JP2001072846A - Polycarbonate resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polycarbonate resin composition that has excellent fluidity, shock resistance and flame retardancy and is useful in the fields of OA(office automation) instrument, electric and electronic appliances and the like by blending a specified polytetrafluoroethylene(PTFE) into a specified aromatic polycarbonate (PC resin) at a specified ratio. SOLUTION: The objective polycarbonate resin composition comprises 100 pts.wt. in total, of (A) an aromatic polycarbonate-polyorgano-siloxane copolymer bearing a terminal group represented by formula I (R1 is a 1-9C alkyl or the like; a is 0-5) and (B) an aromatic polycarbonate bearing a terminal group of formula II (R2 is a 10-20C alkyl), and (C) 0.05-1 pt.wt. of PTFE [for example, Algoflon F5 (trade name) (manufactured by Montefluos company)]. In a preferred embodiment, the amount of the component B is 40-80 wt.% based on the total of these PC resins A and B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition having excellent fluidity, impact resistance and flame retardancy.

[0002]

2. Description of the Related Art Polycarbonate resins are excellent in mechanical strength (particularly, impact resistance), electrical properties, transparency, etc., and are widely used as engineering plastics in various fields such as OA equipment, electric / electronic equipment, and automobiles. It's being used. Some of these fields of use include O
There are fields where flame retardancy is required, mainly in the field of A devices and electric / electronic devices.

[0003] Polycarbonate resins have a high oxygen index and a self-extinguishing property among various thermoplastic resins.
The flame retardancy level required in the field of A equipment and electric / electronic equipment is generally as high as V-0 level in UL94 standard,
Flame retardancy is generally imparted by adding a flame retardant and a flame retardant auxiliary.

However, the use of such additives reduces the impact resistance and heat resistance. As a method for solving the problem, a composition of a polycarbonate resin, a polycarbonate-polyorganosiloxane copolymer, and polytetrafluoroethylene has been disclosed (Japanese Patent Application Laid-Open No. H8-208).
-81620). By the way, recently, there is a demand for a flame-retardant material which can be formed into a large-sized thin wall and has excellent fluidity, such as a housing of a copying machine or a printer. However, in the above technique, although the fluidity can be improved by reducing the molecular weight of the polycarbonate-polyorganosiloxane copolymer, there is a problem that the impact resistance is reduced. Although the fluidity can be improved by reducing the molecular weight of the polycarbonate resin, there is a problem that the flame retardancy and the impact resistance are deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a polycarbonate resin composition having excellent fluidity, impact resistance and flame retardancy. .

[0006]

Means for Solving the Problems As a result of extensive studies, the present inventors have found that an aromatic polycarbonate-polyorganosiloxane copolymer having a general terminal group and an aromatic polycarbonate having a specific terminal group are contained. The present inventors have found that a polycarbonate resin composition in which a specific polytetrafluoroethylene is blended with an aromatic polycarbonate resin can meet the above object of the present invention, and have completed the present invention. That is, the gist of the present invention is as follows. 1. The following equation (1)

[0007]

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(Wherein R ¹ represents an alkyl group having 1 to 9 carbon atoms, an aryl group having 6 to 20 carbon atoms or a halogen atom, and a represents an integer of 0 to 5). Aromatic polycarbonate-polyorganosiloxane copolymer (A) having a terminal group and the following formula (2)

[0009]

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(Wherein R ² is an alkyl group having 10 to 20 carbon atoms) The fibril-forming ability is based on 100 parts by weight of an aromatic polycarbonate resin containing an aromatic polycarbonate (B) having a terminal group represented by the following formula: Average molecular weight 50
Polytetrafluoroethylene (C) of ≥000
A polycarbonate resin composition containing 0.05 to 1 part by weight. 2. The viscosity average molecular weight of the entire aromatic polycarbonate resin containing the components (A) and (B) is from 10,000 to 40,0.
2. The polycarbonate resin composition according to the above 1, which is 00. 3. (A) The proportion of the polyorganosiloxane in the component is
3. The polycarbonate resin composition according to the above 1 or 2, which is 0.1 to 2.0% by weight of the aromatic polycarbonate resin containing the components (A) and (B). 4. The polycarbonate resin composition according to any one of the above items 1 to 3, wherein the proportion of the component (B) is at least 10% by weight of the whole aromatic polycarbonate resin containing the components (A) and (B). 5. The polycarbonate resin composition according to any one of the above items 1 to 4, wherein in the formula (2), R ² is a branched alkyl group having 10 to 20 carbon atoms. 6. An OA equipment housing using the polycarbonate resin composition according to any one of the above 1 to 5.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. First, the component (A) constituting the resin composition of the present invention is an aromatic polycarbonate-polyorganosiloxane copolymer having a terminal group represented by the formula (1) (hereinafter referred to as PC-PDMS copolymer). Abbreviated). For example, JP-A-50-29695, JP-A-3-29
2359, JP-A-4-202465, JP-A-8-81620, JP-A-8-302178, and copolymers disclosed in JP-A-10-7897 can be mentioned, and are preferred. Is a copolymer having in its molecule an aromatic polycarbonate part composed of a structural unit represented by the following structural formula (3) and a polyorganosiloxane part composed of a structural unit represented by the following structural formula (4). Can be.

[0012]

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Here, R ³ and R ⁴ represent an alkyl group having 1 to 6 carbon atoms or a phenyl group, which may be the same or different. R ^{5 to} R ^{8 each} represent an alkyl group having 1 to 6 carbon atoms or a phenyl group, preferably a methyl group. R ^{5 to} R
⁸ may be the same or different.

R ⁹ represents an organic residue containing an aliphatic or aromatic group, preferably an o-allylphenol residue, p
-A hydroxystyrene residue or an eugenol residue. Z is a single bond, an alkylene group or an alkylidene group having 1 to 20 carbon atoms having 1 to 20 carbon atoms, cycloalkylidene group cycloalkylene group or 5 to 20 carbon atoms 5 to 20 carbon atoms or -SO _2, -, - SO-, -S-, -O
-Represents a -CO- bond. Preferably, it is an isopropylidene group.

B and c are integers of 0 to 4, preferably 0. n is an integer of 1 to 500, preferably 5 to 100
It is. The PC-PDMS copolymer includes, for example, an aromatic polycarbonate oligomer (hereinafter, abbreviated as PC oligomer) constituting an aromatic polycarbonate portion prepared in advance, and o-allyl at an end constituting a polyorganosiloxane portion. Polyorganosiloxane (reactive PDMS) having a reactive group such as phenol group, p-hydroxystyrene group and eugenol residue is reacted with methylene chloride,
Dissolve in a solvent such as chlorobenzene or chloroform, add a caustic aqueous solution of dihydric phenol, and use a tertiary amine (such as triethylamine) or a quaternary ammonium salt (such as trimethylbenzylammonium chloride) as a catalyst. (5)

[0016]

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(In the formula, R ¹ and a are the same as described above.)
Can be produced by an interfacial polycondensation reaction in the presence of a general terminal stopper comprising a phenol compound represented by the formula:

As the above-mentioned terminal stopper, specifically,
For example, phenol, p-cresol, p-tert-
Butylphenol, p-tert-octylphenol, p-cumylphenol, p-nonylphenol, p
-Tert-amylphenol, bromophenol, tribromophenol, pentabromophenol and the like. Among them, compounds containing no halogen are preferable from the viewpoint of environmental problems. The PC oligomer used for the production of the PC-PDMS copolymer can be prepared by, for example, using a compound represented by the general formula (6)

[0019]

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Wherein R ³ , R ⁴ , Z, b and c are as defined above, and a carbonate precursor such as phosgene or a carbonate compound. Can be easily manufactured. That is, for example, it is produced by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride, or by transesterifying a dihydric phenol with a carbonate precursor such as diphenyl carbonate. You.

The dihydric phenol represented by the general formula (6) includes 4,4'-dihydroxydiphenyl;
1-bis (4-hydroxyphenyl) methane, 1,1-
Bis (4-hydroxyphenyl) alkanes such as bis (4-hydroxyphenyl) ethane and 2,2-bis (4-hydroxyphenyl) propane; bis (4-hydroxyphenyl) cycloalkane; bis (4-hydroxyphenyl) oxide Bis (4-hydroxyphenyl) sulfide; bis (4-hydroxyphenyl) sulfone; bis (4-hydroxyphenyl) sulfoxide;
Hydroxyphenyl) ether; bis (4-hydroxyphenyl) ketone, and the like. Among them, 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is preferable. These dihydric phenols may be used alone or in combination of two or more.

Examples of the carbonate compound include diaryl carbonates such as diphenyl carbonate and dialkyl carbonates such as dimethyl carbonate and diethyl carbonate.

In the present invention, the PC oligomer used in the production of the PC-PDMS copolymer may be a homopolymer using one of the above-mentioned dihydric phenols, or a copolymer using two or more of the above-mentioned dihydric phenols. You may. Further, it may be a thermoplastic random branched polycarbonate obtained by using a polyfunctional aromatic compound in combination with the dihydric phenol. In that case, as a branching agent (polyfunctional aromatic compound), 1,1,1-tris (4-hydroxyphenyl)
Ethane, α, α ′, α ″ -tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene, 1-
[Α-methyl-α- (4′-hydroxyphenyl) ethyl] -4- [α ′, α′-bis (4 ″ -hydroxylphenyl) ethyl] benzene, phloroglucin, trimellitic acid, isatin bis (o-cresol) Etc. can be used.

The component (A) can be produced by the above method. Generally, an aromatic polycarbonate is produced as a by-product.
It is manufactured as an aromatic polycarbonate resin containing the component (A), and has a total viscosity average molecular weight of 10,000 to 40,
2,000 is preferred, and more preferably 12,000 to 3
It is 0000. The ratio of the polyorganosiloxane is 0.1% of the entire polycarbonate resin containing the component (A).
5 to 10% by weight.

The polymer produced by the above method has substantially one or both of the molecules having a terminal group represented by the above formula (1). Next, the component (B) constituting the resin composition of the present invention is an aromatic polycarbonate having a terminal group represented by the above formula (2) (hereinafter abbreviated as a terminal-modified polycarbonate), and its viscosity. The average molecular weight is preferably 10,000 to 40,000,
More preferably, it is 12,000 to 30,000.

In the above formula (2), R ² has 10 carbon atoms.
To 20 alkyl groups, which may be linear or branched. Further, it is preferable that the number of carbon atoms be large within the range. Specific examples include decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups. The position of the bond may be any of p-position, m-position and o-position, but is preferably p-position. This terminal-modified polycarbonate can be easily produced by reacting a dihydric phenol with a phosgene or carbonate compound.

That is, for example, by reacting a dihydric phenol with a carbonate precursor such as phosgene in a solvent such as methylene chloride in the presence of a catalyst such as triethylamine and a specific terminal stopper, or It is produced by a transesterification reaction with a carbonate precursor such as diphenyl carbonate.

Here, the dihydric phenol may be the same as or different from the compound represented by the above general formula (6). Further, a homopolymer using one kind of the above-mentioned dihydric phenols or a copolymer using two or more kinds of the above-mentioned dihydric phenols may be used. Further, it may be a thermoplastic random branched polycarbonate obtained by using a polyfunctional aromatic compound in combination with the dihydric phenol.

Examples of the carbonate compound include diaryl carbonates such as diphenyl carbonate and dialkyl carbonates such as dimethyl carbonate and diethyl carbonate.

As the terminal terminator, a phenol compound having a terminal group represented by the above formula (2) may be used. That is, the description of R ^{2 in} the phenol compound represented by the following general formula (7) is the same as described above.

[0031]

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The aromatic polycarbonate produced by the above method has a terminal group represented by the above formula (2) at substantially one or both ends of the molecule. The aromatic polycarbonate resin containing the components (A) and (B) can be obtained by blending the aromatic polycarbonate resin containing the component (A) with the component (B). You may mix. In that case, the viscosity average molecular weight of the newly blended aromatic polycarbonate resin is 10,000 to 40,
000 is preferable, and 12,000 is more preferable.
0 to 30,000. The aromatic polycarbonate resin may be produced in the same manner as the component (B), using a generally used phenol compound of the general formula (5) as a terminal stopper. In this case, the dihydric phenol may be the same as or different from the one used in the production of the component (A) and the one of the general formula (6) used in the production of the component (A).

The viscosity average molecular weight of the entire aromatic polycarbonate resin containing the components (A) and (B) is 10.0 or less.
00 to 40,000 is preferable, and 1 is more preferable.
2,000 to 30,000, particularly preferably 1
4,000-26,000. If the molecular weight is too low, the mechanical strength of the resin composition of the present invention may be poor, and if the molecular weight is too high, the fluidity of the resin composition of the present invention may be poor.

The above polyorganosiloxane content is
The range of 0.1 to 2.0% by weight of the entire aromatic polycarbonate resin containing the components (A) and (B) is preferable in view of the flame retardancy of the resin composition of the present invention. More preferably, 0.
2 to 1.5% by weight, particularly preferably 0.5 to 1.
3% by weight.

The amount of the polycarbonate as the component (B) is preferably at least 10% by weight, more preferably 30 to 90% by weight, and particularly preferably 30% by weight of the whole aromatic polycarbonate resin containing the components (A) and (B). Is 40 ~
80% by weight. If the amount is less than 10% by weight, the fluidity of the composition of the present invention may not be improved.

The component (C) constituting the resin composition of the present invention has an average molecular weight of 500,000 having a fibril-forming ability.
The above-mentioned polytetrafluoroethylene (hereinafter abbreviated as PTFE) is for imparting the effect of preventing the molten dripping,
High flame retardancy can be provided. The average molecular weight needs to be 500,000 or more, preferably 500,000 to 10,000,000, more preferably 1,000,000 to 10,000,000.

The amount of the component (C) is determined by comparing the components (A) and (B)
0.05 to 1.0 part by weight, preferably 0.1 to 1.0 part by weight, based on 100 parts by weight of the aromatic polycarbonate resin containing the component.
0.5 parts by weight. When the amount exceeds 1.0 part by weight, not only does the impact resistance and the appearance of the molded product have a bad influence, but also the discharge of the strand pulsates during the kneading and extrusion, and stable pellet production cannot be performed. On the other hand, if the amount is less than 0.05 part by weight, a sufficient effect of preventing the molten dripping cannot be obtained. In the preferred range, a suitable effect of preventing dripping of the melt can be obtained, and an excellent flame retardant product can be obtained.

Component (C), P having fibril-forming ability
The TFE is not particularly limited, but specifically, Teflon 6-J (trade name, manufactured by DuPont Fluorochemicals Co., Ltd.), Polyflon D-1 and Polyflon F-103 (trade name, manufactured by Daikin Industries, Ltd.), Argo Freon F5 (trade name, manufactured by Montefluos) and Polyflon MPA FA-
100 (trade name, manufactured by Daikin Industries, Ltd.) and the like. These PTFEs may be used in combination of two or more.

P having a fibril-forming ability as described above
TFE can be obtained, for example, by mixing tetrafluoroethylene in an aqueous solvent in the presence of sodium, potassium or ammonium peroxydisulfide at 1 to 100 psi (7 psi).
To 700 kPa) at a temperature of 0 to 200 ° C, preferably 20 to 100 ° C.

The resin composition of the present invention may further contain, if necessary, various inorganic fillers, additives, other synthetic resins, elastomers, etc. within a range not to impair the object of the present invention. [Hereinafter, these are abbreviated as component (D)].

First, examples of the inorganic filler to be blended for the purpose of increasing the mechanical strength, durability, or weight of the polycarbonate resin composition include glass fiber (GF), carbon fiber, glass beads, glass flake, carbon black, and the like. Examples include calcium sulfate, calcium carbonate, calcium silicate, titanium oxide, alumina, silica, asbestos, talc, clay, mica, and quartz powder. Examples of the additive include hindered phenol-based, phosphorus-based (phosphite-based, phosphate-based, etc.) and amine-based antioxidants, such as benzotriazole-based and benzophenone-based ultraviolet absorbers. Examples thereof include lubricants such as aliphatic carboxylic acid esters, paraffins, silicone oil, and polyethylene wax, release agents, antistatic agents, coloring agents, and the like.

Examples of other synthetic resins include polyethylene, polypropylene, polystyrene, AS resin (acrylonitrile-styrene copolymer), ABS resin (acrylonitrile-butadiene-styrene copolymer), and polymethyl methacrylate. Can be.
Examples of the elastomer include isobutylene-isoprene rubber, styrene-butadiene rubber, ethylene-propylene rubber, and acrylic elastomer.

The resin composition of the present invention can be obtained by mixing and kneading the above components with (D) if necessary. The compounding and kneading may be performed by a commonly used method, for example, a method using a ribbon blender, a drum tumbler, a Henschel mixer, a Banbury mixer, a single screw extruder, a twin screw extruder, a co-kneader, a multi-screw extruder, or the like. Can be performed.
The heating temperature during kneading is usually from 240 to 320.
It is selected in the range of ° C.

The polycarbonate resin composition thus obtained is required to have flame retardancy by applying various known molding methods, for example, injection molding, hollow molding, extrusion molding, compression molding, calendar molding, rotational molding and the like. OA equipment (for example, copiers, printers, etc.).

[0045]

EXAMPLES The present invention will be described more specifically with reference to Production Examples, Examples and Comparative Examples, but the present invention is not limited to these Examples. Production Example 1 [Production of PC oligomer] 60 kg of bisphenol A was added to 400 liters of a 5% by weight aqueous sodium hydroxide solution.
Was dissolved to prepare an aqueous sodium hydroxide solution of bisphenol A. Then, the sodium hydroxide aqueous solution of bisphenol A kept at room temperature was passed through an orifice plate at a flow rate of 138 liters / hour and methylene chloride at a flow rate of 69 liters / hour through a tubular reactor having an inner diameter of 10 mm and a length of 10 m. Phosgene was introduced into this
Blowing was performed at a flow rate of 0.7 kg / hour, and the reaction was continuously performed for 3 hours. The tubular reactor used here was a double tube, and the outlet temperature of the reaction solution was kept at 25 ° C. by passing cooling water through the jacket. The pH of the discharged liquid is 10 to 11
It was adjusted to be.

The reaction solution thus obtained was allowed to stand, whereby the aqueous phase was separated and removed, and the methylene chloride phase (2
20 liters) were collected and the PC oligomer (concentration 31
7 g / l). The degree of polymerization of the PC oligomer obtained here was 2 to 4, and the concentration of the chloroformate group was 0.7 normal.

Production Example 2-1 [Production of reactive PDMS-A] 1,483 g of octamethylcyclotetrasiloxane, 96 g of 1,1,3,3
-Tetramethyldisiloxane and 35 g of 86% sulfuric acid were mixed and stirred at room temperature for 17 hours. Thereafter, the oil phase was separated, 25 g of sodium hydrogen carbonate was added, and the mixture was stirred for 1 hour. After filtration, 150 ° C., 3 torr (4 × 10 ²
Vacuum distillation was performed at Pa) to remove low-boiling substances to obtain an oil.

60 g of 2-allylphenol and 0.00
To a mixture of 14 g of platinum as a platinum chloride-alcoholate complex with 294 g of the oil obtained above at 90 ° C.
At a temperature of. The mixture was stirred for 3 hours while maintaining the temperature at 90-115 ° C. The product was extracted with methylene chloride and washed three times with 80% aqueous methanol to remove excess 2-allylphenol. The product was dried over anhydrous sodium sulphate and evaporated in vacuo to a temperature of 115 ° C. The obtained terminal phenol PDMS was NM
As a result of the measurement of R, the number of repeating dimethylsilanooxy units was 30.

Production Example 2-2 [Production of reactive PDMS-B]
The procedure was performed in the same manner as in Production Example 2-1 except that 60 g of 2-allylphenol was changed to 73.4 g of eugenol. The obtained terminal phenol PDMS showed that the number of repeating dimethylsilanooxy units was 30 by NMR measurement.
Met.

Production Example 2-3 Production of Reactive PDMS-C
The amount of 1,1,3,3-tetramethyldisiloxane is 1
Except having changed to 8.1 g, it carried out similarly to manufacture example 2-1. The obtained terminal phenol PDMS showed that the number of repeating dimethylsilanooxy units was 15 by NMR measurement.
It was 0.

[0051] Production Example 3-1 [PC-PDMS copolymer A ₁ of Production] methylene chloride reactive PDMS-A138g obtained in Production Example 2-1 2
Then, 10 liters of the PC oligomer obtained in Production Example 1 was mixed. Thereto, 26 g of sodium hydroxide dissolved in 1 liter of water and 5.7 cc of triethylamine were added, and the mixture was stirred and reacted at 500 rpm for 1 hour at room temperature.

After completion of the reaction, 5.2% by weight was added to the above reaction system.
A solution of 600 g of bisphenol A in 5 liters of aqueous sodium hydroxide solution, 8 liters of methylene chloride and 96 g of p-tert-butylphenol were added.
The mixture was stirred and reacted at 00 rpm at room temperature for 2 hours.

After the reaction, 5 l of methylene chloride was added,
Further, water washing with 5 liters of water, alkali washing with 5 liters of 0.03 N aqueous sodium hydroxide solution, acid washing with 5 liters of 0.2 N hydrochloric acid, and water washing twice with 5 liters of water are successively performed. removed to obtain a flaky PC-PDMS copolymer a _1. PC-P obtained
DMS copolymer A was vacuum dried at 120 ° C. for 24 hours.
The viscosity average molecular weight was 17,000, and the PDMS content was 3.0% by weight. In addition, viscosity average molecular weight, PD
The PS content was determined as follows.

(1) Viscosity average molecular weight (Mv) The viscosity of the methylene chloride solution at 20 ° C. was measured with an Ubbelohde viscometer, and the intrinsic viscosity [η] was determined from this. [Η] = 1.23 × 10 ⁻⁵ Mv ^0.83 (2) PDMS content peak of methyl group of isopropyl of bisphenol A observed at 1.7 ppm in ¹ H-NMR and 0.2 ppm
Was determined on the basis of the intensity ratio with the peak of the methyl group of dimethylsiloxane, which was observed in (1).

[0055] Production Example 3-2 [Production PC-PDMS copolymer A _2] Production Example 3-1, the reactive PDMS-A138g reactive PDMS
-B 91 g, p-tert-butylphenol 9
Except that 6 g was changed to 136 g of p-cumylphenol, flake PC-PDMS was prepared in the same manner as in Production Example 3-1.
A copolymer was obtained. The viscosity average molecular weight was 16,800, and the PDMS content was 2.0% by weight.

[0056] Production Example 3-3 [Production PC-PDMS copolymer A _3] in Production Example 3-1, except for changing the reactive PDMS-A to the reactive PDMS-C is that of Preparation 3-1 Similarly, flake-shaped P
A C-PDMS copolymer was obtained. The viscosity average molecular weight is 17,
It was 200 and the PDMS content was 3.0% by weight.

[0057] Production Example 4-1 [Production of modified polycarbonate B _1] to a stirred container with a 50-liter, put PC oligomer 10 l obtained in Production Example 1, dissolved in p-n-dodecylphenol 162g I let it. Next, an aqueous sodium hydroxide solution (53 g of sodium hydroxide, 1 liter of water) and 5.8 cc of triethylamine were added, and the mixture was reacted by stirring at 300 rpm for 1 hour. Thereafter, a sodium hydroxide solution of bisphenol A (bisphenol: 720) was added to the above system.
g, sodium hydroxide 412 g, and water 5.5 liters), and 8 liters of methylene chloride was added thereto.
The reaction was performed by stirring at rpm. After the reaction, methylene chloride 7
Liter and 5 liters of water and add 500 rpm for 10 minutes
After stirring was stopped, the mixture was allowed to stand, and the organic phase and the aqueous phase were separated. The organic phase obtained was treated with 5 liters of alkali (0.03
(Normal-NaOH), 5 liters of acid (0.2N-hydrochloric acid) and 5 liters of water (twice). Thereafter, the methylene chloride was evaporated to obtain a flaky polymer. The viscosity average molecular weight was 17,500.

[0058] Production Example 4-2 [Production of modified polycarbonate B _2] Production Example 4-1
162 g of pn-dodecylphenol
Production Example 4 except that 136 g of n-nonylphenol was used.
In the same manner as in -1, a flaky polymer was obtained. The viscosity average molecular weight was 17,400.

[0059] Production Example 4-3 [Production of modified polycarbonate B _3] Production Example 4-1
162 g of pn-dodecylphenol
Production Example 4 except for changing to 162 g of dodecylphenol (manufactured by Yuka Schenectady, having a branched dodecyl group)
A flake polymer was obtained in the same manner as in Example 1. The viscosity average molecular weight was 17,500.

Examples 1 to 6 and Comparative Examples 1 to 4 PC-PDMS copolymers A _{1 to} A ₃ obtained in Production Examples,
The terminal-modified polycarbonates B _{1 to} B ₃ , commercially available polycarbonate and PTFE were blended at the blending ratios shown in Table 1, and a vented twin-screw extruder [TEM, manufactured by Toshiba Machine Co., Ltd.
-35B], and kneaded at a temperature of 280 ° C to form pellets. Teflon FN1700A manufactured by Idemitsu Petrochemical Co., Ltd. (viscosity average molecular weight: 17,
200) and Algoflon F5 from Montefluos was used as PTFE.

In Examples 1, 4 and Comparative Example 1, PEP36 [bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol manufactured by Asahi Denka Kogyo KK was used as an antioxidant. -Di-phosphite].
05 parts by weight. The resulting pellets were each 120
After drying with hot air at 5 ° C for 5 hours, Toshiba Machine Co., Ltd.
Using 100EN (injection molding machine), a test piece for measurement was molded at a molding temperature of 280 ° C and a mold temperature of 80 ° C. About the test piece, flammability in the following way,
Izod impact strength and spiral flow length (SF
L) was measured. Table 2 shows the results.

(1) Flammability UL94 standard. 1.5mm thick. A vertical burn test was performed according to Underwriters Laboratory Subject 94. (2) Izod impact strength Measured according to JIS K 7110. Five tests were performed, and the average value was shown. (3) SFL injection pressure 80 Kg / m ² (784 Pa), molding temperature 280
C., a mold temperature of 80 ° C., and a thickness of 2 mm.

[0063]

[Table 1]

[0064]

[Table 2]

From Table 2, it can be seen that the examples have better fluidity and impact resistance than the comparative examples.

[0066]

According to the present invention, a polycarbonate resin composition having excellent fluidity, impact resistance and flame retardancy can be provided. Therefore, the resin composition obtained by the present invention is suitably used in, for example, OA equipment, electric / electronic fields, and the like.

Claims (6)

[Claims] [Claim 1] The following formula (1) (Wherein, R ¹ is an alkyl group having 1 to 9 carbon atoms, 6 to 9 carbon atoms)
20 represents an aryl group or a halogen atom, and a represents 0 to 5
Indicates an integer. Aromatic polycarbonate-polyorganosiloxane copolymer having a terminal group represented by formula (A):
And the following formula (2): (Wherein, R ² is an alkyl group having 10 to 20 carbon atoms) based on 100 parts by weight of an aromatic polycarbonate resin containing an aromatic polycarbonate (B) having a terminal group represented by the following formula:
A polycarbonate resin composition comprising 0.05 to 1 part by weight of polytetrafluoroethylene (C) having an average molecular weight of 500,000 or more and capable of forming fibrils. 2. The viscosity average molecular weight of the entire aromatic polycarbonate resin containing the components (A) and (B) is 10,000.
The polycarbonate resin composition according to claim 1, which has a molecular weight of up to 40,000. 3. The composition according to claim 1, wherein the proportion of the polyorganosiloxane in the component (A) is 0.1 to 2.0% by weight of the aromatic polycarbonate resin containing the components (A) and (B). The polycarbonate resin composition according to the above. 4. The method according to claim 1, wherein the proportion of the component (B) is (A) or (B).
The polycarbonate resin composition according to any one of claims 1 to 3, which accounts for at least 10% by weight of the entire aromatic polycarbonate resin containing the component. 5. In the above formula (2), R ² has 1 carbon atom.
The polycarbonate resin composition according to any one of claims 1 to 4, which has 0 to 20 branched alkyl groups. 6. An OA equipment housing using the polycarbonate resin composition according to claim 1.