JPH08269312A - Permanently antistatic polycarbonate resin composition - Google Patents

Abstract

PURPOSE: To obtain a permanently antistatic polycarbonate resin composition which comprises an aromatic polycarbonate resin, a block copolyamide resin, an aromatic polyester resin, a shock resistance improver and a specific macromolecular compound and shows excellent antistatic properties, appearance, shock resistance and heat resistance. CONSTITUTION: This resin composition comprises (A) 50-95 pts.wt. of an aromatic polycarbonate resin, for example, a polycarbonate derived from bisphenol- A, (B) 2-40 pts.wt. of a block copolyamide resin having a polyamide block and a polyether-ester block, (C) 2-50 pts.wt. of an aromatic (co)polyester resin such as that produced by polycondensation reaction between terephthalic acid and isophthalic acid and glycols, and (D) 0-30 pts.wt. of a shock resistance improver of an acrylate ester core-shell graft copolymer and (E) a macromolecular compound of the formula a HO(R-O)n -H (R is a 2-8C alkyl (n) is 20-1,500).

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a permanent antistatic polycarbonate resin composition. The present invention
Heat resistance, less deterioration in impact resistance, further relates to a resin composition having a significantly improved antistatic property, particularly because it has a permanent antistatic property, the durability of the antistatic property is required, It can be used for electrical and electronic equipment or precision machinery.

[0002]

2. Description of the Related Art Generally, a synthetic polymer material has a high electric resistance value and is easily charged by friction, peeling, or the like and adsorbs dust or dust to impair its appearance. Further, in the electric and electronic fields, troubles due to them often occur, and a new material excellent in permanent antistatic property is required.

Conventionally, various studies have been attempted as means for imparting antistatic properties to synthetic resin products, and generally, a surfactant-based antistatic agent is applied to a molded product,
Alternatively, a method of imparting antistatic properties by kneading an antistatic agent into a resin material is known.

However, such means has a drawback that the antistatic agent in the surface layer is removed and the antistatic property is lost after long-term use. Further, there is a drawback that the antistatic property is lost due to frictional wear and the like.

Among them, a polycarbonate resin composition having a permanent antistatic property is disclosed in, for example, JP-A-62-2.
73252 has a polyether ester unit of 95 to 10
It proposes a resin composition comprising a polyether ester amide in a weight percentage and a polycarbonate resin. Further, JP-A-1-163252 discloses a polyether ester amide having a polyether ester unit content of 90 to 10% by weight, a polycarbonate resin and an aromatic vinyl monomer, a (meth) acrylic acid ester monomer, and a vinyl cyanide monomer. Polymer compositions of vinyl monomers selected from monomers and bismaleimide monomers and resin compositions composed of rubbery polymers have been proposed. The present inventor has also studied and filed a patent for a composition having a permanent antistatic property. That is,
Japanese Patent Application No. 6-15288 proposes a permanent antistatic resin composition having improved thermal stability, which is obtained by adding a compound having a spiro ring to a polycarbonate resin, a polyester resin and a block copolyamide resin.

[0006]

However, in each of these permanent antistatic resin compositions, the antistatic property is improved to some extent, but the elastic modulus decreases due to the block copolyamide, and the dimensional change due to water absorption. Moreover, the appearance of the molded product may be deteriorated, which is not sufficient. In view of these circumstances, the present invention has significantly improved antistatic properties, maintains excellent antistatic properties even during long-term use, does not cause a defective appearance of the molded product, and has impact strength and heat resistance. The present invention provides a polycarbonate resin composition with less decrease in

[0007]

Means for Solving the Problems In view of the above-mentioned problems, the inventors of the present invention have conducted a number of tests and researches, and as a result, by adding a polymer compound having a specific structure to a conventional antistatic composition. It has been found that the antistatic property can be significantly improved and the deterioration of the antistatic property due to washing with water can be significantly suppressed.

That is, in the present invention, (a) 50 to 95 parts by weight of aromatic polycarbonate resin, (b) 2 to 40 parts by weight of block copolyamide resin, (c) 2 to 50 parts by weight of aromatic polyester resin, (d) ) It relates to a composition comprising 0 to 30 parts by weight of an impact modifier and (e) a polymer compound having the following structure.

HO- (R-O) n-H (In the formula, R is an alkyl group having 2 to 8 carbon atoms, and n is an integer of 20 to 1500.)

The present invention significantly improves the antistatic property by adding a polymer compound having a specific structure,
Even if other mold release agents or slidability improvers are added, the intended antistatic property is not impaired, and the appearance defects such as pearl luster and peeling phenomenon are improved. Further, the present invention was not able to obtain the durability of antistatic property by the conventional technology, the effect was not recognized even when it was added to the surfactant or the polycarbonate resin. It is possible to achieve the durability of the property.

Hereinafter, the present invention will be described specifically. The aromatic polycarbonate resin, which is one component of the composition of the present invention, is not particularly limited as long as it is a polycarbonate ester derived from an aromatic dihydroxy compound. That is, a homopolymer derived from a single aromatic dihydroxy compound, a copolymer derived from two or more kinds of aromatic dihydroxy compounds, and an aromatic polymer having three or more hydroxy groups in a molecule. Either branched copolymers derived from aromatic dihydroxy compounds containing small amounts of hydroxy compounds or end-modified polymers derived from aromatic hydroxy compounds containing small amounts of aromatic monohydroxy compounds can be used. Of course, a mixture of two or more of these polymers or copolymers may be used as the aromatic polycarbonate resin. Incidentally, these various kinds of polymers are usually obtained by reacting an aromatic dihydroxy compound or a small amount thereof with an aromatic polyhydroxy compound and the like with a phosgene or a diester of carbonic acid. It is not limited by the manufacturing method of the united body.

Examples of the aromatic dihydroxy compound include 2,2-bis (4-hydroxyphenyl) propane (also referred to as bisphenol A), tetramethylbisphenol A, tetrabromobisphenol A and bis (4).
-Hydroxyphenyl) -p-diisopropylbenzene, hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl and the like can be used. Usually, a bis (4-hydroxyphenyl) alkane-based dihydroxy compound is selected, and bisphenol A or a combination of bisphenol A and another aromatic dihydroxy compound is particularly preferable.

Specific examples of the aromatic polyhydroxy compound used for obtaining the branched copolymer include phloroglucinol and 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl). Heptene-2,4,6-
Dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptene-3,1,3,5
-Tri (4-hydroxyphenyl) benzene, 1,1,
1-tri (4-hydroxyphenyl) ethane etc. are mentioned. Its precursor compound, 3,3-bis (4-
Hydroxyaryl) oxindole (also called isatin bisphenol), 5-chlorisatin, 5,7-
Dichlorisatin, 5-bromoisatin, etc. can also be used. The amount of the aromatic polyhydroxy compound or its precursor compound used is selected such that a part of the dihydroxy compound, for example, 0.1 to 2 mol% is replaced with the polyhydroxy compound.

Further, as a monovalent aromatic hydroxy compound suitable for terminal modification, that is, for controlling the molecular weight,
Phenols substituted at the m-position or p-position are common, and specifically, m-methylphenol, p-methylphenol, m-propylphenol, p-propylphenol, p-tert-butylphenol, Alkyl-substituted compounds such as p-long-chain alkyl-substituted phenol, p-
Halogen-substituted products such as bromphenol are preferred.

In the present invention, the molecular weight of the aromatic polycarbonate resin is 10,000 to 1 as a viscosity average molecular weight calculated from the viscosity of a methylene chloride solution at 25 ° C.
Those in the range of 00000, preferably 15,000 to 50,000 are used.

The block copolyamide resin, which is another component of the composition of the present invention, has a polyamide block and a polyether ester, and the polyamide block and the polyether ester block have an ester bond (--COO--).
Alternatively, they are linked by an amide bond (-CONH-).

In the present invention, the repeating units constituting the polyamide block are a) in the case of an aminocarboxylic acid having 6 or more carbon atoms or a lactam thereof, and b) in a diamine having 6 or more carbon atoms and a dicarboxylic acid. It may be salt. Of course, both may be mixed. As specific repeating units, in the case of a), 6-aminocaproic acid, 7-aminoenanthic acid,
8-aminocaprylic acid, 9-aminopergonic acid, 10-
Aminocapric acid, 11-aminoundecanoic acid, 12-
Examples thereof include ω-aminocarboxylic acids such as aminododecanoic acid and ω-lactams such as caprolactam, enantolactam, capryllactam and laurolactam.
In the case of b), a diamine such as hexamethylenediamine-adipate, hexamethylenediamine-sebacate, and hexamethylenediamine-isophthalate-
Examples include salts of dicarboxylic acids. Practically, caprolactam, 12-aminododecanoic acid, and hexamethylenediamine-adipate are particularly preferably used.

The repeating unit constituting the polyether ester block has a number average molecular weight of 200 to 6000.
Of poly (alkylene oxide) glycol polyether segment and dicarboxylic acid having 4 to 20 carbon atoms. In the polyetherester block, the molar ratio of polyether segment to dicarboxylic acid is usually 1:
It is 1.

However, as the poly (alkylene oxide) glycol, polyethylene glycol, poly (1,2-propylene oxide) glycol, poly (1,3-propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly ( Hexamethylene oxide) glycol, a block or random copolymer of ethylene oxide and propylene oxide, a block or random copolymer of ethylene oxide and tetrahydrofuran, and the like. Among these, polyethylene glycol is particularly preferably used because of its excellent antistatic property.

Further, as the dicarboxylic acid having 4 to 20 carbon atoms, terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-
Aromatic dicarboxylic acids such as dicarboxylic acid, diphenyl-4,4-dicarboxylic acid, diphenoxyethanedicarboxylic acid and sodium 3-sulfoisophthalate, 1,4
Alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, dicyclohexyl-4,4-dicarboxylic acid, succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanedicarboxylic acid (decanedicarboxylic acid) Aliphatic dicarboxylic acid etc. are mentioned. Among them, especially terephthalic acid, isophthalic acid, 1,
4-Cyclohexanedicarboxylic acid, adipic acid, sebacic acid and dodecanedioic acid are preferably used in terms of polymerizability, color tone and physical properties.

In the composition of the present invention, it is important that the block copolyamide resin is selectively ubiquitous in the surface layer of the molded product from the viewpoint of imparting antistatic properties to the molded product. For this, the block copolyamide resin used has a weight average molecular weight of 50,000 to 20,000.
0, preferably in the range of 70,000 to 120,000. When the weight average molecular weight is less than 50,000, the dispersion of the block copolyamide resin in the composition becomes unstable, and the antistatic property of the composition is easily affected by the molding conditions. On the other hand, when it exceeds 200,000, it becomes difficult for the block copolyamide resin to form the surface layer of the molded article of the composition, and the antistatic effect becomes insufficient. Regarding the relationship with other resin components in the composition, the molecular weight of each resin is selected so that the viscosity difference between the aromatic polycarbonate resin and the aromatic polyester resin and the block copolyamide resin at the time of melting becomes small. It is essential. As a result, the peeling phenomenon does not occur even under more severe conditions, and more stable antistatic property is achieved. The composition of the block copolyamide resin is preferably such that the polyether ester block unit is in the range of 95 to 10% by weight in the block copolyamide resin. 95% by weight of polyetherester block unit
When it exceeds, the block copolyamide resin can be omnipresent in the surface layer of the molded product, but the surface hardness is low, the surface is easily scratched, and the mechanical strength is low. On the other hand, if it is less than 10% by weight, the antistatic property of the obtained resin is insufficient. When the block copolyamide resin is added in an amount necessary to satisfy the antistatic effect, heat resistance and mechanical strength are significantly reduced.

The block copolyamide resin is not limited by the manufacturing method. That is, as a method for polymerizing a block copolyamide, for example, (A) (a) an aminocarboxylic acid or lactam and (c) a dicarboxylic acid are reacted to prepare a polyamide prepolymer having carboxylic acid groups at both ends, and (b) ) Method of reacting poly (alkylene oxide) glycol under vacuum, (B) (a) (b)
The compound of (c) is charged into a reaction tank and pressure-reacted at high temperature in the presence or absence of water to produce a carboxylic acid-terminated polyamide prepolymer, and then the polymerization is advanced under normal pressure or reduced pressure. Method and (C) above (a)
A known method such as a method in which the compounds (b) and (c) are simultaneously charged into a reaction vessel and melt-mixed, and then the polymerization is carried out all at once under high vacuum can be used.

The aromatic polyester resin, which is another component of the composition of the present invention, is a polyester having an aromatic dicarboxylic acid and a glycol as constituent units, which is known as an engineering plastic, or a resin containing the polyester as a main component. Is used. By using these aromatic polyester resins in combination, the dispersibility of the block copolyamide resin, which is an antistatic agent, is improved, and as a result, the poor appearance such as peeling and the antistatic property are improved. Usually, it is selected from polymers and copolymers obtained by polycondensation reaction of terephthalic acid, isophthalic acid or its ester-forming derivative with glycol. Among them, polyalkylene terephthalates, such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), obtained by polycondensation reaction of terephthalic acid or its dialkyl ester with aliphatic glycols, or a copolymer mainly composed of these are It is preferably used.

As the glycol, for example, ethylene glycol, propylene glycol, tetramethylene glycol, hexamethylene glycol or the like is used. These aliphatic glycols can be used in combination with other diols and polyhydric alcohols in a small amount. In particular,
For example, cyclohexanediol, cyclohexanedimethanol, xylene glycol, 2,2-bis (4-hydroxyphenyl) propane, glycerin, pentaerythritol and the like can be used in combination. Further, the amount of these other diols or polyhydric alcohols used is preferably in the range of 40 parts by weight or less with respect to 100 parts by weight of the aliphatic glycol.

As the aromatic dicarboxylic acid, for example, terephthalic acid or its dialkyl ester such as dimethyl terephthalate is used. With these, a small amount of other dicarboxylic acid or polyvalent carboxylic acid can be used in combination. Specifically, for example, phthalic acid,
Isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid, adipic acid, sebacic acid, trimellitic acid and their dialkyl esters can be used in combination. The amount of these other carboxylic acids or their esters used is preferably 40 parts by weight or less based on 100 parts by weight of terephthalic acid or its dialkyl ester.

In the present invention, the aromatic polyester resin having a number average molecular weight in the range of 2000 to 60,000 is used, and more preferably in the range of 25,000 to 52,000.

The following structure, which is another component of the composition of the present invention:

Embedded image As a polymer compound having HO— (R—O) n —H (wherein, R is an alkyl group having 2 to 8 carbon atoms, and n is an integer of 20 to 1500) Polyethylene glycol, poly (1,2-propylene oxide) glycol, poly (1,3-propylene oxide) glycol, poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol, ethylene oxide and propylene oxide block or random Poly (alkylene oxide) glycols such as copolymers, block or random copolymers of ethylene oxide and tetrahydrofuran are used. Among these, polyethylene glycol is particularly preferably used because of its excellent antistatic property. These polymer compounds usually have a hydroxyl group at the terminal, but derivatives blocked with a compound reactive with those terminal groups can also be used. Specific examples of such polymer compounds include linear or branched alkyl polyoxyethylene ethers, polyoxyethylene alkylphenyl ethers, polyethylene glycol fatty acid esters, and polyoxyethylene alkylamines. Also,
When the polyalkylene glycol component of the polymer compound and the polyalkylene glycol component forming the polyether ester block are the same, the addition effect is improved, which is preferable. The effective compounding amount of the above-mentioned polymer compound varies depending on the composition of other components, but is usually 1 to 1
It is 0 part by weight, preferably 1 to 5 parts by weight. Furthermore, the above-mentioned polymer compound used in the present invention can be used in combination with a surfactant.

The impact modifier which is another component preferably used in the composition of the present invention is, for example,
Acrylic ester-based core-shell graft copolymer,
Styrene core-shell graft copolymer, MBS resin, MABS resin, polyester elastomer, SB
R, SEBS, polyurethane elastomer, etc. are exemplified. Among these, an acrylic acid ester-based core-shell graft copolymer is particularly preferably used because of its compatibility with a matrix such as a polycarbonate resin and heat resistance.

In the resin composition of the present invention, the composition ratio of each of the above components is slightly different depending on the presence or absence of the aromatic polyester resin. That is, when the aromatic polyester resin is not included, (a) the aromatic polycarbonate resin 60 to
98 parts by weight, preferably 70 to 95 parts by weight, (b) block copolyamide resin 2 to 40 parts by weight, preferably 5 to
15 parts by weight, (d) 0 to 30 parts by weight of impact modifier, preferably 1 to 10 parts by weight, (e) 1 to 30 parts by weight, preferably 1 to 15 parts by weight of the polymer compound having the structure of Chemical formula 1 above. In the case of containing an aromatic polyester resin, (a) the aromatic polycarbonate resin is 50 to 95 parts by weight, preferably 70 to 90 parts by weight, and (b) the block copolyamide resin is 2 to 40 parts by weight, preferably 5 to 15 parts by weight, (c) 2 to 50 parts by weight of aromatic polyester resin, preferably 5 to 30 parts by weight, (d) impact modifier 0 to 30
Parts, preferably 1 to 10 parts by weight, (e) 1 to 30 parts by weight, preferably 1 to 30 parts by weight of the polymer compound having the structure of Chemical formula 1 above.
The ratio is 15 parts by weight.

In the resin composition of the present invention, when the amount of the aromatic polycarbonate resin (a) is small, the heat resistance is poor, and when it is large, the antistatic property is insufficient, which is not preferable. If the block copolyamide resin (b) is too small, the antistatic property is insufficient, and if it is too large, the resin composition becomes too flexible and the mechanical strength becomes poor, which is not preferable. If the amount of the aromatic polyester resin (c) is small, the effects of improving the above-mentioned various properties such as the improvement of the peeling phenomenon are insufficient, and if the amount is large, the heat resistance is greatly reduced, which is not preferable. When the amount of the impact modifier (d) is small, the impact resistance is lowered, and when the amount is large, the elastic modulus is largely lowered, which is not preferable. (E) When the amount of the polymer compound having the structure of the above chemical formula 1 is small, the effect of improving the antistatic property is poor, and when it is large, the heat resistance of the resin composition is significantly deteriorated, which is not preferable.

There is no particular limitation on the method for producing the resin composition of the present invention. For example, (a) aromatic polycarbonate resin, (b) block copolyamide resin and (e)
A method of collectively melting and kneading the polymer compound having the structure of Chemical Formula 1, optionally together with (c) an aromatic polyester resin and (d) an impact modifier,
(A) and (b) and (e) or (a) and (c) and (e) are melt-kneaded in advance, and then (c) or (b) and (d) are added and melt-kneaded. Any method can be selected.

In addition to the above components, the resin composition of the present invention contains various stabilizers such as ultraviolet absorbers, pigments, dyes, lubricants,
Additives such as flame retardants, mold release agents, slidability improvers, or reinforcing agents such as glass fibers, glass flakes, carbon fibers or whiskers such as potassium titanate and aluminum borate, if necessary. it can. When the brominated polymer compound of the above chemical formula 1 is used, flame retardancy can be achieved by using it alone or in combination with a flame retardant aid such as an antimony compound and an anti-dripping agent. Further, the resin composition of the present invention does not deteriorate the intended antistatic effect even when used together with a surface property improving agent such as a releasing agent or a slidability improving agent.

[0032]

EXAMPLES The present invention will be specifically described below with reference to Examples and the like. The evaluation of physical properties is performed by drying the resin composition pellets of Examples or Comparative Examples at 120 ° C. for 5 hours, molding a designated test piece at a cylinder temperature of 260 ° C. with an injection molding machine, and performing the following steps. It was

1) Antistatic Property Regarding the antistatic property, a) a surface specific resistance value and b)
The charging half-life was measured. a) Surface specific resistance: Ultra high resistance meter (manufactured by Advantest) is used and ASTM D-
According to 257, the test piece was allowed to stand for 7 days under the conditions of a temperature of 23 ° C. and a humidity of 50%, and then the surface resistivity was measured. The smaller the value, the better the antistatic property can be evaluated. b) Charge half-life: Using a static Honest meter (manufactured by Shishido Electrostatics Co., Ltd.), test the test piece with a printing voltage of 7K.
It was charged under the conditions of V and a loading time of 30 seconds, its charge amount was measured, and the applied voltage was cut off to measure the decay state of the charge amount. The half-life represents the time until the charge amount (relative value) is halved after the applied voltage is cut off. The smaller the value, the better the antistatic property can be evaluated.

2) Deflection Temperature Under Load According to ASTM D-648, a rod-shaped test piece having a thickness of 6.4 mm was measured under a high load condition. The higher this value is, the better the heat resistance can be evaluated.

3) Izod According to ASTM D-256, the impact strength of the notched test piece was measured. 4) Appearance Regarding the appearance, the molded product was visually observed for the presence of defective phenomena (silver streaks, etc.). The evaluation was based on the following criteria. That is, ○ means good (no defective phenomenon), and △ means
Slightly defective, x indicates defective (there are many defective phenomena).

In the examples below, the terms and abbreviations used have the following meanings. (Terms or abbreviations) (Meaning) E-2000 Mitsubishi Gas Chemical Co., Inc., trade name Iupilon E-2000. Poly-4,4'-isopropylidene diphenyl carbonate having a viscosity average molecular weight of 28,000. PAS-40T Toray Industries, Inc., trade name PAS-40T. Polyether block copolyamide having a weight average molecular weight of 100,000. A block copolymer of 6-nylon and polyethylene glycol / diester. PEP-36 Phosphorus-containing compound manufactured by Asahi Denka Co., Ltd., trade name ADEKA STAB P EP-36. It is represented by the following chemical formula.

Embedded image PA-200 Mitsubishi Rayon Co., Ltd., trade name Diapet PA-200D. Polyethylene terephthalate with a number average molecular weight of 51,000. MG-1011 Impact modifier manufactured by Takeda Pharmaceutical Co., Ltd., trade name Staphyroid MG-1011. Acrylic ester-based core-shell graft copolymer. PEG1000 Polyethylene glycol. Number average molecular weight of about 1000. PEG6000 Polyethylene glycol. Number average molecular weight of about 6000. PEG10000 Polyethylene glycol. Number average molecular weight of about 10,000. SAS Sodium alkyl sulfonate having 11 carbon atoms.

[0037]

Example 1 (a) Aromatic polycarbonate resin E-2000 67 parts by weight (b) Block copolyamide resin PAS-40T 10 parts by weight (c) Aromatic polyester resin PA-200 15 parts by weight (d) Impact modifier MG-1011 5 parts by weight (e) Polymer compound PEG1000 3 parts by weight (f) Phosphite antioxidant PEP-36 0.1 parts by weight After blending each of the above components with a tumbler for 20 minutes, biaxial extrusion Extruded at a cylinder temperature of 260 ° C. using a machine to obtain pellets. The composition and evaluation results of physical properties are shown in Table 1.

[0038]

[Example 2] The polymer compound PEG1 in Example 1
Pellets were obtained in the same manner as in Example 1 except that 000 was changed to PEG10000. The composition and evaluation results of physical properties are also shown in Table 1.

[0039]

[Example 3] The polymer compound PEG1 in Example 1
000 was replaced with a melt mixture having the following composition (e) Polymer compound PEG6000 2.1 parts by weight Surfactant SAS 0.9 parts by weight, and pellets were obtained in the same manner as in Example 1. The composition and evaluation results of physical properties are also shown in Table 1.

[0040]

[Example 4] In Example 1, the amount of E-2000 was changed to 7
Pellets were obtained in the same manner as in Example 1 except that the amount was changed to 2 parts by weight and no impact modifier was added. The composition and evaluation results of physical properties are also shown in Table 1.

[0041]

[Table 1]

[0042]

COMPARATIVE EXAMPLE 1 In Example 1, the amount of E-2000 was changed to 7
Pellets were obtained in the same manner as in Example 1 except that the content was changed to 0 parts by weight and no polymer compound was added. The composition and the evaluation results of physical properties are also shown in Table 2. Compared to Example 1,
The initial half-life was prolonged, and the effect was observed to decrease even after washing with water.

[0043]

[Comparative Example 2] In Example 3, the amount of E-2000 was changed to 7
Pellets were obtained in the same manner as in Example 3 except that the amount of block copolyamide resin was changed to 7 parts by weight. The composition and the evaluation results of physical properties are shown in Table 2. Compared with Example 1, the initial half-life was good, but the effect was not observed after washing with water.

[0044]

Comparative Example 3 In Example 1, the amount of E-2000 was changed to 7
Pellets were obtained in the same manner as in Example 1 except that the amount of block copolyamide resin was changed to 7 parts by weight. The composition and the evaluation results of physical properties are also shown in Table 2. As compared with Example 1, no antistatic property was observed.

[0045]

Comparative Example 4 The polymer compound PEG1 in Example 1 was used.
000, and pellets were obtained in the same manner as in Example 1 except that the surfactant SAS was added. The composition and the evaluation results of physical properties are also shown in Table 2. Compared with Example 1, the effect of improving the antistatic property was small, and silver streaks occurred in the molded product, resulting in poor appearance.

[0046]

[Comparative Example 5] In Example 1, the amount of E-2000 was changed to 7
Pellets were obtained in the same manner as in Example 1, except that the amount of the polymer compound was changed to 5 parts by weight, and neither the polymer compound nor the impact modifier was added. The composition and the evaluation results of physical properties are also shown in Table 2. Example 1
Compared with, the initial half-life was very long and the effect was observed to be reduced even after washing with water.

[0047]

[Table 2]

[0048]

As is clear from the above results, the polycarbonate resin composition of the present invention has good thermal stability, heat resistance and durability of antistatic property, and further has improved antistatic property. It is a composition and can be used in many applications as a permanent antistatic material.

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Claims (8)

[Claims] 1. A (a) aromatic polycarbonate resin 50 to
95 parts by weight, (b) block copolyamide resin 2-40
Parts by weight, (c) 2 to 50 parts by weight of the aromatic polyester resin, (d) 0 to 30 parts of an impact modifier, and (e) a permanent antistatic property containing an effective amount of a polymer compound having the following structure. Polycarbonate resin composition. HO- (R-O) n-H (In the formula, R is an alkyl group having 2 to 8 carbon atoms, and n is an integer of 20 to 1500.) 2. The polymer compound is polyethylene glycol, poly (1,2-propylene oxide) glycol, poly (1,3-propylene oxide) glycol,
The resin composition according to claim 1, which is poly (tetramethylene oxide) glycol, poly (hexamethylene oxide) glycol or a derivative thereof. 3. The resin composition according to claim 1, wherein the effective amount of the polymer compound is 1 to 10 parts by weight. 4. The resin composition according to claim 1, wherein the block copolyamide resin has a polyamide block and a polyether ester block. 5. The block polyamide block comprises an aminocarboxylic acid having 6 or more carbon atoms or a lactam thereof and / or a salt of a dicarboxylic acid having 6 or more carbon atoms and a dicarboxylic acid as a constituent unit, and the polyether. The ester block is a poly (alkylene oxide) glycol having a number average molecular weight of 200 to 6000 and a carbon number of 4
The resin composition according to claim 4, wherein the dicarboxylic acid of 20 to 20 is a constituent unit. 6. The aromatic polycarbonate resin is 2,
Polycarbonate resin derived from 2-bis (4-hydroxyphenyl) propane or 2,2-bis (4-
The resin composition according to claims 1 to 5, which is a polycarbonate copolymer derived from hydroxyphenyl) propane and another dihydroxy compound. 7. The aromatic polyester resin is selected from polymers and copolymers obtained by polycondensation reaction of terephthalic acid, isophthalic acid or its ester-forming derivative with glycols. ~ 6 resin composition. 8. The impact modifier is selected from acrylic ester type core-shell graft copolymer, styrene type core-shell graft copolymer, MBS resin, MABS resin, polyester type elastomer, SBR, SEBS and polyurethane type elastomer. The resin composition according to claim 1, which is a resin composition.