JPH07224219A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To obtain the title composition useful as a molding material or an additive which can impart persistent wear resistance and water repellency by using a polycarbonate terminated with a polysiloxane structure. CONSTITUTION:This composition is one containing a poly-carbonate derived from a dihydric phenol compound and a poly- -siloxane-terminated polycarbonate represented by formula I [wherein R1 and R2 are each H, halogen, alkoxyl, nitro, (substituted) alkyl or (substituted) aryl; R3 and R4 are each H, alkyl or aryl ; at least one of R5, R6 and R7 is a group of formula II (wherein R8, R9 and R10 are each alkyl or aryl), and the rest are alkyl and aryl; m is 1-20; n is 1-500; and X is OH, COOH or an acid chloride group] and having an intrinsic viscosity of 2.0dl/g or below. This composition has high persistent wear rersistance and therefore is applicable to moldings, such as lenses, light covers and bearings, which need to have wear resistance.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel polycarbonate resin composition. The polycarbonate resin composition of the present invention is a polycarbonate resin composition containing a novel polycarbonate having a polysiloxane structure at the molecular end, and is useful as various molding materials, modifiers for polymer alloys, and additives.

[0002]

2. Description of the Prior Art Most of polycarbonate resins currently produced are 2,2-bis (4-hydroxyphenyl).
It is a bisphenol A type polycarbonate made from propane (bisphenol A). Bisphenol A-type polycarbonate is a polycarbonate resin that has well-balanced cost, heat resistance, mechanical strength, etc., but with the recent expansion of applications of polycarbonate, polycarbonates with more superior physical properties are desired, and various structures are required. Polycarbonate has been developed. However, there is a demand from the market for polycarbonates having physical properties that are even better or that have unique physical properties, and new polycarbonates are being developed.

As one of them, a siloxane block copolymerized polycarbonate having improved releasability and fluidity has been developed (JP-A-3-079626, JP-A-5-155).
999, JP-A-50-29695). These siloxane-copolymerized polycarbonates have improved wear resistance, reduced surface free energy, and water-repellent properties. However, these siloxane-copolymerized polycarbonates are random copolymers in which siloxane-containing components are randomly bonded, and when the amount of the siloxane compound used is small, a polycarbonate homopolymer is likely to be formed and the siloxane-containing polycarbonate is highly contained. It is difficult to obtain such a copolymer. The siloxane-copolymerized polycarbonate is used by itself, but is relatively expensive and is often practically used as a modifier for other resins except in special cases.

When used as a modifier, it exhibits an effect of imparting abrasion resistance, water repellency and the like to a molded product, and particularly in the case of wet molding, polycarbonate having a siloxane block is unevenly distributed on the surface layer of the molded product. It is known. This phenomenon itself has the advantage that the surface of the molded product can be modified by adding and blending a small amount as a modifier, but when used for a long period of time, the wear resistance and water repellency of the surface drop sharply. It is difficult to maintain abrasion resistance and water repellency over a long period of time.

Further, a polycarbonate having a monosiloxane at the terminal has been developed (for example, Japanese Patent Application Laid-Open No. 4-2).
64129). However, although this polycarbonate can exhibit suitable properties when used as a low molecular weight oligomer, in the case of a high molecular weight polymer, the content of siloxane in the entire polymer is relatively small, and sufficient abrasion resistance is obtained. It is not possible to exhibit the properties and water repellency. Therefore, a polycarbonate that can maintain sufficient abrasion resistance, water repellency and the like for a long period of time is particularly desired when used as a surface coating material or the like. In view of the above circumstances, the present invention provides a polycarbonate resin composition capable of imparting excellent wear resistance, water repellency and the like for a long period of time.

[0006]

As a result of intensive studies to solve the conventional problems, the present inventors have found that a terminal-modified polycarbonate having a polysiloxane at the molecular end is a novel polycarbonate not described in the literature. It was found that the polycarbonate resin composition containing the terminal-modified polycarbonate is useful as various molding materials and raw materials for polymer alloys, and the present invention has been completed based on this finding.

That is, the present invention is a resin composition comprising a terminal-modified polycarbonate in which a polysiloxane represented by the following general formula (A) is bonded to a molecular end, and a polycarbonate derived from a dihydric phenol compound, The present invention relates to a polycarbonate resin composition having an intrinsic viscosity [η] of 2.0 [dl / g] or less.

[0008]

[Chemical 3]

(In the formula, R _{1 and} R ₂ each represent hydrogen, halogen, an alkoxyl group, a nitro group or an optionally substituted alkyl group or aryl group. R _{3 and} R ₄ are hydrogen and alkyl. Represents a group or an aryl group, and at least one of R _{5 to} R ₇ has the following structure.

[0010]

[Chemical 4]

And the rest are alkyl groups or aryl groups. R ₈ ~ R ₁₀ represents an alkyl group or an aryl group. m represents an integer of 1 to 20 and n represents an integer of 1 to 500. X represents a hydroxyl group, a carboxyl group, or an acid chloride. )

The terminal-modified polycarbonate in which the polysiloxane represented by the general formula (A) constituting the resin composition of the present invention is bonded to the molecular end, and the general polycarbonate derived from the dihydric phenol compound are known per se. It is easily produced by a method such as the phosgene method or transesterification method.

That is, the terminal-modified polycarbonate in which the polysiloxane represented by the general formula (A) is bonded to the molecular terminal is a monofunctional polysiloxane compound represented by the general formula (A) and a divalent phenol such as bisphenol A. It can be obtained by reacting at least one of the system compounds with a carbonic acid ester forming compound. A polycarbonate derived from a dihydric phenol compound can be obtained by reacting at least one dihydric phenol compound with a carbonic acid ester forming compound.

In the phosgene method, the dihydric phenol compound is usually reacted with phosgene in the presence of an acid binder and a solvent. As the acid binder, for example, pyridine, hydroxides of alkali metals such as sodium hydroxide and potassium hydroxide can be used, and as the solvent, for example, methylene chloride, chloroform, chlorobenzene, xylene and the like can be used. You can Furthermore, in order to accelerate the polycondensation reaction, a catalyst such as a tertiary amine such as triethylamine or a quaternary ammonium salt is used, and in order to control the degree of polymerization, the monofunctional group serves as a molecular weight regulator. Can be fulfilled If desired, a small amount of an antioxidant such as sodium sulfite or hydrosulfite or a branching agent such as phloroglucin or isatin bisphenol may be added. Reaction is usually 0
It is suitable that the temperature is in the range of to 150 ° C, preferably 5 to 40 ° C. The reaction time depends on the reaction temperature,
It is usually 0.5 minutes to 10 hours, preferably 1 minute to 2 hours. Further, it is desirable to keep the pH of the reaction system at 10 or more during the reaction.

In the transesterification method, a dihydric phenol and a bisaryl carbonate are mixed and reacted at a high temperature under reduced pressure. The reaction is usually carried out at a temperature in the range of 150 to 350 ° C., preferably 200 to 300 ° C., and the degree of reduced pressure is finally set to preferably 1 mmHg or less, and phenols derived from the bisaryl carbonate produced by the transesterification reaction. Is removed from the system. The reaction time depends on the reaction temperature and the degree of pressure reduction, but is usually 1
It is about 4 hours. The reaction is preferably carried out in an atmosphere of an inert gas such as nitrogen or argon. If desired, the reaction may be carried out by adding an antioxidant or a branching agent.

Specific examples of the dihydric phenol compound used in the polycarbonate of the present invention include biphenol, bis (4-hydroxyphenyl) methane and bis (4-
Hydroxyphenyl) ether, bis (4-hydroxyphenyl) sulfone, bis (4-hydroxyphenyl)
Sulfoxide, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) ketone, 1,1-
Bis (4-hydroxyphenyl) ethane, 2,2-bis (4-
Hydroxyphenyl) propane [= bisphenol A;
BPA], 2,2-bis (4-hydroxyphenyl) butane, 1,
1-bis (4-hydroxyphenyl) cyclohexane [=
Bisphenol Z; BPZ], 2,2-bis (4-hydroxy-
3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-
Bis (4-hydroxy-3-chlorophenyl) propane,
2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 1,1-bis (4-hydroxyphenyl) -1 -
Phenylethane, bis (4-hydroxyphenyl) diphenylmethane, α, ω-bis [2- (P-hydroxyphenyl) ethyl] polydimethylsiloxane, α, ω-bis [3- (O-hydroxyphenyl) propyl] polydimethyl Examples include siloxane and the like. You may use these in combination of 2 or more types.

Of these, 2,2-bis (4-
Hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -1-phenyl From the viewpoint of reactivity, it is preferable to be selected from ethane, bis (4-hydroxyphenyl) ether and bis (4-hydroxyphenyl) sulfide.

On the other hand, examples of the carbonic acid ester forming compound include phosgene, diphenyl carbonate and di-
Examples thereof include bisallyl carbonates such as p-tolyl carbonate, phenyl-p-tolyl carbonate, di-p-chlorophenyl carbonate, and dinaphthyl carbonate.

In producing a polycarbonate by these methods, it is usually preferable to use a monofunctional compound as a terminal terminator in order to control the molecular weight. Examples of such an end terminating agent include compounds such as phenol, p-cumylphenol, pt-butylphenol, benzoic acid and benzyl chloride which are usually used in the production of polycarbonate.

When the terminal-modified polycarbonate of the present invention is produced, the phosgene method is preferred from the viewpoints of heat resistance and transesterification rate of the monofunctional polysiloxane compound represented by the general formula (A). Further, in the case of using the phosgene method, the monofunctional polysiloxane compound represented by the general formula (A) is used in an amount of 50 mol% or less based on the total phenol compound in view of solubility and reactivity. It is desirable to do.

The monofunctional polysiloxane represented by the above general formula (A) is produced by a known hydrosilylation reaction, for example, a polyphenol having an Si-H group at one end of a monohydric phenol having an unsaturated group. It is produced by a method in which siloxane is subjected to an addition reaction under a platinum catalyst.

The catalyst used for the hydrosilylation may be either homogeneous or heterogeneous. Specifically, platinum complexes represented by chloroplatinic acid, platinum metal, octacarbonyl 2-cobalt, palladium complex, rhodium complex. Etc. The reaction is carried out in a solvent that dissolves the monofunctional phenyl compound containing an unsaturated group used in the present invention. Specifically, carbon tetrachloride, chloroform, 1,2-
Examples include halogenated hydrocarbons such as dichloroethane, aromatic hydrocarbons such as benzene, toluene and xylene, aromatic halides such as monochlorobenzene and dichlorobenzene, methyl ethyl ketone, ethyl acetate, 1,4-dioxane, cyclohexanone and pyridine. However, aromatic hydrocarbons such as benzene, toluene, and xylene are preferable because of their solubility and compatibility with the catalyst. The reaction temperature is preferably 60 ° C or higher.

The polysiloxane group in the present invention is derived from polyalkyl siloxane, polyaryl siloxane, polyalkylaryl siloxane, etc., and specifically, polydimethyl siloxane, polydiethyl siloxane, polydiphenyl siloxane, poly Methyl phenyl siloxane etc. are mentioned. These are 2
You may use together more than one kind. The length of the polysiloxane group is
It is represented by the degree of polymerization n in the formula (A), and n is 1 to 500, and preferably 20 to 500. In order to obtain sufficient siloxane characteristics, it is preferable that n is large to some extent.
When the value exceeds 500, the reactivity of the monofunctional phenyl compound having an unsaturated group is poor and it is not very practical. Further, since polysiloxane is a polymer, it is a mixture of short and long polymer chains, and the degree of polymerization n is merely the average degree of polymerization, and the degree of polymerization usually exists with a distribution.

The monofunctional phenyl compound having an unsaturated group capable of reacting with polysiloxane in the present invention is specifically p-hydroxystyrene, p-isopenylphenol, O-allylphenol, eugenol, isoeugenol. , 2,6-dimethyl-4-allylphenol, 4- (1-butenyl) phenol, 4- (1-pentanyl) phenol, 4- (1-hexanyl) phenol, 4- (1-octanyl) phenol, 4- (1-Decanyl) phenol, 4- (1-dodecanyl) phenol, 4- (1-tetradecanyl) phenol, 4- (1
Examples thereof include phenol-based compounds such as -hexadecanyl) phenol and 4- (1-nonadecanyl) phenol, and compounds in which the phenolic hydroxyl groups are substituted with a carboxyl group or an acid chloride. These compounds are 2
It is also possible to use together more than one kind. Of these monofunctional phenyl compounds, phenolic compounds are preferred.

Specific examples of the monofunctional polysiloxane compound represented by the general formula (A) are shown below.

[0026]

[Chemical 5]

[0027]

[Chemical 6]

[0028]

[Chemical 7]

It is also possible to use two or more of the above polysiloxanes in combination. (W is an integer of 1 to 500, and (n + w ≦ 1000).

In producing the end-modified polycarbonate of the present invention, conventional end-capping agents such as phenol,
It is also possible to use it in combination with p-cumylphenol, pt-butylphenol, benzoic acid, benzyl chloride and the like.

The polycarbonate synthesized by these reactions can be molded by known molding methods such as extrusion molding, injection molding, blow molding, compression molding, and wet molding, but it is a polycarbonate resin because it can be easily molded. The composition preferably has an intrinsic viscosity [η] of 2.0 (dl / g) or less. The ratio of the terminal-modified polycarbonate in the polycarbonate resin composition can be arbitrarily selected, but is 0.01 to 99.
%, Preferably 0.01 to 50% by weight. The content of polysiloxane in the polycarbonate resin composition is 50% by weight or less, preferably 20% by weight.
It is the following. When the content of the polysiloxane exceeds 50% by weight, the production is difficult, and the transparency and moldability may be hindered.

As the method for mixing the resin composition of the present invention, the conventional polymer blending method can be used as it is. Specific examples thereof include a method of blending the terminal-modified polycarbonate of the present invention with another polycarbonate by powder or pellets, a method of dissolving the terminal-modified polycarbonate and another polycarbonate in a solvent, and blending.

In producing these compositions, if desired, antioxidants, light stabilizers, colorants, inorganic and organic fillers, reinforcing agents such as carbon fibers and glass fibers, and lubricants. Alternatively, an antistatic agent or the like may be appropriately used in combination.

[0034]

The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

Synthesis Example 1 600 ml of 8.8% (w / v) sodium hydroxide aqueous solution
And 2,2-bis (4-hydroxyphenyl) propane (BP
A) 91.2 g and hydrosulfite 0.5 g were added and dissolved. To this, 360 ml of methylene chloride was added and stirred, and while maintaining the solution temperature at 15 ° C, phosgene 50
b was blown in over 60 minutes. After blowing, the following structure

[0036]

[Chemical 8]

16. The polysiloxane monofunctional compound of 16.
9 g was added and vigorously stirred to emulsify the reaction solution. After emulsification, 0.2 ml of triethylamine was added, and the mixture was stirred for about 1 hour for polymerization. The polymerization liquid was separated into an aqueous phase and an organic phase, the organic phase was neutralized with phosphoric acid, and washing with water was repeated until the pH of the washing liquid became neutral. Then, 470 ml of isopropanol was added to precipitate the polymer. The precipitate was filtered and dried to obtain a powdery polymer. This polymer has a concentration of 0.5 in methylene chloride.
The intrinsic viscosity [η] of a g / dl solution at a temperature of 20 ° C is 0.68d.
It was l / g. As a result of infrared absorption spectrum analysis of the obtained polymer, absorption by a carbonyl group at a position of 1650 cm −1 and absorption by an ether bond at a position of 1240 cm −1 were confirmed, and it was confirmed that the polymer had a carbonate bond. In addition, almost no absorption derived from hydroxyl groups was observed at the position of 3650 to 3200 cm-1. Moreover, 1100-1020 cm-1
A peak derived from siloxane was also confirmed. The amount of residual phenolic OH measured by an absorptiometry was 92 ppm. In addition, it was confirmed by fluorescent X-ray analysis (Cr tube) that this polymer contained silicon element. Therefore, this polymer was judged to be an end-modified polycarbonate having polysiloxane bonded to the end.

Synthesis Example 2 Instead of the polysiloxane-containing monofunctional group compound of Synthesis Example 1,

[0039]

[Chemical 9]

The polysiloxane-containing monofunctional compound was added to 3
Example 1 was repeated except that 1.9 g was used. The intrinsic viscosity [η] of the obtained polymer was 0.70 dl / g, and it was confirmed by absorption spectrum analysis and fluorescent X-ray analysis that this polymer was a polycarbonate having a polysiloxane at the terminal. The amount of residual phenolic OH was 94 ppm.

Synthesis Example 3 Synthesis Example 1 was repeated except that BPA was changed to 107.2 g of 1,1-bis (4-hydroxyphenyl) cyclohexane. The obtained polymer has an intrinsic viscosity [η] of 0.52 dl / g
According to infrared absorption spectrum analysis and fluorescent X-ray analysis, this polymer was recognized as a polycarbonate having siloxane at the terminal. The residual phenolic OH was 88 ppm.

Synthesis Example 4 Instead of the polysiloxane-containing monofunctional group compound of Synthesis Example 1,

[0043]

[Chemical 10]

Two polysiloxane-containing monofunctional compounds were used.
Example 1 was repeated except that 4.1 g was used. The intrinsic viscosity [η] of the obtained polymer was 0.77 dl / g, and no siloxane structure was recognized by infrared absorption spectrum analysis and fluorescent X-ray analysis, and this polymer was recognized as a polycarbonate having siloxane at the end. . Residual phenolic O
H was 75 ppm.

Synthesis Example 5 Instead of the polysiloxane-containing monofunctional group compound of Synthesis Example 1,

[0046]

[Chemical 11]

Two polysiloxane-containing monofunctional compounds were used.
Example 1 was repeated except that 4.1 g was used. The intrinsic viscosity [η] of the obtained polymer was 0.71 dl / g, and no siloxane structure was recognized by infrared absorption spectrum analysis and fluorescent X-ray analysis, and this polymer was recognized as a polycarbonate having siloxane at the terminal. . Residual phenolic O
H was 96 ppm.

Synthesis Example 6 Synthesis Example 1 was repeated except that 1.5 g of pt-butylphenol was used in place of the polysiloxane-containing monofunctional compound of Synthesis Example 1. The intrinsic viscosity [η] of the obtained polymer was 0.63 dl / g, and no siloxane structure was found by infrared absorption spectrum analysis and fluorescent X-ray analysis.
The residual phenolic OH was 85 ppm.

Synthesis Example 7 620 ml of aqueous sodium hydroxide solution, 51 g of phosgene,
As dihydric phenol, 91.2 g of BPA and 1 of α, ω-bis [2- (P-hydroxyphenyl) ethyl] polydimethylsiloxane (Shin-Etsu Chemical Co., Ltd., polymerization degree n = 20) were used.
The same procedure as in Synthesis Example 4 was carried out except that 7.8 g was used. The intrinsic viscosity [η] of the obtained polymer was 0.65 dl / g, and it was confirmed by infrared absorption spectrum analysis and fluorescent X-ray analysis that this polymer was a polycarbonate having siloxane in the main chain constituent unit. The residual phenolic OH was 70 ppm.

Synthetic Example 8 91.2 g of BPA as a dihydric phenol and 3 of α, ω-bis [2- (P-hydroxyphenyl) ethyl] polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., polymerization degree n = 40) were used.
The same procedure as in Synthesis Example 5 was performed except that 2.6 g was used. The intrinsic viscosity [η] of the obtained polymer was 0.68 dl / g, and it was confirmed by infrared absorption spectrum analysis and fluorescent X-ray analysis that this polymer was a polycarbonate having siloxane in the main chain constituent unit. The residual phenolic OH was 75 ppm.

Synthetic Example 9 The procedure of Synthetic Example 1 was repeated except that the monofunctional compound was not used. The obtained polymer became a gel and was insoluble in dichloromethane, so that it was not possible to measure the intrinsic viscosity and it showed the properties of an ultra high molecular weight substance.

Example 1 The end-modified polycarbonate of Synthesis Example 1 was used as the BP of Synthesis Example 4.
20 wt% was added to A-type polycarbonate. The mixed materials were dissolved in dichloromethane to make a 10 wt% solution, and then a cast film having a thickness of 150 μm was produced on a glass substrate. The film was air-dried and then dried at 100 ° C. for 3 hours, then the surface was washed with methanol and air-dried to obtain a test piece. The test piece was subjected to a Taber abrasion tester and evaluated for abrasion resistance.

Example 2 The procedure of Example 1 was repeated, except that the end-modified polycarbonate of Synthesis Example 1 was changed to the end-modified polycarbonate of Synthesis Example 2.

Example 3 The same procedure as in Example 1 was repeated except that the amount of the terminal-modified polycarbonate obtained in Synthesis Example 1 was changed to 40 wt%.

Example 4 Under the conditions of Synthetic Example 1, except that the polycarbonate synthesized by using 3.38 g of the silicon compound of Synthetic Example 1 and 1.2 g of pt-butylphenol as the monofunctional compound was directly used as a cast film. The same procedure as in Example 1 was performed.

Example 5 Example 5 was repeated except that the end-modified polycarbonate of Synthesis Example 1 was replaced with the end-modified polycarbonate of Synthesis Example 3.

Example 6 The procedure of Example 1 was repeated, except that the end-modified polycarbonate of Synthesis Example 1 was changed to the end-modified polycarbonate of Synthesis Example 4.

Example 7 The same procedure as in Example 1 was carried out except that the end-modified polycarbonate of Synthesis Example 1 was changed to the end-modified polycarbonate of Synthesis Example 5.

Comparative Example 1 The procedure of Example 1 was repeated except that only the BPA type polycarbonate of Synthesis Example 4 was used (the polycarbonate of Synthesis Example 1 was not used).

Comparative Example 2 The procedure of Example 1 was repeated, except that the silicon-modified polycarbonate of Synthesis Example 5 was used instead of the terminal silicone-modified polycarbonate of Synthesis Example 1.

Comparative Example 3 The procedure of Example 1 was repeated, except that the silicon-modified polycarbonate of Synthesis Example 6 was used instead of the terminal silicone-modified polycarbonate of Synthesis Example 1.

Table 1 shows the results of the abrasion test of the cast products of the compositions of Examples 1 to 4 and Comparative Examples 1 to 3.

Table 1 ──────────────────────────────────── Actual 1 Actual 2 Actual 3 Actual 4 Actual 5 Actual 6 Actual 7 Ratio 1 Ratio 2 Ratio 3 ───────────────────────────────────── In the composition Weight% of polysiloxane in 2.6 2.6 5.2 2.6 2.2 3.5 4.7 0.0 2.6 4.5 Wear (mg) 12hr 11 10 10 11 12 11 10 17 8 7 24hr 24 23 22 24 26 25 22 32 23 28 48hr 44 39 40 43 43 39 67 67 49 45 Test piece: 10 wt% dichloromethane, a cast film having a thickness of 150 μm was prepared. After drying at 100 ° C. for 3 hours, the surface was washed with methanol and air-dried to obtain a test piece. Amount of wear: The amount of wear after the tape wear test (load 1 Kg, CS-17 wheel, toluene atmosphere). Measure the amount of wear after 12 hours, 24 hours, and 48 hours.

[0064]

Industrial Applicability The polycarbonate resin composition of the present invention contains a novel polymer having a polysiloxane structure at the terminal of a repeating unit, which has not been described in the literature, and is used as a raw material for various molding materials and polymer alloys. Can be provided. In particular, the polycarbonate polymer of the present invention has a relatively uniform distribution of siloxane groups in comparison with conventional polysiloxane random block copolycarbonates, while the degree of freedom of siloxane is increased. It has high wear resistance for a long period of time, and can be applied to molded products that require wear resistance such as lenses, lighting covers, and bearings.

Claims (2)

[Claims] 1. A terminal-modified polycarbonate in which a polysiloxane represented by the following general formula (A) is bonded to a molecular end,
A polycarbonate resin composition comprising a polycarbonate derived from a dihydric phenol compound and having an intrinsic viscosity [η] of 2.0 [dl / g] or less. [Chemical 1] (In the formula, R _{1 and} R ₂ each represent hydrogen, a halogen, an alkoxyl group, a nitro group, or an optionally substituted alkyl group or aryl group. R _{3 and} R ₄ represent hydrogen, an alkyl group, or aryl. Represents a group, and R _{5 to} R ₇ are at least 1
The following is the structure: And the rest are alkyl groups or aryl groups. R ₈ to R ₁₀ represents an alkyl group or an aryl group. m represents an integer of 1 to 20 and n represents an integer of 1 to 500. X represents a hydroxyl group, a carboxyl group, or an acid chloride. ) 2. The dihydric phenol compound is 2,2-bis (4-
Hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) -1-phenyl The resin composition according to claim 1, which contains a polycarbonate derived from a dihydric phenol compound, which is ethane, bis (4-hydroxyphenyl) ether, or bis (4-hydroxyphenyl) sulfide.