KR100435920B1 - Polycarbonate Resin Composition - Google Patents

Abstract

A method for producing a polycarbonate-based resin composition comprising a polycarbonate as a main component and an antistatic agent and a compatibilizer of the following general formula (1). A polycarbonate-based resin composition comprising 1 to 5 parts by weight of the compound of 1) and 1 to 5 parts by weight of a high molecular compound having a reactive structure in the polystyrene main chain as a compatibilizer.

The resin composition prepared by the present invention is a transparent thermoplastic resin composition having excellent antistatic properties.

Description

Polycarbonate Resin Composition

Polycarbonate is a useful engineering plastic material that is widely used in various fields such as electric and electronic materials, optics, general miscellaneous goods due to its strong structure in terms of heat resistance and impact resistance.

However, in the case of applying such a polycarbonate resin as a storage and transport container for electric and electronic parts, when the container is charged by static electricity generated by friction of transport, etc. High voltage discharges cause fatal damage to the contents.

Therefore, when the polycarbonate is applied to such electronic materials, it is necessary to prevent the charging by such static electricity by an appropriate method.

As a part of this method, Japanese Patent Laid-Open Nos. 2-196852 and 2-99559 disclose the use of a diglycerin fatty acid ester compound and a phosphorus-based anti-oxidant for polycarbonate, thereby providing excellent antistatic properties and maintaining transparency. The resin composition is provided.

However, when such a diglycerin fatty acid ester compound is used as an antistatic agent, the purpose of transparency and antistatic property is achieved, but since the molecular weight of the compound support used as an antistatic agent is relatively low, the addition of a plasticizer during melt mixing with a high molecular weight polycarbonate The effect such as poetry is manifested, and the overall mechanical and thermal properties, in particular the impact resistance, are a serious problem.

Therefore, in the present invention, in order to solve this problem, by using a high molecular weight copolymer of the polystyrene system of the following general formula (1) as an antistatic agent and using a compatibilizing agent of the polystyrene system, it is excellent in transparency, impact resistance and antistatic property. A thermoplastic resin composition was prepared.

The present invention is to provide a thermoplastic polycarbonate-based resin composition having excellent antistatic properties and transparency, using a polycarbonate as a main component and using an antistatic agent and a compatibilizer of the general formula (1). It relates to a manufacturing method.

Hereinafter, the present invention will be described in detail.

The compound of the general formula (1) may be used in an amount of 1 to 5 parts by weight based on 100 parts by weight of polycarbonate, but it is advantageous to use a high molecular weight if possible to minimize the plasticizer effect described above.

If the amount of the compound of Formula (1) is less than 1 part by weight based on 100 parts by weight of the pulley carbonate, the effect of antistatic will be insignificant, and if it exceeds 5 parts by weight, the overall mechanical properties, thermal properties and impact resistance will be reduced. Will result.

In addition, in the present invention, since the compatibility between the added antistatic agent polystyrene copolymer and the main component resin is not good, desired physical properties cannot be obtained, so that the compatibilizer is 1 to 5 parts by weight based on 100 parts by weight of polycarbonate. The structure uses a compound whose main chain is polystyrene and whose branched structure has a small amount of reactive groups of 0.1 to 10 mol% based on the main chain.

If the content of the compatibilizer is less than 1 part by weight based on 100 parts by weight of polycarbonate, the compatibility improvement effect is insignificant. When the content of the compatibilizer exceeds 5 parts by weight, the fluidity and impact resistance are deteriorated.

In addition, when the content of the reactive group is less than 0.1 mol% with respect to the main chain, the compatibility of the polycarbonate which is the main component resin in the antistatic agent becomes poor, and the improvement effect of general properties, particularly impact resistance, is weak. When the content exceeds 10 mol%, the fluidity deteriorates. This causes problems in extrusion and injection molding.

Reactive groups that can be used in the present invention include maleic anhydride, oxazoline, glycidyl methacrylate and the like.

Example 1

2 parts by weight of an antistatic agent of the general formula (1) (R is a thraryl group and R 'is an N-butyl group) based on 100 parts by weight of the main component polycarbonate (Samyang Chemical, TRIREX 3025A), and the main chain is polystyrene The reactive group was prepared by using 1 part by weight of maleic anhydride having 8 mol% of the main chain, and the physical properties thereof are shown in Table 1.

Example 2

Glyceryl monostearate maleic acid was used as an antistatic agent, and the same procedure as in Example 1 was conducted except that the content of the composition was as shown in Table 1.

Example 3

The same procedure as in Example 1 was carried out except that 1 part by weight of polystyrene as a compatibilizer and 2 mol% of the reactive group with respect to the main chain were used as maleic anhydride.

Example 4

The same procedure as in Example 1 was carried out except that the reactive group of the compatibilizer species was oxazoline.

Example 5

The same procedure as in Example 2 was carried out except that the reactive group in the compatibilizer was glycidyl methacrylate.

Comparative Examples 1 to 4

Except that the content of the composition as shown in Table 1 was carried out in the same manner as in Example 1.

TABLE 1

Impact strength was measured by ASTM D 256 method at 3.2t room temperature.

The heat deflection temperature was measured by ASTM D 638 at 18.6 kg.

The melt index was measured by ASTM D 1238 at 260 ° C. and 2.16 kg.

The surface resistance was injection molded of 100 mm diameter and 3.2 mm thick plate-shaped specimens, and SRM-110, a portable surface resistance measuring instrument of Pinion, USA was used.

As described above, the present invention was able to prepare a transparent polycarbonate composition having excellent antistatic properties by using polycarbonate as the main component resin and the above-mentioned compatibilizer. It has suitable properties for transportation and storage containers in the manufacturing process, especially for containers of precision electrical and electronic components that may be damaged by static electricity or dust.

Claims (1)

1 to 5 parts by weight of the compound of formula (1) as an antistatic agent, and 1 to 5 parts by weight of a polymer compound having a reactive group in the polystyrene backbone as a compatibilizer, based on 100 parts by weight of polycarbonate Polycarbonate-based resin composition.

Claim 2 The polycarbonate resin composition according to claim 1, wherein the compatibilizer comprises a reactive group having a branched structure of 0.1 to 10 mol% based on maleic anhydride or oxazoline or glycidyl methacrylate and a main chain of polystyrene. .