KR101714834B1 - Polycarbonate resin, method for preparing the same, and article comprising the same - Google Patents

Abstract

The polycarbonate resin of the present invention comprises the repeating unit represented by the formula (1); A repeating unit represented by the formula (2); And a repeating unit represented by the general formula (3), wherein the content of the diaryl carbonate is 10 to 600 ppm. The polycarbonate resin has excellent permeability and gel formation can be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to a polycarbonate resin, a method for producing the same, and a molded article including the polycarbonate resin,

The present invention relates to a polycarbonate resin, a method for producing the same, and a molded article containing the same. More specifically, the present invention relates to a polycarbonate resin which is excellent in transparency and gel formation can be reduced, a method for producing the polycarbonate resin, and a molded article comprising the polycarbonate resin.

The polycarbonate resin is a typical thermoplastic resin having a thermal deformation temperature of 135 ° C or more and is excellent in mechanical properties such as impact resistance and the like and has excellent self-extinguishing property, dimensional stability, heat resistance and transparency, And as an optical material, an optical disk substrate, various lenses, prisms, optical fibers, and the like.

Particularly, in order for the polycarbonate resin to be used as an optical material, the transmittance should be high and the color change due to ultraviolet (UV) light should be small. In addition, the polycarbonate resin produced by the melt polymerization method can form a branch structure due to the fries rearrangement due to the high temperature during the manufacturing process. If such a branched structure is worsened, a gel which is not melted well even at a high temperature can be produced. If a gel is present in a polycarbonate resin, the gel may be contained in a molded product such as an optical material in an unmelted state during molding, which may cause defects and may be of value as a commodity.

Conventionally, a copolymerization technique has been developed for introducing an ultraviolet (UV) stabilizer into a polycarbonate resin or lowering the birefringence. However, the optical characteristics such as the permeability and the appearance characteristics of a molded article due to gel formation still remain, It is difficult to solve the reduction in yield and the like.

Therefore, there is a need to develop a polycarbonate resin which is excellent in transparency and capable of improving the appearance and yield of a molded article by suppressing gel formation.

An object of the present invention is to provide a polycarbonate resin having excellent transparency and reduced gel formation and a method for producing the same.

Another object of the present invention is to provide a molded article comprising the polycarbonate resin.

The above and other objects of the present invention can be achieved by the present invention described below.

One aspect of the invention relates to polycarbonate resins. Wherein the polycarbonate resin comprises a repeating unit represented by the following general formula (1); A repeating unit represented by the following formula (2); And a repeating unit represented by the following formula (3), wherein the content of the diaryl carbonate is 10 to 600 ppm.

[Chemical Formula 1]

(2)

In Formula 2, Q is a substituted or unsubstituted cyclic alkylene group having 5 to 10 carbon atoms, and a and b are each independently an integer of 0 to 4.

(3)

A represents a single bond, a substituted or unsubstituted hydrocarbon group having 1 to 30 carbon atoms, a hydrocarbon group having 1 to 30 carbon atoms containing 0 or S, a halogen acid ester group, a carbonate ester group, CO, S, or SO ₂ , R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, m and n are each independently an integer of 0 to 4, and when they are the same as the repeating unit represented by the formula (1) Are excluded.

In an embodiment, the content of the repeating unit represented by the formula (1) is 1 to 40 mol%, the content of the repeating unit represented by the formula (2) is 1 to 30 mol%, the content of the repeating unit May be from 40 to 98 mol%.

In an embodiment, the repeating unit represented by the formula (3) may be a repeating unit represented by the following formula (3a).

[Chemical Formula 3]

In an embodiment, the polycarbonate resin may have a gel content of 0.02 wt.% Or less according to the following formula 1.

[Formula 1]

Gel content (% by weight) = [W ₁ / W ₀ ] × 100

W ₀ is the weight (10 g) of the specimen prepared by melting 10 g of the polycarbonate resin sample at 260 ° C. for 30 minutes and then cooled to room temperature, and W ₁ is the weight of the specimen obtained by cooling the specimen to a dichloromethane solvent 500 mL, then pouring the solution into a filter paper and filtering the filtered substance into a vacuum oven at 80 ° C and vacuum-drying it under a vacuum of 10 torr or less for 5 hours.

In an embodiment, the polycarbonate resin may have a transmittance of at least 90% of a 2.5 mm thick specimen measured according to ASTM D1003.

Another aspect of the present invention relates to a method for producing the polycarbonate resin. The method comprises reacting a diol mixture comprising a diol represented by the following general formula (4), a diol represented by the following general formula (5) and a diol represented by the following general formula (6) with a diaryl carbonate, and the produced polycarbonate resin And the content of the diaryl carbonate is 10 to 600 ppm.

[Chemical Formula 4]

[Chemical Formula 5]

In Formula 5, Q is a substituted or unsubstituted cyclic alkylene group having 5 to 10 carbon atoms, and a and b are each independently an integer of 0 to 4.

[Chemical Formula 6]

A represents a single bond, a substituted or unsubstituted hydrocarbon group having 1 to 30 carbon atoms, a hydrocarbon group having 1 to 30 carbon atoms containing O or S, a halogen acid ester group, a carbonate ester group, CO, S, or SO ₂ , R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, m and n are each independently an integer of 0 to 4, and when they are the same as the diol represented by the formula (4) Are excluded.

In an embodiment, the content of the diol represented by the general formula (4) is 1 to 40 mol%, the content of the diol represented by the general formula (5) is 1 to 30 mol%, the content of the diol represented by the general formula 98 mole%.

In an embodiment, the molar ratio (M1: M2) of the diol (M1) represented by the formula (4) to the diol (M2) represented by the formula (5) may be 2.5: 1 to 1: 1.

In an embodiment, the molar ratio of the diol mixture and the diaryl carbonate (diol mixture: diaryl carbonate) may be from 0.7: 1 to 1: 1.

In embodiments, the reaction may be carried out at a temperature of from 150 to 330 < 0 > C and a pressure of less than 100 torr.

Another aspect of the present invention relates to a molded article formed from the polycarbonate resin.

In an embodiment, the molded article may be a spectacle lens.

INDUSTRIAL APPLICABILITY The present invention has an effect of providing a polycarbonate resin having excellent transparency and reduced gel formation, a method for producing the polycarbonate resin, and a molded article comprising the polycarbonate resin.

Hereinafter, the present invention will be described in detail.

The polycarbonate resin according to the present invention comprises a repeating unit represented by the following formula (1) in the main chain; A repeating unit represented by the following formula (2); And a repeating unit represented by the following formula (3), wherein the content of the diaryl carbonate is 10 to 600 ppm.

[Chemical Formula 1]

(2)

In Formula 2, Q is a substituted or unsubstituted cyclic alkylene group having 5 to 10 carbon atoms, and a and b are each independently an integer of 0 to 4.

In the specification of the present invention, the term "substituted" means that a hydrogen atom is replaced by a halogen group, an alkyl group having 1 to 10 carbon atoms, a haloalkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, And the like.

(3)

In Formula 3, A represents a single bond, a substituted or unsubstituted C1-C30 (having 1 to 30 carbon atoms) such as a C1-C10 hydrocarbon group, a C1-C30 containing 0 or S (having 1 to 30 carbon atoms) for example a C1-C10 hydrocarbon group, a halogen acid ester, carbonate ester, CO, S, or SO _2, R ₁ and R ₂ are each independently, for a substituted or unsubstituted group having 1 to 6 carbon atoms, for example, carbon atoms M and n are each independently an integer of 0 to 4; Provided that the repeating unit represented by the formula (1) is the same as the repeating unit represented by the formula (1).

In an embodiment, A is a single bond, a substituted or unsubstituted C1-C30 alkylene group, a substituted or unsubstituted C2-C5 alkenylene group, a substituted or unsubstituted C2-C5 alkylidene group, A substituted or unsubstituted C5-C6 cycloalkylene group, a substituted or unsubstituted C5-C10 cycloalkylidene group, a substituted or unsubstituted C6-C30 arylene group , A substituted or unsubstituted C1-C20 alkoxysilyl group, a halogen acid ester group, a carbonic ester group, CO, S, or SO ₂ , each of R ₁ and R ₂ is independently a substituted or unsubstituted C1- Or a substituted or unsubstituted C6-C30 aryl group.

More specifically, the repeating unit represented by the formula (3) may be a repeating unit represented by the following formula (3a), but is not limited thereto.

[Chemical Formula 3]

In the specific example, the content of the repeating unit represented by the formula (1) in the polycarbonate resin may be 1 to 40 mol%, for example, 5 to 30 mol%, and the content of the repeating unit represented by the formula 1 to 30 mol%, for example, 5 to 20 mol%, and the content of the repeating unit represented by the formula 3 may be 40 to 98 mol%, for example, 50 to 90 mol%. A polycarbonate resin having an excellent transparency in the above range and a reduced gel formation even at a high temperature can be obtained.

The polycarbonate resin may be a polycarbonate resin having a diaryl carbonate content of 10 to 600 ppm, for example, 50 to 500 ppm. Within the above range, the transparency of the polycarbonate resin (molded article) can be high and can be applied to optical materials such as spectacle lenses.

In an embodiment, the polycarbonate resin has a weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of 10,000 to 50,000 g / mol, such as 14,000 to 36,000 g / mol, specifically 16,000 to 32,000 g / mol Lt; / RTI > Within the above range, the polycarbonate resin may have mechanical properties suitable for optical materials and the like.

The polycarbonate resin may have a gel content of 0.02% by weight or less, for example, 0.001 to 0.01% by weight, in accordance with Formula 1 below. When molding polycarbonate resin within the above range, a molded article such as an optical material can be produced with high yield.

[Formula 1]

Gel content (% by weight) = [W ₁ / W ₀ ] × 100

In the formula (1), W ₀ represents the weight (10 g) of the specimen prepared by melting 10 g of the polycarbonate resin sample at 260 ° C. for 30 minutes and then cooling the specimen to room temperature, W ₁ represents the weight of the specimen in dichloromethane Dissolved in 500 mL of solvent, poured into filter paper, poured into a vacuum oven at 80 ° C, vacuum dried for 5 hours at a degree of vacuum of 10 torr or less, and then filtered.

The polycarbonate resin is excellent in transmittance of 90% or more, such as 90% to 95%, specifically 90.2% to 92.0%, of a 2.5 mm thick specimen measured according to ASTM D1003, Can be applied.

The polycarbonate resin of the present invention comprises a diol (3,3 ', 5,5'-tetramethyl bisphenol A: TMBPA) represented by the following formula 4, a diol represented by the following formula 5 and a diol represented by the following formula 6 The diol mixture can be prepared by reacting with a diaryl carbonate.

[Chemical Formula 4]

[Chemical Formula 5]

In Formula 5, Q, a and b are as defined in Formula 2 above.

Non-limiting examples of the diol represented by Formula 5 include 1,2-cyclopentanediol, 1,3-cyclopentanediol, 1,2-cyclohexanediol, 1,3-cyclohexanediol, Cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 1,2-cycloheptanediol, 1,3-cycloheptanediol, 1,4- Cycloheptanediol, 1,2-cyclooctanediol, 1,3-cyclooctanediol, and 1,4-cyclooctanediol. Among them, 1,4-cyclohexanedimethanol (CHDM) is preferable.

[Chemical Formula 6]

A represents a single bond, a substituted or unsubstituted hydrocarbon group having 1 to 30 carbon atoms, a hydrocarbon group having 1 to 30 carbon atoms containing O or S, a halogen acid ester group, a carbonate ester group, CO, S, or SO ₂ , R ₁ and R ₂ are each independently a substituted or unsubstituted alkyl group having 1 to 6 carbon atoms, m and n are each independently an integer of 0 to 4, and when they are the same as the diol represented by the formula (4) Are excluded.

Non-limiting examples of the diol represented by Formula 6 include 4,4'-biphenol, 2,2-bis (4-hydroxyphenyl) propane, 2,4-bis (4-hydroxyphenyl) (3-methyl-4-hydroxyphenyl) propane, 2,2-bis (3-chloro-4-hydroxyphenyl) Bis (3,5-dichloro-4-hydroxyphenyl) propane, and the like. Preferred examples thereof include 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane, Hexane and the like can be used, and 2,2-bis- (4-hydroxyphenyl) propane called "bisphenol A" is more preferably used.

In an embodiment, the content of the diol represented by the general formula (4) may be 1 to 40 mol%, for example, 5 to 30 mol%, and the content of the diol represented by the general formula (5) Mol%, for example, 5 to 20 mol%, and the content of the diol represented by the formula (6) may be 40 to 98 mol%, for example, 50 to 90 mol%. A polycarbonate resin having an excellent transparency in the above range and a reduced gel formation even at a high temperature can be obtained.

In an embodiment, the molar ratio (M1: M2) of the diol (M1) represented by the formula (4) to the diol (M2) represented by the formula (5) may be 2.5: 1 to 1: 1, 1.1: 1.0. In the above range, the balance of physical properties of the transmittance and the gel formation reduction characteristics may be more excellent.

Examples of the diaryl carbonate used in the present invention include diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, diethyl carbonate, dimethyl carbonate, Dibutyl carbonate, dicyclohexyl carbonate, and the like, but are not limited thereto. These may be used alone or in combination of two or more, for example, diphenyl carbonate may be used.

The molar ratio of the diol mixture to the diaryl carbonate (diol mixture: diaryl carbonate) may be from 0.7: 1 to 1: 1, such as from 0.7: 1 to 0.9: 1. A polycarbonate resin having excellent mechanical strength in the above range can be obtained.

In an embodiment, the reaction of the diol mixture and the diaryl carbonate (transesterification reaction) may be by melt polymerization and may be carried out at a temperature of from 150 to 300 캜, such as from 160 to 280 캜, specifically from 190 to 260 캜 For at least 10 minutes, for example 15 minutes to 24 hours, more specifically 15 minutes to 12 hours, under reduced pressure conditions of 100 torr or less, for example 75 torr or less, specifically 30 torr or less, more specifically 1 torr or less Can be performed. It is preferable that the reaction proceeds in the above range in order to reduce the reaction rate and the side reaction, and the gel formation can be reduced.

The reaction may be carried out in the presence of a catalyst. As the catalyst, a catalyst used in a common ester exchange reaction may be used. For example, an alkali metal catalyst, an alkaline earth metal catalyst, or the like may be used. Examples of the alkali metal catalyst include, but are not limited to, LiOH, NaOH, and KOH. These may be used alone or in combination of two or more. The content of the catalyst may be in the range of 1 x 10 ^-8 to 1 x 10 ^-3 moles, for example, 1 x 10 ^-7 to 1 x 10 ^-4 moles per mole of the diol mixture. It is possible to obtain sufficient reactivity in the above range, minimize the production of by-products due to side reactions, and improve the thermal stability and color stability.

The polycarbonate resin of the present invention may further contain a sulfonic acid ester compound represented by the following general formula (7), if necessary. That is, the residual activity of the catalyst can be removed by injecting a sulfonic acid ester compound represented by the following formula (7) into the polycarbonate resin produced according to the above production method.

(7)

Wherein R ₃ is a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, R ₄ is a substituted or unsubstituted alkylene group having 11 to 20 carbon atoms, and c is an integer of 0 to 5.

Examples of the sulfonic acid ester compound represented by the formula (7) include dodecyl p-toluenesulfonic acid ester, octadecyl p-toluenesulfonic acid ester, dodecyl (dodecylbenzene) sulfonic acid ester and octadecyl (dodecylbenzene) can do.

When the sulfonic acid ester compound is used, the amount thereof may be 0.0001 to 0.001 part by weight, for example, 0.0003 to 0.0008 part by weight based on 100 parts by weight of the polycarbonate resin. In the above range, the thermal stability and hydrolysis resistance can be excellent.

As a method for incorporating the sulfonic acid ester compound into the polycarbonate resin, in one embodiment, the sulfonic ester compound may be directly introduced into a reactor containing a polycarbonate resin having undergone the reaction to prepare the reaction product in situ. In another embodiment, the polycarbonate resin produced by the transesterification reaction and the sulfonic acid ester compound can be mixed in the extrusion step. After the reaction, the resulting polycarbonate resin is transferred to an extruder, and the sulfonic acid ester compound is introduced into an extruder and extruded to form a pellet.

In addition to the sulfonic acid ester compound, the polycarbonate resin of the present invention can be extruded by further adding ordinary additives, if necessary. Examples of the additive include flame retardants such as tris (2,4-di-tert-butylphenyl) phosphate, antioxidants such as octadecyl 3- (3,5-di-tert-4-hydroxyphenyl) propionate, But are not limited to, release agents, heat stabilizers, light stabilizers, compatibilizers, dyes, inorganic additives, fillers, plasticizers, impact modifiers, admixtures, lubricants, antistatic agents, pigments, lubricants and sunscreens. These may be used alone or in combination of two or more.

The polycarbonate resin according to the present invention has excellent optical properties such as transmittance and gel formation can be reduced even at a high temperature, so that it can be applied to various molded articles. It can be used, for example, as an optical material such as a spectacle lens, an optical film, an optical disk substrate, a prism, an optical fiber such as an optical fiber, an electric / electronic exterior material, an office equipment, Do. For example, extrusion molding, injection molding, vacuum molding, casting molding, blow molding, calender molding and the like can be applied. These are well known to those of ordinary skill in the art to which the present invention pertains.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example

Examples 1-5 and Comparative Examples 1-3

(TMBPA), 1,4-cyclohexanedimethanol (CHDM) and 2,2-bis (4-hydroxyphenyl) propane were synthesized according to the composition shown in Table 1 below. 102.8 parts by mol of diphenyl carbonate and 150 parts by ppg of KOH (relative to 1 mol of diphenyl carbonate) were sequentially added to the reactor in 100 parts by mol of the diol mixture of propane (BPA), and then nitrogen was used to remove oxygen in the reactor. The temperature of the reactor was raised to 160 캜, and the temperature was raised again to 190 캜 and reacted for 6 hours. After 6 hours, the temperature of the reactor was raised to 210 캜 and maintained at a pressure of 100 torr for 1 hour. Next, the temperature of the reactor was raised to 260 DEG C, held at a pressure of 20 torr for 1 hour, lowered to 0.5 torr, and maintained for 1 hour to prepare a molten polycarbonate resin. Next, the polycarbonate resin thus prepared was extruded at a temperature of 270 DEG C in a twin-screw extruder having L / D = 36 and? = 32, and a pellet-shaped polycarbonate resin was prepared using the pelletizer.

Example Comparative Example One 2 3 4 5 One 2 3 TMBPA content (mol%) 5 10 10 20 30 - - 30 CHDM content (mol%) 5 5 10 10 20 - 20 - BPA content (mol%) 90 85 80 70 50 100 80 70

Property evaluation method

The polycarbonate resin in the form of pellets prepared in Examples 1 to 5 and Comparative Examples 1 to 3 was molded at a molding temperature of 270 to 290 DEG C and a mold temperature of 70 DEG C using an extruder (equipment name: DHC 120WD, manufactured by Dongshin Hydraulic Co., And the specimens suitable for the evaluation method were obtained. The physical properties of the pellets and the specimen were measured by the following method, and the results are shown in Table 3 below.

(1) Permeability (unit:%): Permeability (%) was measured using a Haze meter NDH 2000 instrument of Nippon Denshoku according to ASTM D1003 evaluation method using a 2.5 mm thick specimen. The transmittance (total light transmittance (total transmittance (TT)),%) was calculated from the total light amount of the diffused transmitted light DF and parallel transmitted light PT.

(2) Gel content (unit: wt%): The gel content of the polycarbonate resin was measured according to the following formula (1).

[Formula 1]

Gel content (%) = [W ₁ / W ₀ ] × 100

In the formula (1), W ₀ represents the weight (10 g) of the specimen prepared by melting 10 g of the polycarbonate resin sample at 260 ° C. for 30 minutes and then cooling the specimen to room temperature, W ₁ represents the weight of the specimen in dichloromethane It is the weight of the filtered substance (gel) after dissolving in 500 mL of solvent, pouring the solution into the filter paper, filtering the substance in a vacuum oven at 80 캜, and vacuum drying for 5 hours under a vacuum of 10 torr or less.

(3) Evaluation of silver streak: The pellets were injection-molded at a molding temperature of 290 ° C to prepare 5 pieces of 10 cm × 10 cm × 3 mm specimens, and silver streaks on the surface of the specimens were measured And scored by size according to the criteria shown in Table 2 below, and the scores of the silver streaks of the respective specimens were summed and then averaged. The silver streak evaluation indicates the appearance quality of the article or film, and the higher the silver streak score, the lower the appearance quality.

Size of silver streak (cm) 0 0.5 to 1.0 1.1 to 1.5 1.6 to 2.0 2.1 to 3.0 3.1 or higher score 0 One 2 3 4 5

4, the spectacle lens yield (%): mold clamping force 150 tons and injection pressure of 1700 kgf / cm ^2, the molding 100 is injected glasses lens at a molding temperature of 300 ℃ the spectacle lens mold at a screw diameter 35mm Injection of formula 2, the yield of the spectacle lens was measured.

[Formula 2]

Spectacle lens yield (%) = (100 - (defective number)) / 100 100

In the formula (2), the defective number is the number of spectacle lenses in which the irradiated spectacle lens is visually inspected under fluorescent light and the foreign object and / or the non-molten material are in the lens.

Example Comparative Example One 2 3 4 5 One 2 3 Permeability (%) 90.2 90.2 90.6 90.5 91.3 89.9 91.0 89.7 Gel content (% by weight) 0.003 0.002 0.002 0.001 0.001 0.05 0.08 0.002 Silver Strick Rating (Score) 2 One One 0 0 40 38 0 Glasses lens yield (%) 89 91 92 94 95 82 80 93

From the results shown in Table 3, the polycarbonate resin of the present invention (Example 1-5) is excellent in transparency and gel formation is reduced, and the appearance quality (silver streak evaluation) and yield It can be excellent.

On the other hand, the resins of Comparative Examples 1 to 3 exhibit reduced permeability and deterioration in appearance quality and yield as a result of the gel generation as compared with the examples.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

A repeating unit represented by the following formula (1);
A repeating unit represented by the following formula (2); And
And a repeating unit represented by the following formula (3a)
Wherein the content of the diaryl carbonate is 10 to 600 ppm.
[Chemical Formula 1]

(2)

In Formula 2, Q is a cyclic alkylene group having 5 to 10 carbon atoms, a and b are each independently an integer of 0 to 4;
[Chemical Formula 3]

.
[2] The method according to claim 1, wherein the content of the repeating unit represented by the formula (1) is 1 to 40 mol%, the content of the repeating unit represented by the formula (2) is 1 to 30 mol% Of the polycarbonate resin is 40 to 98 mol%.
delete The polycarbonate resin according to claim 1, wherein the polycarbonate resin has a gel content of 0.02 wt% or less according to the following formula 1:
[Formula 1]
Gel content (% by weight) = [W ₁ / W ₀ ] × 100
In the formula (1), W ₀ represents the weight (10 g) of the specimen prepared by melting 10 g of the polycarbonate resin sample at 260 ° C. for 30 minutes and then cooling the specimen to room temperature, W ₁ represents the weight of the specimen in dichloromethane It is the weight of the filtered substance (gel) after dissolving in 500 mL of solvent, pouring the solution into the filter paper, filtering the substance in a vacuum oven at 80 캜, and vacuum drying for 5 hours under a vacuum of 10 torr or less.
The polycarbonate resin according to claim 1, wherein the polycarbonate resin has a transmittance of 90% or more of a 2.5 mm thick specimen measured according to ASTM D1003.
Reacting a diol mixture comprising a diol represented by the following formula (4), a diol represented by the following formula (5) and 2,2-bis (4-hydroxyphenyl) propane with a diaryl carbonate,
Wherein the content of the diaryl carbonate in the produced polycarbonate resin is 10 to 600 ppm.
[Chemical Formula 4]

[Chemical Formula 5]

In Formula 5, Q is a cyclic alkylene group having 5 to 10 carbon atoms, and a and b are each independently an integer of 0 to 4.
[Claim 6] The method according to claim 6, wherein the content of the diol represented by Formula 4 is 1 to 40 mol%, the content of the diol represented by Formula 5 is 1 to 30 mol% Propylene) is from 40 to 98 mol%. The method for producing a polycarbonate resin according to claim 1,
The polycarbonate resin composition according to claim 6, wherein the molar ratio (M1: M2) of the diol (M1) represented by Formula 4 to the diol (M2) represented by Formula 5 is 2.5: 1 to 1: ≪ / RTI >
7. The method of claim 6, wherein the molar ratio of the diol mixture to the diaryl carbonate (diol mixture: diaryl carbonate) is from 0.7: 1 to 1: 1.
7. The method of claim 6, wherein the reaction is carried out at a temperature of 150 to 330 DEG C and a pressure of 100 torr or less.
A molded article formed from the polycarbonate resin according to any one of claims 1, 2, and 4 to 5.
The molded article according to claim 11, wherein the molded article is a spectacle lens.