KR20190038521A - Thermoplastic resin composition and resin article using the same - Google Patents

Abstract

The present invention relates to a thermoplastic resin composition, which comprises: 100 parts by weight of a base resin comprising 14 to 25 wt% of a (meth)acrylate-aromatic vinyl-cyanide vinyl-based copolymer (A) and 75 to 86 wt% of a (meth)acrylate resin (B); and 25 to 35 parts by weight of an antistatic resin comprising at least one among a polyetheresteramide block copolymer (C), polyalkylene glycol, and polyamide, based on 100 parts by weight of the base resin. The present invention can provide the thermoplastic resin composition excellent in transparency, antistatic properties, impact resistance, and antimicrobial properties.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermoplastic resin composition,

The present invention relates to a thermoplastic resin composition. More specifically, the present invention relates to a thermoplastic resin composition excellent in transparency, antistatic property, impact resistance and antibacterial property.

The thermoplastic resin is excellent in mechanical properties, processability and appearance characteristics, and is widely used for interior / exterior materials for electric / electronic products, automotive interior / exterior materials, and exterior materials for construction.

Meanwhile, applications of transparent and translucent materials are expanding in recent years in the fields of consumer products, medical devices, and toys. As the degree of design increases, demands for high impact and high flow characteristics are increasing.

In the past, it has been known to use a shock-absorbing agent such as a silicone compound for reinforcing the impact resistance of a thermoplastic resin. However, when the impact assistant is included, the flowability of the thermoplastic resin composition may be lowered, or whitening may occur on the surface of the product at a low temperature.

Further, the thermoplastic resin containing an excessive amount of the impact aid has a problem that scratches tend to occur, the haze characteristic is high, and the total light transmittance is low, so that it is difficult to apply the product to a product which requires a transparent appearance.

As a result, the demand for a thermoplastic resin composition that can be applied to various products such as household appliances, automatic office appliances, medical devices, and toys has increased due to its excellent surface resistance and antibacterial properties while simultaneously increasing transparency and impact resistance .

A related prior art document is Korean Patent Laid-Open Publication No. 10-2012-0042802.

It is an object of the present invention to provide a thermoplastic resin composition excellent in transparency, antistatic property, impact resistance and antimicrobial property, and a resin molded article produced therefrom.

One embodiment of the present invention comprises (A) from 14% to 25% by weight of a (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and from 75% to 86% by weight of a (meth) acrylate resin 100 parts by weight of a base resin; And 25 to 35 parts by weight of a propylene resin containing at least one of (C) a polyetheresteramide block copolymer, a polyalkylene glycol and a polyamide, based on 100 parts by weight of the base resin, ≪ / RTI >

The weight ratio of the (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and the (B) (meth) acrylate resin in the base resin may be from 1: 3 to 1: 6.

The (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer is obtained by copolymerizing 20% by weight to 40% by weight of an aromatic vinyl monomer and a vinyl cyanide monomer; And 60% to 80% by weight of a (meth) acrylate monomer.

The (C) tailoring resin may contain a polyether ester amide block copolymer.

The polyetheresteramide block copolymer may contain 10 to 95% by weight of a polyether-ester block.

The base resin may have a refractive index of 1.25 to 1.75.

In the thermoplastic resin composition, the refractive index difference between the base resin represented by the following formula (1) and the preparation resin may be 0.3 or less.

[Formula 1]

Refractive index difference = | (R1 - R2) |

In the above formula (1), R1 is the refractive index of the base resin, and R2 is the refractive index of the resin for defoaming.

The thermoplastic resin composition was prepared by inoculating Staphylococcus and Escherichia coli into a 5 cm x 5 cm size specimen in accordance with JIS Z 2801 Antibacterial Evaluation Method and measuring the antimicrobial activity value for staphylococci calculated according to the following formula 2 to 2.0 to 7.0, May have an antibacterial activity value of 1.0 to 7.5.

[Formula 2]

Antibacterial activity = log (M1 / M2)

In the formula (2), M1 is the number of bacteria after culturing the blank specimen at 35 ° C and RH 90% for 24 hours, M2 is the specimen after incubation for 24 hours at 35 ° C and RH 90% It is the number of bacteria.

The thermoplastic resin composition may have a haze of 10% or less and a total light transmittance of 80% or more as measured by ASTM D1003 for a specimen having a thickness of 2.5 mm.

The thermoplastic resin composition may have a surface resistance of 10 10 ⁸ Ω / □ or less measured at 23 ° C. and 50% RH according to ASTM D 250 for a specimen having a thickness of 2.5 mm.

The thermoplastic resin composition may satisfy the following formula (3).

[Formula 3]

1000 mm ≤ Id

In Equation 3, Id is a drop height measured by a Du Pont drop test method using a metal weight of 1 kg for a specimen ejected at a thickness of 2 mm.

Another embodiment of the present invention relates to a molded article formed from the above-mentioned thermoplastic resin composition.

The present invention has the effect of providing a thermoplastic resin composition excellent in transparency, antistatic property, impact resistance and antimicrobial property and a resin molded article produced therefrom.

One embodiment of the present invention comprises (A) from 14% to 25% by weight of a (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and from 75% to 86% by weight of a (meth) acrylate resin 100 parts by weight of a base resin; And 25 to 35 parts by weight of a propylene resin containing at least one of (C) a polyetheresteramide block copolymer, a polyalkylene glycol and a polyamide, based on 100 parts by weight of the base resin, ≪ / RTI >

Accordingly, the present invention can provide a thermoplastic resin composition excellent in transparency, antistatic property, impact resistance and antibacterial property. The thermoplastic resin composition is particularly well-balanced in both transparency, antistatic property, impact resistance and antibacterial property, and can be more industrially useful when it is applied to applications such as household appliances such as household appliances, automatic office equipment, and toys .

(A) a (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer

The (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer according to one embodiment of the present invention is obtained by copolymerizing a vinyl cyanide monomer, an aromatic vinyl monomer and a monomer containing (meth) acrylate, Thermal stability and compatibility, and realizes transparency and impact resistance.

However, the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer may be a non-rubber copolymer containing no rubber polymer.

In an embodiment, the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer is obtained by subjecting a monomer mixture comprising a vinyl cyanide monomer, an aromatic vinyl monomer and (meth) acrylate to a usual polymerization process ≪ / RTI >

The initiator may be a radical polymerization initiator, but is not limited thereto. Examples of the initiator include, but are not limited to, peroxides, persulfates, cyanoated azo compounds, redox initiators, and the like. The polymerization of the copolymer may be carried out by a known polymerization method such as emulsion polymerization, suspension polymerization and bulk polymerization.

In an embodiment, the vinyl cyanide monomer may include at least one of acrylonitrile, methacrylonitrile, ethacrylonitrile, phenyl acrylonitrile,? -Chloroacrylonitrile, and fumaronitrile, It is not limited. These may be used alone or in combination of two or more.

In an embodiment, the content of the vinyl cyanide monomer is 1 wt% to 50 wt%, for example, 5 wt% to 45 wt% of the weight of the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer %, Specifically 10% to 30% by weight. Within the above range, the thermoplastic resin composition may be excellent in fluidity, impact resistance, appearance, and the like.

In an embodiment, the aromatic vinyl-based monomer is selected from the group consisting of styrene,? -Methylstyrene,? -Methylstyrene, p-methylstyrene, pt-butylstyrene, ethylstyrene, vinylxylene, monochlorostyrene, dichlorostyrene, di Bromostyrene, vinylnaphthalene, and the like can be used, but the present invention is not limited thereto. These may be used alone or in combination of two or more.

In an embodiment, the content of the aromatic vinyl monomer is 1 wt% to 50 wt%, for example, 5 wt% to 45 wt% of the weight of the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer %, Specifically 10% to 30% by weight. The heat resistance and impact resistance of the thermoplastic resin composition can be further improved in the above range.

In the specific examples, the (meth) acrylate monomers may be substituted or unsubstituted acrylic acid, methacrylic acid, and alkyl esters thereof, and they may be used alone or in combination of two or more.

(Meth) acrylate is a substituted or unsubstituted linear or branched alkyl (meth) acrylate having 1 to 20 carbon atoms, such as methyl (meth) acrylate (Meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, pentyl (Meth) acrylate, octyl (meth) acrylate, (meth) acrylate, decyl (meth) acrylate, and esters thereof. These may be used alone or in combination of two or more.

In an embodiment, the content of the (meth) acrylate monomer is from 10% by weight to 90% by weight, for example from 40% by weight to 100% by weight, based on the weight of the (meth) acrylate-aromatic vinyl- 80% by weight, specifically 60% by weight to 80% by weight. In the above range, the impact resistance, fluidity, appearance and the like of the thermoplastic resin composition may be more excellent.

In an embodiment, the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer (A) comprises 20% by weight to 40% by weight of an aromatic vinyl monomer and a vinyl cyanide monomer; And 60% to 80% by weight of a (meth) acrylate monomer. In the above range, the impact resistance, fluidity, appearance and the like of the thermoplastic resin composition may be more excellent.

In an embodiment, the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer has a weight average molecular weight of 30,000 g / mol to 200,000 g / mol, specifically 35,000 g / mol to 150,000 g / mol, 40,000 g / mol to 110,000 g / mol. In the above range, the thermoplastic resin composition may have better heat stability, heat resistance and fluidity.

The (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer is contained in an amount of 14 wt% to 25 wt% of 100 wt% of the base resin. When the content of the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer is less than 14% by weight, it is difficult to realize thermal stability and impact resistance. When the content exceeds 25% by weight, Prevention characteristics may not be sufficient.

In an embodiment, the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer may comprise from 14 wt% to 20 wt%, and from 15 wt% to 19 wt%. Within the above range, the impact resistance, transparency, antistatic property and the like of the thermoplastic resin composition can be further improved.

(B) a (meth) acrylate resin

The (meth) acrylate resin according to one embodiment of the present invention is a polymer of a (meth) acrylate monomer, wherein at least two homopolymers of (meth) acrylate monomers or two or more (meth) A copolymer containing a polymerized unit may be used. As a result, not only excellent transparency is imparted to the thermoplastic resin but also physical properties such as impact resistance can be improved.

In an embodiment, the (meth) acrylate monomer is selected from the group consisting of unsubstituted linear or branched alkyl (meth) acrylates having 1 to 20 carbon atoms such as methyl (meth) acrylate, ethyl (Meth) acrylate, ethyl (meth) acrylate, octyl (meth) acrylate, butyl (meth) acrylate, But are not limited to, one or more of (meth) acrylate, (meth) acrylate, decyl (meth) acrylate and esters thereof. These may be used alone or in combination of two or more.

In an embodiment, the (meth) acrylate monomer may be methyl methacrylate, methyl acrylate, or the like. In such a case, it is advantageous to control the refractive index while enhancing the transparency and impact resistance of the base resin by acting in combination with the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer described above.

The (meth) acrylate resin is contained in 75 wt% to 86 wt% of 100 wt% of the base resin. When the content of the (meth) acrylate resin is less than 75% by weight, the haze is high and the total light transmittance is low and transparent appearance characteristics are difficult to realize. When the content is more than 86% by weight, the surface resistance is high and the antistatic property is insufficient It is difficult to realize impact resistance.

In an embodiment, the (meth) acrylate resin may be included in the base resin in an amount of 78 wt% to 85 wt%, and 80 wt% to 85 wt%. Within the above range, the impact resistance, transparency, antistatic property and the like of the thermoplastic resin composition can be further improved.

(C) Resin resin

The resin for defoaming according to one embodiment of the present invention can improve the antimicrobial properties, antistatic properties and the like of the thermoplastic resin composition (or the specimen produced therefrom), and it is possible to use a polyetheresteramide block copolymer, a polyalkylene glycol, At least one of polyamides.

In an embodiment, the (C) proprietary resin may contain a polyether ester amide block copolymer. In this case, the antimicrobial property and antistatic property of the thermoplastic resin composition can be further improved, and compatibility with the above-mentioned base resin can be improved. The polyetheresteramide block copolymer may be a copolymer comprising a polyamide block, a polyether block, and an ester unit.

In an embodiment, the polyether ester amide block copolymer may be a polyether ester amide having a bisphenol skeleton such as bisphenol A. For example, polyamide and polyethylene oxide having a carboxyl group at both ends may be mixed with bisphenol A glycidyl A polyether ester amide formed by bonding with an ether can be used.

In an embodiment, the polyether ester amide block copolymer comprises an aminocarboxylic acid having 6 or more carbon atoms, a lactam or a diamine-dicarboxylic acid salt; Polyalkylene glycols; And a dicarboxylic acid having 4 to 20 carbon atoms.

Examples of the salt of an aminocarboxylic acid, a lactam or a diamine-dicarboxylic acid having 6 or more carbon atoms include ω-aminocaproic acid, ω-aminoenantic acid, ω-aminocaprylic acid, Aminocarboxylic acids such as aminocapric acid, 1,1-aminoundecanoic acid, 1,2-aminododecanoic acid and the like; Lactams such as caprolactam, enanthrolactam, capryllactam, lauryllactam and the like; And salts of diamines and dicarboxylic acids such as salts of hexamethylenediamine-adipic acid, salts of hexamethylenediamine-isophthalic acid, and the like. For example, 1,2-aminododecanoic acid, caprolactam, salts of hexamethylenediamine-adipic acid, and the like can be used.

The polyalkylene glycols can be selected from the group consisting of polyethylene glycol, poly (1,2- and 1,3-propylene glycol), polytetramethylene glycol, polyhexamethylene glycol, block or random copolymer of ethylene glycol and propylene glycol, And copolymers of hydrofluorocyclohexane and hydrofuran. For example, polyethylene glycol, a copolymer of ethylene glycol and propylene glycol, and the like can be used.

Examples of the dicarboxylic acid having 4 to 20 carbon atoms include terephthalic acid, 1,4-cyclohexarboxylic acid, sebacic acid, adipic acid, and dodecanecarboxylic acid.

In an embodiment, the bond between the above-mentioned aminocarboxylic acid, lactam or diamine-dicarboxylic acid having 6 or more carbon atoms and the polyalkylene glycol may be an ester bond, and the aminocarboxylic acid, lactam or The bond between the diamine-dicarboxylic acid salt and the dicarboxylic acid having 4 to 20 carbon atoms may be an amide bond, and the bond between the polyalkylene glycol and the dicarboxylic acid having 4 to 20 carbon atoms may be an ester Lt; / RTI >

In an embodiment, the polyetheresteramide block copolymer comprises 10 to 95 wt%, specifically 15 to 90 wt%, more specifically 20 to 85 wt%, of a polyether-ester block . Within the above range, the thermoplastic resin composition may have better mechanical properties, antimicrobial properties, antistatic properties, and the like.

In a specific example, the resisting resin is contained in an amount of 25 to 35 parts by weight based on 100 parts by weight of the base resin. If less than 25 parts by weight of the charge controlling resin is used, the antimicrobial properties and antistatic properties of the thermoplastic resin composition may be deteriorated. If the amount exceeds 35 parts by weight, the impact resistance of the thermoplastic resin composition is not sufficiently exhibited, , The total light transmittance is lowered, and the appearance characteristics and the like may be lowered.

In an embodiment, the charge control resin may include 27 to 33 parts by weight and 28 to 32 parts by weight based on 100 parts by weight of the base resin. Within the above range, the impact resistance, transparency, antistatic property and the like of the thermoplastic resin composition can be further improved.

(D) Additive

The thermoplastic resin composition according to one embodiment of the present invention may further include an additive contained in a conventional thermoplastic resin composition. Examples of the additives include, but are not limited to, flame retardants, fillers, antioxidants, anti-drop agents, lubricants, mold release agents, nucleating agents, stabilizers, pigments, dyes, and mixtures thereof. When the additive is used, the content thereof may be 0.001 to 40 parts by weight, for example, 0.1 to 10 parts by weight based on 100 parts by weight of the thermoplastic resin.

In the thermoplastic resin composition of the present invention, the weight ratio of the (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and the (B) (meth) acrylate resin in the base resin is 1: 3 to 1: 6, May be from 1: 3 to 1: 5. Within the above range, the balance of transparency, antistatic property, impact resistance and antimicrobial property of the thermoplastic resin composition can be further excellent.

The thermoplastic resin composition of the present invention reduces the difference in refractive index between the base resin and the resin for compensation by the action of the (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and the (B) Thereby lowering the haze and further improving the total light transmittance, thereby realizing better appearance characteristics.

The base resin may have a refractive index of 1.25 to 1.75, specifically 1.45 to 1.55. Within this range, it is possible to realize excellent optical characteristics with high transparency, high total light transmittance and low haze.

The thermoplastic resin composition of the present invention may have a refractive index difference of not more than 0.3, specifically not more than 0.2, more specifically not more than 0.15, between the base resin and the preparation resin represented by the following formula 1.

[Formula 1]

Refractive index difference = | (R1 - R2) |

In the above formula (1), R1 is the refractive index of the base resin, and R2 is the refractive index of the resin for defoaming. In this case, the transparency of the thermoplastic resin is further improved, and the effect of reducing the haze and coloring property can be more excellent in the case of containing a high-content resin for defoaming.

The thermoplastic resin composition of the present invention may be in the form of a pellet or a powder obtained by melt-extruding the above-mentioned components at a temperature of 200 ° C to 280 ° C, for example 220 ° C to 250 ° C, using a conventional twin-screw extruder.

The thermoplastic resin composition of the present invention has an antibacterial effect against various bacteria including Staphylococci, Escherichia coli and the like.

In a specific example, the thermoplastic resin composition is prepared by inoculating Staphylococcus aureus and Escherichia coli to a 5 cm x 5 cm size specimen according to JIS Z 2801 Antibacterial Evaluation Method, and determining the antimicrobial activity value for staphylococci calculated according to the following formula 7.0, and the antibacterial activity value against E. coli may be 1.0 to 7.5.

[Formula 2]

Antibacterial activity = log (M1 / M2)

In the formula (2), M1 is the number of bacteria after culturing the blank specimen at 35 ° C and RH 90% for 24 hours, M2 is the specimen after incubation for 24 hours at 35 ° C and RH 90% It is the number of bacteria. In this case, the thermoplastic resin can realize an excellent antibacterial property and is advantageous to be used in products such as household appliances and toys.

In a specific example, the thermoplastic resin composition may have a haze of 10% or less and a light transmittance of 80% or more as measured by ASTM D1003 in a specimen having a thickness of 2.5 mm. In such a case, the thermoplastic resin can realize excellent transparency, and thus has characteristics favorable to be used for household appliances, toys, and various kinds of products requiring transparency.

In a specific example, the thermoplastic resin composition may have a surface resistance of 10 10 ⁸ ? /? Or less measured at 23 占 폚 and 50% RH by ASTM D250 in a specimen having a thickness of 2.5 mm. In this case, the thermoplastic resin can realize excellent antistatic properties and voltage characteristics, and is advantageous to be used in various products requiring home appliances, office automation equipment, toys, and excellent electrical characteristics.

In the specific example, the thermoplastic resin composition may satisfy the following formula (3).

[Formula 3]

1000 mm ≤ Id

In Equation 3, Id is a drop height measured by a Du Pont drop test method using a metal weight of 1 kg with respect to a molded product specimen having a thickness of 2 mm. In such a case, the thermoplastic resin can realize excellent impact resistance, and thus has properties favorable to be used in various products requiring impact properties.

Another embodiment of the present invention relates to a molded article formed from the above-mentioned thermoplastic resin composition. The antimicrobial thermoplastic resin composition may be produced in the form of a pellet. The pellet may be manufactured into various molded articles through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those of ordinary skill in the art to which the present invention pertains.

As described above, the molded article formed from the thermoplastic resin composition of the present invention has an excellent effect of transparency, antistatic property, impact resistance and antibacterial property. Therefore, when it is applied to applications such as household appliances, office automation equipment, Can be used more advantageously.

Example

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

(A) a (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer

(a1) 73.85% by weight of methyl methacrylate, 5% by weight of acrylonitrile and 21.15% by weight of styrene were added to perform suspension polymerization, followed by dewatering and drying to obtain beads having a molecular weight of about 105,000 g / mol ) Methyl methacrylate-styrene-acrylonitrile copolymer was prepared and used.

(B) a (meth) acrylate resin

Polymethyl methacrylate resin (manufacturer: Lotte MRC, product name: TF-9) was used.

(C) Resin resin

(Manufactured by Sanyo, product name: PELECTRON AS) containing a polyetheresteramide block copolymer was used.

Example  1 and Comparative Example  1 to 4: Preparation of Thermoplastic Resin Composition

The above components were added in the amounts shown in Table 1, and then extruded at 230 캜 to prepare pellets. The pellets were extruded at a temperature of 250 ° C. and a mold temperature of 60 ° C. in a 6 Oz extruder at a temperature of 80 ° C. for 4 hours or more, . The properties of the prepared specimens were evaluated by the following methods, and the results are shown in Table 2 below.

ingredient Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 (A) 17 56 56 43 30 (B) 83 44 44 57 70 (C) 30 - 30 30 30

In Table 1, the weight basis of (A) and (B) is based on the total weight (100%) of (A) + (B) By weight based on 100 parts by weight of the total amount.

Property evaluation method

(1) Haze (%) and total light transmittance (%): Each 2.5 mm thick injection sample was measured using a haze meter according to ASTM D1003.

(2) Surface Resistance (Ω / □): Surface resistance was measured at 23 ° C. and 50% RH according to ASTM D250 for each 2.5 mm thick injection specimen.

(3) Antibacterial activity value: Staphylococcus and Escherichia coli were inoculated on a 5 cm × 5 cm size specimen according to JIS Z 2801 antibacterial evaluation method, and antibacterial activity values were determined according to the following formula 2.

[Formula 2]

Antibacterial activity = log (M1 / M2)

M1 is the number of bacteria after incubation for 24 hours at 35 DEG C and RH 90% condition for the blank specimen, M2 is the culture number of the thermoplastic resin composition specimen for 24 hours at 35 DEG C and RH 90% Post-bacterium count.)

(4) DuPont drop test: According to the DuPont drop test method, a rubber weight 0.5 kg and a metal weight 1 kg are dropped 20 times at a height of 1000 mm for each 2 mm thick injection specimen to check whether a crack occurs Respectively. And when the DuPont drop test was not passed due to the occurrence of cracks, the result was evaluated as " X ".

(5) Appearance characteristics: when the measured haze is 10% or less, the total light transmittance is 80% or more and the appearance characteristics are excellent, the haze is more than 10%, the total light transmittance is less than 90% Respectively.

(6) Electrical characteristics: When the measured surface resistance is less than 10 x 10 ⁸ Ω / □ and the electrical characteristics are suitable for use in household appliances, etc., the surface resistance exceeds 10 × 10 ⁸ Ω / □ And when the electrical characteristics were not suitable, the result was evaluated as x.

(7) Impact resistance: According to the DuPont drop test method, 1 kg of a metal weight was dropped 20 times from a height of 1000 mm to a 2 mm thick injection specimen, and the average fall height was measured. And the impact resistance was evaluated. And when it satisfied the following formula 3, it was evaluated as & cir &

[Formula 3]

1000 mm ≤ Id

In the above equation (3), Id is a drop height according to DuPont drop test using a 1 kg metal weight for a 2 mm thick injection specimen.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Total light transmittance (%) 83.84 92 80.58 81.25 83.56 Haze (%) 6.26 0.5 26.8 27.5 11.23 Surface resistance
(Ω / □) 2 * 10 ⁸ 2 * 10 ¹⁶ 1.2 * 10 ⁹ 8 * 10 ⁸ 2 * 10 ⁸ Antimicrobial activity
(Staphylococcus aureus) 4.6 0 4.6 4.6 4.6 Antimicrobial activity
(E. coli) 3.0 0 3.0 3.0 3.0 DuPont drop test
(Rubber, 0.5kg) ○ × ○ ○ ○ DuPont drop test
(Metal, 1kg) ○ × ○ ○ ○ Appearance characteristic ○ ○ × × × Electrical fitness ○ × × ○ ○ Impact resistance ○ × ○ ○ ○

From the results shown in the above Table 2, it was found that (A) 14 to 25% by weight of the (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and 75 to 86% by weight of the (B) 100 parts by weight of a base resin; And 25 to 35 parts by weight of a proprietary resin containing at least one of (C) a polyetheresteramide block copolymer, a polyalkylene glycol and a polyamide based on 100 parts by weight of the base resin. Example 1 of the present invention shows excellent transparency, antistatic property, impact resistance and antimicrobial property, and excellent balance among these properties.

On the other hand, Comparative Examples 1 to 4 in which the (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer in an excess amount and the (B) It is difficult to realize excellent electrical suitability, impact resistance or excellent appearance characteristics because of insufficient compatibility of the resin and the resin for preparation. In particular, Comparative Example 1, which does not contain a resin for preventing defects, has a very high surface resistance, easily cracks, can not realize antimicrobial properties, and thus has poor electrical characteristics, impact resistance and antibacterial properties.

It will be understood by those skilled 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.

Claims (6)

100 parts by weight of a base resin comprising 14 to 25% by weight of (A) a (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and 75 to 86% by weight of a (meth) acrylate resin (B); And
And 25 to 35 parts by weight of a resin (C) containing a polyether ester amide block copolymer based on 100 parts by weight of the base resin, wherein the thermoplastic resin composition comprises
The weight ratio of the (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer and the (B) (meth) acrylate resin in the base resin is 1: 3 to 1: 6,
Wherein the thermoplastic resin composition is a thermoplastic resin composition having a haze of 10% or less and a total light transmittance of 80% or more as measured by ASTM D1003 in a specimen having a thickness of 2.5 mm and satisfying at least one of the following (a) to (c)
(a) Staphylococcus and Escherichia coli were inoculated on a 5 cm x 5 cm specimen according to JIS Z 2801 Antibacterial Evaluation Method, and the antimicrobial activity value for staphylococci calculated according to the following Formula 2 was 2.0 to 7.0, When the antibacterial activity value is 1.0 to 7.5
[Formula 2]
Antibacterial activity = log (M1 / M2)
M1 is the number of bacteria after incubation for 24 hours at 35 DEG C and RH 90% condition for the blank specimen, M2 is the culture number of the thermoplastic resin composition specimen for 24 hours at 35 DEG C and RH 90% Post-bacterium count);
(b) a surface resistance of less than 10 × 10 ⁸ Ω / □ measured at 23 ° C and 50% RH by ASTM D250 on specimens of 2.5 mm thickness; And
(c) satisfying the following formula 3
[Formula 3]
1000 mm ≤ Id
(In the above formula 3, Id is a drop height measured by a Du Pont drop test method using a weight of 1 kg for a specimen ejected at a thickness of 2 mm).
The method according to claim 1,
The (A) (meth) acrylate-aromatic vinyl-cyanide vinyl copolymer is obtained by copolymerizing 20% by weight to 40% by weight of an aromatic vinyl monomer and a vinyl cyanide monomer; And 60 to 80% by weight of a (meth) acrylate monomer.
The method according to claim 1,
Wherein the resin (C) is a polyetheresteramide block copolymer, and the polyetheresteramide block copolymer comprises 10 to 95% by weight of a polyetherester block.
The method according to claim 1,
Wherein the base resin has a refractive index of 1.25 to 1.75.
The method according to claim 1,
A thermoplastic resin composition having a refractive index difference of 0.3 or less between a base resin represented by the following formula (1)
[Formula 1]
Refractive index difference = | (R1 - R2) |
In the above formula (1), R1 is the refractive index of the base resin, and R2 is the refractive index of the resin for defoaming.
A molded article formed from the thermoplastic resin composition according to any one of claims 1 to 5.