JP2000248057A - Aromatic polycarbonate copolymer and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an aromatic polycarbonate excellent in melt fluidity, etc., and useful as a material for injection molding by subjecting a specific dihydroxy compound to polycondensation with a carbonate-forming compound and specifying intrinsic viscosity and glass transition concentration. SOLUTION: (A) A dihydroxy compound comprising (i) a compound of formula I [R1 and R2 are each a 1-20C alkylene; R3 is a 1-20C alkyl; (p) is 1-4], (ii) a compound of formula II [R4 and R5 are each H, a 1-20C alkyl, a 1-20C alkoxy, a 6-20C aryl or the like; (m) and (n) are each 1-4; X is a single bond, O, carbonyl, a 1-20C alkylene or the like] and (iii) as necessary, a compound of the formula HO-R6-OH (R6 is a 1-40C alkyl) is subjected to polycondensation with (B) a carbonate-forming compound to provide the objective aromatic polycarbonate having >=0.3 g/d intrinsic viscosity (measured in 0.5 g/d concentration solution using methylene chloride as a solvent at 20 deg.C) and >=100 deg.C glass transition temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel copolymerized polycarbonate and an aromatic polyester carbonate. More specifically, the present invention relates to a copolymerized polycarbonate resin having excellent fluidity and excellent thermal stability, which has not been obtained with conventional polycarbonates, and a method for producing the same.

[0002]

2. Description of the Related Art Polycarbonate is a molding material excellent in mechanical properties such as impact resistance, toughness and dimensional stability, transparency and heat resistance. However, polycarbonate generally has a high melt viscosity, and thus has a drawback that the melt fluidity during molding is poor, and it has been difficult to injection-mold precision parts and thin objects. In order to improve the melt fluidity, it is necessary to increase the molding temperature and the mold temperature. Therefore, there is a problem that a molding cycle is lengthened, a molding cost is increased, and deterioration such as coloring and a decrease in polymerization degree occurs during molding.

[0003] In order to improve the fluidity, Japanese Patent Application Laid-Open No.
As exemplified in JP-A-86676 and JP-A-6-25523, there is a method of lowering the weight average molecular weight by mixing a low molecular weight polycarbonate. However, the polycarbonate obtained by this method has a disadvantage that the impact resistance and the thermal stability are significantly reduced.

Attempts have also been made to improve the flowability and moldability by adding a plasticizer such as a fatty acid ester or a lubricant to polycarbonate. However, as pointed out in JP-A-9-227773, these methods have the effect of improving the flowability and moldability of polycarbonate, but they are not necessarily satisfactory in terms of the compatibility and miscibility of the additives. However, there are disadvantages such as a significant decrease in the above properties of the polycarbonate.

As another method for improving the fluidity, a copolymerized polycarbonate containing a component having a high aliphatic content has been studied.
The effect is exemplified in, for example, Japanese Patent Publication No. 3 (JP-A) No. 3 (1999). However, in this method, generally, although the fluidity of the polycarbonate is improved by the copolymerization component, a problem that the thermal stability is greatly reduced has been recognized. For this reason, there is a strong demand for the development of an effective copolymer component capable of improving fluidity while maintaining good thermal stability.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to obtain a polycarbonate or polyester carbonate having excellent fluidity, which cannot be obtained by a conventional polycarbonate, particularly as a material for injection molding.

[0007]

The present inventors have studied the fluidity and thermal stability of various copolymerized polycarbonates in order to solve the above-mentioned problems. The present inventors have found that a polycarbonate or polyester carbonate excellent in fluidity and heat stability can be obtained by polymerization, and have reached the present invention. That is, the present invention provides the following formula (1)

[0008]

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(R ¹ and R ² each independently have 1 carbon atom
Represents a 20 alkylene group, R ³ represents an alkyl group having 1 to 20 carbon atoms, p is an integer of 1 to 4. (A) component represented by the following formula (2):

[0010]

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(Wherein R ⁴ and R ⁵ are each independently:
A hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and 6 to 20 carbon atoms
Represents an aryloxy group having 6 to 20 carbon atoms, and m and n each independently represent 1 to 4
Is an integer. X represents a single bond or an oxygen atom, a carbonyl group, an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 6 to 20 carbon atoms, or an arylene group having 6 to 20 carbon atoms. A) a polycarbonate produced by polycondensing a dihydroxy compound comprising the component (B) represented by the formula (1) and a carbonic acid diester, and a method for producing the same. More preferably, as the dihydroxy compound, in addition to the above components (A) and (B), the following formula (3)

[0012]

HO-R ⁶ -OH (3) (wherein, R ⁶ represents an alkyl group having 1 to 40 carbon atoms)
An aromatic polycarbonate containing the component (C) represented by
And its manufacturing method. Further, a dihydroxy compound comprising the above component (B), a carbonic acid diester, and the following formula (4)

[0013]

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(Wherein R ⁷ and R ⁸ are each independently an alkylene group having 1 to 20 carbon atoms, R ⁹ is an alkyl group having 1 to 20 carbon atoms, and a is an integer of 1 to 4). Aromatic polyester carbonate produced by polycondensation of the dicarboxylic acid component (D) to be produced, and a production method thereof.

That is, the present invention provides the following formula (5):
The present invention relates to a polycarbonate containing the repeating unit represented by (6) and (7), and a method for producing the same. The present invention also relates to a polyester carbonate containing a repeating unit represented by the following formulas (5) and (8), and a method for producing the same. The repeating units (5) to (8) are shown below.

[0016]

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(In the above formulas (5) to (8), R ¹ to
The definitions of R ⁹ , m, n, p and X are the same as in the above formulas (1) to (4). As the dihydroxy compound of the component (A) represented by the above formula (1), R ¹ and R ² in the above formula (1) each preferably have 3 to 12 carbon atoms. More preferably, the carbon number is 6 to 9 respectively. Specific examples include the following compounds.

[0018]

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[0019]

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In the present invention, examples of the dihydroxy compound represented by the above (2) include 2,2-bis (4-hydroxyphenyl) propane (hereinafter referred to as bisphenol A), bis (2-hydroxyphenyl) methane, and bis (4 -Hydroxyphenyl) methane, 1,1-bis (4
-Hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) propane, 2,2-bis (2-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane , 2,2-
Bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) pentane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl)
Examples thereof include sulfide, bis (4-hydroxyphenyl) sulfone and the like, and aromatic rings in which an alkyl group, an aryl group or the like is substituted, and these may be used alone or in combination of two or more. Among them, bisphenol A is particularly preferred.

The dihydroxy compound of the above component (C) represented by the above formula (3) includes 9-nonyl-10-
Octyl-1,18-octadecyldiol, 8-nonyl-9-octyl-1,17-heptadecyldiol,
8-octyl-9-nonyl-1,17-heptadecyldiol, 8-nonyl-9-octyl-1,18-octadecyldiol, 8-octyl-9-nonyl-1,18
-Octadecyldiol, 9-nonyl-10-octyl-1,18-octadecyldiol, 9-decyl-10
-Heptyl-1,18-octadecyldiol, 7-nonyl-8-octyl-1,18-octadecyldiol, 7-octyl-8-nonyl-1,18-octadecyldiol, 9-nonyl-10-octyl-1, 18-
Octadecyldiol, 9,10-dioctyl-1,1
8-octadecyldiol.

When the dihydroxy compound is composed of the component (A), the component (B) and the component (C), the molar ratio of the components is as follows: component (A); 0.6 to 0.01; component (B);
0.4 to 0.99, component (C); preferably 0.2 to 0.01.

Further, in order to obtain an aromatic polycarbonate having excellent thermal stability in addition to melt fluidity, the molar ratios of the components are as follows: component (A); 0.1 to 0.01, component (B); 0.9 to 0.99, component (C); 0.1 to 0.01
It is preferable that the total molar ratio of the component (A) and the component (C) is 0.1 to 0.01; the component (B);
It is preferably 0.9 to 0.99.

The dicarboxylic acid component (D) of the component (D) represented by the above formula (4) preferably has 3 to 12 carbon atoms in R ⁷ and R ⁸ in the above formula (4). In addition, from the viewpoint of cost,
9 is more preferable. Specific examples include the following compounds.

[0025]

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[0026]

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The molar ratio of the dicarboxylic acid component (D) is preferably 0.6 to 0.01 with respect to the carbonate-forming compound 1. Further, in order to obtain an aromatic polyester carbonate having excellent thermal stability in addition to the melt fluidity, the molar ratio of (D) must be adjusted so that the carbonate-forming compound 1
Is preferably 0.1 to 0.01.

In the present invention, formulas (1), (2),
The purity of the dihydroxy compound and dicarboxylic acid represented by (3) and (4) is preferably 95% or more. Formulas (1), (2), (3),
In the dihydroxy compound and dicarboxylic acid represented by (4) and (4), the corresponding monomer alcohol and trimer alcohol are contained as impurities at 1% or less, respectively. If the purity of this raw material is less than 95%, a polymer having a desired degree of polymerization and fluidity cannot be obtained, which is not preferable.

Examples of the carbonate-forming compound include phosgene and carbonic acid diester. Examples of the carbonic acid diester include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate and the like. Among them, diphenyl carbonate is preferred from the viewpoint of cost.

The polycarbonate copolymer of the present invention has an intrinsic viscosity ([η]) at 20 ° C. of a solution having a concentration of 0.5 g / dl in methylene chloride as a solvent of at least 0.5.
3 g / dl and a glass transition temperature of at least 100
° C. When [η] is less than 0.3 g / dl, the impact resistance is poor, and thus it is not preferable as a molding material. Also, depending on the glass transition temperature, the heat resistance of the molded product,
The degree of thermal stability during melt molding is evaluated, where:
In order to obtain sufficient thermal stability for molding, the glass transition temperature is preferably 100 ° C. or higher, more preferably 120 ° C. or higher. The intrinsic viscosity ([η]) at 20 ° C. of a solution having a concentration of 0.5 g / dl using methylene chloride as a solvent is 0.3 g / d.
Even if it exceeds 1, if the glass transition temperature is less than 100 ° C., it is not preferable in terms of thermal stability.

The polycarbonate resin disclosed in the present invention may be synthesized by any production method. For example, an interfacial polymerization method using phosgene as a carbonate-forming compound or a melting method using a diester carbonate (transesterification reaction). ) Or solid phase polymerization. Among these, the melting method using diallyl carbonate or the solid-phase polymerization method is preferred because harmful halides are not used, and the melting method using diester carbonate is more cost-effective and the process is simple. Is more preferred.

The melting method is carried out by heating and stirring a dihydric phenol and a carbonic acid diester under a normal pressure and / or a reduced pressure nitrogen atmosphere to distill off the produced alcohol or phenol.

In the case of the melting method, the reaction temperature varies depending on the boiling point of the product, etc., but is usually in the range of 120 to 350 ° C. in order to remove alcohol or phenol formed by the reaction. It is in the range of 180 to 280 ° C for the reason that the property is obtained.

In the latter stage of the reaction, the pressure of the system is reduced to facilitate the distillation of the alcohol or phenol formed. The internal pressure of the system at the latter stage of the reaction is preferably 1 mmHg or less, more preferably 0.5 mmHg or less.

A polymerization catalyst can be used to increase the polymerization rate. Examples of the polymerization catalyst include hydroxides of alkali metals and alkaline earth metals such as sodium hydroxide and potassium hydroxide, and hydroxides of boron and aluminum. Products, alkali metal salts, alkaline earth metal salts, quaternary ammonium salts, alkoxides of alkali metals and alkaline earth metals,
Normal esterification reaction or esterification of alkali metal or alkaline earth metal organic acid salts, zinc compounds, boron compounds, silicon compounds, germanium compounds, organotin compounds, lead compounds, antimony compounds, manganese compounds, titanium compounds, zirconium compounds, etc. Examples of the catalyst used in the exchange reaction include: The catalyst may be used alone or in combination of two or more. Among them, a catalyst combining (i) a nitrogen-containing basic compound and (ii) an alkali metal and / or alkaline earth metal compound is preferable from the viewpoint of high hue, heat stability, and high polymerization rate.

The amount of these polymerization catalysts used in the present invention is 1 * 10 1 mol per mol of the total dihydroxy compound in the case of an alkali metal compound and an alkaline earth metal compound.
^-7 to 1 * 10 ^-4 equivalents, preferably 1 * 10 ^{-7 to} 5 * 10
^-6 equivalents. When a nitrogen-containing basic compound is used, 1 * is used for 1 mol of all dihydroxy compounds.
10 ^-5 to 1 * 10 ^-3 equivalents, preferably 1 * 10 ^-5 to 1 *
It is selected in the range of 10 ^-4 equivalents.

In the present invention, it is particularly preferable to apply a catalyst deactivator after completion of the polymerization. The catalyst deactivator in the present invention deactivates part or all of the activity of the polymerization catalyst used in the production of polycarbonate.

As a method for adding the catalyst deactivator, for example, the catalyst deactivator may be added while the polycarbonate as a reaction product is in a molten state, or may be added after pelletizing the polycarbonate and then re-dissolving it. good. In the former, the polycarbonate which is a reaction product in the reaction tank or the extruder may be added while it is in a molten state, or the polycarbonate obtained after polymerization is pelletized from the reaction tank through the extruder. Meanwhile, a neutralizing agent can be added and kneaded.

The catalyst deactivator is preferably a phosphonium salt of sulfonic acid and / or a phosphonium salt of sulfonic acid, since it has a great effect on improving the physical properties such as hue, heat resistance and boiling water resistance of the obtained polymer.
Alternatively, it is preferable to use an ammonium salt of sulfonic acid. Among them, particularly preferred are tetradecylphosphonium dodecylbenzenesulfonate and tetrabutylammonium p-toluenesulfonate.

The novel copolymer of the present invention can be obtained by the above-mentioned method. In the case of molding various molded articles using the same, conventionally known antioxidants, ultraviolet absorbers and release agents are used depending on the intended use. May be added.

The copolymer of the present invention can be produced by mixing the above-mentioned components by any method, for example, using a tumbler, a blender, a Nauta mixer, a Banbury mixer, a kneading roll, an extruder, or the like.

[0042]

EFFECT OF THE INVENTION By co-polymerizing a specific dihydroxy compound component and dicarboxylic acid, polycarbonate or polyester having excellent fluidity which has not been obtained by conventional polycarbonates and having improved fluidity, especially as a material for injection molding, has been obtained. A carbonate can be obtained.

[0043]

The present invention will be further described below with reference to examples, but the present invention is not limited to these examples. The measurement of each item was performed by the following method. (1) Tg: Tg was measured by a 2000-type DSC manufactured by DuPont at a temperature rising rate of 10 ° C. per minute under a nitrogen stream. (2) Melt fluidity: The pellets were pressed under 0.5 mmHg pressure 13
After drying at 0 ° C. for 6 hours, a test load of 2160 g was applied using a melt indexer manufactured by Toyo Seiki Seisaku-sho in accordance with the flow test method for thermoplastics (JIS-K7210).
It was measured at 280 ° C. (3) Intrinsic viscosity [η]: Measured in methylene chloride at 20 ° C. with an Ubbelohde viscometer.

Example 1 Bisphenol A1 was used as a raw material in a reaction vessel equipped with a stirrer, a rectification column and a decompression device.
36.97 g (0.60 mol), 134.95 g (0.63 mol) of diphenyl carbonate, and the following formula (9)

[0045]

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A diol compound represented by the following formula (1)
0)

[0047]

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1.54 g of a mixture containing the diol compound represented by the formula (1) in a molar ratio of 3: 1 (copolymer component (a))
(2.87 mmol), bisphenol disodium salt 5.45 * 10 ^-4 g (2 micromol) as polymerization catalyst, tetramethylammonium hydroxide 9.12
* 10 ⁻³ g (100 μmol) was charged and melted at 180 ° C. under a nitrogen atmosphere. 100 m inside the reaction tank under stirring
The pressure was reduced to mHg, and the resulting phenol was distilled off.
The reaction was performed for 0 minutes. Next, after the temperature was raised to 200 ° C., the pressure was gradually reduced, and the phenol was distilled off at a pressure of 30 mmHg to 20
Allowed to react for minutes. Further, the temperature was gradually raised and reacted at 220 ° C. for 20 minutes, at 240 ° C. for 20 minutes, and at 280 ° C. for 20 minutes. Thereafter, the pressure was gradually reduced at 280 ° C. and 1 mm at 20 mmHg.
The reaction was continued for 0 minutes, 10 mmHg for 5 minutes, and finally reacted at 280 ° C / 0.5 mmHg for 2 hours. The physical properties of the obtained copolymerized polycarbonate resin were evaluated by the above methods, and the results are shown in Table 1 below.

Example 2 136. bisphenol A
95 g, 4.72 g (8.79 mmol) of a mixture (copolymer component (a)) of the diol compound represented by the above formula (9) shown in Example 1 and the diol compound represented by the above formula (10) Except for using, the same operation as in Example 1 was performed.
A copolymer polycarbonate resin was obtained. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Example 3 Bisphenol A was added to 132.
63 g (0.58 mol) of a mixture of the diol compound represented by the above formula (9) shown in Example 1 and the diol compound represented by the above formula (10) (copolymer component (a))
Was used in the same manner as in Example 1 except that 10.8 g (20.1 mmol) of was used to obtain a copolymerized polycarbonate resin. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Example 4 Bisphenol A as Raw Material
136.97 g (0.60 mol), 134.95 g (0.63 mol) of diphenyl carbonate and the following formula (11)

[0052]

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A copolymer polycarbonate resin was obtained in the same manner as in Example 1, except that 1.54 g (2.81 mmol) of the compound (copolymer component (a)) was used. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Example 5 Bisphenol A was added to 136.
95 g (0.60 mol) of the above formula (1) shown in Example 4.
4.72 of the compound represented by 1) (copolymer component (a))
g (8.60 mmol) was used, and the same operation as in Example 1 was performed to obtain a copolymerized polycarbonate resin. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Example 6 Bisphenol A was added to 136.
97 g (0.60 mol) of the above formula (1) shown in Example 4.
Compound (1) represented by 1) (copolymer component (a)) was added to 11.1
Except for using 3 g (20.3 mmol), the same operation as in Example 1 was performed to obtain a copolymerized polycarbonate resin.
The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Comparative Example 1 As a dihydroxy compound, 136.97 g of 2,2-bisphenol A (0.60 g)
Mol)), and the same operation as in Example 1 was carried out, to obtain a polycarbonate resin. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Comparative Example 2 5028 g of bisphenol A and a 7.2% aqueous hydroxide solution were placed in a 50 liter reactor equipped with a phosgene blowing tube, a thermometer and a stirrer.
1 liter and sodium hydrosulfite 9.8
g of the compound (a)
(Copolymer component (c))

[0058]

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6 g, methylene chloride (12.7 liters) and 48.5% aqueous sodium hydroxide solution (807 g) were added, and phosgene (2508 g) was added at 25 ° C. for 90 minutes to cause a phosgenation reaction. After completion of phosgenation, p-ter
175.1 g of t-butylphenol, 804 g of a 48.5% aqueous sodium hydroxide solution and 18.1 ml of triethylamine as a catalyst were added, and the mixture was stirred at 33 ° C. for 2 hours to terminate the reaction. The methylene chloride layer was separated from the reaction mixture and purified by washing with water to give a viscosity average molecular weight of 1530.
0 was obtained. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Comparative Example 3 A copolymer polycarbonate resin having a viscosity average molecular weight of 15,300 was obtained in the same manner as in Comparative Example 2 except that the amount of the copolymer component (C) was changed to 30 g. The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

Comparative Example 4 A copolymer polycarbonate resin having a viscosity average molecular weight of 15300 was obtained in the same manner as in Comparative Example 2 except that the amount of the copolymer component (C) was changed to 3 g.
The physical properties of this polymer were evaluated by the above methods, and the results are shown in Table 1 below.

[0062]

[Table 1]

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Katsushi Sasaki 2-1 Hinodecho, Iwakuni-shi, Yamaguchi Prefecture F-term in the Iwakuni Research Center, Teijin Limited 4J029 AA08 AA09 AB04 AC02 AD01 AD07 AE01 BA01 BA02 BA07 BB12A BB12B BB13A BB13B BD06C BD09A BD09B BG08X BH02 CD04 DB07 DB13 HB01 HC01 HC04A HC05A HC05B JA061 JA091 JA121 JA161 JA201 JA261 JA301 JB131 JB171 JC091 JC373 JC633 JF031 JF041 JF111 JF121 JF12 J361

Claims (9)

[Claims] [Claim 1] The following formula (1) (R ¹ and R ² each independently represent an alkylene group having 1 to 20 carbon atoms, R ³ represents an alkyl group having 1 to 20 carbon atoms, and p represents an integer of 1 to 4). A compound (component (A)) and a compound represented by the following formula (2): (Wherein R ⁴ and R ⁵ are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, Represents an aryl group having 20; a cycloalkoxy group having 6 to 20 carbon atoms; or an aryloxy group having 6 to 20 carbon atoms, m and n are each independently an integer of 1 to 4. X is a single bond or an oxygen atom , A carbonyl group, an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 6 to 20 carbon atoms, or an arylene group having 6 to 20 carbon atoms) (component (B)). A polycarbonate produced by polycondensation of a compound and a carbonate-forming compound, wherein the intrinsic viscosity at 20 ° C. of a 0.5 g / dl concentration solution using methylene chloride as a solvent is small. Is an aromatic polycarbonate having an excellent melt flowability of 0.3 g / dl and a glass transition temperature of at least 100 ° C. 2. The dihydroxy compound further comprises the following formula (3): HO—R ⁶ —OH (3) (wherein, R ⁶ represents an alkyl group having 1 to 40 carbon atoms).
2. A component (C) represented by the formula:
3. The aromatic polycarbonate according to item 1. 3. The following formula (2): A dihydroxy compound (component (B)), a carbonate-forming compound, and a compound represented by the following formula (4): (Wherein, R ⁷ and R ⁸ each independently have 1 to 20 carbon atoms)
R ⁹ is an alkyl group having 1 to 20 carbon atoms,
a represents an integer of 1 to 4. An aromatic polyester carbonate comprising a dicarboxylic acid component (component (D)) represented by the following formula: 4. The following formula (1): (R ¹ and R ² each independently represent an alkylene group having 1 to 20 carbon atoms, R ³ represents an alkyl group having 1 to 20 carbon atoms, and p represents an integer of 1 to 4). A) Component, the following formula (2) (In the formula, R ⁴ and R ⁵ are each independently a hydrogen atom or an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, and 6 to 20 carbon atoms. , A cycloalkoxy group having 6 to 20 carbon atoms, or an aryloxy group having 6 to 20 carbon atoms, and m and n are each independently an integer of 1 to 4.
X represents a single bond, an oxygen atom, a carbonyl group,
Represents an alkylene group having 20 to 20 carbon atoms, a cycloalkylene group having 6 to 20 carbon atoms, or an arylene group having 6 to 20 carbon atoms. ) And / or the following formula (3): HO—R ⁶ —OH (3) (wherein R ⁶ represents an alkyl group having 1 to 40 carbon atoms) Represents.)
A dihydroxy compound comprising the component (C) represented by
A method for producing a polycarbonate by melt-polycondensing a carbonate-forming compound. 5. The following formula (2): A dihydroxy compound (component (B)), a carbonate-forming compound, and a compound represented by the following formula (4): (Wherein, R ⁷ and R ⁸ are each independently an alkylene group having 1 to 20 carbon atoms, R ⁹ is an alkyl group having 1 to 20 carbon atoms, and a is an integer of 1 to 4). A method for producing a polyester carbonate by melt polycondensation with an acid component (D). 6. The method according to claim 4, wherein the purity of the dihydroxy compound is 95% or more. 7. The production method according to claim 5, wherein the purity of the dicarboxylic acid component is 95% or more. 8. The method according to claim 4, wherein a polyhydroxy compound, a carbonic acid diester, and / or a dicarboxylic acid component is melt-polycondensed in the presence of a polymerization catalyst, and a catalyst deactivator is added after completion of the polymerization. The production method according to any one of the above. 9. The process according to claim 8, wherein the polymerization catalyst is (i) a nitrogen-containing basic compound and / or (ii) an alkali metal or alkaline earth metal compound.