JP2001081179A - Production of aromatic polycarbonate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a polycarbonate having an excellent hue by a melt condensation polymerization and excellent long-term stability, to obtain an aromatic polycarbonate resin having improved melt viscosity stability, suitable for an optical disc substrate and the optical disc substrate from the aromatic polycarbonate resin. SOLUTION: In this method for producing an aromatic polycarbonate by subjecting a dihydroxy compound consisting essentially of 2,2-bis(4- hydroxyphenyl)propane and an aromatic carbonic acid ester consisting essentially of diphenyl carbonate in the presence of a basic transesterification catalyst, 2,2-bis(4-hydroxyphenyl)propane has a crystal structure of orthorhombic system. After the melt condensation polymerization, the polycarbonate is formulated with a catalyst deactivator to give an aromatic polycarbonate resin having <=0.5% melt viscosity stability, which is molded into a disc substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aromatic polycarbonate having a good color tone.
The present invention relates to a method for producing an aromatic polycarbonate having a good color tone by using 2,2-bis (4-hydroxyphenyl) propane (hereinafter, bisphenol A) having a specific crystal structure.

Further, bisphenol A having the specific crystal structure
The present invention relates to a method for producing a polycarbonate having good color tone and good long-term stability by blending a catalyst deactivator with an aromatic polycarbonate produced by the method.

Further, the present invention relates to an aromatic polycarbonate resin suitable for an optical disk substrate having improved melt viscosity stability, and an optical disk substrate made of the aromatic polycarbonate resin.

[0004]

2. Description of the Related Art Polycarbonate resins have excellent optical properties, electrical properties, and dimensional stability, and are self-extinguishing.
In addition, it has excellent mechanical properties such as impact resistance, and also has excellent properties such as heat resistance and transparency. Therefore, it is widely used in a wide range of applications.

As a method for producing such a polycarbonate resin, a method of directly reacting phosgene with an aromatic dihydroxy compound such as 2,2-bis (4-hydroxyphenyl) propane: (interfacial polymerization method); −
Method for transesterifying an aromatic dihydroxy compound such as bis (4-hydroxyphenyl) propane with an aromatic carbonate such as diphenyl carbonate in a molten state:
(Melting method) and the like are known.

[0006] Among such production methods, a method based on a transesterification reaction (melting method) between an aromatic dihydroxy compound and a carbonic acid diester uses a toxic halogen compound such as phosgene or methylene chloride as a solvent compared with the interfacial polymerization method. There is no problem of using polycarbonate, and there is an advantage that polycarbonate can be produced at low cost, and it is considered that it is promising in the future.

[0007] In the process of producing a melt polycarbonate by transesterification, a transesterification catalyst, particularly a basic transesterification catalyst, is usually used in order to increase the production efficiency. Plastic Materials Course 17 Polycarbonate 48
~ 53 pages Nikkan Kogyo Shimbun Toshihisa Tachikawa, Shoichi Sakajiri

Among these transesterification catalysts, a catalyst system using a basic nitrogen compound or a basic phosphorus compound in combination with an alkali metal compound has good polycarbonate productivity and physical properties such as color tone of the obtained polycarbonate. Is preferable, since there is little generation of a branched structure in the polymer molecule and the polycarbonate has good physical properties such as melt fluidity.

As a method for purifying an aromatic dihydroxy compound such as 2,2-bis (4-hydroxyphenyl) propane as a raw material, JP-A-5-132441 can be mentioned. However, these patents disclose that the polycarbonate raw material 2,2-bis (4-hydroxyphenyl) propane is purified to obtain an orthorhombic crystal structure, which is important for polycarbonate preparation. There is no suggestion about the reaction conditions of polycarbonate, catalyst, catalyst deactivator, etc. to obtain a polycarbonate resin suitable for an optical disk substrate by a melt polymerization method. There is no mention or suggestion of improving viscosity stability.

[0010]

However, since the melt-polymerized polycarbonate uses an alkali metal compound and / or another metal compound as a transesterification catalyst, and further performs melt polycondensation under a high temperature condition, the Compared to those produced by the interfacial polymerization method, the color tone is stronger yellow, and since it produces and contains by-products or impurities, it has poor long-term stability and is problematic for sale as a commercial product. In particular, for an optical disk substrate used as a data recording material, the problem of long-term stability of the substrate is one of the causes of problems in long-term storage of information.
In order to solve this problem, catalyst, reaction method, reactor material,
Studies have been made from many viewpoints such as impurities in raw materials and various stabilizers, but no satisfactory solution has been found yet.

[0011]

In order to improve the color tone and the long-term stability of a polycarbonate produced by a melt polymerization method, the present inventors have developed catalysts, reactor materials, reaction conditions, raw material impurities, and various stabilizers. The research has been repeated, but by using bisphenol A as a raw material having an orthorhombic crystal structure and using a specific type and amount of catalyst as a catalyst, the color tone of the obtained polycarbonate can be adjusted. The present inventors have found that they can be improved until they can be commercialized, and have reached the present invention.

Further, by blending a specific catalyst deactivator with the polycarbonate and adjusting the melt viscosity stability to a specific value or less, the long-term stability of the polycarbonate resin can be improved. The invented polycarbonate resin was found to be suitable for an optical disk substrate, and reached the present invention.

That is, the present invention relates to a process for converting a dihydroxy compound containing 2,2-bis (4-hydroxyphenyl) propane as a main component and an aromatic carbonate containing diphenyl carbonate as a main component in the presence of a basic transesterification catalyst. The present invention relates to a method for producing an aromatic polycarbonate, which is characterized in that the 2,2-bis (4-hydroxyphenyl) propane has an orthorhombic crystal structure when producing an aromatic polycarbonate by melt polycondensation.

More specifically, the basic transesterification catalyst is a catalyst containing (A) a basic nitrogen compound or a basic phosphorus compound and (A) an alkali metal compound, and (A) a basic nitrogen compound or a basic When the phosphorus compound is basic nitrogen or phosphorus, 2,2-bis (4-
(Hydroxyphenyl) 10 to 50 per mole of propane
Aromatic polycarbonate, characterized in that 0 micromol and (a) an alkali metal compound is used as an alkali metal element in an amount of 0.01 to 5 microequivalents per mol of 2,2-bis (4-hydroxyphenyl) propane. A method for producing the same.

More specifically, the present invention relates to a method for producing an aromatic polycarbonate having a melt viscosity stability of 0.5% or less by blending with a catalyst deactivator after melt polycondensation by the above method.

More specifically, preferably, the catalyst deactivator is at least one compound selected from the group consisting of phosphonium sulfonate, ammonium sulfonate, and sulfonate, wherein the catalyst deactivator is The present invention relates to a method for producing an aromatic polycarbonate, characterized in that 0.5 to 30 chemical equivalents are used per 1 chemical equivalent of an alkali metal element of an alkali metal compound using as a transesterification catalyst.

According to the above production method, the melt viscosity stability is 0.5
% Or less, it has been found that the long-term stability of the polycarbonate resin can be improved, and that the polycarbonate resin with further improved long-term stability is suitable for an optical disk substrate.

That is, another object of the present invention is to provide a dihydroxy compound having 2,2-bis (4-hydroxyphenyl) propane as a main component having an orthorhombic crystal structure and an aromatic compound having diphenyl carbonate as a main component. A disk having a melt viscosity of 0.5% or less obtained by blending an aromatic polycarbonate obtained by melt polycondensation with a carbonate ester in the presence of a basic transesterification catalyst and a catalyst deactivator. It is to propose an aromatic polycarbonate resin for molding a substrate.

Still another object of the present invention is to propose an optical disk substrate formed from the above-mentioned aromatic polycarbonate resin.

The polycarbonate in the present invention comprises an orthorhombic aromatic dihydroxy compound, ie, 2,2-bis (4-hydroxyphenyl) propane and an aromatic carbonate, ie, diphenyl carbonate, as main raw materials. The main unit is a repeating unit represented by the formula (1).

[0021]

Embedded image

In the present invention, as the crystal structure of 2,2-bis (4-hydroxyphenyl) propane, a monoclinic system is known in addition to the orthorhombic system.
As a result of examining the relationship between the crystal system of 2,2-bis (4-hydroxyphenyl) propane as a raw material and the color tone of a melt-polymerized polycarbonate using a specific catalyst system,
It was found that when 2,2-bis (4-hydroxyphenyl) propane belonging to the orthorhombic system was used, the resulting polycarbonate had good color tone.

When using orthorhombic 2,2-bis (4-hydroxyphenyl) propane, it is not clear why the color tone of the polymer becomes good. It is estimated that there may be a difference in the surface activity to be adsorbed.

As a method for obtaining orthorhombic 2,2-bis (4-hydroxyphenyl) propane, for example, a method for purifying 2,2-bis (4-hydroxyphenyl) propane by fractional melt crystallization, 2,2-bis (4-
After obtaining a crystalline adduct of (hydroxyphenyl) propane,
A method of decomposing and purifying a crystal adduct is exemplified.

In the present invention, in addition to the above-mentioned 2,2-bis (4-hydroxyphenyl) propane, a small amount of an aliphatic or aromatic dihydroxy compound, dicarboxylic acid, or oxyacid optionally having a substituent may be used. For various purposes, for example, control of glass transition temperature, or control of optical properties such as improvement of fluidity, increase of refractive index, or reduction of birefringence, one or various kinds of monomers may be used as necessary. It goes without saying that two or more kinds can be contained.

As such aromatic dihydroxy compounds, specifically, bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-) Methylphenyl) propane, 2,2-bis (4-hydroxyphenyl) heptane, 2,2-bis (4-hydroxy-3,5
-Dichlorophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, bis (4-hydroxyphenyl) ether, bis (4-hydroxy-3,5-dichlorophenyl) ether, 4,
4'-dihydroxydiphenyl, 3,3-dichloro-4,4'-dihydroxydiphenyl, bis (4-hydroxyphenyl) sulfone, resorcinol, hydroquinone, 1,4-dihydroxy-2,5-dichlorobenzene, 1,4-dihydroxy -3-methylbenzene, bis (4-hydroxyphenyl) sulfide, bis (4-hydroxyphenyl) sulfoxide and the like.

Examples of the aliphatic dihydroxy compound include ethylene glycol, 1,4-butanediol, 1,4
-Cyclohexanedimethanol, 2,2-dimethyl-1,3-propanediol, 1,10-decanediol, diethylene glycol, tetraethylene glycol, polyethylene glycol, polytetramethylene glycol and the like.

Examples of the dicarboxylic acids include succinic acid, isophthalic acid, 2,6-naphthalenedicaubonic acid,
Adipic acid, cyclohexanedicarboxylic acid, terephthalic acid, and oxyacids include, for example, p-hydroxybenzoic acid, 6-hydroxy-2 naphthoic acid, lactic acid, and the like.

Specific examples of the aromatic carbonate include, in addition to diphenyl carbonate, ditolyl carbonate, bis (2-chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, and bis (4-phenylphenyl) carbonate And the like. In addition, it goes without saying that dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate and the like can be used as desired. Of these, diphenyl carbonate is mentioned as a preferable one in terms of reactivity, stability against coloring of the obtained resin, and further from the viewpoint of cost.

The catalyst system, as already described,
A catalyst system containing (a) a basic nitrogen compound or a basic phosphorus compound and (b) an alkali metal compound is used. The amount of the alkali metal used is 0.01 to 5 per mole of the aromatic dihydroxy compound. It is preferable to keep the microequivalent. By using the amount of the alkali metal element derived from the catalyst system in the polycarbonate resin in such an amount range, the production of the polycarbonate can be efficiently performed with good productivity, and the physical properties of the obtained polycarbonate also achieve the objects of the present invention. Therefore, it is preferable.

The alkali metal compound used in the present invention as a catalyst includes, for example, an alkali metal hydroxide,
Hydrocarbon compounds, carbonates, acetates, nitrates, nitrites,
Examples include sulfites, cyanates, thiocyanates, stearates, borohydrides, benzoates, borohydrides, bisphenol salts, and phenol salts.

Specific examples include sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, sodium carbonate, potassium carbonate, lithium carbonate, cesium carbonate, sodium acetate, potassium acetate, and acetic acid. Lithium, sodium nitrate,
Potassium nitrate, rubidium nitrate, lithium nitrate, sodium nitrite, potassium nitrite, rubidium nitrite, lithium nitrite, sodium sulfite, potassium sulfite, lithium sulfite, sodium cyanate, potassium cyanate,
Lithium cyanate, sodium thiocyanate, potassium thiocyanate, lithium thiocyanate, cesium thiocyanate, sodium stearate, potassium stearate, lithium stearate, cesium stearate, sodium borohydride, potassium borohydride, lithium borohydride , Sodium phenylated, sodium benzoate, potassium benzoate, lithium benzoate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, dilithium hydrogen phosphate, disodium salt of bisphenol A, dipotassium salt, dilithium salt, monosodium salt , Monopotassium salt, sodium potassium salt, sodium lithium salt,
And phenol sodium salts, potassium salts and lithium salts.

The alkali metal compound used as a catalyst is used in an amount of 0.01 to 5 microequivalents as an alkali metal element per mole of the aromatic dihydroxy compound. In the above sense, it is more preferably used in the range of 0.05 to 5 microequivalents. More preferably 0.0
Used in the range of 8-4 microequivalents. If the ratio is out of the above range, various properties of the obtained polycarbonate are adversely affected, and a transesterification reaction does not sufficiently proceed to obtain a high molecular weight polycarbonate, which is not preferable.

Examples of the nitrogen-containing basic compound used as a catalyst include, for example, tetramethylammonium hydroxide (Me ₄ NOH), tetraethylammonium hydroxide (Et ₄ NOH), tetrabutylammonium hydroxide (Bu ₄ NOH), Benzyltrimethylammonium hydroxide (φ-CH ₂ (Me) ₃ NO
H) and ammonium hydroxides having alkyl, aryl, alkylaryl groups such as hexadecyltrimethylammonium hydroxide, tetramethylammonium acetate, tetraethylammonium propionate, tetrabutylammonium lactate, benzyltrimethylammonium acetate, hexa Ammonium carboxylates having alkyl, aryl, alkylaryl groups and the like, such as decyltrimethylammonium benzoate and tetramethylammonium carbonate, and ammonium carbonates, triethylamine, tributylamine, dimethylbenzylamine, hexadecyldimethylamine and the like. Tertiary amine,
Tetramethylammonium borohydride (Me ₄ N
BH ₄ ), tetrabutylammonium borohydride (Bu ₄ NBH ₄ ), tetrabutylammonium tetraphenylborate (Bu ₄ NBPh ₄ ), and tetramethylammonium traphenylborate (Me ₄ NBP)
h ₄₎ and the like basic salts such as.

The basic phosphorus compound used as a catalyst includes tetramethylphosphonium hydroxide,
Alkyls such as tetraethylphosphonium hydroxide, tetrabutylphosphonium hydroxide, benzyltrimethylphosphonium hydroxide, and hexadecyltrimethylphosphonium hydroxide, aryl, phosphonium hydroxides having an alkylaryl group,
Phosphonium carboxylates having alkyl, aryl, alkylaryl groups and the like such as tetramethylphosphonium acetate, tetraethylphosphonium propionate, tetrabutylphosphonium lactate, benzyltrimethylphosphonium acetate, hexadecylphosphonium benzoate, and tetramethylphosphonium carbonate And phosphonium carbonates, or basic salts such as tetramethylphosphonium borohydride, tetrabutylphosphonium borohydride, tetrabutylphosphonium tetraphenylborate, and tetramethylphosphonium traphenylborate.

The basic nitrogen compound and the basic phosphorus compound are those in which the basic nitrogen compound and the basic nitrogen and phosphorus atoms in the basic phosphorus compound are 10 to 500 microequivalents per mole of the aromatic dihydroxy compound. It is preferable to use them. A more preferable usage ratio is 20 for the same standard.
It is a ratio that becomes ~ 500 microequivalents. A particularly preferred ratio is a ratio that results in 50 to 300 microequivalents with respect to the same standard. In the case of a basic nitrogen compound, when one basic nitrogen element (monovalent) is contained in one molecule, one mole of the catalyst is equivalent to one equivalent of the catalyst. For example, 1 mole of tetramethylammonium hydroxide (Me ₄ NOH)
Equivalent. In the case of a basic phosphorus compound, when one basic phosphorus element (monovalent) is contained in one molecule, one mole of the catalyst is equivalent to one equivalent of the catalyst. For example, one mole of tetramethylphosphonium hydroxide (Me ₄ POH) is equivalent to one equivalent of the catalyst.

In the method of the present invention, a specific salicylic acid ester is allowed to act on the polycarbonate after a predetermined degree of polymerization is reached during the melt polycondensation of the polycarbonate.
The H terminal group can be suitably reduced.

That is, the OH terminal group concentration of the polycarbonate having reached a predetermined degree of polymerization was measured by an NMR spectrometer,
The above salicylate is added in an amount of 0.7
The OH group concentration in the polycarbonate is adjusted to 30 eq / to by reacting 10 to 10 mol, particularly preferably 1 to 2 mol.
n or less, particularly preferably 20 eq / ton or less. This can preferably reduce the coloring when the polycarbonate is maintained at a high temperature in the air,
Specific examples of these salicylates include 2-methoxycarbonylphenyl-phenyl carbonate, 2
-Methoxycarbonylphenyl-2-methylphenyl carbonate, 2-methoxycarbonylphenyl-4-ethylphenyl carbonate, 2-methoxycarbonylphenyl-3'-butylphenyl carbonate, 2-methoxycarbonylphenyl-4-dodecylphenyl carbonate, 2- Methoxycarbonylphenyl-4'-hexadecylphenylcarbonate, 2-methoxycarbonylphenyl-2 ', 4'dibutylphenylcarbonate, 2-methoxycarbonylphenyldinonylphenylcarbonate, 2-methoxycarbonylphenyl-cyclohexylphenylcarbonate, 2-methoxy Carbonylphenyl-biphenyl carbonate, 2-methoxycarbonylphenyl-cumylphenyl carbonate,
2-methoxycarbonylphenyl-2'-methoxyphenylcarbonate, 2-methoxycarbonylphenyl-
4'-butoxyphenyl carbonate, 2-methoxycarbonylphenyl-4'-cumyloxyphenyl carbonate, di (2-methoxycarbonylphenyl) carbonate, 2-methoxycarbonylphenyl-2-ethoxyphenylcarbonate, and 2-methoxycarbonylphenyl 2-methoxycarbonylphenylaryl carbonates such as -2 '-(O-methoxycarbonylphenyl) oxycumylphenyl carbonate;

2-methoxycarbonylphenyl-methyl carbonate, 2-methoxycarbonylphenyl-butyl carbonate, 2-methoxycarbonylphenyl-cetyl carbonate, 2-methoxycarbonylphenyl-
2-methoxycarbonylphenyl-alkyl carbonates such as lauryl carbonate, 2-methoxycarbonylphenyl-2'-ethoxycarbonylethyl carbonate, and 2-methoxycarbonylphenyl-2 '-(O-methoxycarbonylphenyl) oxycarbonylethyl carbonate;

2-ethoxycarbonylphenyl-phenylcarbonate, 2-ethoxycarbonylphenyl-propylphenylcarbonate, 2-ethoxycarbonylphenyl-hexylphenylcarbonate, 2-ethoxycarbonylphenyl-dibutylphenylcarbonate, 2-ethoxycarbonylphenyl-dinonyl Phenyl carbonate, 2-ethoxycarbonylphenyl-cyclohexylphenyl carbonate, 2-ethoxycarbonylphenyl-cumylphenyl carbonate, 2-ethoxycarbonylphenyl-4′-ethoxycarbonylphenylcarbonate, 2-ethoxycarbonylphenyl-4′-cumyloxy Phenyl carbonate, 2-ethoxycarbonylphenyl-carbonate, and di (2-ethoxycarboni Phenyl) carbonate, such as 2-ethoxycarbonyl-phenyl chromatography aryl carbonates;

2-ethoxycarbonylphenyl-methyl carbonate, 2-ethoxycarbonylphenyl-octyl carbonate, 2-ethoxycarbonylphenyl-
2'-methoxycarbonylethyl carbonate, 2-ethoxycarbonylphenyl-carbonate, and 2-
2-ethoxycarbonylphenyl-alkyl carbonates such as ethoxycarbonylphenyl-2- (O-ethoxycarbonylphenyl) oxycarbonylethyl carbonate;

(2-methoxycarbonylphenyl) benzoate, (2-methoxycarbonylphenyl) -4-
Methyl benzoate, (2-methoxycarbonylphenyl) -4-butylbenzoate, (2-methoxycarbonylphenyl) -4-cumylbenzoate, (2-methoxycarbonylphenyl) -4-butoxybenzoate, (2-methoxycarbonylphenyl) -2-methoxycarbonylbenzoate, (2-methoxycarbonylphenyl) -4-methoxycarbonylbenzoate,
(2-methoxycarbonylphenyl) -4-ethoxycarbonylbenzoate, 3- (O-methoxycarbonylphenyl) oxycarbonylbenzoic acid (2'-methoxycarbonylphenyl) ester, and 4- (O-ethoxycarbonylphenyl) oxycarbonylbenzoate (2-methoxycarbonylphenyl) ester of aromatic carboxylic acid, such as acid (2'-methoxycarbonylphenyl) ester;

(2-ethoxycarbonylphenyl) benzoate, (2-ethoxycarbonylphenyl) -4-
Methyl benzoate, (2-ethoxycarbonylphenyl) -4-butylbenzoate, (2-ethoxycarbonylphenyl) -4-nonylbenzoate, (2-ethoxycarbonylphenyl) -4-cumylbenzoate,
(2-ethoxycarbonylphenyl) -4-methoxybenzoate, (2-ethoxycarbonylphenyl) -4
(2'-ethoxycarbonylphenyl) esters of aromatic carboxylic acids such as -nonyloxybenzoate, (2-ethoxycarbonylphenyl) -4-cumyloxybenzoate, and (2-ethoxycarbonylphenyl) -4-ethoxycarbonylbenzoate ;

(2-methoxycarbonylphenyl) acetate, (2-methoxycarbonylphenyl) stearate, (2-methoxycarbonylphenyl) oleate,
And aliphatic carboxylic acid esters such as (2-ethoxycarbonylphenyl) cyclohexanecarboxylic acid ester, bis (2-methoxycarbonylphenyl) succinate, and bis (2-methoxycarbonylphenyl) adipate.

In the present invention, it is preferable to reduce the melt viscosity stability of the polycarbonate to 0.5% or less at the time of completion of the melt polycondensation or at a subsequent stage. By such treatment, the stability of the polycarbonate resin under hydrolysis conditions, particularly the long-term stability in a hydrolyzable atmosphere can be preferably improved. That is, when a polycarbonate resin is produced by a transesterification method,
In particular, under an atmosphere in which an atmosphere in which water droplets are condensed on a molded article surface of the resin and a dried atmosphere are alternately passed,
When light is applied to a polycarbonate resin molded product, a minute defect that glitters may be generated. When such a defect occurs, the optical disc substrate is determined to be fatal.

However, it is possible to suppress the occurrence of such defects by blending a specific catalyst deactivator and making the melt viscosity stability 0.5% or less. In particular, in the polycarbonate resin of the present invention, for unknown reasons, this effect is remarkably exhibited.

In the present invention, it is preferable to reduce the residual melting activity of the polycarbonate to 0.5% or less at the time of completion of the melt polycondensation or at a subsequent stage. By such treatment, the stability of the polycarbonate resin under hydrolysis conditions can be preferably improved. In order to achieve this object, one or more of a sulfonate, a phosphonium sulfonate, or an ammonium salt is used in an amount of 0.5 to 0.5 per chemical equivalent of an alkali metal element of an alkali metal compound used as a transesterification catalyst.
It can be achieved by reacting 30 chemical equivalents, more preferably 0.9 to 10 chemical equivalents. Among them, phosphonium sulfonate has a high effect and is preferably used.

The phosphonium sulfonate or ammonium salt used in the present invention is

[0049]

A ¹ -(-SO ₃ X ¹ ) _m (I) (where A ¹ is an m-valent hydrocarbon group which may have a substituent, X ¹ is ammonium, Or m is an integer of 1 to 4. Here, the ammonium cation and the phosphonium cation

[0050]

+ N (R ¹ ) (R ² ) (R ³ ) (R ⁴ ) (Ia) + P (R ¹ ) (R ² ) (R ³ ) (R ⁴ ) (Ib) (Wherein R ^{1 to} R ⁴ are each independently a hydrogen atom or a monovalent hydrocarbon group).

[0051]

Embedded image _{^{+ X 2 -A 2 -SO 3 -}} ··· (II) (. Wherein A ² is a divalent hydrocarbon group, ⁺ X ² is an ammonium or phosphonium cation,) where Ammonium or phosphonium cations

[0052]

-N ⁺ (R ⁵ ) (R ⁶ ) (R ⁷ ) (IIa) -P ⁺ (R ⁵ ) (R ⁶ ) (R ⁷ ) (IIb) (where R ^{5 to} R ⁷ are each independently a hydrogen atom or a monovalent hydrocarbon group.).

[0053]

Embedded image A ³ -( ⁺ X ³ ) n · (R—SO ₃ ⁻ ) n (III) (where A ³ is an n-valent hydrocarbon group, and X ³ is ammonium or phosphonium A cation, where n is 2 to 4
Is an integer. Here, examples of the ammonium or phosphonium cation include those represented by (IIa) or (IIb). )

Specific examples of the compound represented by the above formula (I) include, for example: tetrabutylphosphonium octylsulfonate, tetraphosphonium decylsulfonate, tetramethylphosphonium benzenesulfonate, tetrabutylbenzenesulfonate Phosphonium salts,
Tetrabutylphosphonium dodecylbenzenesulfonate, tetrahexylphosphonium dodecylbenzenesulfonate, tetraoctylphosphonium dodecylbenzenesulfonate, tetramethylammonium decylsulfonate, tetraethylammonium benzenesulfonate, tetrabutylammonium dodecylbenzenesulfonate ^{_{, - SO 3 - (CH 2}} ) 3 -P + (C 2 H 5) 3, - S
_{O 3 - (CH 2) 15} -P + (C 4 H 9) 3, - SO 3 - (C
H ₂ ) ₁₅ −N ⁺ (C ₄ H ₉ ) ₃ , ｛(C ₄ H ₉ ) ₃ P ⁺ − (C
^{_{H 2) 10 -P + (C}} 4 H 9) 3}, and (CH ₃ -C ₆ H ₄ -
SO ₃ ^-) ₂ and so on.

Examples of the sulfonic acid ester usable in the present invention include methyl decane sulfonate, butyl decane sulfonate, pentyl nonane sulfonate, ethyl dodecyl sulfonate, nonyl hexadecyl sulfonate, methyl benzene sulfonate, and toluene sulfonic acid. Butyl, t
-Octyl butylbenzenesulfonate, 2,4-di-t
-Propyl butylsulfonate, butyl dodecylbenzenesulfonate, ethyl hexadecylbenzenesulfonate, nonyl naphthalenesulfonate, pentyl diphenylsulfonate and the like.

In the present invention, in order to produce a stabilized polycarbonate composition, it is preferred to add 0.001 to 10 parts by weight of a resin property improving agent per 100 parts by weight of the polycarbonate resin. As the resin property improver used in the present invention, for example, phosphorus-based antioxidants, phenol-based antioxidants, and higher fatty acid esters are the first target, but other commonly used resin property improvers It does not limit the use of.

What is important for achieving the object of the invention is that
The purpose is to keep the content of acidic substances in these resin property improvers to a low level. That is, the acid value of these agents is 10e
It is necessary to keep q / ton or less to achieve the object of the present invention. The acid value of such an agent is 10 eq / ton
To achieve the following, a suitable low-boiling organic solvent, in particular, having a boiling point of 15
0 ° C. or lower, more preferably 100 ° C. or lower, room temperature or higher,
More preferably, it can be easily achieved by dissolving in an inert solvent at 30 ° C. or higher, for example, acetone, tetrahydrofuran, methyl ethyl ketone, etc., treating with an ion exchange resin and removing the solvent under reduced pressure.

Examples of the phosphorus acid value inhibitor used in the present invention include: bis (2,3-di-t-butylphenyl) pentaerythrityl diphosphite and bis (2,6-di-
t-butyl-4-methylphenyl) pentaerythrityl diphosphite, bis (nonylphenyl) pentaerythrityl diphosphite, diphenyldecyl phosphite, diphenylisooctyl phosphite, phenyl diisooctyl phosphite, 2-ethylhexyl diphenyl Phosphite, tetraphenylpropylene glycol diphosphite, tetra (tridecyl) -4,4'-
Isopropylidene diphenyl diphosphite, 2,2-
Methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, and 2- {2,4,8,10-
Tetrakis (1,1-dimethylethyl) dibenzo ｛d,
f {1,3,2} dioxaphosphepin 6-yl}
Oxy} -N, N-bis {2-} 2,4,8,10-
Tetrakis (1,1 dimethylethyl) dibenzo ｛d,
f {1,3,2} dioxaphosphepin 6-yl}
Arylalkyl phosphites such as oxy {-ethyl} ethanamine,

Trimethyl phosphite, triethyl phosphite, tributyl phosphite, trimeoctyl phosphite, trinonyl phosphite, tridecyl phosphite, trioctadecyl phosphite, distearyl pentaerythyl diphosphite, bis (tridecyl) pentaeryth Lityl diphosphite, tris (2-
Chloroethyl) phosphite, and tris (2,3-
Trialkyl phosphites such as dichloropropyl) phosphite, and tricycloalkyl phosphites such as tricyclohexyl phosphite; triphenyl phosphite, tricresyl phosphite, tris (ethylphenyl) phosphite, tris (2,4 Triarylphosphites such as -di-t-butylphenyl) phosphite, tris (nonylphenyl) phosphite and tris (hydroxyphenyl) phosphite, pentaerythrityl phosphite polymer of hydrogenated bisphenol-A, triethyl phosphate , Tributyl phosphate, trioctyl phosphate, tridecyl phosphate, trioctadecyl phosphate, distearyl pentaerythrityl diphosphate, tris (2-chloroethyl) phosphate And trialkyl phosphates such as tris (2,3-dichloropropyl) phosphate; tricycloalkyl phosphates such as tricyclohexyl phosphite; and triphenyl phosphate, tricresyl phosphate, tris (ethylphenyl) phosphate, tris (2,4-di-tert-butylphenyl) phosphate and triarylphosphates such as tris (nonylphenyl) phosphate and tris (hydroxyphenyl) phosphate; tetrakis (2,4-di-tert-butylphenyl) -4,4 -Phosphites such as -biphenylenediphosphonite and tetrakis (2,4-di-t-butylphenyl) 4,4'-phenylenediphosphinate. These may be used alone or as a mixture of two or more.

Examples of the phenolic acid value inhibitor include n-octadecyl-3- (4'-hydroxy-3 ', 5
-Di-t-butylphenyl) propionate, tetrakismethylene-3- (3 ', 5-di-t-butyl-4-
(Hydroxyphenyl) propionate @ methane, 1,
1,3-tris (2-methyl-4-hydroxy-5-t
-Butylphenyl) butane, distearyl (4-hydroxy-3-methyl-5-t-butylbenzyl) malonate, triethylene glycol-bis {3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate} , 1,6-hexanediol-bis {3- (3,
5-di-t-butyl-4-hydroxyphenyl) propionate {, 2,4-bis- (n-octylthio) -6
-(4-hydroxyphenyl-3,5-di-t-butyl-anilino) -1,3,5-triazine, pentaerythrityl-tetrakis-3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate {, 2,2-
Thiodiethylenebis {3- (3,5-di-t-butyl-
4-hydroxyphenyl) propionate {, 2,2-
Thiobis (4-methyl-6-t-butylphenol),
N, N'-hexamethylenebis (3,5-di-t-butyl-4-hydroxy-hydrocinnamamide), 3,5-
Di-t-butyl-4-hydroxybenzylphosphonate diethyl ester, 1,3,5-trimethyl-2,
4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, bis (3,5-di-tert-butyl-4-hydroxybenzylethyl sulfonate) calcium, tris (3 , 5-Di-tert-butyl-4-hydroxybenzyl) -isocyanurate, 2,4-bis {(octylthio) methyl} -O-cresol, isooctyl-3- (3,5-di-tert-butyl-4-hydroxy) Phenyl) propionate, 2,5,7,8-tetramethyl-2 (4 ′, 8,12-trimethyltridecyl)
Chroman-6-ol, N, N'-bis {3- (3,5
-Di-t-butyl-4-hydroxyphenyl) propionyl} hydrazine, and 4-hydroxymethyl-2,
6-di-t-butylphenol and the like. These may be used alone or as a mixture of two or more.

As the release agent used in the present invention, conventionally known release agents can be favorably used. For example, an ester of an aliphatic carboxylic acid and an alcohol can be preferably used. Saturated or unsaturated monohydric alcohols such as, for example, saturated or unsaturated aliphatic mono-, di- or tricarboxylic acids and ethanol, butanol, or stearyl alcohol;
Saturated or unsaturated dihydric alcohols such as ethylene glycol, 1,4-butenediol or diethylene glycol, or saturated or unsaturated trihydric alcohols such as glycerol, pentaerythritol or the like; Examples thereof include, but are not limited to, esters with a polyhydric alcohol or a saturated or unsaturated polyhydric alcohol such as pentavalent or more.

Here, the aliphatic carboxylic acid also includes an alicyclic carboxylic acid. Preferably an expression

[0063]

Embedded image C _n H _2n + 1 -COOH or formula HOOC-C _n H _2n
A fatty acid represented by —COOH (where n is an integer of 5 to 34);

[0064]

_{Embedded image} C _n 'H _{2n + 1} -CH ₂ OH, (R ¹ ) (R ² ) C
_{(CH 2 OH) 2, (} HOCH 2) 4 -C, (R 3) (CH 2
OH) ₂ C—R ⁴ , C (CH ₂ OH) ₂ (R ⁵ ), (HOC
H ₂ ) ₃ —C—R ⁴ —C— (CH ₂ OH) ₃ and HOCH ₂ —CH ₂ —CH (CH ₃ ) —CH ₂ —CH ₂ OH (where n is an integer of 1 to 20) , R ^1, R ² each independently represent a substituent alkyl group which may have a 1 to 10 carbon atoms, or R ¹ and R ² combine to form a 5- or 6-membered ring, R ³ and R ⁵ is each independently an alkyl group which may have a substituent having 1 to ⁴ carbon atoms, and R ⁴ is 1 to ³ carbon atoms.
4 alkylene group or — (CH ₂ ) _{n ″} —O— (CH ₂ ) _{n ″}
-(Where n ″ is an integer of 1 to 4)).

Specific examples of the carboxylic acid represented by the above formula include: stearic acid, valeric acid, caproic acid, capric acid, lauric acid, arachiic acid, behenic acid, lignoceric acid cerotic acid, mericinic acid, tetratricontanic acid,
Glutaric acid, adipic acid, azelaic acid and the like can be mentioned. Specific examples of the alcohol represented by the above formula include glycerin, 2,2-dihydroxyperfluoropropanol, neopentylene glycol, pentaerythritol, ditrimethylolpropane, and dipentaerythritol.

Examples of the ester compound of a carboxylic acid and an alcohol which can be used as a releasing agent include pentaerythritol tetrastearate, pentaerythritol tristearate, pentaerythritol monolaurate,
Glycerol tribehenate, glycerol dilaurate, glycerol monostearate, trimethylolpropane tristearate, trimethylolpropanediolate, trimethylolpropane monostearate, paraffin wax, polysiloxane, polycaprolactone, erucamide, and the like.

In order to achieve the desired object of the present invention, various conventionally known additives can be used. For example, as a light stabilizer,
2- (3-t-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, 2- (3,
5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5
-T-octylphenyl) benzotriazole, 2-
Benzotriazoles such as (3,5-di-t-pentyl-2-hydroxyphenyl) benzotriazole and 2- {2-hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) phenyl} benzotriazole Compounds, benzophenone-based compounds such as 2-hydroxy-4-octyloxybenzophenone, 2-hydroxy-4-methoxybenzophenone, and 2,4-
Benzoate compounds such as di-t-butylphenyl and 3,5-di-t-butyl-4-hydroxybenboate are exemplified.

UV absorbers such as ethyl-2-cyano-
Cyanoacrylate compounds such as 3,3-diphenylacrylate, and quencher such as nickel dibutyldithiocarbamate and nickel such as {2,2′-thiobis (4-t-octylphenolate)}-2-ethylhexylamine nickel Examples of the system quencher and metal deactivator include N, N '-{3- (3,5-
Compounds such as di-t-butyl-4-hydroxyphenyl) propionyl hydrazine; metal soaps such as calcium stearate and nickel stearate; and nucleating agents such as di (4-t-butylphenyl) phosphone Sorbitol-based compounds such as sodium acid, dibenzylidene sorbitol, and sodium salt of methylenebis (2,4-di-t-butylphenol acid phosphate), and phosphate-based compounds.

Examples of the antistatic agent include, for example, quaternary ammonium salt compounds such as (β-lauramidopropyl) trimethylammonium sulfate and alkyl phosphate compounds. Examples of the flame retardant include halogen-containing phosphates such as tris (2-chloroethyl) phosphate, halides such as hexabromocyclododecane and decabromophenyl oxide, antimony trioxide, antimony pentoxide, and aluminum hydroxide. Metal-inorganic compounds and mixtures thereof are mentioned.

[0070]

According to the present invention, 2,2-form having a specific crystal structure is provided.
By using bis (4-hydroxyphenyl) propane, an aromatic polycarbonate having a good color tone can be produced. Further, as the catalyst deactivator in the polycarbonate resin of the present invention, phosphonium sulfonate, ammonium sulfonate, sulfonate,
Above all, by blending a phosphonium sulfonate, it is possible to produce a resin having good long-term stability and suitable for producing an optical disk substrate.

[0071]

EXAMPLES In the following examples, orthorhombic 2,2
When 2-bis (4-hydroxyphenyl) propane is used, it shows that a polycarbonate having a good color tone is obtained, and in particular, when superiority of the color tone is obtained when used in combination with various additives. Furthermore, it shows that good long-term stability can be obtained when a phosphonium sulfonate, ammonium sulfonate, or sulfonate is blended. In Examples, orthorhombic 2,2-bis (4-hydroxyphenyl) propane was used, and in Comparative Examples, monoclinic 2,2-bis (4-hydroxyphenyl) propane was used.

Examples 1 to 8 and Comparative Examples 1 to 8
Bis (4-hydroxyphenyl) propane; (crystal system:
228 parts by weight, diphenyl carbonate; 2
20 parts by weight of the catalyst and the kind and amount of the catalyst shown in the table were charged into a reactor equipped with a stirrer, a distillation column and a decompression device, and after displacing with nitrogen, they were dissolved at 140 ° C. After stirring for 30 minutes,
The internal temperature was raised to 180 ° C., the reaction was performed at an internal pressure of 100 mmHg for 30 minutes, and the phenol produced was distilled off.

Then, the internal temperature was raised to 200 ° C. and the pressure was gradually reduced, and the reaction was carried out at 50 mmHg for 30 minutes while distilling off phenol. Furthermore, the temperature was gradually raised and reduced to 220 ° C. and 30 mmHg, and the reaction was carried out at the same temperature and pressure for 30 minutes, and further 240 ° C., 10 mmHg, 260 ° C. and 1 mm
Hg, 270 ° C., 1 mmHg or less, the temperature was repeatedly increased and reduced in the same procedure as above, and the reaction was continued.

Finally, the polymerization reaction was continued at the same temperature and the same pressure, and judging from the stirring power of the polymerization reactor, when the intrinsic viscosity of the polycarbonate reached about 0.35 (or about 0.45), Was collected and the intrinsic viscosity and terminal hydroxyl group concentration were measured. The intrinsic viscosities and terminal hydroxyl group concentrations of the obtained polymers are shown in Tables 1 and 2 below. Examples 1 to 4 and Comparative Examples 1 to 4 in Table 1 are polycarbonate compositions for general molding, and Examples 5 to 8 and Comparative Examples 5 to 8 in Table 2 are polycarbonate compositions for disk molding. Further, when there is another description in the table, the resin physical property improver described in the following Tables 1 and 2 was added in an amount described in the table per 100 parts by weight of the polymer, and extruded with a biaxial ruder to form chips.

[Terminal Capping Reaction, Catalyst Deactivation] A predetermined amount of a terminal capping agent (2-methoxycarbonylphenyl-phenyl-carbonate) per 100 parts by weight of the polycarbonate was added at 270 ° C. under a reduced pressure of 50 mmHg. Thereafter, the terminal blocking reaction was continued at 270 ° C. and 1 mmHg or less for 5 minutes. Thereafter, a catalyst deactivator shown in Tables 1 and 2 below was added, and mixed and stirred at the same temperature and pressure for 10 minutes to deactivate and deactivate the catalyst. By converting the OH group of the polycarbonate to a phenoxy group or another inert group,
It is suitable for keeping the coloring of the resin at a low level when used under heating conditions in an oxidizing atmosphere such as air. Tables 1 and 2 below show the terminal hydroxyl group concentration, intrinsic viscosity, and hue (color L / a / b value) of the obtained polycarbonate.
In the case where there is a separate description in the table, the resin property improver described in the following Tables 1 and 2 was added to the resin property improver described in the table per 100 parts by weight of the polymer, and extruded with a biaxial ruder to form chips.

[Analysis: Measurement of Physical Properties of Polycarbonate Composition and Raw Materials] 1) Intrinsic viscosity [η] of polycarbonate was measured in methylene chloride at 20 ° C. using an Ubbelohde viscosity tube.

(2) Hue; (a) Chip hue: The chip hue was Z-Made by Nippon Denshoku Co., Ltd.
The chip color L / a / b value was measured with a 1001DP color difference meter. (B) Molded product hue: A 50 mm x 50 mm x 5 mm flat plate was molded with a Neomat N150 / 75 injection molding machine manufactured by Sumitomo Heavy Industries, Ltd. at a cylinder temperature of 280 ° C and a molding cycle of 3.5.
Molded in seconds, and the b value of the flat plate was measured by Z-100 manufactured by Nippon Denshoku Co., Ltd.
It was measured with a 1DP colorimeter. The larger the b value, the worse the hue.

3) Transparency: The total light transmittance of the flat plate was measured by NDH- # 80 manufactured by Nippon Denshoku Co., Ltd. The higher the total light transmittance, the better the transparency.

4) Terminal hydroxyl group concentration: 0.02 g of sample
Was dissolved in 0.4 ml of chloroform, and 1H-
The terminal hydroxyl group and the terminal phenyl group were measured using NMR (EX-270 manufactured by JEOL Ltd.), and the terminal hydroxyl group concentration was measured.

5) Melt viscosity stability: Using a rheometrics RAA-type flow analyzer under a nitrogen stream at a shear rate of 1
rad / sec. It was measured at 300 ° C. About 5 minutes after the start of the measurement, after the melt viscosity was stabilized, the absolute value of the change in the melt viscosity was measured for 30 minutes, and the rate of change per minute was obtained. For good long-term stability of the polycarbonate resin composition, this value should not exceed 1%. Preferably it is 0.5% or less. When this value is large, the viscosity of the resin fluctuates directly during melt molding, so that not only a good molded product cannot be obtained, but also the long-term stability of the molded product becomes poor.

6) Long-term stability of molded article (accelerated test) Ten flat plates obtained in 2)-(b) were placed in a high-temperature, high-humidity bath for 20 days at 85 ° C. * 90% RH per day. * 1
It was exposed to an atmosphere of 2 hr and 0 ° C. * 90% RH * 12 hr. The number of fine defects glittering by shining light in the sample was visually calculated. Those with more than 10 defects were judged as NG.

[0082]

[Table 1]

[0083]

[Table 2]

Note 1) DBSP Tetrabutylphosphonium dodecylbenzenesulfonate; sodium dodecylbenzenesulfonate is reacted with a commercially available equimolar tetrabutylphosphonium bromide in water / acetone {volume (50/50)} with methylene chloride. Extracted. The methylene chloride solution was washed with water and distilled off under vacuum to obtain tetrabutylphosphonium dodecylbenzenesulfonate, which was then treated with an ion exchange resin and activated carbon in an acetone solvent. Note 2) TDBPP; tris (2,4-di-t-butylphenyl) phosphate; a commercial product was prepared by treating TPNPP in an acetone solvent with an ion exchange resin and further with activated carbon. Note 3) ODP; octadecyl-3- (3,5-di-t-)
Butyl-4-hydroxyphenyl) propionate; commercial product * Note 3 is not used in the table for the treated product (Note 4 below) in both the examples and comparative examples. Note 4) The above ODP was dissolved in acetone and activated carbon treatment was added. Note 5) PTS; pentaerythritol tetrastearate; Reaction-synthesized from pentaerythritol and stearic acid chloride in tetrahydrofuran using tetraethylamine as an acid acceptor. After the obtained tetrafuran solution was treated with activated carbon, tetrahydrofuran was distilled off under reduced pressure.

Note 6) GMS; glycerin monostearate; a commercially available product was dissolved in acetone, treated with activated carbon, and acetone was removed under reduced pressure. Note 7) PTSB: P-Toluene butyl sulfonate, a commercially available product was dissolved in acetone, activated carbon was added at 2 wt%, the treatment was carried out for 24 hours, the activated carbon was filtered, and the acetone was removed under reduced pressure. Note 8) TMAH; Tetramethylammonium hydroxide Note 9) TBPH; Tetrabutylphosphonium hydroxide Note 10) SAMDPC: Reaction of phenylchloroformate and methyl salicylate in methylene chloride with a small excess of triethylamine as an acid absorbent Was. The obtained methylene chloride solution was washed with water and further neutralized with a dilute aqueous hydrochloric acid solution.
The washing was repeated 5 to 5 times. After the obtained methylene chloride solution was treated with an ion exchange resin and activated carbon, the solvent was distilled off in vacuo, and the obtained crystals were recrystallized from xylene.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) // C08J 5/18 CFD C08J 5/18 CFD (72) Inventor Katsushi Sasaki 2nd Hinodemachi, Iwakuni-shi, Yamaguchi No. 1 Teijin Limited Iwakuni Research Center F-term (reference) 4F071 AA50 AC14 AC15 AE22 AH12 BC03 4J002 CG011 CG021 CG031 EV246 EV256 EW176 GS02 4J029 AB04 AE05 BA02 BA03 BA05 BA10 BB04A BB04BBBA13 BB05 BB05 BB04 BB05 BB04 BB05 BB05 BB05 BB04 BG24X BH02 CA04 CA06 CB05A CB06A CC06A CD03 DB07 DB11 DB13 EA05 EB05A EC06A HA01 HB01 HC02 HC03 HC04A HC05A JA091 JA121 JA161 JA201 JA261 JA301 JB171 JB201 JC031 JC091 JC631 JC731 JF011F08 K08

Claims (6)

[Claims] 1. A melt polycondensation of a dihydroxy compound having 2,2-bis (4-hydroxyphenyl) propane as a main component and an aromatic carbonate having diphenyl carbonate as a main component in the presence of a basic transesterification catalyst. In producing the sensitized aromatic polycarbonate, the 2,2-bis (4-hydroxyphenyl) propane is
A method for producing an aromatic polycarbonate, characterized by having an orthorhombic crystal structure. 2. The basic transesterification catalyst is a catalyst containing (A) a basic nitrogen compound or a basic phosphorus compound and (A) an alkali metal compound, and (A) a basic nitrogen compound or a basic phosphorus compound. As basic nitrogen or phosphorus, 10 to 500 micromol per mol of 2,2-bis (4-hydroxyphenyl) propane,
2. The aromatic compound according to claim 1, wherein (a) the alkali metal compound is used as an alkali metal element in an amount of 0.01 to 5 microequivalents per mole of 2,2-bis (4-hydroxyphenyl) propane. Production method of polycarbonate. 3. The method according to claim 1, wherein a catalyst deactivator is added after the melt polycondensation, and the melt viscosity stability is controlled to 0.5% or less. Production method of aromatic polycarbonate. 4. The catalyst deactivator is one or more compounds selected from the group consisting of phosphonium sulfonate, ammonium sulfonate, and sulfonate, and the catalyst deactivator is a transesterification catalyst. The method for producing an aromatic polycarbonate according to claim 3, wherein 0.5 to 30 chemical equivalents are used per 1 chemical equivalent of the alkali metal element of the alkali metal compound used as the compound. 5. A basic ester comprising a dihydroxy compound mainly composed of 2,2-bis (4-hydroxyphenyl) propane having an orthorhombic crystal structure and an aromatic carbonate mainly composed of diphenyl carbonate. Aromatic polycarbonate resin for molding a disk substrate characterized in that the melt viscosity stability obtained by blending a catalyst deactivator with the aromatic polycarbonate obtained by melt polycondensation in the presence of an exchange catalyst is 0.5% or less. . 6. An optical disk substrate formed from the aromatic polycarbonate resin according to claim 5.