methacrylic copolymer / polycarbonate resin composition, there has been proposed a resin composition having an improved surface hardness and excellent optical characteristics without additional secondary processing, in order to expand the range of use of a transparent polycarbonate material having a high hardness, but polycarbonate and methacrylic Based copolymer resin has a problem that phase separation occurs under processing conditions of high temperature and high pressure due to the difference in behavior, and in order to overcome this limitation, it is necessary to use a specific additive to increase the processability of the polycarbonate resin composition A polycarbonate resin composition and a product using the same.

In order to solve the above-described problems, the present invention provides a resin composition comprising 50 to 90% by weight of a polycarbonate resin; 10 to 50% by weight of a methacrylic copolymer resin having a weight average molecular weight of 2,000 to 3,000 g / mol; And 0.001 to 1 part by weight of an amide stabilizer based on 100 parts by weight of the total of the polycarbonate resin and the methacrylic copolymer resin.

The polycarbonate resin has a weight average molecular weight of 10,000 to 200,000.

Also, the methacrylic copolymer resin is a copolymer of 10 to 100% by weight of an aliphatic or aromatic methacrylate represented by the following formula (1) and 0 to 90% by weight of a monofunctional unsaturated monomer .

[Chemical Formula 1]

(Wherein m is an integer of 0 to 10, and X is a methyl group, a phenyl group, a cyclohexyl group, a methylphenyl group, a methylethylphenyl group, a propylphenyl group, a methoxyphenyl group, a cyclohexylphenyl group, a chlorophenyl group, Or a benzylphenyl group)

And the amide-based stabilizer is a compound represented by the following general formula (2).

(2)

(R (1) and R (2) are each independently an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, an alkyl group having 1 to 20 carbon atoms, m is an integer of 1 to 2, and when m is 1, X is an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, or an alkyl group having 1 to 20 carbon atoms, And when m is 2, X is an alkyl group having 1 to 10 carbon atoms, a non-aromatic ring system, or an aromatic ring system).

And the amide-based stabilizer is N, N'-ethylenedi (stearamide). The present invention also provides a polycarbonate resin composition, wherein the amide-based stabilizer is N, N'-ethylenedi (stearamide).

And the polycarbonate resin composition has a scratch resistance of not less than a pencil hardness H according to the ASTM evaluation method D3363 and a haze increase degree according to the ASTM evaluation method D1003 measured according to the following method is 10 times or less Lt; / RTI >

[Measurement method of increase in haze]

The nozzle temperature was fixed at 300 ° C using an injection machine and the haze value of the specimen injected at an injection pressure of 110 bar was measured in relation to the haze value of the molded specimen at an injection pressure of 50 bar.

In order to solve the above-mentioned problems, the present invention provides a product manufactured using the polycarbonate resin composition.

According to the present invention, a methacrylic copolymer resin having a relatively low weight average molecular weight relative to a polycarbonate resin is mixed in an optimal range and an amide-based stabilizer is added to improve the processability of the resin composition. , It is possible to improve moldability by improving fluidity and to improve the scratch resistance while maintaining the inherent transparency of polycarbonate and to expand the processing conditions in accordance with the use of the amide stabilizer, It is possible to produce a large-area product through high-pressure molding when applied, and it can improve process rate and energy saving by shortening process time.

In addition, due to the recent flexible display development, it is anticipated that the glass used for windows of smart phones, tablet PCs and the like will be constrained by the tempered glass that is being used, and thus it is possible to provide a material to replace them. In particular, It is possible to contribute to the production of a large-area molded product having excellent appearance that can be obtained by improving processing conditions through improvement of the properties.

Hereinafter, preferred embodiments of the present invention will be described in detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Throughout the specification, when an element is referred to as "including " an element, it means that it can include other elements, not excluding other elements, unless specifically stated otherwise.

The present inventors have found that the transparency of the resin composition is rather reduced due to the methacrylic copolymer resin mixed for improving the scratch resistance of the polycarbonate resin and the problem of the high temperature and the high temperature due to the difference in behavior of the polycarbonate and the methacrylic copolymer resin, As a result of intensive investigations on the problem of occurrence of phase separation under high-pressure processing conditions, it has been found that the addition of an optimal amount of a specific amide-based stabilizer improves the scratch resistance while maintaining the inherent transparency of the polycarbonate, Accordingly, it was found that the processing conditions could be expanded, and high-temperature and high-pressure molding could be carried out, leading to the present invention.

Accordingly, the present invention provides a resin composition comprising 50 to 90% by weight of a polycarbonate resin; 10 to 50% by weight of a methacrylic copolymer resin having a weight average molecular weight of 2,000 to 3,000 g / mol; And 0.001 to 1 part by weight of an amide stabilizer based on 100 parts by weight of the total of the polycarbonate resin and the methacrylic copolymer resin. First, components constituting the resin composition according to the present invention will be described in detail.

Polycarbonate resin

The polycarbonate (PC) resin used in the present invention is an amorphous polymer having excellent transparency, excellent impact resistance, self-extinguishing ability, flexibility and processability, excellent weather resistance, long-term high physical properties, excellent heat resistance and cold resistance, Performance can be maintained even with temperature changes.

The polycarbonate resin may be prepared by a conventional method, for example, by reacting a dihydroxy phenol compound with phosgene in the presence of a molecular weight modifier and a catalyst, or by reacting a dihydroxy phenol resin Can be prepared by using an ester interchange reaction of a compound and a precursor obtained by diphenyl carbonate.

Here, as the dihydroxyphenol compound, a bisphenol compound may be used, and bisphenol A (2,2-bis (4-hydroxyphenyl) propane) may be preferably used. At this time, the bisphenol A may be partially or wholly replaced with another kind of dihydroxy phenolic compound. (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis Bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl) sulfone, bis Bis (4-hydroxyphenyl) ether, 2,2, -bis (3,5-dibromo-4-hydroxyphenyl) propane and the like.

The polycarbonate resin may be a homopolymer of a dihydroxy phenolic compound, a copolymer of two or more dihydroxy phenolic compounds, or a mixture thereof.

The polycarbonate resin to be used in the polycarbonate resin composition for use in the present invention is not particularly limited as long as it is a polycarbonate resin having a specific structure such as a specific polycarbonate resin, a polycarbonate resin, a polycarbonate resin, But the linear polycarbonate resin, the branched polycarbonate resin, or the polyester carbonate copolymer resin and the like can be used. Of these, a bisphenol A polycarbonate resin can be used as the linear polycarbonate resin. Examples of the branched polycarbonate resin include a polyfunctional aromatic compound such as trimellitic anhydride or trimellitic acid, A phenol compound and a carbonate precursor may be used. As the polyester carbonate copolymer resin, for example, those prepared by reacting a difunctional carboxylic acid with a dihydroxy phenol and a carbonate precursor may be used. In addition, the polycarbonate resin may be branched, and preferably 0.05 to 2 mol%, based on the total amount of diphenols used in the polymerization, of tri- or more polyfunctional compounds such as trivalent or higher phenol groups Compounds prepared by adding a compound can be used.

In the present invention, the polycarbonate resin is contained in an amount of 50 to 90% by weight, preferably 60 to 80% by weight. If the content of the polycarbonate resin is less than 50% by weight, excellent mechanical properties of the polycarbonate may not be exhibited. If the content of the polycarbonate resin exceeds 90% by weight, improvement in scratch resistance may not be expected.

In the present invention, the polycarbonate resin may have a weight average molecular weight of 10,000 to 200,000, preferably 15,000 to 80,000, and more preferably 20,000 to 50,000.

Methacrylic system  Copolymer resin

The methacrylic copolymer resin used in the present invention has a weight average molecular weight of 2,000 to 3,000 g / mol, excellent compatibility with the polycarbonate resin in the weight-average molecular weight range, A polycarbonate resin composition having extremely excellent characteristics in view of fogging can be obtained. Also, when a methacrylic copolymer resin having a high refractive index of 1.52 to 1.58 is used, high transparency of 0.8% or less, which is equivalent to that of polycarbonate, can be maintained in the blended molded article with the polycarbonate resin. Here, the methacrylic copolymer resin having a high refractive index is a resin modified with an aromatic or aliphatic methacrylate, and can be polymerized by conventional bulk, emulsion and suspension polymerization methods.

In the present invention, the methacrylic copolymer resin may be a copolymer of 10 to 100% by weight of aromatic or aliphatic methacrylate and 0 to 90% by weight of monofunctional unsaturated monomer. When the aromatic or aliphatic methacrylate is less than 10% by weight, the average refractive index of the polymerized methacrylic copolymer resin may be less than 1.52. The methacrylic copolymer may be represented by the following general formula (1).

[Chemical Formula 1]

(Wherein m is an integer of 0 to 10, and X is a methyl group, a phenyl group, a cyclohexyl group, a methylphenyl group, a methylethylphenyl group, a propylphenyl group, a methoxyphenyl group, a cyclohexylphenyl group, a chlorophenyl group, Or a benzylphenyl group)

The aromatic or aliphatic methacrylate includes, for example, cyclohexyl methacrylate, 2-ethylphenoxy methacrylate, 2-ethylthiophenyl methacrylate, phenyl methacrylate, 2-methylphenyl ethyl methacrylate, 2,4-methylphenyl ethyl methacrylate, 2-methylphenyl ethyl methacrylate, 2-methylphenyl ethyl methacrylate, 2- (4-methylphenyl) ethyl methacrylate, 2- (4-methoxyphenyl) ethyl methacrylate, 2- 2- (4-chlorophenyl) ethyl methacrylate, 2- (2-chlorophenyl) ethyl methacrylate, 2- Ethyl methacrylate, 2- (3-phenylphenyl) ethyl methacrylate, 2- (4-benzylphenyl) ethyl methacrylate And the like.

Examples of the monofunctional unsaturated monomer include methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, benzyl methacrylate and the like, acrylates such as methyl acrylate, Unsaturated carboxylic acids such as acrylic acid and methacrylic acid, acid anhydrides such as maleic anhydride and the like, acid anhydrides such as 2-hydroxyethylacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl acrylate, Acrylate, hydroxypropyl acrylate, monoglycerol acrylate, and the like, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, allyl glycidyl ether, glycidyl methacrylate, styrene, And the like.

In the present invention, the methacrylic copolymer resin is contained in an amount of 10 to 50% by weight, preferably 20 to 40% by weight. If the content of the methacrylic copolymer resin is less than 10% by weight, improvement in scratch resistance may not be expected. If it exceeds 50% by weight, a flow mark may be formed during molding.

Amide series Stabilizer

The amide stabilizer in the present invention is to solve the phase separation problem caused by the difference in behavior of the polycarbonate and the methacrylic copolymer resin when the polycarbonate resin composition is used under high temperature and high pressure conditions. Is used.

(2)

(R (1) and R (2) are each independently an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, an alkyl group having 1 to 20 carbon atoms, m is an integer of 1 to 2, and when m is 1, X is an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, or an alkyl group having 1 to 20 carbon atoms, And when m is 2, X is an alkyl group having 1 to 10 carbon atoms, a non-aromatic ring system, or an aromatic ring system).

In the present invention, as the amide stabilizer, the polycarbonate resin and the methacrylic copolymer resin are preferably mixed with N, N'-ethylenedi (stearamide) (stearamide), which is particularly suitable for phase separation, stearamide)) can be preferably used.

The amide stabilizer is added in an amount of 0.001 to 1 part by weight, preferably 0.05 to 0.8 part by weight, more preferably 0.1 to 0.5 part by weight, most preferably 0.1 to 5 parts by weight, per 100 parts by weight of the total of the polycarbonate resin and the methacrylic copolymer resin May be included in an amount of 0.2 to 0.4 parts by weight. When the amount of the amide stabilizer is less than 0.001 part by weight, it may be difficult to improve the compatibility. If the amount is more than 1 part by weight, the haze may increase and the physical properties may be deteriorated.

The resin composition according to the present invention may further contain another additive depending on the purpose of use within the scope of the present invention. Examples of the additional additives include epoxy compounds, heat stabilizers, antioxidants, flame retardants, surfactants, nucleating agents, coupling agents, impact modifiers, release agents, inorganic additives, ultraviolet stabilizers, dyes, pigments, compatibilizers, colorants, lubricants, They may be added alone or in a mixture of two or more in a generally used range.

The epoxy compound is used for improving the hydrolysis resistance of the resin composition. Examples of the epoxy compound include epoxidized soybean oil, epoxidized linseed oil, phenylglycidyl ether, allyl glycidyl ether, t-butylphenyl glycidyl ether, Epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3', 4'-epoxy-6'-methylcyclohexylcarboxylate , 2,3-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexylcarboxylate, 4- (3,4-epoxy-5-methylcyclohexyl) butyl-3', 4'-epoxycyclohexylcarb Cyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexylcarboxylate , Bisphenol A diglycidyl ether, tetrabromobisphenol A glycidyl ether, diglycidyl ester of phthalic acid , Diglycidyl esters of hexahydrophthalic acid, bis-epoxy dicyclopentadienyl ether, bis-epoxy ethylene glycol, bis-epoxycyclohexyl adipate, butatadienedepoxide, tetraphenylethylene epoxide, octyl Epoxidized polybutadiene, 3,4-dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3-methyl- -Epoxycyclohexane, octadecyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, cyclohexyl- -Methyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2-isopropyl-3,4-epoxy-5-methylcyclohexylcarboxylate, octadecyl-3,4-epoxycyclohexylcarboxyl Ethylhexyl-3 ', 4'-epoxycyclohexylcarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3', 4'-epoxycyclohexylcarboxylate 3-t-butyl-4,5-epoxy anhydride tetrahydrophthalic acid, diethyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate Di-N-butyl-3-t-butyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate and the like, and bisphenol A diglycidyl ether . The epoxy compound is preferably contained in an amount of 0.0001 to 5 parts by weight, more preferably 0.001 to 1 part by weight, and most preferably 0.005 to 0.5 part by weight based on 100 parts by weight of the resin composition Even more preferred. By adding an epoxy compound in the above content range, it is possible to improve the hydrolysis resistance of the molded article without causing deterioration of the mechanical properties of various molded articles while preventing bleeding of the epoxy compound on the surface of the molded article.

The heat stabilizer is used to prevent the deterioration of the molecular weight and the deterioration of the color during molding using the resin composition of the present invention. Examples thereof include phosphorous acid, phosphoric acid, phosphonic acid, phosphonic acid and their esters. , Triphenylphosphite, tris (nonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tridecylphosphite, trioctylphosphite, trioctadecylphosphite, Diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, mono octyl diphenyl phosphite, bis (2,6-di-tert-butyl (2,4-di-tert-butylphenyl) octylphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis (2,4- Di-tert-butylphenyl) pentaerythritol Tetrabutyl phosphate, triethyl phosphate, trimethyl phosphate, triphenyl phosphate, diphenylmonoctalkenyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate, 4 , 4'-biphenylene diphosphinic acid tetrakis (2,4-di-tert-butylphenyl), dimethyl benzenephosphonate, diethyl benzenephosphonate and dipropyl benzenephosphonate. Among them, trisnonylphenyl phosphite, trimethyl phosphate, tris (2,4-di-tert-butylphenyl) phosphite, bis (2,4-di-tert- butylphenyl) pentaerythritol diphosphite, bis 2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, and dimethyl benzenephosphonate. The heat stabilizer is preferably contained in an amount of 0.0001 to 1 part by weight, more preferably 0.0005 to 0.5 part by weight, and more preferably 0.001 to 0.2 part by weight based on 100 parts by weight of the resin composition. desirable. By adding the heat stabilizer in the above content range, the molecular weight of the resin and discoloration of the resin can be prevented without causing bleeding of the additive.

As the antioxidant, those conventionally known for the purpose of preventing the oxidation of the resin composition may be used. Examples of such antioxidants include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-laurylthiopropionate), glycerol-3-stearylthiopropionate, tri Bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3-hydroxyphenyl) propionate, pentaerythritol tetrakis Butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert- ) Benzene, N, N-hexamethylenebis (3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5-di-tert- Diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 4,4'- (2,4-di-tert-butylphenyl) phenylene diphosphosphinate, 3,9-bis {1,1-dimethyl- -Methylphenyl) propionyloxy] ethyl} -2,4,8,10-tetraoxaspiro (5,5) undecane and the like can be used. The antioxidant is preferably contained in an amount of 0.0001 to 1 part by weight, more preferably 0.0005 to 0.5 part by weight, and most preferably 0.001 to 0.2 part by weight based on 100 parts by weight of the resin composition. desirable. By adding the antioxidant in the above content range, bleeding of the antioxidant on the surface of the molded article can be prevented, deterioration of the oxidation of the resin can be prevented without causing deterioration of the mechanical properties of various molded articles.

The resin composition according to the present invention may further comprise a resin other than the polycarbonate resin. Specific examples of the resin other than the polycarbonate resin blended for the purpose of further improving and adjusting the molding processability and various physical properties include resin such as polyester resin, polyether, polyamide, polyolefin, polymethyl methacrylate Core-shell type, graft-type or linear random and block copolymer. The resin other than the polycarbonate resin is preferably contained in an amount of 1 to 30 parts by weight, more preferably 3 to 20 parts by weight, and more preferably 5 to 10 parts by weight, based on 100 parts by weight of the resin composition according to the present invention. It is more preferable that it is included as the minor content.

The resin composition according to the present invention can be prepared by a known method. For example, polycarbonate resins, methacrylic copolymer resins and amide stabilizers, and then melt extruded in an extruder to produce pellets. The pellets are used for various plastic injection and extrusion molding Can be manufactured. The melt extrusion may be carried out at a screw rotation speed of 50 to 1,000 rpm at a retention time of 5 to 90 seconds, preferably at a screw rotation speed of 200 to 800 rpm for a retention time of 10 to 60 seconds. The residence time is preferably 90 seconds or less in order to prevent deterioration of the methacrylic copolymer resin and to improve productivity.

The polycarbonate resin composition prepared according to the present invention has a scratch resistance of not less than pencil hardness H, fixing the nozzle temperature at 300 캜 by using an injection machine, and controlling the injection pressure at an injection pressure of 110 bar The degree of increase in the haze value of the specimen ejected from the test specimen is 10 times or less, preferably 5 times or less, more preferably 2 times or less, and still more preferably 0.5 times or less.

Hereinafter, a specific embodiment of the present invention will be described.

Example  One

, 30 parts by weight of a methacrylic copolymer resin (H-880, Mitsubishi Rayon) having a refractive index of 1.54 to 1.56 and a weight average molecular weight of 2,500, 70 parts by weight of a polycarbonate resin (bisphenol A type, weight average molecular weight 25,000) (Stearamide) were mixed in an amount of 0.05 part by weight and extruded at an extrusion temperature of 270 to 300 ° C. and a screw rotation speed of 200 rpm using a twin screw extruder (screw diameter 26 mm, L / D = 40) To prepare a pellet-shaped polycarbonate resin composition.

Example  2

A polycarbonate resin composition in the form of a pellet was prepared in the same manner as in Example 1, except that 0.1 part by weight of N, N'-ethylenedie (stearamide) was mixed in Example 1.

Example  3

A polycarbonate resin composition in the form of a pellet was prepared in the same manner as in Example 1, except that 0.3 parts by weight of N, N'-ethylenedie (stearamide) was mixed in Example 1.

Comparative Example  One

A polycarbonate resin composition in the form of pellets was prepared in the same manner as in Example 1 except that the methacrylic copolymer resin and the amide stabilizer were not mixed in Example 1 with 100 parts by weight of the polycarbonate resin.

Comparative Example  2

A polycarbonate resin composition in the form of pellets was prepared in the same manner as in Example 1, except that the amide stabilizer was not mixed in Example 1.

The composition (unit: parts by weight) of the resin composition prepared according to the above Examples and Comparative Examples is shown in Table 1 below.

Test Example

In order to evaluate the scratch resistance and processability of the resin composition according to the present invention, the resin composition prepared according to the above Examples and Comparative Examples was fixed to a nozzle temperature of 300 캜 using an injection machine (170MT, Woojin Serex) (ASTM evaluation method D3363) and haze (ASTM evaluation method D1003) were measured by molding a specimen of 50 x 90 x 3 mm (width x length x height) while varying the pressure, and the results are shown in Table 2 below.

Referring to Table 2, the specimen prepared in the composition range according to the present invention exhibits excellent scratch resistance and transparency, and haze due to phase separation, which is caused by an increase in injection pressure, is reduced, When the stabilizer is included (Example 3), it can be seen that there is hardly any increase in haze due to an increase in injection pressure without deterioration of scratch resistance.

On the other hand, in the case of the test piece made only of the pure polycarbonate resin not using the methacrylic copolymer resin and the amide stabilizer (Comparative Example 1), the scratch resistance was not good, and in order to improve scratch resistance, the methacrylic It can be seen that even when the copolymer resin is used, the haze is remarkably increased with the increase of the injection pressure in the case where the amide stabilizer is not used (Comparative Example 2).

The preferred embodiments of the present invention have been described in detail above. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

Claims (7)

50 to 90% by weight of a polycarbonate resin;
10 to 50% by weight of a methacrylic copolymer resin having a weight average molecular weight of 2,000 to 3,000 g / mol; And
0.001 to 1 part by weight of an amide stabilizer based on 100 parts by weight of the total of the polycarbonate resin and the methacrylic copolymer resin;
≪ / RTI > The method according to claim 1,
Wherein the polycarbonate resin has a weight average molecular weight of 10,000 to 200,000. The method according to claim 1,
Wherein the methacrylic copolymer resin is a copolymer of 10 to 100% by weight of an aliphatic or aromatic methacrylate represented by the following formula (1) and 0 to 90% by weight of a monofunctional unsaturated monomer.
[Chemical Formula 1]

(Wherein m is an integer of 0 to 10, and X is a methyl group, a phenyl group, a cyclohexyl group, a methylphenyl group, a methylethylphenyl group, a propylphenyl group, a methoxyphenyl group, a cyclohexylphenyl group, a chlorophenyl group, Or a benzylphenyl group) The method according to claim 1,
Wherein the amide-based stabilizer is a compound represented by the following formula (2).
(2)

(R (1) and R (2) are each independently an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, an alkyl group having 1 to 20 carbon atoms, m is an integer of 1 to 2, and when m is 1, X is an unsubstituted or substituted carboxyl or heterocyclic aromatic ring system, hydroxy substituted phenylene or naphthalene, or an alkyl group having 1 to 20 carbon atoms, And when m is 2, X is an alkyl group having 1 to 10 carbon atoms, a non-aromatic ring system, or an aromatic ring system). The method according to claim 1,
Wherein the amide-based stabilizer is N, N'-ethylenededi (stearamide) (N, N'-ethylenedi (stearamide)). The method according to claim 1,
Wherein the polycarbonate resin composition has a scratch resistance of not less than a pencil hardness H according to the ASTM evaluation method D3363 and a haze increase degree according to the ASTM evaluation method D1003 measured by the following method is 10 times or less .
[Measurement method of increase in haze]
The nozzle temperature was fixed at 300 ° C using an injection machine and the haze value of the specimen injected at an injection pressure of 110 bar was measured in relation to the haze value of the molded specimen at an injection pressure of 50 bar. An article produced using the polycarbonate resin composition of any one of claims 1 to 6.