JP2002348367A - Aromatic polycarbonate resin and molded article therefrom - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A specific structure which has improved heat stability, oblique incidence birefringence, fluidity, warpage, etc. during molding while maintaining excellent transparency, heat resistance and mechanical properties of a polycarbonate resin. And a molded article thereof. SOLUTION: At least 2 mol% of the wholly aromatic dihydroxy component is α, α'-bis (4-hydroxyphenyl).
In the aromatic polycarbonate resin which is -m-diisopropylbenzene, (A) the content of the specific compound contained in the polycarbonate resin measured by the method defined in the text is 0.05% or less; ) 0.7 g of the polycarbonate resin was mixed with 100 parts of methylene chloride.
Resins satisfying that the specific viscosity measured at 20 ° C. of a solution dissolved in ml is in the range of 0.2 to 2.0, and a molded article thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an aromatic polycarbonate resin and a molded article formed therefrom.
More specifically, the present invention relates to an aromatic polycarbonate resin excellent in thermal stability, optical anisotropy, fluidity, rigidity and the like at the time of molding, and a molded article formed therefrom.

[0002]

2. Description of the Related Art Conventionally, polycarbonate resins obtained by reacting 2,2-bis (4-hydroxyphenyl) propane (commonly known as bisphenol A) with phosgene or diphenyl carbonate have good transparency, heat resistance and dimensional accuracy. In recent years, it has been widely used as a material of an information recording medium substrate in the field of an optical information recording medium because of its excellent property. However, the polycarbonate resin from bisphenol A has a disadvantage that the photoelastic constant is large due to the optical anisotropy of the benzene ring, and therefore the molded article has a large birefringence. In addition, since the warpage becomes a problem in order to further reduce the thickness of the substrate, a polycarbonate resin having higher rigidity and less warpage is required.

In order to increase the recording density, a resin having better transferability is required. On the other hand, a durable resin is also required. Furthermore, the development and commercialization of compact discs for video have recently been promoted. Therefore, the recording capacity of a conventional compact disc for audio (about 650 MB per disc of 12 cm in diameter)
Is required to be about 10 times (recording density of about 6.5 GB per disc having a diameter of 12 cm) or higher than that of the recording medium, and further higher characteristics are also required.

Japanese Patent Publication No. 39-96 discloses α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene (hereinafter sometimes abbreviated as bisphenol M) represented by the above formula (1). Are described. Also, JP-A-63-89525, JP-A-63-89532, JP-A-8-81
JP-A-549 and JP-A-8-293128 disclose an optical disk composed of a polycarbonate resin copolymerized with bisphenol M and a specific diphenol, which has a smaller birefringence than an optical disk composed of a polycarbonate resin derived from bisphenol A. Is specifically shown.

[0005] Among them, Japanese Patent Application Laid-Open No. 8-293128 discloses α, α'-bis (4-hydroxyphenyl) -m
It is shown that a polycarbonate resin formed from a dihydroxy component consisting of -diisopropylbenzene and 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane is excellent as an optical disk substrate. This resin provides an optical disc substrate having excellent properties such as transparency, heat resistance, mechanical properties, oblique incidence birefringence, water absorption, transferability, and warpage. However,
Furthermore, in recent years, improvement in molding cycles and demand for high-density discs have made thermal stability particularly important during high-temperature molding, and resins having more excellent thermal stability have been demanded.

[0006]

SUMMARY OF THE INVENTION A first object of the present invention is to maintain excellent transparency, heat resistance and mechanical properties of a polycarbonate resin while maintaining heat stability during molding.
It is an object of the present invention to provide an aromatic polycarbonate resin having a specific structure with improved oblique incidence birefringence, fluidity, warpage, and the like, and a molded article made thereof.

A second object of the present invention is to use a lens, a prism, an optical card, an optical fiber, an optical component such as an optical disk substrate, a sheet, a glazing application, a blow molding application, and the like.
An object of the present invention is to provide an aromatic polycarbonate resin suitable for ink binders, foam molding applications, filaments, wires, electric insulating materials, OPC binders, headlamp lenses, reflectors, stretched or unstretched films, and the like.

A third object of the present invention is to provide an optical disk substrate which has a high function suitable for an optical disk substrate having a particularly high-density recording capacity, particularly a video optical disk substrate, and which can be easily melt-molded. It is in.

The present inventor has conducted intensive studies to achieve these objects, and as a result, selected an aromatic polycarbonate resin having a specific structure, and in a specific viscosity range, further reduced the ratio of specific components to a specific amount or less. As a result, the present invention has been found to provide a molded article with reduced coloring during molding, in particular, a molded article having good transferability and less warpage on an optical disk substrate, and has achieved the present invention.

[0010]

According to the study of the present inventors, an object of the present invention is to provide an aromatic dihydroxy component in which at least 2 mol% of the aromatic dihydroxy component is a compound represented by the following general formula (1). In the group III polycarbonate resin, (A) the following general formulas [X-1] to [X-] measured by a method defined in the text contained in the polycarbonate resin.
4] is 0.05% or less, and (B) the specific viscosity measured at 20 ° C. of a solution of 0.7 g of the polycarbonate resin in 100 ml of methylene chloride is 0.2%. This is achieved by an aromatic polycarbonate resin characterized by being in the range of 2 to 2.0.

[0011]

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[0012]

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[0013]

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[0014]

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[0015]

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Hereinafter, the aromatic polycarbonate resin of the present invention will be described. The aromatic polycarbonate resin targeted by the present invention is α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene (hereinafter, referred to as “bisphenol M”) represented by the above formula (1). Has at least two of the wholly aromatic dihydroxy components.
It needs to be mol%.

The aromatic polycarbonate resin of the present invention comprises:
Said bisphenol M comprises at least 2 mol%, preferably at least 3 mol%, more preferably at least 5 mol%, even more preferably at least 10 mol%, particularly preferably at least 20 mol%, most preferably at least 20 mol% of the total aromatic dihydroxy component. 30 mol% is used. When the proportion of this bisphenol M is less than 2 mol%, the performance of the obtained molded product is insufficient. In particular, as an optical disk substrate or optical disk, transparency, heat resistance, mechanical properties, oblique incidence birefringence, fluidity In addition, any of the properties of transferability and warpage becomes unsatisfactory, and an optical disc substrate or an optical disc satisfying all of these properties cannot be obtained. Bisphenol M may be 100 mol%, but since the glass transition temperature (Tg) is low, when the proportion of bisphenol M is high, it is desirable to copolymerize with bisphenols that increase the Tg of a specific structure.

The aromatic polycarbonate resin of the present invention comprises:
The proportion of bisphenol M in the wholly aromatic dihydroxy component constituting it is preferably in the range of 3 to 99 mol%, and preferably 5 to 99 mol%.
More preferably in the range of from 95 to 95 mol%, and more preferably from 10 to 90 mol%.
Is more preferably in the range of 20 to 80 mol%, and most preferably in the range of 30 to 70 mol%.

According to the study of the present inventor, the copolymerized polycarbonate resin obtained by combining the bisphenol M with a specific dihydroxy component is suitable for use as a molded article of the present invention, particularly as an optical disk substrate. Was found. That is, the copolymerized polycarbonate resin comprises (a) bisphenol M (hereinafter referred to as component a) and (b) 1,1-bis (4-hydroxyphenyl)-
3,3,5-trimethylcyclohexane (hereinafter sometimes abbreviated as “bisphenol TMC”), 9,9-bis (4-hydroxy-3-methylphenyl) fluorene (hereinafter abbreviated as “biscresolfluorene”) Yes) and 2,2-bis (4-hydroxyphenyl)
At least one compound selected from the group consisting of propane (hereinafter may be abbreviated as "bisphenol A") [these components are referred to as component b] is at least 80 mol% of the total aromatic dihydroxy component; A polycarbonate resin having a molar ratio with the component b of 2:98 to 95: 5 is particularly preferable as the molded article and the optical disk substrate of the present invention.

One of the preferred embodiments of the copolymerized polycarbonate resin is a combination wherein component a is bisphenol M and component b is bisphenol TMC,
In that case, the ratio of component a: component b is 3:97 in molar ratio.
~ 95: 5 is preferable, 5: 95 ~ 90: 10 is more preferable, 10: 90 ~ 80: 20 is more preferable, 20: 80 ~ 75: 25 is particularly preferable, and 30: 80 ~ 75: 25 is more preferable. The range of 70 to 70:30 is most preferred.

Another preferred embodiment is that component a is bisphenol M and component b is a combination of biscresol fluorene, in which case the ratio of component a to component b is 3:97 to 95 in molar ratio. : Preferably in the range of 5;
The range of 0:90 to 92: 8 is more preferable, and 20:80.
The range of -90: 10 is more preferable, especially 30:70.
The range of -80: 20 is preferred.

Still another preferred embodiment is that component a is bisphenol M and component b is bisphenol A
Wherein the molar ratio of component a: component b is preferably in the range of 3:97 to 95: 5, and preferably 5:95.
The range of -90: 10 is more preferable, and 10: 90-8.
The range of 0:20 is more preferable, especially 20:80 to 7
A range of 0:30 is preferred.

In these preferred embodiments, the sum of component a and component b is advantageously at least 80 mol%, preferably at least 90 mol%, of the total aromatic dihydroxy component, and typically component a And a copolymerized polycarbonate resin substantially formed by component b.

In the preferred embodiment, when the proportion of bisphenol M is less than 3 mol%, the water absorption of the resin increases and the fluidity tends to decrease.

In the aromatic polycarbonate resin of the present invention, it is desirable that the component a and the component b account for at least 80 mol%, preferably at least 90 mol% of the total aromatic dihydroxy component, but the other dihydroxy component (component c) 20 mol% based on the total aromatic dihydroxy component
Below, preferably 10 mol% or less may be contained.

The component c is usually used as a dihydroxy component of an aromatic polycarbonate.
Any component other than component a and component b may be used, such as hydroquinone, resorcinol, 4,4′-biphenol, 1,1-bis (4-hydroxyphenyl) ethane,
2,2-bis (3-methyl-4-hydroxyphenyl)
Propane, 2,2-bis (4-hydroxyphenyl) butane, 1,1-bis (4-hydroxyphenyl) -1-
Phenylethane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxyphenyl) pentane, 4,4 ′-(p-phenylenediisopropylidene) diphenol, 9,9-bis (4-hydroxyphenyl) fluorene, 1,1-bis (4-hydroxyphenyl) -4-isopropylcyclohexane, and the like.

The aromatic polycarbonate resin of the present invention comprises:
It is produced by a reaction means known per se for producing ordinary aromatic polycarbonate resins, for example, a method of reacting an aromatic dihydroxy component with a carbonate precursor such as phosgene or carbonic acid diester. Next, basic means of these manufacturing methods will be briefly described.

In the reaction using, for example, phosgene as the carbonate precursor, the reaction is usually carried out in the presence of an acid binder and a solvent. Examples of the acid binder include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide and amine compounds such as pyridine. As the solvent, for example, halogenated hydrocarbons such as methylene chloride and chlorobenzene are used. For promoting the reaction, a catalyst such as a tertiary amine or a quaternary ammonium salt may be used. At that time, the reaction temperature is usually 0 to 40 ° C, and the reaction time is several minutes to 5 hours.

The transesterification reaction using a carbonic acid diester as a carbonate precursor is a method in which a predetermined ratio of an aromatic dihydroxy component is stirred with a carbonic acid diester while heating under an inert gas atmosphere to distill off the produced alcohol or phenol. It is performed by The reaction temperature varies depending on the boiling point of the produced alcohol or phenol, and is usually in the range of 120 to 350 ° C. The reaction is completed under reduced pressure from the beginning while distilling off alcohol or phenols produced. Further, a catalyst usually used in a transesterification reaction to promote the reaction can be used. Examples of the carbonic acid diester used in the transesterification reaction include diphenyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate and the like. Of these, diphenyl carbonate is particularly preferred.

The aromatic polycarbonate resin of the present invention comprises:
As described above, bisphenol M or a mixture of bisphenol M and another aromatic dihydroxy component can be used as the aromatic dihydroxy component, and the aromatic dihydroxy component can be produced according to a known polycarbonate formation reaction.

In the polymerization reaction, monofunctional phenols usually used as a terminal terminator can be used. Particularly, in the case of a reaction using phosgene as a carbonate precursor, monofunctional phenols are generally used as a terminator for controlling the molecular weight, and the obtained aromatic polycarbonate resin has a monofunctional phenol having a terminal at a terminal. Since it is blocked by a group based on, it has better thermal stability than that which is not.

The monofunctional phenol may be any one used as a terminal terminator for an aromatic polycarbonate resin, and is generally phenol or a lower alkyl-substituted phenol, and is a monofunctional phenol represented by the following general formula. Phenols can be indicated.

[0033]

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Wherein A is a hydrogen atom, a linear or branched alkyl or arylalkyl group having 1 to 9 carbon atoms, and r is an integer of 1 to 5, preferably 1 to 3. ]

Specific examples of the monofunctional phenols include, for example, phenol, p-tert-butylphenol, p-cumylphenol and isooctylphenol.

[0036] These monofunctional phenols have at least 5 terminals relative to all terminals of the obtained aromatic polycarbonate resin.
Mole%, preferably at least 10 mol% is desirably introduced at the terminal.

According to the study of the present inventor, aromatic compounds were obtained using phenols having long-chain alkyl groups or aliphatic polyester groups as substituents, or benzoic acid chlorides or long-chain alkylcarboxylic acid chlorides. When the terminal groups of the polycarbonate resin are blocked, it can be seen that these not only function as a terminal terminator or a molecular weight regulator similarly to the monofunctional phenols, but also serve to modify the obtained aromatic polycarbonate resin. Was issued.

That is, phenols having a long-chain alkyl group or aliphatic polyester group as a substituent,
Alternatively, benzoic acid chlorides or long-chain alkyl carboxylic acid chlorides (hereinafter, these may be abbreviated as “terminal modifiers” to distinguish them from the monofunctional phenols) are the terminal of aromatic polycarbonate resin. By bonding to the resin, the melt fluidity of the resin is improved, not only the molding process is facilitated, but also the physical properties of the substrate are improved. In particular, it has the effect of lowering the water absorption of the resin.

The proportion of such a terminal modifier is not constant depending on the composition of the aromatic polycarbonate resin, but is used so as to bind to the terminal at least 5 mol%, preferably at least 10 mol%, based on all terminals. You. The terminal modifier can be used in combination with the monofunctional phenols.

The terminal modifier is represented by the following general formula [I-
a] to [Ih].

[0041]

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[0042]

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[0043]

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[0044]

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[0045]

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[0046]

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[0047]

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[0048]

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[In each formula, X is -RO-, -R-CO-
O- or -RO-CO-, wherein R represents a single bond or a divalent aliphatic hydrocarbon group having 1 to 10, preferably 1 to 5 carbon atoms, and T represents a single bond or It shows the same bond as X, and n shows an integer of 10 to 50.

Q is a halogen atom or C 1-10,
It preferably represents a monovalent aliphatic hydrocarbon group of 1 to 5;
Represents an integer of 0 to 4, Y represents a divalent aliphatic hydrocarbon group having 1 to 10, preferably 1 to 5 carbon atoms, W ¹ represents a hydrogen atom, —CO—R ¹ , —CO—O —R ² or R ³ , wherein R ¹ , R ² and R ³ each have 1 to 1 carbon atoms
10, preferably 1 to 5 monovalent aliphatic hydrocarbon group, 4 to 8 carbon atoms, preferably 5 to 6 monovalent alicyclic hydrocarbon group or 6 to 15 carbon atoms, preferably 6 to 12 carbon atoms. Represents a monovalent aromatic hydrocarbon group.

L represents an integer of 4 to 20, preferably 5 to 10, m represents an integer of 1 to 100, preferably 3 to 60, particularly preferably 4 to 50, and Z represents a single bond or one carbon atom. 10, preferably an 1-5 divalent aliphatic hydrocarbon group, W ² is a hydrogen atom, C1-10, preferably 1 to 5 monovalent aliphatic hydrocarbon group, 4 carbon atoms A monovalent alicyclic hydrocarbon group of from 5 to 8, preferably 5 to 6, or a monovalent aromatic hydrocarbon group of from 6 to 15, preferably from 1 to 12 carbon atoms. ]

The above-mentioned terminal modifiers [Ia] to [I-
h] is preferably [Ia] and [Ib]
Are substituted phenols. As the substituted phenols of [Ia], those having n of 10 to 30, especially 10 to 26 are preferable, and specific examples thereof include decylphenol, dodecylphenol, tetradecylphenol, hexadecylphenol, and octadecyl. Phenol, eicosylphenol, docosylphenol, triacontylphenol and the like can be mentioned.

As the substituted phenols of [Ib], a compound in which X is -R-CO-O- and R is a single bond is suitable, and n is 10 to 30, especially 10 to 26. Are preferred, and specific examples thereof include, for example, decyl hydroxybenzoate, dodecyl hydroxybenzoate,
Examples include tetradecyl hydroxybenzoate, hexadecyl hydroxybenzoate, eicosyl hydroxybenzoate, docosyl hydroxybenzoate and triacontyl hydroxybenzoate.

In the substituted phenols or substituted benzoic chlorides represented by the general formulas [Ia] to [Ig], the position of the substituent is generally preferably the p-position or the o-position, and a mixture of both. Is preferred.

Of the above-mentioned terminal modifiers, [Ia] and [Ib] are particularly excellent. The reason is that, as described above, when these are introduced as a terminal group into the aromatic polycarbonate resin, not only the melt fluidity thereof is improved but also the effect of lowering the water absorption is obtained.

The aromatic polycarbonate resin is prepared by dissolving 0.7 g of the resin in 100 ml of methylene chloride,
Is from 0.2 to 2.0, and preferably from 0.25 to 1.0.
When the specific viscosity is less than 0.2, the molded article becomes brittle, and when the specific viscosity is higher than 2.0, the melt fluidity is poor and molding failure occurs, and it is difficult to obtain a good molded article.

The molded article of the present invention can be obtained by molding the aromatic polycarbonate resin by any method such as an injection molding method, a compression molding method, an extrusion molding method, and a solution casting method. .

The polycarbonate resin of the present invention is particularly suitable for use as an optical disk substrate in ASTM D-0.
It is necessary that the water absorption measured according to 570 is not more than 0.2% by weight, preferably not more than 0.18% by weight.
If the water absorption exceeds 0.2% by weight, the optical disk having the metal film formed on the surface of the optical disk substrate is likely to be warped due to water absorption and to cause a tracking error in some cases. Particularly preferred water absorption is 0.15% by weight or less.

The aromatic polycarbonate resin of the present invention comprises
The total content of the compounds represented by the formulas [X-1] to [X-4] is 0.05% or less, preferably 0.04% or less, and 0.03% or less in the polycarbonate resin. Is more preferred. However, it is difficult to completely remove the compounds represented by the formulas [X-1] to [X-4] (hereinafter sometimes collectively referred to as [X] compounds).
About 0.001% may be contained. When the content exceeds 0.05%, the thermal stability is poor, the hue is deteriorated at the time of melt molding, and the molded product obtained by molding the polycarbonate resin is inferior in appearance, especially when used for an optical disk substrate. Also, the warp, BLER and jitter characteristics of the optical disc deteriorate, which is not preferable.

The compound [X] is a component having a molecular weight of 346, 504, 598 measured by LC-MS, and specifically, 2,4 '-(m-phenylenediisopropylidene) diene. Phenol, 2,2 ′-(m-phenylenediisopropylidene) diphenol and the like [X-1] to
It is a compound represented by the structural formula of [X-4]. The content of these [X] compounds in the polycarbonate resin is a value represented by the ratio (%) of the peak area obtained by decomposing the polycarbonate resin into monomers and analyzing the decomposition product by HPLC.

The compound [X] is an impurity by-produced in the process of producing bisphenol M. As a method for removing such impurities, bisphenol M is dissolved in an alcohol-based, ketone-based or benzene derivative-based solvent, activated carbon or activated clay is added to the solution, followed by filtration, and then the crystallized product is filtered from the filtrate. A method is preferably employed. As alcohol solvents used for such purification, methanol, ethanol, propanol, lower alcohols such as butanol, and ketone solvents as acetone, methyl ethyl ketone, methyl isopropyl ketone,
Lower aliphatic ketones such as cyclohexanone and mixtures thereof are preferred, and toluene, xylene, benzene and mixtures thereof are preferred as benzene derivative solvents. The amount of the solvent used is sufficient as long as bisphenol M is sufficiently dissolved, and is usually about 2 to 10 times the amount of bisphenol M.

In the present invention, the oligomer content is 10
% Or less, preferably 7% or less, particularly preferably 5% or less, is preferably used. The value of the oligomer content is a value measured using the following method and column. That is, Tosoh Corporation
Manufactured by TSKgel G2000HXL and G3000HXL
The retention time of the GPC chart measured by a method of injecting a chloroform solution of the polycarbonate resin after stabilizing at a flow rate of 0.7 ml / min using chloroform as an eluent by connecting each column in series one by one after 19 min. The ratio of the total of the oligomer peak areas to the total peak area is the oligomer content, and this value needs to be 10% or less, preferably 7% or less. If the oligomer content exceeds 7%, especially 10%, the mold surface may be contaminated during molding, and the contamination tends to become more pronounced as the oligomer content increases. On the other hand, the oligomer is generated in the process of producing the aromatic polycarbonate resin and cannot be completely reduced to zero (0).

The content of the oligomer may be not more than the above-mentioned content, and as long as the value is satisfied, a small proportion may be contained. When the oligomer is present in a small content of 0.1% or more, preferably 0.15% or more, the melt fluidity is improved as compared with the oligomer having a small content. Therefore, the oligomer content is particularly preferably in the range of 0.15 to 4%.

In order to control the oligomer content in the aromatic polycarbonate resin within the above range, it is necessary to complete the polymerization sufficiently so that a large amount of the oligomer is not contained in the resin, and to adjust the catalyst and the polymerization conditions. Appropriate selection is required. If the oligomer content exceeds the above range, a treatment for removing the oligomer by means such as extraction is adopted. In this extraction, a solution of an aromatic polycarbonate resin (for example, a methylene chloride solution) is
The method can be carried out by a method of dropping the resin in a poor solvent or non-solvent (for example, acetone or methanol) or a method of immersing the resin in a poor solvent or non-solvent to extract an oligomer.

The aromatic polycarbonate resin of the present invention comprises
When used as an optical disk substrate, particularly a video optical disk substrate, it is preferable that undissolved particles do not exist in a certain amount or more.

That is, a solution obtained by dissolving 20 g of the polycarbonate resin in 1 L of methylene chloride was applied to a liquid particle counter model 4100 manufactured by HAAC Leuco.
Undissolved particles having a diameter of 0.5 μm or more determined by a method of converting scattered light into scattered light of latex particles by a laser sensor method using
It is preferable that the number of undissolved particles having a size of 00 or less and 1 μm or more is 500 or less. If the number of undissolved particles having a size of 0.5 μm or more exceeds 25,000 or the number of undissolved particles having a size of 1 μm or more exceeds 500, information pits written on the optical disk may be adversely affected and the error rate may increase. More preferably, the number of undissolved particles of 0.5 μm or more is 20,000 or less, and the number of undissolved particles of 1 μm or more is 200 or less. Further, it is preferable that undissolved particles having a size of 10 μm or more do not substantially exist.

In order to keep the amount of undissolved particles in the aromatic polycarbonate resin within the above-mentioned range, it is necessary to employ a means by which undissolved particles are not mixed in or removed during the polymerization process and the granulation process.

As such means, for example, the operation is performed in a clean room, and a granulating device equipped with a device for removing undissolved particles is used (specific examples are those used in Example 1 described later). Granulation may be performed by a kneader provided with an isolation chamber having a foreign substance take-out port in a bearing portion, or a device having a structure in which resin particles do not come into contact with sliding portions (eg, a spray dryer type granulator).

As another means for removing undissolved particles, a resin solution is filtered with a small opening filter (0.5 to 0.5).
1 μm) or a method of melting the resin and then removing the solid particles with a metal filter (10 to 40 μm).

The aromatic polycarbonate resin of the present invention comprises:
The total light transmittance is preferably at least 85%, more preferably at least 88%. 85% total light transmittance
If it is lower than this, it is particularly unsuitable as an optical disk substrate.

The value of the birefringence retardation of the aromatic polycarbonate resin at an oblique incidence is 60 nm or less, preferably 40 nm or less.
Suitably, it is less than nm. When the value of the oblique incidence birefringence phase difference exceeds 60 nm, reading of recorded data may be hindered, particularly when used as an optical disk.

The aromatic polycarbonate resin of the present invention comprises:
Its value is 60 × 10 photoelastic constant ^{-1 4} cm ² / ^μN (60
× 10 ⁻¹³ cm ² / dyn) or less, preferably 50 × 10
^-14 cm ² / μN (50 × 10 ^-13 cm ² / dyn) or less is advantageously used. If the value of the photoelastic constant is in the above range, it is suitable as an optical disk.

The aromatic polycarbonate resin of the present invention comprises:
Its glass transition point is preferably from 120 ° C to 180 ° C,
25 ° C to 175 ° C is more preferable, and 130 ° C to 170 ° C
Is more preferred. When the glass transition point is low, the heat resistance as an optical disk substrate is particularly insufficient.

The fluidity of the aromatic polycarbonate resin is preferably at least 25 g / 10 minutes in terms of MFR,
g / 10 min or more is more preferable, and 45 g / 10 min or more is further preferable. If the fluidity is in such a range, the moldability is good and preferable. A fluidity of 100 g / 10 min or less is sufficient.

The aromatic polycarbonate resin of the present invention comprises
When phosgene is used as a carbonate precursor and a chlorinated solvent such as methylene chloride is used as a solvent,
Not a little chlorine remains. If the chlorine content is high, the molding die is corroded, the thermal stability of the aromatic polycarbonate resin is reduced, and the metal film of the optical disk is corroded, which is not desirable. It is therefore recommended that the chlorine content be less than 10 ppm, preferably less than 7 ppm, particularly preferably less than 5 ppm. The term "chlorine content" as used herein means a value obtained by measuring an aromatic polycarbonate resin by a combustion method using a TOX10 total organic halogen analyzer manufactured by Mitsubishi Chemical Corporation.

The aromatic polycarbonate resin of the present invention may optionally contain a phosphorus-based heat stabilizer.
As the phosphorus-based heat stabilizer, phosphites and phosphates are preferably used. As the phosphite,
For example, triphenyl phosphite, trisnonylphenyl phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tridecyl phosphite,
Trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite,
Monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, bis (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-methylene bis (4,6-di-te
rt-butylphenyl) octyl phosphite, distearyl pentaerythritol diphosphite, bis (nonylphenyl) pentaerythritol diphosphite,
Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, tetrakis (2,4-
Examples thereof include triesters, diesters, and monoesters of phosphorous acid such as (di-tert-butylphenyl) -4,4-diphenylenephosphonite. Of these, trisnonylphenyl phosphite, tris (2,4-di-t
tert-butylphenyl) phosphite, distearylpentaerythritol diphosphite, tetrakis (2,4-di-tert-butylphenyl) -4,4-
Diphenylenephosphonite is preferred.

On the other hand, examples of the phosphoric acid ester used as a heat stabilizer include tributyl phosphate, trimethyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenylcresyl phosphate, and diphenylmonoorthoxenyl. Phosphate, tributoxyethyl phosphate, dibutyl phosphate, dioctyl phosphate, diisopropyl phosphate and the like can be mentioned, and among them, triphenyl phosphate and trimethyl phosphate are preferable.

The phosphorus-based heat stabilizers may be used alone or in combination of two or more. The phosphorus-based heat stabilizer is 0.0% based on the aromatic polycarbonate resin.
It is suitable to use in the range of 001 to 0.05% by weight.

To the aromatic polycarbonate resin of the present invention, an antioxidant commonly known for the purpose of preventing oxidation can be added. Examples thereof include phenolic antioxidants, specifically, for example, triethylene glycol-bis (3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate),
1,6-hexanediol-bis (3- (3,5-di-
tert-butyl-4-hydroxyphenyl) propionate, pentaerythritol-tetrakis (3-
(3,5-di-tert-butyl-4-hydroxyphenyl) propionate), octadecyl-3- (3,5
-Di-tert-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-
Tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, N, N-hexamethylenebis (3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5- Di-tert-butyl-
4-hydroxy-benzylphosphonate-diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 3,9-bis {1,1-dimethyl-2- [β- (3- tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] ethyl} -2,4,8,10-tetraoxaspiro (5,5) undecane. The preferable range of the addition amount of these antioxidants is 0.0001 to 0.05% by weight based on the aromatic polycarbonate resin.

Further, a higher fatty acid ester of a polyhydric alcohol can be added to the aromatic polycarbonate resin of the present invention, if necessary. By adding the higher fatty acid ester, the thermal stability of the aromatic polycarbonate resin is improved, the fluidity of the resin at the time of molding is improved, and the releasability of the substrate from the mold after the molding is improved. Deformation of the disk substrate due to defective mold can be prevented. The higher fatty acid ester is preferably a partial ester or a whole ester of a polyhydric alcohol having 2 to 5 carbon atoms and a saturated fatty acid having 10 to 30 carbon atoms. Examples of the polyhydric alcohol include glycols, glycerol and pentaerythritol.

The higher aliphatic acid ester is added in an amount of 0.005 to 2% by weight, preferably 0.02 to 0.1% by weight, based on the aromatic polycarbonate resin. is there.

Additives such as a light stabilizer, a colorant, an antistatic agent and a lubricant can be further added to the aromatic polycarbonate resin of the present invention as long as the transparency is not impaired.
Further, other polycarbonate resins and thermoplastic resins can be added in small proportions within a range not to impair the object of the present invention.

The aromatic polycarbonate resin of the present invention comprises
Optical components such as lenses, prisms, optical cards, optical fibers, and optical disk substrates, sheets, glazing, blow molding, ink binders, foam molding, filaments, wires, electrical insulation materials, OPC binders, headlamp lenses, reflectors It is suitably used for applications such as stretched or unstretched films, and is particularly suitably used as a material for optical disk substrates.

The optical disk substrate formed from the aromatic polycarbonate resin of the present invention can be obtained by forming a metal thin film on one surface thereof. This metal includes aluminum, Tb, Fe, Co, Gd, Si
N, ZnS-SiO _2, GeSbTe, there are ZnS and aluminum alloy, aluminum is suitable.
The thin film can be formed by means such as sputtering and vapor deposition. Means for forming these metal thin films can be performed by a method known per se.

The above-mentioned optical discs are intended for use from audio compact discs (recording density of about 650 MB per disc having a diameter of 12 cm) to high-density discs. For example, the capacity is 4.7G recently for playback only.
B DVD-ROM, recordable / reproducible DVD-R, DV
A capacity of 4.7 GB is being realized in D-RW and DVD-RAM. 5.25 "for MO disks
The size is 5.2GB on both sides and 3.5 "on one side.
Although a 3 GB optical information recording medium has been put on the market, a high-density optical recording medium having a diameter of about 6.5 GB or more, particularly 10 GB or more on one side in terms of a 12 cm diameter disc corresponding to digital high-definition broadcasting has been demanded. The optical disk substrate of the present invention has characteristics that can be sufficiently applied to these substrates. In particular, the optical disk substrate of the present invention is suitable as a substrate for a read-only or high-density information recording medium capable of recording / reproducing, having a single side of about 6.5 GB or more in terms of a disk having a diameter of 12 cm.

[0086]

The present invention will be further described below with reference to examples. Parts in Examples are parts by weight, and% is% by weight. The evaluation was based on the following method.

Specific viscosity : 0.7 g of the polymer was dissolved in 100 ml of methylene chloride and measured at a temperature of 20 ° C.

Glass transition point (Tg) : 91 manufactured by DuPont
It was measured with a type 0 DSC.

Fluidity (MFR) : JIS K-721
Based on 0, the amount (g) of the polymer flowing out at 280 ° C. under a load of 2.16 kg for 10 minutes was measured using a semi-automatic melt indexer manufactured by Toyo Seiki.

Oligomer content : GPC column T manufactured by Tosoh
SKgelG2000HXL and TSKgelG3000
Using HXL, chloroform as eluent at a flow rate of 0.7
While flowing at a rate of 50 ml / min, 50 mg of the sample was added to 5 m of chloroform.
GP obtained by injecting 20 μl of a solution dissolved in
The ratio of the peak area of the oligomer component to the total peak area after the retention time of the C chart of 19 minutes or more is%.
Indicated by

Water absorption : Measured according to ASTM D-0570.

Formulas [X-1] to [X-4]
Content of compound (component [X]) : 2.5 g of polycarbonate resin, 0.035 g of caustic soda and 1 m of methanol
l and 1.5 ml of toluene dissolved in a mixed solvent, and treated at 60 ° C. for 1 hour to decompose the polycarbonate resin. This solution was put into 40 ml of ion-exchanged water to precipitate phenols and dried. Later, Develo
On a column of sil ODS-7, eluent methanol /
Using a mixture of 0.2% aqueous acetic acid and methanol, 50
HPLC at 280 nm with a gradient program
It analyzed and calculated | required by totaling the area% of the component shown by said Formula [X-1]-[X-4].

Methylene chloride undissolved particles : A solution obtained by dissolving 20 g of a polycarbonate resin in 1 L of methylene chloride is a liquid particle counter model 4 manufactured by Haiac Leuco.
It was determined by a method of converting scattered light into scattered light of latex particles by a laser sensor method using No. 100.

Total light transmittance (Tt) : ASTM D-1
The measurement was performed using Nippon Denshoku Sigma 80 in accordance with 003.

Photoelastic constant : Measured with a photoelasticity measuring device PA-150 manufactured by Riken Keiki Co., Ltd.

Oblique incident birefringence phase difference : Measured at an incident angle of 30 ° using an Oak Ellipsometer ADR-200B automatic birefringence measuring device.

Warp : An optical disk having an aluminum film treated on one side was placed in a constant temperature and humidity machine at 80 ° C. and 85% RH.
After standing for 000 hours, the warpage of the substrate was measured using an LM-1200 optical disk inspection device manufactured by Ono Sokki.

BLER : B of optical disk after aluminum film formation
LER (C1 peak) was measured using CDP-3000.

Thermal stability (ΔE) : Cylinder temperature 38 using polycarbonate resin pellets with an injection molding machine (Nippon Steel Works Ltd .: Nikko Anchor V-17-65 type).
Specimens (50 mm square plates with a thickness of 2 mm) were prepared, each of which was kept at 0 ° C. for 10 minutes, and the hue change (ΔE) was measured. The change in hue was measured using a color difference meter (Z1001DP manufactured by Nippon Denshoku Co., Ltd.).
The a and b values were measured and calculated using the following equation. ΔE = [(L′−L) ² + (a′−a) ² + (b′−b)
² ] ^1/2 (L, a, b are not retained, L ', a', b 'are retained for 10 minutes)

Jitter : Optical disk (3
AUDIO DEVELO Jitter at 80 ° C)
The measurement was performed using a CD CATS manufactured by PMENT. The jitter indicates that the smaller the numerical value, the better the signal reproduction accuracy.

Example 1 In a reactor equipped with a thermometer, a stirrer and a reflux condenser, 929.2 parts of ion-exchanged water and 61.3 parts of a 48% aqueous solution of potassium isoda were added, and 1,1-bis (4-hydroxyphenyl) was added. ) -3,
Α, α 'having a content of 0.042% of the X component purified by treating with 39 parts of 3,5-trimethylcyclohexane and activated carbon.
-Bis (4-hydroxyphenyl) -m-diisopropylbenzene 43.6 parts and hydrosulfite 0.
After dissolving 17 parts, 1.51 part of p-tert-butylphenol and 637.9 parts of methylene chloride were added, and 0.09 part of triethylamine was added.
32.4 parts of phosgene was blown in over 40 minutes. After the injection of phosgene, 48% aqueous sodium hydroxide solution 1
5.6 parts were added, and the mixture was stirred at 28 to 33 ° C. for 1 hour to complete the reaction. After completion of the reaction, the product was diluted with methylene chloride, washed with water, acidified with hydrochloric acid, and washed with water. When the conductivity of the aqueous phase became almost the same as that of ion-exchanged water, an isolation chamber having a foreign-matter extraction port in the bearing portion was used. The methylene chloride was evaporated using a kneader provided with the above to obtain 86.4 parts of a colorless polymer having a molar ratio of bisphenol TMC to bisphenol M of 50:50 (yield 97%).

The specific viscosity of this polymer was 0.285, the oligomer content was 2.4%, Tg was 146 ° C., and MFR was 71.
g / 10 minutes. The water absorption was 0.15% by weight. The undissolved particles of methylene chloride were 0.5 μm
More than 14,000 pieces / g, 1 μm or more, 180 pieces / g
Met. Tris (2,4-di-ter)
0.03% of t-butylphenyl) phosphite, 0.005% of trimethyl phosphate, and 0.04% of monoglyceride stearate were added, and pelletized. A resin having a total diameter of 89%, a photoelastic constant of 39 × 10 ⁻¹⁴ cm ² / μN, and a birefringent phase difference of oblique incidence were measured by molding a disc having a thickness of 120 mmΦ and a thickness of 1.2 mm using the pellet. 20 nm. The content of the component [X] is 0.1.
023%, and the value of ΔE was as good as 2.3. The pellets were injection molded into a ROM disk having a diameter of 120 mm and a thickness of 0.6 mm using M-35B-DM manufactured by Meiki Seisakusho Co., Ltd. After sputtering an aluminum film thereon, DVD Bondi manufactured by Matsushita Electric Industrial Co., Ltd.
Two disks were bonded together using ng Machine FA-YG23 to obtain a 10 GB / 12 cm disk. The warpage of this disk is 0.20 mm, the BLER is 44 pieces / sec,
Jitter was 9.2%.

Example 2 The 1,1-bis (4-hydroxyphenyl)-of Example 1
31.2 parts of 3,3,5-trimethylcyclohexane,
Example 1 except that 52.2 parts of α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene was used.
In the same manner as in the above, 86.4 parts of a polymer having a molar ratio of bisphenol TMC to bisphenol M of 40:60 was obtained (96% yield). The specific viscosity of this polymer is 0.2
93, oligomer content 2.5%, Tg 135 ° C, M
FR was 89 g / 10 min. The water absorption is 0.12
% By weight.

This polymer was molded in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The undissolved particles of methylene chloride having a particle size of 0.5 μm or more were 13,000 particles / g.
The number of particles having a particle diameter of 1 μm or more was 150 particles / g. The total light transmittance is 89%, the photoelastic constant is 40 × 10 ⁻¹⁴ cm ² / μN, the oblique incidence birefringence phase difference is 23 nm, the content of the [X] component is 0.026%, and ΔE is 2. 2, warpage is 0.14mm, B
The LER was 35 / sec, and the jitter was as good as 9.0%.

Example 3 The 1,1-bis (4-hydroxyphenyl)-of Example 1
46.8 parts of 3,3,5-trimethylcyclohexane,
α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene was 34.9 parts, and p-tert-
The molar ratio of bisphenol TMC to bisphenol M was the same as in Example 1 except that 3.8 parts of an alkylphenol having 23 carbon atoms (a mixture of 70% ortho-substituted and 30% para-substituted) was used instead of butylphenol. 86.4 parts of polymer having a ratio of 60:40 (94% yield)
I got The specific viscosity of this polymer is 0.276, the oligomer content is 2.9%, the Tg is 133 ° C., and the MFR is 68 g /
10 minutes. The water absorption was 0.16% by weight.

When this polymer was molded in the same manner as in Example 1 and evaluated in the same manner as in Example 1, the number of undissolved particles in methylene chloride was 15,000 particles / g for 0.5 μm or more and 160 particles / g for 1 μm or more. there were. The total light transmittance is 89%, the photoelastic constant is 38 × 10 ⁻¹⁴ cm ² / μN, the oblique incidence birefringence phase difference is 20 nm, the content of the [X] component is 0.020%,
ΔE was 2.4, the warpage was 0.22 mm, the BLER was 35 / sec, and the jitter was 8.7%.

Example 4 In the same apparatus as in Example 1, 945 parts of ion-exchanged water and 48.
62.5 parts of a 5% aqueous sodium hydroxide solution was charged, and 1,1-bis (4-hydroxyphenyl) -3,
24 parts of 3,5-trimethylcyclohexane, 9 parts of 9,9-bis (4-hydroxyphenyl) fluorene
Abbreviated as bisphenolfluorene),
After dissolving 53.6 parts of α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene, 649 parts of methylene chloride are added, and 1.15 parts of p-tert-butylphenol and 0.09 parts of triethylamine are added. With vigorous stirring, 33 parts of phosgene was blown in at 40 ° C. for about 40 minutes to cause a reaction. Next, the internal temperature was raised to 30 ° C., 16 parts of a 48.5% aqueous sodium hydroxide solution was added, and stirring was continued for 1 hour to complete the reaction.

This was purified in the same manner as in Example 1 to obtain a polymer having a molar ratio of bisphenol TMC, bisphenol M and bisphenol fluorene of 30:60:10. The specific viscosity of this polymer is 0.303, the oligomer content is 3.7%, the MFR is 58 g / 10 min, the Tg
Was 150 ° C. The water absorption was 0.13% by weight. The polymer was molded and evaluated in the same manner as in Example 1. As a result, the number of undissolved particles of methylene chloride was 15,000 particles / g for 0.5 μm or more and 170 particles / g for 1 μm or more. The total light transmittance is 89% and the photoelastic constant is 40 ×
10 ^-14 cm ² / μN, oblique incidence birefringence phase difference is 37n
m, the content of the [X] component is 0.027%, and ΔE is 2.
4. The warpage was 0.16 mm, the BLER was 36 / sec, and the jitter was 9.1%.

Example 5 In the same apparatus as in Example 1, 1009 parts of ion-exchanged water, 48
122 parts of an aqueous sodium hydroxide solution, 101.3 parts of α, α'-bis (4-hydroxyphenyl) -m-diisopropylbenzene of Example 1 and 9,9-bis (4-
(Hydroxy-3-methylphenyl) fluorene 73.8
Parts and 0.4 parts of hydrosulfite,
365 parts of methylene chloride were added, and 55.6 parts of phosgene were blown in at 15 to 20 ° C with stirring over 40 minutes. After the injection of phosgene was completed, 3.1 parts of p-tert-butylphenol and 20.3 parts of a 48% aqueous sodium hydroxide solution were added and emulsified, followed by adding 0.13 parts of triethylamine to give 2 parts.
The reaction was completed by stirring at 8 ° C. to 33 ° C. for 1 hour. This was purified in the same manner as in Example 1 to obtain 185 parts of a polymer having a molar ratio of bisphenol M to biscresol fluorene of 60:40 (yield: 96%).

The specific viscosity of this polymer was 0.245, the oligomer content was 3.8%, Tg was 143 ° C., and MFR was 65%.
g / 10 minutes. The water absorption was 0.09% by weight. When this polymer was evaluated for molding in the same manner as in Example 1, the number of undissolved methylene chloride particles was 14,000 particles / g for 0.5 μm or more and 150 particles / g for 1 μm or more. The total light transmittance is 89% and the photoelastic constant is 49 × 1.
0 ^-14 cm ² / μN, oblique incidence birefringence phase difference is 24 nm,
The content of the component [X] was 0.025%, ΔE was 2.3, warpage was 0.21 mm, BLER was 40 / sec, and jitter was 9.2%.

Example 6 In Example 5, 101.3 parts of α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene was added to 50.7 parts, and 9,9-bis (4-hydroxy-3) was added. -Methylphenyl) fluorene instead of 73.8 parts
Bisphenol M was prepared in the same manner as in Example 5 except that 77.9 parts of -bis (4-hydroxyphenyl) propane was used.
Thus, 138.5 parts of a polymer having a molar ratio of bisphenol A to bisphenol A of 30:70 was obtained (98% yield).

The specific viscosity of this polymer was 0.349, the oligomer content was 2.8%, Tg was 135 ° C., and MFR was 50%.
g / 10 minutes. The water absorption was 0.20% by weight. When this polymer was evaluated for molding in the same manner as in Example 1, the number of undissolved particles of methylene chloride was 13,000 particles / g for 0.5 μm or more and 140 particles / g for 1 μm or more. The total light transmittance is 89% and the photoelastic constant is 60 × 1.
0 ^-14 cm ² / μN, oblique incidence birefringence phase difference is 40 nm,
The content of the component [X] was 0.014%, ΔE was 2.8, warpage was 0.25 mm, BLER was 43 pieces / sec, and jitter was 9.5%.

Comparative Example 1 The procedure of Example 1 was repeated except that α, α′-bis (4-hydroxyphenyl) -m-diisopropylbenzene having a content of 0.11% of the X component which was not treated with activated carbon was used. In the same manner as in Example 1, a colorless polymer having a molar ratio of bisphenol TMC to bisphenol M of 50:50 was obtained. The specific viscosity of this polymer is 0.283, the oligomer content is 2.5%, Tg is 144 ° C., and MFR is 7
It was 4 g / 10 minutes. The water absorption was 0.15% by weight.

The polymer was molded in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The undissolved particles of methylene chloride having a particle size of 0.5 μm or more were 16,000 particles / g.
The value of 1 μm or more was 195 particles / g. The total light transmittance was 89%, the photoelastic constant was 40 × 10 ⁻¹⁴ cm ² / μN, the oblique incidence birefringence phase difference was 26 nm, the warpage was 0.32 mm,
BLER was 57 pieces / sec. The content of the component [X] was 0.06%, ΔE was 3.7, which was inferior to thermal stability, and jitter was 15.0%, which was worse.

[0115]

[Table 1]

[0116]

According to the method of the present invention, an aromatic polycarbonate resin having good thermal stability during molding and an optical disk substrate formed from the aromatic polycarbonate resin having particularly excellent optical characteristics can be obtained. It is suitably used as a video optical disk.

Continuing on the front page F-term (reference) 4F071 AA50 AA86 AA88 AF14 AF35 AF43 BA01 BA09 BB05 BC01 BC12 4J029 AA10 AB01 AB07 AC01 AC02 AD01 AD07 AE01 AE02 AE03 AE04 AE05 AE11 BB12B BB12C BB16A FA07 HC04 FA05

Claims (6)

[Claims] 1. An aromatic polycarbonate resin in which at least 2 mol% of a wholly aromatic dihydroxy component is a compound represented by the following general formula (1): (A) an aromatic polycarbonate resin defined in the text contained in the polycarbonate resin. The total content of the compounds represented by the following general formulas [X-1] to [X-4] measured by the above method is 0.05% or less;
(B) An aromatic polycarbonate resin having a specific viscosity in the range of 0.2 to 2.0 measured at 20 ° C of a solution obtained by dissolving 0.7 g of the polycarbonate resin in 100 ml of methylene chloride. Embedded image Embedded image Embedded image Embedded image Embedded image 2. The compound represented by the formula (1) wherein 3 to 99 mol% of the wholly aromatic dihydroxy component is the compound represented by the formula (1).
The aromatic polycarbonate resin according to the above. 3. The aromatic polycarbonate resin,
(A) a compound represented by the formula (1) (component a) and (b) 1,1-bis (4-hydroxyphenyl) -3,
3,5-trimethylcyclohexane, 9,9-bis (4
-Hydroxy-3-methylphenyl) fluorene and at least one compound selected from the group consisting of 2,2-bis (4-hydroxyphenyl) propane (component b)
Is at least 80 mol% of the total aromatic dihydroxy component, and the ratio of the component a to the component b is 2:98 to 9 in a molar ratio.
The aromatic polycarbonate resin according to claim 1, wherein the ratio is 5: 5. 4. The aromatic polycarbonate resin according to claim 1, wherein the glass transition point of the aromatic polycarbonate resin is 120 ° C. to 180 ° C. 5. A molded article formed from the aromatic polycarbonate resin according to claim 1. 6. An optical disk substrate formed from the aromatic polycarbonate resin according to claim 1.