JP3037588B2 - Polycarbonate resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polycarbonate resin composition. More specifically, the present invention relates to a polycarbonate resin composition having excellent heat stability, fluidity and flame retardancy.

[0002]

2. Description of the Related Art Polycarbonate resins have high mechanical strength (particularly impact resistance),
It has excellent electrical properties and transparency, and is widely used as an engineering plastic in various fields such as OA equipment, electric and electronic equipment, and automobiles. Among these fields of use, there are fields where flame retardancy is required, mainly in the fields of OA equipment and electric / electronic equipment. The polycarbonate resin has a high oxygen index among various thermoplastic resins, and is generally referred to as a resin having self-extinguishing properties. However, the level of flame retardancy required in the OA equipment and electric / electronic equipment fields is generally UL9.
In order to impart high flame retardancy to V-0 level in four standards, it is usually carried out by adding a flame retardant and a flame retardant auxiliary.

[0003] On the other hand, it is known that a polycarbonate-polyorganosiloxane copolymer or a mixture of a polycarbonate-polyorganosiloxane copolymer and a polycarbonate resin generally exhibits higher flame retardancy than a polycarbonate resin. However, since the flame retardancy of the polycarbonate-polyorganosiloxane copolymer alone is insufficient, compositions using various flame retardants are disclosed. (For example, JP-A-63-289059, JP-A-1-210462, JP-A-3-200
862, JP-A-4-202465, etc.).
However, the technique disclosed herein has a disadvantage that when the polycarbonate resin is made to be highly fluidized, melt dripping occurs during combustion. Further, a system to which a flame retardant and a bromine compound are added generally has a disadvantage that heat stability is inferior.

[0004]

Means for Solving the Problems Accordingly, the present inventors have:
In view of the above situation, intensive studies have been made to develop a polycarbonate resin composition having excellent thermal stability and high fluidity. As a result, a mixture of a polycarbonate-polyorganosiloxane copolymer or a polycarbonate-polyorganosiloxane copolymer and a polycarbonate resin,
The ratio of the polyorganosiloxane part in the composition is 0.1 to 2.
At 0% by weight, the maximum oxygen index was found to develop,
Furthermore, it has been found that the combined use of polytetrafluoroethylene prevents melting and dropping during combustion and that a polycarbonate resin composition having the desired properties can be obtained. The present invention has been completed based on such findings. That is, the present invention provides (A) a polycarbonate-polyorganosiloxane copolymer, (B) a polycarbonate resin, and (C) an average molecular weight of 500,000 having fibril-forming ability.
Consisting of zero or more polytetrafluoroethylene, (A)
The component is 5 to 100% by weight of the total amount of the components (A) and (B), and the component (B) is 95 to 0% by weight of the total amount of the components (A) and (B). Is 0.1 to 0.1 of the total amount of the components (A) and (B).
2.0% by weight, wherein the component (C) is 0.05 to 1.0 part by weight based on 100 parts by weight of the total of the components (A) and (B). .

[0005] First, there are various polycarbonate-polyorganosiloxane copolymers (hereinafter abbreviated as PC-PDMS copolymers) as the component (A) constituting the resin composition of the present invention. Is the general formula (1)

[0006]

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Wherein R ¹ and R ² are each a halogen atom (for example, chlorine, fluorine, iodine) or an alkyl group having 1 to 8 carbon atoms (for example, methyl, ethyl, propyl, isopropyl, Various butyl groups (n-butyl group, isobutyl group, sec-butyl group, tert-butyl group), various pentyl groups, various hexyl groups, various heptyl groups, various octyl groups. m and n are each 0
Is an integer of from 4 to 4, when m is 2 to 4, R ¹ may be the same or different, and when n is 2 to 4, R ² may be the same or different May be.
Z is an alkylene group having 1 to 8 carbon atoms or an alkylidene group having 2 to 8 carbon atoms (for example, a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group, a hexylene group, an ethylidene group, an isopropylidene group, etc.) A cycloalkylene group having 5 to 15 carbon atoms or a cycloalkylidene group having 5 to 15 carbon atoms (for example, a cyclopentylene group, a cyclohexylene group, a cyclopentylidene group, a cyclohexylidene group, or the like);
_2- , -SO-, -S-, -O-, -CO- bond or formula (2) or formula (2 ')

[0008]

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[0009] The bond represented by And a polycarbonate unit having a repeating unit having a structure represented by the following general formula (3):

[0010]

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[Wherein R ³ , R ⁴ and R ⁵ are each a hydrogen atom, an alkyl group having 1 to 5 carbon atoms (eg, methyl, ethyl, propyl, n-butyl, isobutyl, etc.) Or p is a phenyl group, and p and q are each an integer of 0 or 1 or more. And a polyorganosiloxane part having a repeating unit having a structure represented by the following formula: Here, the degree of polymerization of the polycarbonate part is 3 to
100 is preferable, and the polymerization degree of the polyorganosiloxane portion is preferably 2 to 500.

The above-mentioned PC-PDMS copolymer comprises a polycarbonate part having a repeating unit represented by the general formula (1) and a polyorganosiloxane part having a repeating unit represented by the general formula (3). And a viscosity average molecular weight of 10,000 to 4,000.
0, preferably 12,000 to 35,000.
Such a PC-PDMS copolymer includes, for example, a polycarbonate oligomer (hereinafter, abbreviated as a PC oligomer) constituting a polycarbonate portion manufactured in advance.
A polyorganosiloxane having a reactive group at a terminal constituting the polyorganosiloxane portion (for example, polydimethylsiloxane (PDMS), polydialkylsiloxane such as polydiethylsiloxane, or polymethylphenylsiloxane) is mixed with methylene chloride, chlorobenzene,
It can be produced by dissolving in a solvent such as chloroform, adding an aqueous sodium hydroxide solution of bisphenol, and performing an interfacial polycondensation reaction using triethylamine or trimethylbenzylammonium chloride as a catalyst. Further, a PC-PDMS copolymer produced by the method described in JP-B-44-30105 or the method described in JP-B-45-20510 can also be used.

Here, the PC oligomer having a repeating unit represented by the general formula (1) can be prepared by a solvent method, that is, in a solvent such as methylene chloride in the presence of a known acid acceptor and a molecular weight regulator, the general formula (I) 4)

[0014]

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Wherein R ¹ , R ² , Z, m and n are as defined above, and a carbonate precursor such as phosgene or a carbonate compound. Can be easily manufactured. 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 known acid acceptor or a molecular weight regulator, or as in the case of dihydric phenol and diphenyl carbonate. It is produced by a transesterification reaction with a suitable carbonate precursor.

As the dihydric phenol represented by the general formula (4), there are various ones, and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A) is particularly preferable. Examples of the dihydric phenol other than bisphenol A include bis (4-hydroxyphenyl) alkane other than bisphenol A; 1,1- (4-hydroxyphenyl) methane; 1,1- (4-hydroxyphenyl)
Ethane; 4,4'-dihydroxydiphenyl; bis (4
-(Hydroxyphenyl) cycloalkane; bis (4-hydroxyphenyl) oxide; bis (4-hydroxyphenyl) sulfide; bis (4-hydroxyphenyl)
Sulfone; bis (4-hydroxyphenyl) sulfoxide; bis (4-hydroxyphenyl) ether; bis (4-hydroxyphenyl) ketone.
In addition, examples of the dihydric phenol include hydroquinone. 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. And as a molecular weight regulator, what is normally used for polymerization of polycarbonate may be used, and various types can be used. Specifically, as the monohydric phenol, for example, phenol, p-
Cresol, p-tert-butylphenol, p-tert-
Octyl phenol, p-cumyl phenol, nonyl phenol and the like can be mentioned. In the present invention, PC-P
The PC oligomer used for the production of the DMS 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. Further, it may be a thermoplastic random branched polycarbonate obtained by using a polyfunctional aromatic compound in combination with the dihydric phenol.

The polycarbonate resin (B) constituting the polycarbonate resin composition is not particularly limited, but can be easily produced by reacting a dihydric phenol with phosgene or a 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 known acid acceptor or a molecular weight regulator, or as in the case of dihydric phenol and diphenyl carbonate. It is produced by a transesterification reaction with a suitable carbonate precursor. Here, the dihydric phenol may be the same as or different from the compound represented by the general formula (4). Further, a homopolymer using one kind of the dihydric phenol or a copolymer using two or more kinds of the 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 described above, the molecular weight regulator may be any of those generally used for the polymerization of polycarbonate, and various types can be used. Specifically, as the monohydric phenol, for example, phenol, p-
Cresol, p-tert-butylphenol p-tert-
Octyl phenol, p-cumyl phenol, nonyl phenol and the like can be mentioned.

The mixing ratio of the component (A) and the component (B)
Component (A) is 5 to 100% by weight, preferably 10 to 100% by weight, based on the total amount of component (A) and component (B),
Component (B) is 95 to 0% by weight, preferably 90 to 0% by weight. If the amount of the component (A) is less than 5% by weight and the amount of the component (B) exceeds 95% by weight, the dispersibility of the polyorganosiloxane will deteriorate, and sufficient flame retardancy will not be obtained. On the other hand, when the component (A) and the component (B) are in the preferable ranges, those having good flame retardancy can be obtained. The ratio of the polyorganosiloxane part in the component (A) is 0.1 to 2.0% by weight, preferably 0.5 to 1.0% by weight based on the total amount of the components (A) and (B).
5% by weight. If it is less than 0.1% by weight or more than 2.0% by weight, a sufficient oxygen index cannot be obtained, and the desired flame retardancy cannot be obtained. In the preferred range, a more suitable oxygen index is obtained, and a material having excellent flame retardancy is obtained.

The polytetrafluoroethylene (hereinafter abbreviated as PTFE), which is the component (C) of the present invention, has an effect of preventing melting and dripping. If a material having a fibril-forming ability is used, high flame retardancy is obtained. Can be provided. It is necessary that the average molecular weight be at least 500,000, preferably 500,000 to 100,000,000, and more preferably 1,000,000 to 10,000,000. The component (C) has a total of 10 components (A) and (B).
0.05 to 1.0 part by weight, preferably 0.1 part by weight with respect to 0 part by weight.
0.5 part by weight. If this amount exceeds 1.0 parts by weight,
In addition to adversely affecting impact resistance and molded product appearance,
The discharge of the strands pulsates during kneading and extrusion, and stable pellet production cannot be performed, which is not preferable. 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.

The PTFE having the ability to form fibrils, which is the component (C) of the resin composition of the present invention, is not particularly limited. For example, those classified into type 3 according to the ASTM standard can be used. Specific examples of this type include Teflon 6-J (trade name, manufactured by Du Pont-Mitsui Fluorochemicals) and Polyflon D
-1 and Polyflon F-103 (trade name, manufactured by Daikin Industries, Ltd.). Other than type 3, examples include Algoflon F5 (trade name, manufactured by Montefluos) and Polyflon MPA FA-100 (trade name, manufactured by Daikin Industries, Ltd.). These PTFEs may be used in combination of two or more. PTFE having a fibril-forming ability as described above can be prepared, for example, by mixing tetrafluoroethylene in an aqueous solvent in the presence of sodium, potassium or ammonium peroxydisulfide in the range of 1 to 100.
Under a pressure of psi, a temperature of 0-200 ° C, preferably 20-1
It can be obtained by polymerizing at 00 ° C.

The resin composition of the present invention may contain, if necessary, various inorganic fillers, additives, or other synthetic resins, in addition to the components (A), (B) and (C). Elastomers and the like can be blended as long as the object of the present invention is not hindered [these are abbreviated as component (D)]. First, as the inorganic filler compounded for the purpose of increasing the mechanical strength, durability or weight of the polycarbonate resin composition, for example, glass fiber (GF), carbon fiber, glass beads, glass flake, carbon black, calcium sulfate, Examples include calcium carbonate, calcium silicate, titanium oxide, alumina, silica, asbestos, talc, clay, mica, and quartz powder. Also,
As the additives, for example, hindered phenol-based, phosphorus-based (phosphite-based, phosphate-based, etc.), amine-based antioxidants, for example, benzotriazole-based, benzophenone-based ultraviolet absorbers, for example, Examples thereof include an external lubricant such as an aliphatic carboxylic acid ester type, a paraffin type, a silicone oil, and a polyethylene wax, a release agent, an antistatic agent, and a coloring agent. Other synthetic resins include polyethylene, polypropylene, polystyrene,
AS resin (acrylonitrile-styrene copolymer), A
Examples of each resin include a BS resin (acrylonitrile-butadiene-styrene copolymer) and polymethyl methacrylate. Further, as the elastomer, isobutylene-isoprene rubber, styrene-butadiene rubber,
Ethylene-propylene rubber, acrylic elastomer and the like can be mentioned.

The resin composition of the present invention can be obtained by blending and kneading the above components (A), (B) and (C) 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 Henschel mixer, a Banbury mixer, a drum tumbler, a single screw extruder, a twin screw extruder, a co-kneader, a multi-screw extruder and the like. Can be performed. In addition, the heating temperature at the time of kneading is usually selected in the range of 240 to 320 ° C. The polycarbonate resin composition thus obtained is
Various known molding methods, such as injection molding, blow molding,
By applying extrusion molding, compression molding, calendar molding, rotational molding and the like, it can be used to produce molded articles such as chassis of OA equipment or molded articles in the electric and electronic fields.

[0025]

EXAMPLES The present invention will be described in more detail with reference to Production Examples, Examples and Comparative Examples.

Production Example 1 [Production of PC oligomer A] 400 liters, 5% by weight
60 kg of bisphenol A was dissolved in an aqueous sodium hydroxide solution 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. Then, phosgene was fed into the reactor at a flow rate of 10.7 kg / hour and reacted continuously 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, and the aqueous phase was separated and removed. A methylene chloride phase (220 liters) was collected. 170 liters of methylene chloride was further added thereto, followed by sufficient stirring. This was designated as PC oligomer A (concentration: 317 g / liter). The degree of polymerization of the PC oligomer A obtained here is 3-4.
Met.

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 is separated and 2
5 g of sodium bicarbonate was added and stirred for 1 hour. After filtration, vacuum distillation was performed at 150 ° C. and 3 torr to remove low-boiling substances to obtain an oil. 60 g of 2-allylphenol and 0.0
To a mixture with 014 g of platinum as a platinum chloride-alcoholate complex was added 294 g of the oil obtained above in 90 g.
Added at a temperature of ° C. 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 resulting terminal phenol PDMS is N
As a result of MR measurement, 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 the amount of 1,1,3,3-tetramethyldisiloxane was changed to 18.1 g. The number of repeating dimethylsilanooxy units of the obtained terminal phenol PDMS was 150 as measured by NMR.

[0029] Production Example 3-1 [PC-PDMS copolymer A ₁ of Production] methylene chloride reactive PDMS-A185g obtained in Production Example 2-1 2
Of the PC oligomer obtained in Production Example 1 and mixed. There, sodium hydroxide 2
A solution of 6 g in 1 liter of water and 5.7 cc of triethylamine were added, and the mixture was stirred and reacted at 500 rpm at room temperature for 1 hour. After the completion of the reaction, a solution prepared by dissolving 600 g of bisphenol A in 5 liters of a 5.2% by weight aqueous sodium hydroxide solution, 8 liters of methylene chloride and 81 g of p-tert-butylphenol were added to the reaction system.
The mixture was stirred and reacted at 0 rpm at room temperature for 1 hour. After the reaction,
5 liters of methylene chloride was added, followed by water washing with 5 liters of water, alkali washing with 5 liters of 0.01N sodium hydroxide aqueous solution, acid washing with 5 liters of 0.1N hydrochloric acid, and water washing with 5 liters of water in that order. Finally, methylene chloride was removed to obtain a chip-shaped PC-PDMS copolymer.

[0030] Production Example 3-2 [Production PC-PDMS copolymer A _2] Production Example 3-1, 113 g of p-tert-butylphenol 81g
A PC-PDMS copolymer in the form of a chip was obtained in the same manner as in Production Example 3-1 except that the above was changed to.

[0031] In Production Example 3-3 [Production PC-PDMS copolymer A _3] Production Example 3-1, changing the reactive PDMS-A185g to 42 g,
Except that 81 g of p-tert-butylphenol was changed to 113 g, a chip-shaped PC-P was produced in the same manner as in Production Example 3-1.
A DMS copolymer was obtained.

[0032] In Production Example 3-4 [Production PC-PDMS copolymer A _4] Production Example 3-1, changing the reactive PDMS-A reactive PDMS-B, a p-tert-butylphenol 81g to 113g Except for the change, a chip-shaped PC was manufactured in the same manner as in Production Example 3-1.
-A PDMS copolymer was obtained.

PC-P obtained in Production Examples 3-1 to 3-4
Each of the DMS copolymers A _{1 to} A ₄ was dried at 120 ° C. for 24 hours, and then pelletized by an extruder at 280 ° C. For each of them, PDMS chain length, PDMS content, and viscosity average molecular weight were measured as physical properties evaluation. The measuring method is shown below, and the results are shown in Table 1. (1) PDMS chain length (n: dimethylsilanooxane unit) The peak of the methyl group of dimethylsiloxane found at 0.2 ppm in ¹ H-NMR, and the PC- found at 2.6 ppm.
It was determined from the intensity ratio with the peak of the methylene group at the PDMS binding site. (2) Bisphenol A found at 1.7 ppm in PDMS content ¹ H-NMR
From the peak of the methyl group of isopropyl and the peak of the methyl group of dimethylsiloxane found at 0.2 ppm. (3) 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

[0034]

[Table 1]

Examples 1 to 4 and Comparative Examples 1 to 6 PC-PDMS copolymers A _{1 to} A ₄ obtained in Production Examples 3-1 to _3-4 and commercially available polycarbonate resin, PTF
E. Cryolite (Na ₃ AlF ₆ ), which is an alkali metal salt, was blended at the blending ratio shown in Table 2 and a vented twin-screw extruder [TEM-35B, manufactured by Toshiba Machine Co., Ltd.] was used. The mixture was kneaded at ℃ and pelletized. In addition, each raw material used is as follows. (A) Polycarbonate resin B ₁ : Tafflon A2200 [Made by Idemitsu Petrochemical Co., Ltd.
v = 21,000] B ₂ : Toughlon A1500 [Made by Idemitsu Petrochemical Co., Ltd., M
v = 15,000] (B) PTFE C ₁ : Algoflon F5 [manufactured by Montefluos] with fibril-forming ability C ₂ : Rubron L5 [manufactured by Daikin Industries, Ltd.] no fibril-forming ability (C) Polydimethylsiloxane D ₁ : SH200 [manufactured by Toray Dow Corning Silicone Co., Ltd.] (D) Cryolite E ₁ : Na ₃ AlF ₆ [manufactured by Aldrich Chemical Co., Ltd.]

[0036]

[Table 2]

[0037]

[Table 3]

Each of the obtained pellets was dried with hot air at 120 ° C. for 5 hours, and then IS100EN manufactured by Toshiba Machine Co., Ltd.
(Injection molding machine), molding temperature of 280 ° C, 80 ° C
Of a combustion test bar at the mold temperature of Sumitomo Heavy Industries, Ltd.
Manufactured by Sumitomo Nestal N515 / 150
140mm × 14 at a molding temperature of 80 ° C and a mold temperature of 80 ° C
A flat plate for evaluating the surface appearance and long-term heat resistance of 0 mm × 3.2 mm was prepared. As performance evaluations of the obtained pellets and molded articles, the oxygen index, flame retardancy, surface appearance, long-term heat resistance, and flow value were measured. The measuring method is shown below, and the results are shown in Table 3. (1) Oxygen index Measured according to JIS K7201. Ignition approaching from above in a combustion tube with varying oxygen / nitrogen ratio,
The minimum value of oxygen / nitrogen burning continuously for 3 minutes or more was determined. (2) Flame retardancy UL94 standard. 1.5mm and 1.0mm thick. A vertical burn test was performed according to Underwriters Laboratory Subject 94. (3) Flow value Measured at a measurement temperature of 280 ° C. and a load of 160 kg according to JIS K 7201. (4) Surface appearance 140 mm x 140 mm x molded at a molding temperature of 300 ° C
A 3.2 mm flat plate was visually observed to evaluate the presence or absence of silver. (5) Long-term heat resistance 140 mm x 140 mm x molded at a molding temperature of 300 ° C
A 3.2 mm flat plate was prepared by using High Temp. O
ven PHH-200, left at 140 ° C for 1000 hours, and the color tone difference (ΔYI) from the initial (0 hour) molded product
Was measured. YI (yellowness) is based on JIS K 7105
It measured according to.

[0039]

[Table 4]

[0040]

[Table 5]

As shown in Table 3, the content of PDMS in the PC-PDMS copolymer and the polycarbonate resin was 0.1%.
Examples in which the content of PTFE is 0.05 to 1.0 part by weight show high flame retardancy. Examples 2 to
No. 4 is also excellent in fluidity. On the other hand, Comparative Examples 1 to 6 do not satisfy any of the requirements of the present invention, so that desired flame retardancy cannot be obtained. Comparative Example 1 has a low oxygen index and a thickness of 1.5 m.
Both m and 1.0 mm are disqualified from V-2. Comparative Example 2 is PT
Since it lacks FE, it does not have the effect of preventing molten dripping,
0 cannot be obtained. Comparative Example 3 is an example in which a polycarbonate resin and polydimethylsiloxane were mixed, but the oxygen index was low and flame retardancy was not obtained. It can be seen that the improvement of the oxygen index is recognized only when the PC-PDMS copolymer of the example is used. Comparative Examples 4 and 5 are PD
In each of these examples, the MS content is out of the range, but the improvement in the oxygen index is small, and the desired flame retardancy cannot be obtained. Comparative Example 6 is an example in which PTFE having no fibril-forming ability was used. However, melting dropping could not be prevented, and V-0 could not be obtained.
Comparative Example 7 is an example in which an alkali metal salt was added to Example 3 (see Japanese Patent Application Laid-Open No. 3-200862). Inferior in long-term heat resistance and intense color change.

[0042]

According to the present invention, a flame-retardant polycarbonate resin composition having excellent heat stability and excellent fluidity can be provided because it contains no flame retardant or bromine compound. Therefore, the resin composition obtained by the present invention,
For example, it is suitably used in OA equipment, electric and electronic fields, and the like.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 69/00

Claims (2)

(57) [Claims] An average molecular weight of (A) a polycarbonate-polyorganosiloxane copolymer, (B) a polycarbonate resin and (C) a fibril-forming ability.
Consisting of zero or more polytetrafluoroethylene, (A)
The component is 5 to 100% by weight of the total amount of the components (A) and ( B ), and the component ( B ) is 95 to 0% by weight of the total amount of the components (A) and ( B ). Is 0.1% of the total amount of the components (A) and (B).
A polycarbonate resin composition, wherein the amount of the component (C) is 0.05 to 1.0 part by weight based on 100 parts by weight of the total of the components (A) and (B). 2. The composition according to claim 1, wherein the proportion of the polyorganosiloxane component in component (A) is 0.5 to 1.5 of the total amount of component (A) and component (B).
The polycarbonate resin composition according to claim 1, wherein the content is 5% by weight.