JP2000169573A - New polycarbonate resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polycarbonate resin having a low photoelastic coefficient and a practically usable impact resistance. SOLUTION: The structural unit represented by the structural formula (1) and the structural unit represented by the structural formula (2) which contain the structural formulas (1) and (2) as the structural units and are included as the structural units. The molar ratio of (1) / (2) is from 70/30 to 5
/ 95 polycarbonate resin. Embedded image (Wherein, R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, An aryl group having 6 to 20 carbon atoms, a cycloalkoxyl group having 6 to 20 carbon atoms or 6 to 20 carbon atoms
Represents an aryloxy group. Further, m and n represent an integer of 0 to 4. )

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to transparency, heat resistance,
The present invention relates to a polycarbonate resin having a low photoelastic coefficient and impact resistance and a method for producing the same. This polycarbonate resin can be suitably used as a material for plastic optical products such as optical disc substrates, various lenses, prisms, and optical fibers.

[0002]

2. Description of the Related Art A conventional aromatic polycarbonate resin obtained by reacting 2,2-bis (4-hydroxyphenyl) propane (commonly known as bisphenol A) with phosgene or a carbonic ester is excellent in heat resistance and transparency, and Because of its excellent mechanical properties such as impact resistance, it is widely used as an optical material as well as an optical disc substrate, various lenses, prisms, optical fibers, and the like as well as a structural material.

However, the conventional aromatic polycarbonate resin has a problem that since it is a material having a high photoelastic coefficient and low fluidity, birefringence accompanying molecular orientation and residual stress during molding is large. Therefore, when molding an optical material made of a conventional aromatic polycarbonate resin, use a resin having a relatively low molecular weight to improve fluidity,
In addition, a method of reducing birefringence of a product by molding at a high temperature has been performed. However, with conventional aromatic polycarbonate resins, there is a limit to the reduction of birefringence even with the use of the above-described means. There is a strong demand for the development of materials with high elasticity and high fluidity.

As a method for reducing the photoelastic coefficient of a polycarbonate resin, for example, Japanese Patent Application Laid-Open No. 64-66234 discloses a method.
As shown in the publication, a method of copolymerizing bisphenol A with tricyclo (5.2.1.0 ^2,6 ) decane dimethanol is known, but it causes a decrease in heat resistance,
Further, a sufficient effect in reducing the photoelastic coefficient has not been obtained. Further, as disclosed in JP-A-6-25398 or JP-A-7-109342, a method of copolymerizing a bisphenol having a fluorene structure in a side chain with another bisphenol is known. In order to lower the photoelastic constant, fluorene structure-containing bisphenols are used in a high ratio,
It has a problem that the glass transition point is high and the fluidity at the time of melting is low, it is difficult to mold into a thin molded body such as an optical disk substrate, and the impact resistance is low. .

[0005]

SUMMARY OF THE INVENTION The present invention aims to solve the problems associated with the prior art as described above, and has a lower photoelastic coefficient than conventional aromatic polycarbonate resins. Another object of the present invention is to provide a polycarbonate resin having impact resistance sufficient for practical use and a method for producing the same.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies on a method for overcoming the above-mentioned problems, and as a result, they have structural formulas (1) and (2) as constituent units, A polycarbonate resin having a molar ratio (1) / (2) of the structural unit represented by (1) to the structural unit represented by the structural formula (2) of 70/30 to 5/95 solves the above-mentioned problem. The inventors have found out what can be done and have reached the present invention.

[0007]

Embedded image (Wherein, R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, An aryl group having 6 to 20 carbon atoms, a cycloalkoxyl group having 6 to 20 carbon atoms or 6 to 20 carbon atoms
Represents an aryloxy group. Further, m and n represent an integer of 0 to 4. )

[0008]

Embedded image

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the polycarbonate resin according to the present invention will be specifically described.

The polycarbonate resin according to the present invention comprises an aromatic dihydroxy compound represented by the general formula (4) and an aliphatic dihydroxy compound represented by the general formula (5):
It is obtained by polycondensation with a carbonic acid diester.

[0011]

Embedded image (Wherein, R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, An aryl group having 6 to 20 carbon atoms, a cycloalkoxyl group having 6 to 20 carbon atoms or 6 to 20 carbon atoms
Represents an aryloxy group. Further, m and n represent an integer of 0 to 4. )

[0012]

Embedded image

The aromatic dihydroxy compounds represented by the general formula (4) include 9,9-bis (4-hydroxyphenyl) fluorene and 9,9-bis (4-hydroxy-3).
-Methylphenyl) fluorene, 9,9-bis (4-hydroxy-3-ethylphenyl) fluorene and the like are used.

The aliphatic dihydroxy compound represented by the general formula (5) is tricyclo (5.2.1.0 ^2.6 ) decanedimethanol.

In the present invention, the molar ratio of the structural units derived from the aromatic dihydroxy compound represented by the general formula (4) and the aliphatic dihydroxy compound represented by the general formula (5) is (1) / ( 2) is 70/30 to 5/95
And more preferably 60/40 to 20/80. That is, when the molar ratio (1) / (2) of the structural units respectively derived from the aromatic dihydroxy compounds (4) and (5) in the polycarbonate resin is higher than 70/30, the glass transition temperature increases. It is not preferable because the fluidity during molding decreases. In addition, if the molecular weight is kept low in order to improve the fluidity at the time of molding, the impact resistance of the molded article is undesirably reduced. On the other hand, if the ratio is lower than 5/95, the glass transition temperature becomes low, heat resistance is lowered, and it becomes difficult to withstand practical use, which is not preferable.

In the polycarbonate resin according to the present invention, a structural unit derived from an aromatic dihydroxy compound represented by the above general formula (4) and an aliphatic dihydroxy compound represented by the general formula (5), and a diester carbonate It is more preferable to introduce a structural unit derived from an aromatic dydoxy compound represented by the following general formula (6) in addition to a structural unit derived from

[0017]

Embedded image (Where X is R ₅ and R ₆ are each independently a hydrogen atom,
An alkyl group having 1 to 10 carbon atoms or 6 to 10 carbon atoms
And R ₅ and R ₆ may combine with each other to form a ring. R ₃ and R ₄ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, Represents an aryl group, a cycloalkoxyl group having 6 to 20 carbon atoms or an aryloxy group having 6 to 20 carbon atoms. P and q represent an integer of 0 to 4. )

As the aromatic dihydroxy compound represented by the general formula (6), bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxy Phenyl) propane, 2,2-bis (4-hydroxyphenyl) butane,
2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 1,1
-Bis (4-hydroxyphenyl) -1-phenylethane, bis (4-hydroxyphenyl) diphenylmethane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxy- 3-t
tert-butylphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3-phenylphenyl) propane, 2,2-bis (3 -Cyclohexyl-
4-hydroxyphenyl) propane, 2,2-bis (4
-Hydroxy-3-bromophenyl) propane, 2,2
-Bis (3,5-dibromo-4-hydroxyphenyl)
Propane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, 2,2-bis (4-hydroxy-
3-methoxyphenyl) propane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-
3,3′-dimethylphenyl ether, 4,4′-dihydroxyphenyl sulfide, 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide, 4,4 ′
-Dihydroxydiphenylsulfoxide, 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfoxide, 4,4'-dihydroxydiphenylsulfone, 4,
4'-dihydroxydiphenylsulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenylsulfone and the like are used.

In the polycarbonate resin of the present invention, the impact resistance can be improved by including the structural unit (3) derived from the aromatic dihydroxy compound represented by the general formula (6). A structural unit (1) derived from an aromatic dihydroxy compound represented by the general formula (4) and a structural unit (2) derived from an aliphatic dihydroxy compound represented by the general formula (5)
The molar ratio (3) / [(1) + (2)] is 50
/ 50 to 10/90. 50/50
If it is larger, the photoelastic coefficient increases, which is not preferable. On the other hand, if the ratio is smaller than 10/90, the effect of improving the impact resistance is undesirably reduced.

In the present invention, the aromatic dihydroxy compound represented by the general formula (6) is preferably 2,2 '.
-Bis (4-hydroxyphenyl) propane (commonly known as bisphenol A) is preferably used. Bisphenol A
Is very useful because it is mass-produced at low cost as a polycarbonate resin raw material, and when bisphenol A is used, the impact resistance can be greatly increased without impairing the heat resistance.

The polycarbonate resin according to the present invention comprises:
It contains at least a structural unit derived from an aromatic dihydroxy compound represented by the general formula (4) and a structural unit derived from an aliphatic dihydroxy compound represented by the general formula (5), and has a general formula (6) Including a predetermined proportion of structural units derived from an aromatic dihydroxy compound represented by the formula, random, block, or because it contains an alternating copolymer structure, low photoelastic coefficient, high impact resistance, high heat resistance Show.

As the polycarbonate resin in the present invention, a resin having a photoelastic coefficient of 50 × 10 ⁻¹² m ² / N or less is preferable, and more preferably 40 × 10 ⁻¹² m ² / N.
/ N. If the photoelastic coefficient exceeds 50 × 10 ⁻¹² m ² / N, the birefringence increases, and for example, when used as an optical disk substrate, adverse effects such as an increase in signal reading error occur, which is not preferable.

The glass transition temperature of the polycarbonate resin in the present invention is preferably from 110 ° C. to 200 ° C., more preferably from 110 ° C. to 160 ° C.
It is as follows. If the glass transition temperature is lower than 110 ° C., heat resistance deteriorates, and the use environment is limited, which is not preferable. On the other hand, if the glass transition temperature is higher than 200 ° C., the fluidity deteriorates, and it becomes difficult to obtain optical uniformity of the molded product, which is not preferable. It is not preferable because the property is lowered.

The carbonic acid diester used in the present invention includes diphenyl carbonate, ditolyl carbonate,
Bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, dimethyl carbonate, diethyl carbonate, dibutyl carbonate, dicyclohexyl carbonate and the like can be mentioned. Among these, diphenyl carbonate is particularly preferred. Diphenyl carbonate is used in an amount of 0.9 to 1 mol of the total of the aromatic dihydroxy compound and the aliphatic dihydroxy compound.
It is preferably used in a ratio of 7 to 1.10 mol,
The ratio is more preferably 0.98 to 1.03 mol.

The polycarbonate resin used in the present invention has a polystyrene equivalent weight average molecular weight of 20,000 to 2
00,000, more preferably 4
It is between 000 and 130,000. If the weight average molecular weight in terms of polystyrene is 20,000 or less, the impact resistance becomes low, and if it is 200,000 or more, the fluidity becomes poor, which is not preferable.

In the method for producing a polycarbonate resin according to the present invention, a basic compound is used as a catalyst.
Examples of such a basic compound include an alkali metal compound and / or an alkaline earth compound, and a nitrogen-containing compound.

Such compounds include organic acid salts such as alkali metal and alkaline earth metal compounds, inorganic salts, oxides, hydroxides, hydrides or alkoxides, quaternary ammonium hydroxides and salts thereof,
Amines and the like are preferably used, and these compounds can be used alone or in combination.

As such an alkali metal compound,
Specifically, sodium hydroxide, potassium hydroxide, cesium hydroxide, lithium hydroxide, sodium hydrogen carbonate, sodium carbonate, potassium carbonate, cesium carbonate, lithium carbonate, sodium acetate, potassium acetate, cesium acetate,
Lithium acetate, sodium stearate, potassium stearate, cesium stearate, lithium stearate, sodium borohydride, sodium borohydride, sodium benzoate, potassium benzoate, cesium benzoate, lithium benzoate, hydrogen hydrogen phosphate 2 Sodium, 2 potassium hydrogen phosphate, 2 lithium hydrogen phosphate,
Disodium phenylphosphate, disodium salt of bisphenol A, 2 potassium salt, 2 cesium salt, 2 lithium salt, phenol sodium salt, potassium salt, cesium salt, lithium salt and the like are used.

Further, as the alkaline earth metal compound,
Specifically, magnesium hydroxide, calcium hydroxide,
Strontium hydroxide, barium hydroxide, magnesium hydrogen carbonate, calcium hydrogen carbonate, strontium hydrogen carbonate, barium hydrogen carbonate, magnesium carbonate, calcium carbonate, strontium carbonate, barium carbonate, magnesium acetate, calcium acetate, strontium acetate, barium acetate, stearic acid Magnesium, calcium stearate, calcium benzoate, magnesium phenyl phosphate and the like are used.

Examples of the nitrogen-containing compound include alkyl, aryl, tetraalkylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide and trimethylbenzylammonium hydroxide. Quaternary ammonium hydroxides having an araryl group and the like, tertiary amines such as triethylamine, dimethylbenzylamine and triphenylamine, secondary amines such as diethylamine and dibutylamine, primary amines such as propylamine and butylamine,
Imidazoles such as 2-methylimidazole and 2-phenylimidazole, or basic salts such as ammonia, tetramethylammonium borohydride, tetrabutylammonium borohydride, tetrabutylammonium tetraphenylborate, and tetraphenylammonium tetraphenylborate; Used.

These catalysts are used in a ratio of 10 ^-9 to 10 ^-3 mol, preferably 10 ^-7 to 10 ^-3 mol, per mol of the aromatic dihydroxy compound and the aliphatic dihydroxy compound in total.
It is used in a proportion of 10 ^-5 mol.

The transesterification according to the present invention can be carried out by a known melt polycondensation method. That is, melt polycondensation is carried out using the above-mentioned raw materials and a catalyst while removing by-products by transesterification under heating at normal pressure or reduced pressure. The reaction is generally carried out in two or more stages.

Specifically, the first-stage reaction is carried out at 120 to 2
The reaction is carried out at a temperature of 60 ° C., preferably 180-240 ° C., generally for 0.1-5 hours, preferably 0.5-3 hours. Next, the reaction temperature was increased while increasing the degree of vacuum of the reaction system, and the reaction of the aromatic dihydroxy compound, the aliphatic dihydroxy compound, and the carbonic acid diester was performed.
The polycondensation reaction is performed at a temperature of 200 to 300 ° C. under a reduced pressure of Hg or less. Such a reaction may be performed in a continuous manner,
Also, it may be performed in a batch system. The reaction apparatus used for performing the above reaction was equipped with paddle wings, lattice wings, spectacle wings, etc., even if it was a vertical type equipped with an anchor type stirring blade, a max blend stirring blade, a helical ribbon type stirring blade, and the like. It may be a horizontal type or an extruder type equipped with a screw. Further, when performing the reaction continuously, it is more preferable to use a reaction apparatus in which these are appropriately combined.

In the polycarbonate according to the present invention, the catalyst is removed or deactivated after the polymerization reaction in order to maintain heat stability and hydrolysis stability. In general,
A method of deactivating a transesterification catalyst such as an alkali metal or an alkaline earth metal by adding a known acidic substance is suitably performed. Specific examples of these substances include aromatic sulfonic acids such as p-toluenesulfonic acid and p-toluenesulfonic acid.
Aromatic sulfonic acid esters such as butyl toluenesulfonate and hexyl p-toluenesulfonate, organic halides such as stearic acid chloride, benzoyl chloride, p-toluenesulfonic acid chloride, alkyl sulfates such as dimethyl sulfate, benzyl chloride and the like Are preferably used.

After deactivation of the catalyst, a step of devolatilizing and removing low-boiling compounds in the polymer at a pressure of 0.1 to 1 mmHg and a temperature of 200 to 300 ° C. may be provided. A horizontal device equipped with a stirring blade having an excellent surface renewing ability, such as a wing or an eyeglass wing, or a thin film evaporator is preferably used.

Further, in the present invention, the above heat stabilizer,
In addition to hydrolysis stabilizers, antioxidants, pigments, dyes, reinforcing agents and fillers, ultraviolet absorbers, lubricants, release agents, nucleating agents,
Plasticizers, flow improvers, antistatic agents, antibacterial agents and the like can be added.

The above-mentioned additives may be added while the polycarbonate resin obtained by the melt polycondensation is in a molten state immediately after the reaction, or may be added again after pelletizing the polycarbonate resin. Further, a plurality of additives may be added at different addition times.

When added to the molten resin immediately after the reaction, it is added to the resin extracted from the reaction vessel, fed into a horizontal kneader, uniformly kneaded, and then pelletized as it is, or from the reaction vessel. A method is preferably used in which the extracted resin is fed into a horizontal kneader, added by side feed from the middle of the kneader, uniformly kneaded, and then pelletized as it is.

When added to the pelletized resin,
After the pellets and the above additives are dispersed and mixed by a high-speed mixer represented by a turnbull mixer, a Henschel mixer, a ribbon blender, or a super mixer, a method of melt kneading with a kneading machine such as an extruder, a Banbury mixer, and a mixing roll is appropriately selected. Is done.

[0040]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.

Example 1 2,2-bis (4-hydroxyphenyl) propane 1
3.7 g (0.06 mol), 9,9-bis (4-hydroxy-3-methylphenyl) fluorene 7.57 g
(0.02 mol), tricyclo (5.2.1.0 ^2.6 )
23.6 g (0.12 mol) of decane dimethanol, 43.4 g (0.2 mol) of diphenyl carbonate, and 5 × 10 ⁻⁵ g (6 × 10 ⁻⁷ mol) of sodium hydrogencarbonate were equipped with a stirrer and a distilling device. Into a 300 ml four-necked flask with a nitrogen atmosphere of 760 mmHg.
C. and stirred for 30 minutes.

Thereafter, the degree of vacuum was adjusted to 150 mmHg, and at the same time, the temperature was raised to 200 ° C. at a rate of 60 ° C./hr, and the temperature was maintained for 40 minutes to carry out transesterification. Further, the temperature was raised to 225 ° C. at a rate of 75 ° C./hr.
The degree of reduced pressure was reduced to 1 mmHg or less over time. Then 1
The temperature was raised to 260 ° C. at a rate of 05 ° C./hr, and the reaction was carried out under stirring for a total of 7 hours. After the reaction was completed, nitrogen was blown into the reactor to return to normal pressure, and the produced polycarbonate was taken out. Table 1 shows the measurement results of the physical properties of the polycarbonate resin.

Example 2 In Example 1, 20.5 g (0.09 mol) of 2,2-bis (4-hydroxyphenyl) propane, 9,9-
Bis (4-hydroxy-3-methylphenyl) fluorene (11.4 g, 0.03 mol), tricyclo (5.2.
1.0 ^2.6 ) 15.7 g of decandimethanol (0.08
Mol)), except for using the same compound. Table 1 shows the measurement results of physical properties of the obtained polycarbonate resin.

Example 3 In Example 1, 9.15 g (0.04 mol) of 2,2-bis (4-hydroxyphenyl) propane, 9,9-
15.1 g (0.04 mol) of bis (4-hydroxy-3-methylphenyl) fluorene, tricyclo (5.2.
^1.02.6 ) 23.6 g of decandimethanol (0.12
Mol)), except for using the same compound. Table 1 shows the measurement results of physical properties of the obtained polycarbonate resin.

Example 4 In Example 1, 9,9-bis (4-hydroxy-3
-Methylphenyl) fluorene (22.7 g, 0.06 mol) and tricyclo (5.2.1.0 ^2.6 ) decanedimethanol 27.5 g (0.14 mol) were used to give 2,2-
The same operation as in Example 1 was performed except that bis (4-hydroxyphenyl) propane was not used. Table 1 shows the measurement results of physical properties of the obtained polycarbonate resin.

Comparative Example 1 In Example 1, 45.7 g (0.2 mol) of 2,2-bis (4-hydroxyphenyl) propane was used.
9,9-bis (4-hydroxy-3-methylphenyl)
The same operation as in Example 1 was performed, except that fluorene and tricyclo (5.2.1.0 ^2.6 ) decanedimethanol were not used. Table 1 shows the measurement results of physical properties of the obtained polycarbonate resin.

Comparative Example 2 In Example 1, tricyclo (5.2.1.0 ^2.6 )
Except for using 39.3 g (0.20 mol) of decane dimethanol and not using 2,2-bis (4-hydroxyphenyl) propane and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene. The same operation as in Example 1 was performed. Table 1 shows the measurement results of physical properties of the obtained polycarbonate resin.

Comparative Example 3 In Example 1, 2,2-bis (4-hydroxyphene
Nyl) propane 34.2 g (0.15 mol), 9,9-
Bis (4-hydroxy-3-methylphenyl) fluore
Using 18.9 g (0.05 mol) of tricyclo
(5.2.1.0 ^2.6) Use decandimethanol
After reducing the degree of vacuum to 1 mmHg or less,
/ Hr at a rate of 280 ° C and stirring for a total of 7 hours.
The same operation as in Example 1 was performed except that the reaction was performed.
Table 1 shows the measurement results of the physical properties of the obtained polycarbonate resin.
Show.

The physical properties in Table 1 are measured by the following methods. 1) Weight average molecular weight (Mw) in terms of polystyrene: Measured by GPC using chloroform as a developing solvent and monodisperse polystyrene having a known molecular weight as a standard substance. 2) Glass transition temperature (Tg): measured by a differential scanning calorimeter. 3) Thermal decomposition onset temperature (Td): 1 in a nitrogen stream with a thermobalance
% Temperature at which the weight was reduced. The rate of temperature rise is 10 ° C./min. 4) Photoelastic coefficient: thickness 100 by ellipsometer
Using a cast film of μm, it was calculated from the birefringence measurement with respect to a change in load at a wavelength of 633 nm. 5) Falling ball impact strength: A steel ball was dropped naturally from a height of 127 cm onto a pressed test specimen having a diameter of 40 mm and a thickness of 3 mm, and the weight was represented by the weight of the largest steel ball that did not destroy the test specimen.

In Table 1, the following abbreviations were used as compound names. BPA: 2,2-bis (4-hydroxyphenyl) propane BCF: 9,9-bis (4-hydroxy-3-methylphenyl) fluorene TCDDM: tricyclo (5.2.1.0 ^2.6 ) decanedimethanol

[0051]

[Table 1]

[0052]

The polycarbonate resin according to the present invention comprises:
Excellent transparency and heat resistance of aromatic polycarbonate resin,
A new aromatic-aliphatic copolymer polycarbonate resin with low photoelastic coefficient while maintaining properties such as impact resistance, and is extremely useful as a material for plastic optical products such as optical disc substrates, various lenses, prisms, and optical fibers. Available to

Continued on front page F-term (reference) 2H050 AB42Z AB50Z 4J029 AA09 AB01 AB04 AC02 AE05 BB13B BD10 BE05B BE07 BF14B BG08X BH02 DB07 DB11 DB13 HC04A HC05A HC05B JA091 JA121 JA261 JB171 JB201 JC031 JC1JF1J05 JF1J01J05F1 KE02 KE06 5D029 KA07 KC07 KC10

Claims (9)

[Claims] 1. A structural unit represented by the structural formula (1) and a structural unit represented by the structural formula (2) which contain the structural formulas (1) and (2) as structural units and are included as structural units. And the molar ratio (1) / (2) is from 70/30 to 5
/ 95 polycarbonate resin. Embedded image (Wherein, R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, An aryl group having 6 to 20 carbon atoms, a cycloalkoxyl group having 6 to 20 carbon atoms or 6 to 20 carbon atoms
Represents an aryloxy group. Further, m and n represent an integer of 0 to 4. ) 2. The structural unit represented by the structural formulas (1) and (2) and the structural unit represented by the structural formula (3), and the structural unit represented by the structural formula (3) and the structural formula (1) And the molar ratio with the structural unit represented by (2) (3) /
The polycarbonate resin according to claim 1, wherein [(1) + (2)] is from 50/50 to 10/90. Embedded image (Where X is R ₅ and R ₆ are each independently a hydrogen atom,
An alkyl group having 1 to 10 carbon atoms or 6 to 10 carbon atoms
And R ₅ and R ₆ may combine with each other to form a ring. R ₃ and R ₄ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, Represents an aryl group, a cycloalkoxyl group having 6 to 20 carbon atoms or an aryloxy group having 6 to 20 carbon atoms. P and q represent an integer of 0 to 4. ) 3. The polycarbonate resin according to claim 1, which has a photoelastic coefficient of 50 × 10 ⁻¹² m ² / N or less. 4. The polycarbonate resin according to claim 2, wherein R ₅ and R ₆ in the structural formula (3) are a methyl group. 5. A compound represented by the general formula (4), the general formula (5) and a carbonic acid diester, or the general formula (4) or the general formula (5)
And a method for producing a polycarbonate resin in which the general formula (6) and a carbonic acid diester are melt-polycondensed in the presence of a basic compound catalyst. Embedded image (Wherein, R ₁ and R ₂ each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, An aryl group having 6 to 20 carbon atoms, a cycloalkoxyl group having 6 to 20 carbon atoms or 6 to 20 carbon atoms
Represents an aryloxy group. Further, m and n represent an integer of 0 to 4. ) Embedded image (Where X is R ₅ and R ₆ are each independently a hydrogen atom,
An alkyl group having 1 to 10 carbon atoms or 6 to 10 carbon atoms
And R ₅ and R ₆ may combine with each other to form a ring. R ₃ and R ₄ are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxyl group having 1 to 20 carbon atoms, a cycloalkyl group having 6 to 20 carbon atoms, Represents an aryl group, a cycloalkoxyl group having 6 to 20 carbon atoms, or an aryloxy group having 6 to 20 carbon atoms. P and q represent an integer of 0 to 4. ) 6. The total amount of aromatic dihydroxy compounds (4) and (5) and aliphatic dihydroxy compound (6) is 1.
^{6. The} process for producing a polycarbonate resin according to claim 5, wherein a catalyst comprising 10 ^-9 to 10 ^-3 mol of a basic compound is used per mol. 7. The aromatic dihydroxy compound represented by the general formula (6), wherein R ₅ and R ₆ are methyl groups.
A method for producing the polycarbonate resin described in the above. 8. A polycarbonate resin for an optical material having the structure according to claim 1 or 2. 9. A polycarbonate resin for an optical disk having the structure according to claim 1.