JPH1025408A - Aromatic polycarbonate composition and preparation thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an arom. polycarbonate compsn. which possesses a excellent heat stability even upon aging by adding a phosphorous ester compd. having a specified structure to a specified arom. polycarbonate. SOLUTION: This arom. polycarbonate compsn. is prepd. by incorporating tris(2,4-di-t-butylphenyl) phosphite (B) in an amt. of 10 to 1,000ppm into an arom. polycarbonate (A), having a terminal hydroxyl content of not more than 1,000ppm, prepd. by melt-polymerizing a carbonic diester and an arom. dihydroxy compd. in the presence of a transesterification catalyst in an amt. of 0.01 to 10μmol/mol (the amt. of the metal in the catalyst based on the arom. dihydroxy compd.). This compsn. is an arom. polycarbonate compsn. comprising 10 to 1,000ppm of a compd. represented by the formula contained in the component (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a hue, a thermal stability,
The present invention relates to an aromatic polycarbonate composition having excellent hydrolysis resistance and obtained by a transesterification method, and a method for producing the same.

[0002]

2. Description of the Related Art The so-called transesterification method for producing an aromatic polycarbonate by reacting a carbonic acid diester with an aromatic dihydroxy compound has a relatively simple process.
Not only can it be superior to the phosgene method (interfacial polymerization method) in terms of operation and cost, but also because it does not use highly toxic phosgene or a halogen-based solvent such as methylene chloride, it has recently attracted attention from the environmental conservation point of view. ing. However, at present, the transesterification method is still rarely used as a large-scale industrial process. The reason for this is that polycarbonates produced by the conventional transesterification method have some disadvantages in physical properties, and in particular, deterioration of hue due to heating is a major problem. Various studies have been made to solve this problem, but it has been difficult to obtain a polycarbonate having sufficient heat stability.

[0003] It has been pointed out that the amount of terminal hydroxyl groups is larger in the production by the transesterification method than in the production by the interfacial polymerization method (Polymer Analysis Handbook, page 345 (Asakura Shoten, 1985)). It is known that if a polycarbonate is produced by a transesterification method without any contrivance, a product having a very large terminal hydroxyl group concentration in all terminal groups of 30 to 50 mol% can be easily produced (Japanese Patent Laid-Open No. Hei 2-2-2). No. 261860) Aromatic polycarbonates having a large amount of terminal hydroxyl groups have poor physical properties such as thermal stability, and therefore, if it is intended to prevent a decrease in physical properties due to terminal hydroxyl groups without an appropriate stabilizer, it is necessary to use a terminal terminator. However, thermal stability was still insufficient by itself (Japanese Patent Laid-Open No. 2-175723).

On the other hand, it is known that the same stabilizer as described below is added to a polycarbonate obtained by an interfacial polymerization method. However, in the case of the transesterification method, a specific process is required, a large amount of a stabilizer is added, and other additives are indispensable (JP-A-4-103626, JP-A-5-9286). Gazette). Also, none of them consider the relationship between the terminal hydroxyl group content and the hue of polycarbonate. As described above, in the conventionally known method for producing an aromatic polycarbonate resin, an appropriate amount of a stabilizer is not used in consideration of the influence of the terminal hydroxyl group amount of the polycarbonate and the amount of the catalyst used. It could not be said that the stability improvement was sufficiently made.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to an aromatic polycarbonate composition obtained by a transesterification method, which maintains high transparency and good hue even at a high temperature, has excellent heat stability, and a process for producing the same. Is provided.

[0006]

That is, the present invention provides:
(A) The amount of terminal hydroxyl groups obtained by melt-polymerizing a carbonic acid diester and an aromatic dihydroxy compound is 1,000 ppm.
An aromatic polycarbonate composition comprising the following aromatic polycarbonate containing (B) 10 to 1,000 ppm of tris (2,4-di-t-butylphenyl) phosphite of the following general formula (1). It provides things.

[0007]

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[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. Aromatic polycarbonate used in the present invention,
It is obtained by melt-polymerizing a carbonic acid diester and an aromatic dihydroxy compound using a transesterification catalyst. The carbonic acid diester used in the present invention is a compound represented by the following general formula (2).

[0009]

Embedded image

(Wherein R is a monovalent aliphatic or monovalent aromatic group, and R may be the same or different.) The carbonic acid diester represented by the above general formula (2) is For example, diphenyl carbonate, dimethyl carbonate,
Examples thereof include ditolyl carbonate and di-t-butyl carbonate. Particularly preferred are diphenyl carbonate and substituted diphenyl carbonate. These carbonic diesters may be used alone or in combination of two or more. Also, together with the carbonic acid diester as described above,
The dicarboxylic acid or dicarboxylic acid ester may be used in an amount of preferably 50 mol% or less, more preferably 30 mol% or less. As such a dicarboxylic acid or dicarboxylic acid ester, terephthalic acid, isophthalic acid, diphenyl terephthalate, diphenyl isophthalate and the like are used. When such a carboxylic acid or carboxylic acid ester is used in combination with a carbonic acid diester, a polyester carbonate is obtained.

The aromatic dihydroxy compound used in the present invention is a compound represented by the following general formula (3).

[0012]

Embedded image

Wherein A is 2 having 1 to 15 carbon atoms
Valent hydrocarbon group, a divalent halogenated hydrocarbon group or _{-S -, - SO 2 -,} - SO -, - O-, and -CO
Represents a divalent group such as-, X is a halogen atom, an alkyl group having 1 to 14 carbon atoms, an aryl group having 6 to 18 carbon atoms,
It represents an oxyalkyl group having 1 to 8 carbon atoms and an oxyaryl group having 6 to 18 carbon atoms. m is 0 or 1, and y is an integer of 0-4. )

The aromatic dihydroxy compound represented by the general formula (3) is, for example, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-
3,5-dimethylphenyl) propane, 2.2-bis (4
-Hydroxy-3,5-diethylphenyl) propane,
2,2-bis [4-hydroxy- (3,5-diphenyl)
Phenyl] propane, 2,2-bis (4-hydroxy-
3,5-dibromophenyl) propane, 2,2-bis (4
-Hydroxyphenyl) pentane, 2,4'-dihydroxy-diphenylmethane, bis (4-hydroxyphenyl) methane, bis (4-hydroxy-5-nitrophenyl) methane, 1,1-bis (4-hydroxyphenyl)
Ethane, 3,3-bis (4-hydroxyphenyl) pentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl) sulfone,
2,4'-dihydroxydiphenyl sulfone, bis (4-
Hydroxyphenyl) diphenyl sulfone, bis (4-
(Hydroxyphenyl) sulfide, 4,4′-dihydroxydiphenyl ether, 4,4′-dihydroxy-3,3 ′
-Dichlorodiphenyl ether, bis (4-hydroxy-2,5-diethoxyphenyl) oxide and the like. These aromatic dihydroxy compounds can be used alone or
A mixture of two or more species can be used, and a copolymer can be used if necessary.

The higher the purity of the carbonic acid diester and aromatic dihydroxy compound used in the main polymerization, the better. The sodium content is 0.1 ppm or less, and the Fe content is 0.5 p.
pm or less, the amount of hydrolyzable Cl is 0.3 ppm or less, and among the other impurity components, 0.5 ppm or less is suitably used as a raw material.

Although the aromatic polycarbonate of the present invention is produced by a transesterification reaction, the final amount of terminal hydroxyl groups varies depending on the molar ratio of raw materials at the time of charging, the amount of catalyst, the heating temperature, the heating time, the pressure reduction process and the like. Even if they are the same, they also differ depending on the reflux efficiency of the generated aromatic hydroxy compound and the raw material, and the thermal constant and scale of the production apparatus. However, if the production equipment and other conditions do not change, it is possible to obtain a polymer having an almost arbitrary amount of terminal hydroxyl groups in the charged raw material ratio.

The effect of improving the thermal stability of the aromatic polycarbonate significantly differs depending on the amount of terminal hydroxyl groups and the amount of tris (2,4-di-t-butylphenyl) phosphite added. The amount of terminal hydroxyl groups of the aromatic polycarbonate exhibiting the effect is usually essential to be 0.1 ppm to 1,000 ppm or less, preferably 700 ppm or less, more preferably 500 ppm or less. In the case of more than 1,000 ppm, tris (2,
Even if 4-di-t-butylphenyl) phosphite is added, desired heat resistance cannot be obtained.

The polymerization is generally carried out in two or more stages. Specifically, the first-stage reaction is carried out under normal pressure or reduced pressure at 120 to 260 ° C, preferably 180 to 240 ° C.
At a temperature of 0.1 to 5 hours, preferably 0.5 to 3 hours. Then, the reaction temperature was increased while increasing the degree of pressure reduction of the reaction system, and finally 240 to 3
The polycondensation reaction is performed at a temperature of 20 ° C.

The type of the reaction may be any of a batch type, a continuous type, or a combination of a batch type and a continuous type. The apparatus used may be any of a tank type, a tube type and a column type. Good.

In the present invention, the molecular weight is not particularly limited, but the viscosity average molecular weight (Mv) is 10,000 to 50,000.
It is preferably in the range of 00.

In the production of the aromatic polycarbonate of the present invention, a metal catalyst is used as a transesterification catalyst.
The metal catalyst as used herein refers to a catalyst comprising a transition metal element containing an alkali metal, an alkaline earth metal, and a rare earth. Among these, alkali metal catalysts and rare earth metal catalysts are particularly preferred. The amount of the metal in the catalyst used is 0.01 to 10 μmol / mol, preferably 0.1 to 5 μmol / mol, more preferably 0.2 to 3 μmol, based on the aromatic dihydroxy compound. Mol / mol. If the amount of the metal in the catalyst is less than 0.01 μmol / mol, it is difficult to obtain a polycarbonate having a desired molecular weight, and if it exceeds 10 μmol / mol, the physical properties deteriorate.

As an example of the catalyst which can be used in the present invention, examples of the alkali metal compound include sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, sodium carbonate, potassium carbonate, and the like. Lithium carbonate, sodium acetate, potassium acetate, lithium acetate, sodium stearate, potassium stearate, lithium stearate, sodium borohydride, lithium borohydride, sodium borohydride, sodium benzoate, potassium benzoate,
Lithium benzoate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, dilithium hydrogen phosphate, disodium phenylphosphate, dipotassium phenylphosphate, dilithium phenylphosphate, sodium lithium iminocarboxylate, bisphenol A 2 Sodium salt, bisphenol A 2
Potassium salt, 2 lithium salt of bisphenol A, sodium salt of phenol, potassium salt of phenol, lithium salt of phenol, tetramethyl boron, tetraethyl boron, tetrapropyl boron, tetrabutyl boron,
Trimethylethylboron, trimethylbenzylboron,
Trimethylphenylboron, triethylmethylboron,
Sodium salts such as triethylbenzylboron, triethylphenylboron, tributylmethylboron, tributylbenzylboron, tributylphenylboron, tetraphenylboron, benzyltriphenylboron, methyltriphenylboron, butyltriphenylboron,
Potassium salt, lithium salt, cesium salt, or strontium salt and the like, preferably carbonate, phosphate, borate, quaternary ammonium salt, more preferably,
It is suitable to use sodium carbonate, potassium carbonate, cesium carbonate, disodium phenylphosphate, dipotassium phenylphosphate, dicesium phenylphosphate, sodium tetraphenylborate, potassium tetraphenylborate, cesium tetraphenylborate alone or in combination. It is.

Further, as the alkaline earth metal compound,
Calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide, calcium bicarbonate, barium bicarbonate, magnesium bicarbonate, strontium bicarbonate, calcium carbonate, magnesium carbonate, barium carbonate, strontium carbonate, calcium acetate, barium acetate, Examples thereof include magnesium acetate, strontium acetate, calcium stearate, magnesium stearate, barium stearate, and strontium stearate.

Examples of the rare earth metal catalyst include oxides, hydroxides, carbonates, acetates, salts of aromatic or aliphatic alcohols such as lanthanum, cerium, neodymium, samarium, gadolinium, dysprosium, erbium, ytterbium, and phosphoric acid. Or acid phosphate salts and halides, but preferred metals are lanthanum, cerium, lanthanum oxide, lanthanum carbonate,
Lanthanum acetate, lanthanum phenoxide, lanthanum methoxide, cerium carbonate, cerium oxide, cerium phenoxide and the like can be exemplified. Other transition metal catalysts include:
Examples include titanium oxide, nickel oxide, manganese dioxide, cobalt acetate, nickel acetate, zirconium oxide, and hafnium oxide.

In the present invention, among the boron-based compounds, amine-based compounds, ammonium compounds and phosphorus-based compounds, compounds not containing the above-mentioned metals can also be used in combination with the above-mentioned metal catalysts. These may be used alone or in combination of two or more, but the amount of these catalysts is, of course, not included in the amount of metal catalyst of the present invention. The amount of these catalysts used is usually such that the amount of metal in the catalyst is 0.001 relative to the aromatic dihydroxy compound.
１1,000 μmol / mol, preferably 0.1-100 μmol
It is used in the range of mol / mol.

As these compounds, for example, 4-aminopyridine, 2-aminopyridine, N, N-dimethyl-
4-aminopyridine, 4-diethylaminopyridine, 2
-Hydroxypyridine, 2-methoxypyridine, 4-methoxypyridine, 2-dimethylaminoimidazole, 2
-Methoxyimidazole, imidazole, 2-mercaptoimidazole, 2-methylimidazole, aminoquinoline, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylethylammonium hydroxide, trimethylbenzyl Ammonium hydroxide, trimethylphenylammonium hydroxide, triethylbenzylammonium hydroxide,
Triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenylammonium hydroxide, butyltriphenylammonium hydroxide Side, tetraethylphosphonium tetrahydroxyborate, tetraphenylphosphonium tetrahydroxyborate and the like are exemplified.

The relationship between the amount of terminal hydroxyl groups, the amount of tris (2,4-di-t-butylphenyl) phosphite and the amount of catalyst used in the present invention will be described in more detail. When the addition amount of 4-di-t-butylphenyl) phosphite is B ppm and the amount of metal in the catalyst used is C μmol / mol with respect to the aromatic dihydroxy compound, the following formula is obtained.

[0028]

-500 ≦ A- (B / C) ≦ 500 and 0.1 ≦ A <1,000, 10 ≦ B <500 and
0.01 ≦ C <10

It is necessary to add the stabilizer within a range satisfying the conditions. Preferably, -400 ≦ A- (B / C) ≦ 400 and 0.1 ≦ A <1,000, 10 ≦ B <500 and
0.01 ≦ C <10, more preferably −300 ≦ A− (B / C) ≦ 300 and 0.1 ≦ A <1,000, 10 ≦ B <500 and
0.01 ≦ C <10. In any case, if there is a range in the usable amount calculated from the above formula, the tris (2,4-di-
The addition amount of (t-butylphenyl) phosphite is 10 to 1,000 ppm, preferably 50 to 500 ppm, more preferably 50 to 500 ppm, based on the polycarbonate.
What is necessary is just 300 ppm. If the amount is less than this, the desired effect cannot be obtained. If the amount is excessive, adverse effects such as a decrease in mechanical properties and heat-resistant properties are caused, which is not appropriate.

By using the formula of the present application, it is possible to adjust the optimum amount of the additive in accordance with the change in the amount of terminal hydroxyl group due to the fluctuation of the production conditions, and to avoid the deterioration of the physical properties due to the shortage of the stabilizer and the adverse effect due to the excessive addition. Can be done.

There are no particular restrictions on the timing and method of adding tris (2,4-di-t-butylphenyl) phosphite. For example, tris (2,4-di-t-butylphenyl) phosphite is diluted with polycarbonate or the like during or after the polymerization reaction. 2,4-di-t-
A method of adding a masterbatch pellet of (butylphenyl) phosphite may be used.

The aromatic polycarbonate composition obtained by the production method of the present invention may be selected from UV absorbers, antioxidants, mold release agents, and release agents commonly used in interfacial polycarbonates within a range that does not impair the physical properties of the composition. It can be used in combination with other additives such as a flame retardant, an antistatic agent, a pigment and a dye.
The timing of addition is not particularly limited, but is preferably during the molten state after the completion of polymerization, or during molding after pelletization.

Examples of the antioxidant include hindered phenol-based, phosphorus-based, and sulfur-based antioxidants.
n-octadecyl- [3- (4-hydroxy-3,5-di-t-
Butylphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], pentaerythrityl-tetrakis [3- (3,5-di -T-butyl-4-hydroxyphenyl) propionate], triethylene glycol bis [3- (3-t-butyl-4-hydroxy-5)
-Methylphenyl) propionate], 3,9-bis {2- [3- (3-t-butyl-4-hydroxy-5-
Methylphenyl) propionyloxy] -1,1-dimethylethyl {-2,4,8,10-tetraoxaspiro (5.5) undecane, tris (2,4-di-t-butylphenyl) phosphite, , 2-methylenebis (4.6
-Di-t-butylphenyl) octyl phosphite, tetrakis (2,4-di-t-butylphenyl) -4,4 ′
-Biphenylenediphosphonite, tetrakis (2,4-
Di-tert-butyl-5-methylphenyl) -4,4'-biphenylenediphosphonite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol-di-
Phosphite, thiodiethylene bis- (3,5-di-t
-Butyl-4-hydroxy) hydrocinnamate and the like. The addition amount is 10 ppm to 1,000 pp
It is preferable to use in the range of m.

In the present invention, a phosphorus-based stabilizer can be used in addition to the above-mentioned stabilizers. Such phosphorus-based compounds include, for example, triethylphosphine, tri-n
-Propylphosphine, triisopropylphosphine,
Examples thereof include tri-n-butylphosphine, triphenylphosphine, tributylphosphite, and triphenylphosphite.

As the catalyst deactivator, an aromatic sulfonic acid compound is effective, and particularly, p-toluenesulfonic acid and p-toluenesulfonic acid ester are suitable, and preferably, p-toluenesulfonic acid and p-toluenesulfonic acid are used. It is desirable to use butyl toluenesulfonate. Examples of the p-toluenesulfonic acid ester include methyl p-toluenesulfonate, ethyl p-toluenesulfonate, propyl p-toluenesulfonate, butyl p-toluenesulfonate,
Examples include pentyl toluenesulfonate, hexyl p-toluenesulfonate, octyl p-toluenesulfonate, phenyl p-toluenesulfonate, phenethyl p-toluenesulfonate, and naphthyl p-toluenesulfonate. The addition amount is suitably 1 to 10 times the molar amount of the metal of the catalyst. If the amount is out of this range, a sufficient deactivating effect cannot be obtained, or excess p-toluenesulfonic acid or p-toluenesulfonic acid -Toluenesulfonic acid ester decomposes tris (2,4-di-t-butylphenyl) phosphite, and a sufficient effect cannot be obtained.

In the aromatic polycarbonate of the present invention, the amount of carbonic acid diester remaining in the resin is suitably 500 ppm or less, preferably 300 ppm or less, more preferably 100 ppm or less.
The following is desirable. If the amount of the remaining carbonic diester is large, sufficient heat resistance of the polycarbonate cannot be obtained.
In order to reduce the amount of the remaining carbonic acid diester, for example, washing or extraction with a solvent, decomposition or reaction by the addition of other compounds, and the like, preferably, when adding various additives using an extruder and pelletizing. In addition, the pressure is reduced by reducing the pressure. Further, it is preferable to perform devolatilization by pouring water. In this case, it is preferable to devolatilize by pouring water before adding tris (2,4-di-t-butylphenyl) phosphite.

[0037]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to the following examples. In addition, evaluation of the obtained polycarbonate was performed by the following method. (1) Molecular Weight The intrinsic viscosity [η] in methylene chloride at 20 ° C. was measured using an Ubbelohde viscometer, and the viscosity average molecular weight (Mv) was determined from the following equation. [Η] = 1.11 × 10 ⁻⁴ × (Mv) ^0.83

(2) Terminal OH content Titanium tetrachloride / acetic acid method (Makromol Chem. 88 215 (1965))
Was used for colorimetric determination.

(3) Hue The obtained polycarbonate is 50 mm in diameter and 3 mm in diameter.
Produces thick disk-shaped injection molded products and uses Tokyo Denshoku's Automatic Color Analyzer Model TC-1800
The YI value was measured by MKII. (The smaller the value, the better the hue)

(4) Residual monomer 5 g of the obtained polycarbonate was added to 15 ml of methylene chloride.
And reprecipitated with acetone. After filtration, the filtrate was evaporated to dryness and the residue was dissolved in chloroform to obtain a sample. Gas chromatography (GC-14PF 1 made by Shimadzu)
00V), the DPC was quantified (column: Silicone OV)
-17 Gaschrom Industry Co., Ltd.). In addition, GPC (SPD made by Shimadzu)
-6A) to determine residual BPA and phenol (column: Shodex, k-806M × 2.k803.K-802 × 2).

(5) Amount of sodium The amount of sodium was determined by an atomic absorption method (Varian Co., Ltd., Spectro-AA) using 20 g of the polymer.

Example 1 Diphenyl carbonate (hereinafter referred to as DPC) and 2,2-bis (4-hydroxyphenyl) propane (bisphenol A: hereinafter referred to as BPA) were dissolved in a dissolving tank under a nitrogen atmosphere for 150 hours.
The mixture was dissolved and mixed at a molar ratio (DPC / BPA) of 1.15 ° C. Sodium hydroxide was added at a rate of 1.0 μmol / mol (relative to BPA) at a temperature of 210 ° C.-100 mmHg in a first tank, and a second tank at 240 ° C.-15 mmHg and a third tank at 280 ° C.
Under a condition of -0.5 mmHg, the polymerization reaction was continuously performed for 1 hour in each tank to obtain a polycarbonate. The molten polycarbonate is sent to the twin-screw extruder from the third tank,
In a twin screw extruder, butyl p-toluenesulfonate (hereinafter p
-TSB) at a rate of 5 ppm, and injects and devolatilizes a monomer and a low-molecular-weight substance at each part of the 3 vents to obtain tris (2,4-
Di-t-butylphenyl) phosphite (Adeka Argus Co., Ltd .: Adegas Tab 2112) (hereinafter AS211)
2) was added and kneaded at a ratio of 200 ppm, and then pelletized with a pelletizer. The obtained polycarbonate had Mv = 14,600, terminal OH = 220 ppm, and residual DPC = 200 ppm. Next, a disk having a diameter of 50 mmφ and a thickness of 3 mm was manufactured by an injection molding machine. The YI value of the obtained disk was 1.18. The YI value of this disk after performing an aging test in a hot air dryer at 140 ° C. for 240 hours was 1.36. Examples 2 to 5 and Comparative Examples 1 to 4 Polycarbonates were produced and evaluated in the same manner as in Example 1 except that the molar ratio of BPA and DPC, the type and amount of catalyst, and the amount of additives were changed as shown in Table 1. .

[0043]

[Table 1]

[0044]

According to the method of the present invention, a phosphite compound having a specific structure is added so as to satisfy specific conditions, so that a polycarbonate having excellent heat resistance even after aging treatment is obtained. Is an industrially extremely effective method.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Kimura 1000 Kamoshita-cho, Aoba-ku, Yokohama-shi, Kanagawa Prefecture Mitsubishi Chemical Corporation Yokohama Research Laboratory (72) Inventor Michio Kawai 1-Tohocho, Yokkaichi-shi, Mie Mitsubishi Chemical Corporation The inside of Yokkaichi Research Institute

Claims (6)

[Claims] 1. An aromatic polycarbonate having a terminal hydroxyl group content of 1,000 ppm or less obtained by melt-polymerizing (A) a carbonic acid diester and an aromatic dihydroxy compound,
(B) An aromatic polycarbonate composition containing 10 to 1,000 ppm of tris (2,4-di-t-butylphenyl) phosphite of the following general formula (1). Embedded image 2. The aromatic polycarbonate composition according to claim 1, wherein the amount of sodium in the aromatic polycarbonate is 0.09 ppm or less. 3. The aromatic polycarbonate according to claim 1, further comprising p-toluenesulfonic acid or p-toluenesulfonic acid ester as a catalyst deactivator in an amount of 1 to 10 times the amount of the catalyst metal. Composition. 4. The aromatic polycarbonate composition according to claim 1, wherein the amount of the residual carbonic acid diester in the aromatic polycarbonate is 500 ppm or less. 5. A polymer obtained by melt-polymerizing a diester carbonate and an aromatic dihydroxy compound in the presence of 0.01 to 10 μmol / mol of transesterification catalyst (the amount of metal in the catalyst with respect to the aromatic dihydroxy compound). The aromatic polycarbonate (A) having a terminal hydroxyl group content of 1,000 ppm or less is blended with (B) tris (2,4-di-t-butylphenyl) phosphite in an amount of 10 to 1,000 ppm. Item 10. A method for producing the aromatic polycarbonate composition according to Item 1. 6. The amount of terminal hydroxyl groups of the aromatic polycarbonate is A ppm, the amount of tris (2,4-di-t-butylphenyl) phosphite added is B ppm, and the amount of metal in the transesterification catalyst used is C μmol / mol. In terms of moles (relative to the aromatic dihydroxy compound), the following formula: -500 ≦ A- (B / C) ≦ 500 and 0.1 ≦ A <1,000, 10 ≦ B <500 and
The aromatic polycarbonate composition according to claim 5, wherein tris (2,4-di-t-butylphenyl) phosphite as the component (B) is blended within a range satisfying 0.01 ≦ C <10. Manufacturing method of goods.