JP2662310B2 - Polycarbonate-polydimethylsiloxane copolymer and method for producing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polycarbonate-polydimethylsiloxane copolymer and a method for producing the same, and more specifically, a novel polycarbonate-polydimethylsiloxane copolymer excellent in impact resistance, and a composition containing the same. The present invention relates to a product and an efficient manufacturing method thereof.

BACKGROUND ART Conventionally, glass fibers have been added to improve rigidity and dimensional stability of polycarbonate. However, when glass fiber is added, brittle fracture is likely to occur, and the Izod impact strength is reduced. Therefore, various polycarbonates having excellent impact resistance have been studied. For example, Japanese Patent Application Laid-Open No. 55-160052 discloses that a filler and an organopolysiloxane-polycarbonate block copolymer are blended with polycarbonate, but the impact resistance is not sufficiently improved even by this. .

In addition, Japanese Patent Publication No. 57-501860 proposes a composition comprising a polycarbonate mixed with a glass fiber containing no sizing agent and a siloxane. Further, Japanese Patent Publication No. 59-35929 proposes a composition comprising a polycarbonate mixed with glass fibers and an organopolysiloxane having a specific viscosity. However, molded articles obtained from these two compositions have a problem that insulation failure occurs.

DISCLOSURE OF THE INVENTION Accordingly, the present inventors have conducted intensive studies to solve the above problems, and as a result, by using a specific polydimethylsiloxane, a block copolymer with polycarbonate having excellent impact resistance was obtained. Was found to be. The present invention has been completed based on such findings.

That is, the present invention provides a compound represented by the general formula (I): [Wherein, R ¹ and R ² each independently represent hydrogen, carbon number 1 to 4
Wherein R ³ is hydrogen, halogen or carbon atom 1
R ⁴ represents hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms or an aryl group, and x represents 1 to 5
Y represents an integer of 1 to 4, and n represents 1 to 100.
Indicates an integer. And a general formula (II) Wherein R ⁵ and R ⁶ are each independently A group represented by A group represented by A group represented by And m represents an integer of 100 to 400. A copolymer comprising a polydimethylsiloxane block represented by the formula: wherein the proportion of the polydimethylsiloxane block portion in the copolymer is 0.5 to 10% by weight and the n-hexane soluble component of the copolymer is Is 1.0% by weight or less and a viscosity-average molecular weight of 10,000 to 50,000. Further, the present invention provides a compound represented by the general formula (III): Wherein R ¹ , R ² , R ₄ and y are the same as above. And an organic dihydroxy compound represented by the general formula (IV): Wherein R ⁵ , R ⁶ and m are the same as above. A method for producing the above-mentioned polycarbonate-polydimethylsiloxane copolymer, which comprises reacting a polydimethylsiloxane represented by the formula (I) with a carbonate-forming derivative in a liquid medium in the presence of a molecular weight modifier. is there. Furthermore, the present invention relates to a polycarbonate-polydimethylsiloxane copolymer of 40 to 90% by weight and an inorganic filler 60.
The present invention also provides a resin composition comprising 〜10% by weight.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows proton nuclear magnetic resonance ( ¹ H) of the polycarbonate-polydimethylsiloxane copolymer prepared in Example 2.
FIG. 2 is a graph showing the relationship between the number of dimethylsilanooxy units in the polydimethylsiloxane portion in the polycarbonate-polydimethylsiloxane copolymer used and the Izod impact strength of the molded article.

BEST MODE FOR CARRYING OUT THE INVENTION The polycarbonate-polydimethylsiloxane copolymer of the present invention comprises, as described above, a polycarbonate (hereinafter sometimes referred to as PC) block represented by the general formula (I) and a general formula (II) ) Is a block copolymer composed of polydimethylsiloxane (hereinafter, sometimes referred to as PDMS) blocks.

R ¹ and R ² in the general formulas (I) and (III) each independently represent hydrogen or an alkyl group having 1 to 4 carbon atoms, for example, a methyl group, an ethyl group, an n-propyl group, an i-propyl group, It represents n-butyl group, i-butyl group, s-butyl group and t-butyl group. R ³ and R ⁴ in the general formulas (I) and (III) are each independently hydrogen, halogen (eg, chlorine, fluorine, bromine, etc.), an alkyl group having 1 to 20 carbon atoms (eg, a methyl group) , Ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group, t-butyl group, n-octyl group, t-octyl group, n-decyl group, n -Octadecyl group, etc.) or aryl group (for example, phenyl group, benzyl group, α, α-dimethylbenzyl group, etc.).

As the organic dihydroxy compound represented by the general formula (III), there are various compounds, for example, bis (4-hydroxyphenyl) alkane, and more specifically, 2,2-bis (4-hydroxy Phenyl) propane [commonly known as bisphenol A]; bis (4-hydroxyphenyl) methane; 1,1-bis (4-hydroxyphenyl)
Ethane 1,1-bis (4-hydroxyphenyl) propane;
2,2-bis (4-hydroxyphenyl) butane; 2,2-bis (4-hydroxyphenyl) pentane; 2,2-bis (4
-Hydroxyphenyl) isopentane; 2,2-bis (4-
(Hydroxyphenyl) hexane; 2,2-bis (4-hydroxyphenyl) isohexane; 4,4-dihydroxytriphenylmethane; 4,4-dihydroxytetraphenylmethane; 1,1-bis (4-hydroxyphenyl) cyclohexane; 2 And bisphenols such as 2,2-bis (4,4-hydroxy-3-methylphenyl) propane; 2,2-bis (4,4-hydroxy-3,5-dimethylphenyl) propane.

In the polydimethylsiloxane having a terminal hydroxyl group represented by the general formula (IV), R ⁵ and R ⁶ are organic residues having an aromatic nucleus. Here, there are various organic residues having an aromatic nucleus, for example, A group represented by A group represented by A group represented by And the like.

The polydimethylsiloxane represented by the general formula (IV) is prepared, for example, by reacting octamethylcyclotetrasiloxane with disiloxane to produce a polydimethylsiloxane having a terminal hydrogen, and reacting the resulting polydimethylsiloxane with allylphenol. Phenol polydimethylsiloxane can be synthesized. At this time, the number of repeating dimethylsilanoxy units can be controlled by the ratio of octamethylcyclotetrasiloxane to disiloxane. This production process can be represented by the following reaction formula.

Here, the number of repeating dimethylsilanooxy units m
Must be 100 or more. If this m is less than 100, the Izod impact resistance decreases when mixed with glass fibers. If m exceeds 400, the production becomes difficult and it is not practical.

After the completion of the reaction, a low boiling component (mainly a dimer to a trimer)
It is desirable to carry out vacuum distillation in order to remove. The conditions of the vacuum distillation are not particularly limited, but the pressure is not higher than 10 Torr at 100 to 200 ° C. until low-boiling components are not distilled off (for example, 1 to 200 ° C.).
Min) Distillation may be performed.

Phosgene is usually used as the carbonate-forming derivative, but in addition to this phosgene, various compounds such as bromophosgene, diphenyl carbonate,
It is also possible to use di-p-tolyl carbonate, phenyl-p-tolyl carbonate, di-p-chlorophenyl carbonate, dinaphthyl carbonate, or the like, or a polycarbonate oligomer comprising these compounds and the organic dihydroxy compound.

In the present invention, a polycarbonate-polydimethylsiloxane copolymer (hereinafter, may be referred to as a PC-PDMS copolymer) from the above-mentioned organic dihydroxy compound, polydimethylsiloxane, and a carbonate-forming derivative.
It is necessary to make a molecular weight regulator exist in the reaction system in producing the compound. As the molecular weight regulator, various substances can be used. Specifically, pantahalogenophenol (for example, pentabromophenol, pentachlorophenol, pentafluorophenol), and trihalogenphenol (for example, tribromophenol,
Trichlorophenol, trifluorophenol), phenol, p-cresol, p-tert-butylphenol, p
-Tert-octylphenol, p-cumylphenol and the like.

The charge amount of the organic dihydroxy compound may be appropriately determined depending on the degree of polymerization of the polycarbonate block to be produced. On the other hand, the amount of the molecular weight regulator and the amount of the carbonate ester-forming derivative to be introduced defines the degree of polymerization of the polycarbonate block. Therefore, the introduction amount may be an amount according to the purpose. The specific amount of the molecular weight regulator to be introduced may be an amount sufficient to bond to the terminal positions (particularly, both terminal positions) of the produced polycarbonate or an amount slightly larger than the amount.

The polydimethylsiloxane is preferably blended so as to be present in the copolymer in an amount of 0.5 to 10% by weight, particularly 1 to 10% by weight. When this amount is less than 0.5% by weight, the Izod impact resistance is reduced when mixed with glass fibers. However, if it exceeds 10% by weight, the heat distortion temperature decreases.

In the method of the present invention, PC-
The method is for producing a PDMS copolymer. Specifically, the reaction proceeds according to a known interfacial polymerization method, pyridine method, or the like.

For example, a solution in which the polydimethylsiloxane of the general formula (IV) is dissolved in an inert organic solvent such as methylene chloride, chloroform, chlorobenzene, and carbon tetrachloride, and an alkali aqueous solution (a sodium hydroxide aqueous solution, a potassium hydroxide aqueous solution, a sodium carbonate aqueous solution) And the like, and an interfacial polycondensation is advanced by blowing a carbonate-forming derivative such as phosgene into a mixture of a solution in which the organic dihydroxy compound of the general formula (III) is dissolved. In this reaction, a molecular weight regulator is added to the reaction system in advance or at a stage after the reaction has progressed to some extent. It is also effective to add a tertiary amine such as triethylamine to the reaction system as a catalyst (hydrohalogenation agent). Further, at this time, since the reaction system generates heat, it is preferable to cool with water or ice,
Since the reaction system shifts to an acidic side as the reaction proceeds, it is preferable to maintain the pH at 10 or more by adding an alkali while measuring with a pH meter.

Incidentally, a polycarbonate oligomer was previously synthesized from the organic dihydroxy compound of the general formula (III) and the carbonate-forming derivative, and this oligomer and the general formula (I
It is also effective to mix and agitate the polydimethylsiloxane of V), the molecular weight modifier, the above-mentioned inert organic solvent and the aqueous alkali solution, and the catalyst at a predetermined ratio to promote interfacial polycondensation.

On the other hand, according to the pyridine method, the starting material represented by the general formula (II
I) An organic dihydroxy compound, a polydimethylsiloxane of the general formula (IV) and a molecular weight regulator are dissolved in pyridine or a mixed solvent of pyridine and an inert solvent, and a carbonate-forming derivative such as phosgene is blown into this solution. The desired PC-PDMS copolymer is formed.

Represented by the general formula (I) obtained as described above
The copolymer comprising the PC block and the PDMS block represented by the general formula (II) is 10,000 to 50,000, preferably 12,000
It has a viscosity average molecular weight of 3030,000. If the viscosity average molecular weight is less than 10,000, the Izod impact resistance is low, which is not suitable for the purpose of the present invention. However, those having a viscosity average molecular weight exceeding 50,000 are difficult to produce.

The PC-PDMS copolymer of the present invention has an n-hexane soluble content of 1.0% by weight or less. Here, when the n-hexane soluble content exceeds 1.0% by weight, the effect of improving the Izod impact resistance when mixed with an inorganic filler such as glass fiber is small. In order to increase the effect of improving the Izod impact resistance especially when mixed with glass fiber, etc., the above PC-PDMS
The copolymer having a crystallinity of 30% or more is preferred.

In addition, this n-hexane soluble matter is 1.0 wt% or less PC
-To produce a PDMS copolymer, for example, PD in the copolymer
The content of MS is set to 10% by weight or less, the number of repeating dimethylsilanooxy units in PDMS is 100 or more, and a catalyst such as a tertiary amine is used in an amount of 5.3 × 10 ⁻³ mol / kg ·
The copolymerization reaction described above may be performed using oligomers or more.

Further, the composition of the present invention, the PC-PDMS copolymer 40 ~
90% by weight and 60 to 10% by weight of inorganic filler. Here, there are various inorganic fillers, and examples thereof include various fillers such as glass fiber and carbon fiber. The glass fibers include alkali-containing glass and low-alkali glass. Any non-alkali glass may be used, and the fiber length is 1 to 8 mm, preferably 3 to 6 mm, and the fiber diameter is 3 to 20 μm, preferably 5 to 15 μm. The form of the glass fiber is not particularly limited, and examples thereof include various types such as roving, milled fiber, and chopped strand. These glass fibers can be used alone or in combination of two or more. In order to enhance the affinity with the above-mentioned copolymer, such a glass fiber is coated with a silane coupling agent such as an aminosilane, an epoxysilane, a vinylsilane or a methacrylsilane, a chromium complex compound, a boron compound or the like. It may be processed.

Carbon fiber is generally produced by firing cellulose fiber, acrylic fiber, lignin, petroleum or coal-based special pitch as a raw material.
There are various types such as carbonaceous or graphitic.
The length of the carbon fiber is usually in the range of 0.01 to 10 mm in the pellet, and the fiber diameter is 5 to 15 μm. The form of the carbon fiber is not particularly limited, and examples thereof include roving, milled fiber, chopped strand, and strand. There are various types. The surface of the carbon fiber may be subjected to a surface treatment with an epoxy resin or a urethane resin in order to increase the affinity with the copolymer.

Furthermore, as other fillers, those of various shapes,
For example, there are plate-like, granular, and powdery fillers. Specific examples include glass beads, glass flakes, glass powder, talc, mica, calcium carbonate, and the like.

The resin composition of the present invention has the above-mentioned PC-PDMS copolymer and an inorganic filler as main components, and further contains various components as necessary, for example, the PDMS content in the copolymer,
In the range of 0.5 to 10% by weight, PC, PDMS, and even PDMS
It is also possible to add a PC-PDMS copolymer having a content of less than 0.5% by weight.

〔Example〕

 Next, the present invention will be described in more detail with reference to examples.

Production Example 1-1 (Synthesis of PDMS with terminal phenol) 1483 g of octamethylcyclotetrasiloxane, 18.1 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. Thereafter, the mixture was filtered and vacuum distilled at 150 ° C. and 3 Torr to remove low-boiling substances.

To a mixture of 60 g of 2-allylphenol and 0.0014 g of platinum as platinum chloride-alcoholate complex, 294 g of the oil obtained above were added at a temperature of 90 ° C. The mixture was stirred for 3 hours while maintaining the temperature between 90 ° C and 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 sulfate and evaporated in vacuo to a temperature of 115 ° C.

According to nuclear magnetic resonance (NMR) measurement, the number of repeating dimethylsilanooxy units in the obtained terminal phenol PDMS was
It was 150.

Production Example 1-2 (Synthesis of PDMS with terminal phenol) The same operation as in Production Example 1-1 was carried out except that the amount of 1,1,3,3-tetramethyldisiloxane was changed to 7.72 g in Production Example 1-1. did.

According to NMR measurement, the number of repeating dimethylsilanooxy units in the obtained terminal phenol PDMS was 350.

Production Example 1-3 (Synthesis of PDMS with terminal phenol) The same operation as in Production Example 1-1 was carried out except that the amount of 1,1,3,3-tetramethyldisiloxane was changed to 137 g in Production Example 1-1. .

According to NMR measurement, the number of repeating dimethylsilanooxy units in the obtained terminal phenol PDMS was 20.

Production Example 1-4 (Synthesis of PDMS with terminal phenol) The same operation as in Production Example 1-1 was carried out except that the amount of 1,1,3,3-tetramethyldisiloxane was changed to 33.5 g in Production Example 1-1. did.

According to NMR measurement, the number of repeating dimethylsilanooxy units in the obtained terminal phenol PDMS was 80.

Production Example 2 (Synthesis of polycarbonate oligomer of bisphenol A) Bisphenol A (60 kg) was dissolved in 400% 5% 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 introduced at a flow rate of 138 / hour and methylene chloride at a flow rate of 69 / hour through an orifice plate into a tubular reactor having an inner diameter of 10 mm and a pipe length of 10 m. Phosgene was blown into the mixture 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. Further, the pH of the discharged liquid was adjusted to indicate 10 to 11. The reaction solution thus obtained is allowed to stand, whereby the aqueous phase is separated and removed, and the methylene chloride phase (220
) And further add methylene chloride 170
Was added and thoroughly stirred to obtain a polycarbonate oligomer (concentration: 317 g /). The degree of polymerization of the obtained polycarbonate oligomer was 3 to 4.

Examples 1 to 12 and Comparative Examples 1 to 10 The reactive PDMS ag obtained in Production Example 1-X was dissolved in methylene chloride 2 and mixed with the polycarbonate oligomer 10 obtained in Production Example 2. There, sodium hydroxide
A solution of 26 g in water 1 and triethylamine dcc were added, and the mixture was stirred at 500 rpm for 1 hour at room temperature. Then 5.2
Bisphenol in 5% by weight aqueous sodium hydroxide solution 5
A solution of 600 g of A, methylene chloride 8 and p-tert-butylphenol bg were added, and the mixture was stirred at 500 rpm at room temperature for 2 hours. After that, methylene chloride 5
And further washed with water 5, washed with 0.01N aqueous sodium hydroxide solution 5 in alkali, washed with 0.1N hydrochloric acid 5 in acid and washed with water 5 in order, and finally, methylene chloride was removed. PDMS copolymer was obtained.

Table 1 shows the values of X (number of Production Example 1) and a, b, and d of Examples 1 to 12 and Comparative Examples 1 to 10. Also obtained PC
Table 2 shows the viscosity average molecular weight, PDMS chain length (dimethylsilanooxy unit), PDMS content, and n-hexane soluble matter of the PDMS copolymer. Table 3 shows the flow value, flexural modulus, Izod impact strength, heat distortion temperature (HDT) and crystallinity of the molded product. In addition, the PC manufactured in Example 2
FIG. 1 shows a proton nuclear magnetic resonance ( ¹ H-NMR) spectrum of the PDMS copolymer. FIG. 2 shows the relationship between the number of dimethylsilanooxy units in the polydimethylsiloxane portion and the Izod impact strength of the molded article in the PC-PDMS copolymers produced in the examples and comparative examples.

In the above table, the PDMS content and the PDMS chain length (dimethylsilanooxy unit) were measured as described below.
That is, the PDMS content is determined by the intensity ratio of the peak of the isopropyl methyl group of bisphenol A found at 1.7 ppm in the proton nuclear magnetic resonance ( ¹ H-NMR) spectrum to the peak of the methyl group of dimethylsiloxane found at 0.2 ppm. Was. On the other hand, the PDMS chain length is the peak of the methyl group of dimethylsiloxane seen at 0.2 ppm in ¹ H-NMR and the PC-PD seen at 2.6 ppm.
It was determined from the intensity ratio of the peak of the methylene group at the MS bond.

The n-hexane soluble component is a component obtained by Soxhlet extraction using n-hexane as a solvent, and its measurement was performed as follows. That is, 15 g of a chip-shaped copolymer, which is a sample, was collected on a thimble filter paper No. 84 (28 × 100 mm), and 300 ml of n
Extraction was carried out using hexane by refluxing once every 3 to 4 minutes (20 ml / time) for 8 hours. Then 300ml of n
-The residue after evaporation of the hexane is weighed and
-Hexane soluble matter.

Each measured value in Tables 2 and 3 was obtained by the following method.

Flow value (× 10 ^-2 ml / sec): Based on JIS-K-7210.

Flexural modulus (kg / cm ² ): based on JIS-K-7103.

Izod impact strength (kg-cm / cm): Based on JIS-K-7110.

HDT [heat distortion temperature] (° C): based on JIS-K-7207.

Mv [viscosity average molecular weight]: 20 ° C in an Ubbelohde type viscosity tube
Was calculated from the viscosity of the methylene chloride solution.

Crystallinity: 5mmg of copolymer is placed in an aluminum pan and heating rate
The melting peak area S (kilojoules / mol) obtained from a differential scanning calorimeter (DSC) chart measured at 40 ° C./min was used, and the crystallinity C was calculated from the following equation.

C (%) = (S / 27.9) × 100 The value of 27.9 (kilojoules / mol) is the melting enthalpy determined for 100% of perfect crystals (JP
S. B8 645 (1970)).

Application Examples 1 to 28 PCs obtained in Examples and Comparative Examples as base polymers
PDMS copolymer, polycarbonate (trade name: Teflon A-2200, Mv = 21000, manufactured by Idemitsu Petrochemical Co., Ltd.) or polycarbonate (trade name: Iupilon H-4000N-6)
00, Mv = 15000, Mitsubishi Gas Chemical Co., Ltd.), blended with glass fiber (GF) (alkali-free glass surface-treated with aminosilane, fiber length: 6mm, fiber diameter: 13μm), with 30mm vent Pellets were formed by an extruder, injection molded at a molding temperature of 300 ° C. to obtain molded articles, and physical properties were measured. 4th result
It is shown in the table. In addition, the glass fiber was supplied from the downstream side of the hopper supply position of the raw material resin of the extruder.

Application Examples 29 to 32 The PC-PDMS copolymer or polycarbonate (trade name: Toughlon A-2200, Mv = 21000, manufactured by Idemitsu Petrochemical Co., Ltd.) obtained in Example 7 was used as a base polymer.
Glass beads (EGB-731A, manufactured by Toshiba Parodini KK)
And 30% vented extruder to make pellets,
Izod impact strength was measured by injection molding at a molding temperature of 300 ° C. The results are shown in Table 5. In addition, the glass beads were supplied from the downstream side of the raw resin hopper supply position of the extruder.

Application Examples 33 to 36 The PC-PDMS copolymer or polycarbonate (trade name: Toughlon A-2200, Mv = 21000, manufactured by Idemitsu Petrochemical Co., Ltd.) obtained in Example 7 was used as a base polymer.
It was blended with carbon fiber (manufactured by Toho Veslon Co., Ltd., trade name: Vesfight), pellets were formed by an extruder with a 30 mm vent, injection molded at a molding temperature of 300 ° C., and the Izod impact strength was measured. The results are shown in Table 6. In addition, the carbon fiber was supplied from the downstream side of the raw resin hopper supply position of the extruder.

Industrial applicability The PC-PDMS copolymer of the present invention has high impact resistance,
By mixing with an inorganic filler such as glass fiber, a molded article having extremely high Izod impact strength can be produced.

Further, according to the method of the present invention, a PC-PDMS copolymer can be efficiently produced.

Therefore, the present invention is expected to be effectively used for producing molded articles having excellent impact resistance.

Claims (4)

(57) [Claims] (1) General formula [Wherein, R ¹ and R ² each independently represent hydrogen, carbon number 1 to 4
Wherein R ³ is hydrogen, halogen or carbon atom 1
R ⁴ represents hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms or an aryl group, and x represents 1 to 5
Y represents an integer of 1 to 4, and n represents 1 to 100.
Indicates an integer. And a general formula Wherein R ⁵ and R ⁶ are each independently Group represented by the formula Group represented by the formula Groups and formulas represented by And m represents an integer of 100 to 400. A copolymer comprising a polydimethylsiloxane block represented by the formula: wherein the proportion of the polydimethylsiloxane block portion in the copolymer is 0.5 to 10% by weight and the n-hexane soluble component of the copolymer is Is 1.0% by weight or less and a viscosity average molecular weight of 10,000 to 50,000. 2. The general formula Wherein R ¹ , R ² , R ⁴ and y are the same as above. An organic dihydroxy compound represented by the general formula: Wherein R ⁵ , R ⁶ and m are the same as above. The method for producing a polycarbonate-polydimethylsiloxane copolymer according to claim 1, wherein the polydimethylsiloxane represented by the following formula is reacted with a carbonate-forming derivative in a liquid medium in the presence of a molecular weight modifier. 3. The polycarbonate-polydimethylsiloxane copolymer of claim 1, comprising 40 to 90% by weight and an inorganic filler of 60 to 90% by weight.
A resin composition comprising 10% by weight. 4. The resin composition according to claim 3, wherein the inorganic filler is glass fiber or carbon fiber.