JPH0620783B2 - Method for manufacturing optical disk substrate made of polycarbonate resin - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a polycarbonate resin optical disk substrate, and more specifically, it has excellent heat resistance and optical characteristics, particularly good transparency and small optical distortion. The present invention relates to a method for manufacturing a polycarbonate optical disk substrate.

[Conventional technology]

The resin molded product used for optical recording / reproduction needs to be transparent and have a small optical distortion. Especially in optical discs that are optical information recording materials using digital signals, such as digital audio discs, digital video discs, and optical discs for reading and writing information, the requirement for transparency is extremely strict. The actual strain is required to be 5 × 10 ⁻⁵ or less in terms of birefringence in an actual molded product.

Usually, injection molding method is adopted as a simple method for molding such a shape, but as a method for reducing optical distortion, the molten resin temperature is raised or the molecular weight of the resin is increased. A method of lowering the melt flowability is adopted.

Further, in the case of a disk which is continuously used for a long period of time, it is necessary to withstand a harsh usage environment, so that the heat resistance is strict.

By the way, a polycarbonate resin composed of a carbonate bond constitutional unit having at least one aromatic group suspended as a unit constituting a carbonate bond is a polycarbonate derived from 2,2-bis (4-hydroxyphenyl) propane [bisphenol A]. It is superior in flame resistance to resins (so-called polycarbonate resins that are commercially available), and its application to optical disk substrates is under study.
However, this type of polycarbonate resin has various problems because it has a poor fluidity as compared with a polycarbonate resin made from a usual bisphenol A.

[Problems to be solved by the invention]

For example, when an attempt is made to increase the fluidity of the molten resin by increasing the temperature of the molten resin for the purpose of reducing the optical distortion of the obtained disk, various troubles such as deterioration of the resin due to high temperature will occur. Further, if the molecular weight of the resin is lowered to increase the fluidity, the strength of the molded product is lowered and a satisfactory optical disc substrate cannot be obtained.

[Means for solving problems]

In view of the above points, the present inventors have excellent transparency and small optical distortion without impairing the excellent heat resistance of the polycarbonate resin composed of the carbonate bond constitutional unit having at least one pendant aromatic group. As a result of intensive studies on a method for obtaining an optical disk substrate, a polycarbonate resin having a specified carbonate bond constitutional unit and a molecular weight was injection-molded under specific molding conditions to obtain a light-resistant resin having excellent heat resistance and optical characteristics. The present invention has been accomplished by finding that a disk substrate can be manufactured.

[Structure of Invention]

In the present invention, among the units constituting the carbonate bond, the carbonate bond structural unit (A component) having at least one pendant aromatic group is 95 to 5% by weight with respect to all the carbonate bond structural units and the following general formula ( I) (In the formula, X, Y, Z, and W are hydrogen atoms or 1 to 6 carbon atoms.
Is an aliphatic hydrocarbon group. ) A carbonate resin having a group represented by the formula (B component) is contained in an amount of 5 to 95% by weight with respect to all the carbonate bond structural units, and the average molecular weight of the polycarbonate resin is 9,500 to 22,000. This is a method for producing a polycarbonate resin optical disk substrate which is injection molded at 400 ° C. and a mold temperature of 50 to 150 ° C.

Hereinafter, the present invention will be described in detail.

The carbonate bond in the present invention is obtained by reacting an alcoholic hydroxyl group or a phenolic hydroxyl group with, for example, phosgene. The term "carbonate bond constitutional unit" refers to a divalent group interposed between such carbonate bonds. Further, it does not matter if the carbonate bond constituent unit contains other bond species such as ester bond, amide bond, carbamate bond, ether bond and the like.

Examples of the carbonate bond structural unit having at least one pendant aromatic group include those represented by the following general formula (II).

General formula (II) However, in the formula (II), X ′ and Y ′ are hydrogen atoms and have 1 carbon atom.
~ 6 aliphatic hydrocarbon group, an aryl group or an aralkyl group, and at least one of X'and Y'is an aryl group or an aralkyl group, and Z'and W'are a hydrogen atom or a carbon number of 1 to 6 is an aliphatic hydrocarbon group.

Polycarbonates containing carbonate-bonded building blocks having at least one such pendant aromatic group can provide pendant aromatic groups. For example, the following general formula (II ′)
It can be obtained by reacting one or more of the bisphenol-based compounds represented by with phosgene and polymerizing.

General formula (II ′) However, in the formula (II ′), X ′, Y ′, Z ′ and W ′ have the same meaning as in the general formula (II).

Examples of the bisphenol compound represented by the general formula (II ′) include bis (4-hydroxyphenyl) phenylmethane, 1,1-bis (4-hydroxyphenyl) -1-phenylethane, 1, 1-bis (4-hydroxyphenyl) -1-phenylpropane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) dibenzylmethane and the like can be mentioned.

The polycarbonate containing the carbonate-bonded structural unit having a group represented by the general formula (I) can provide the group represented by the general formula (I). For example, it can be obtained by reacting one or more bisphenol compounds represented by the following general formula (I ') with phosgene and polymerizing them.

General formula (I ′) However, in the formula (I ′), X, Y, Z, and W are those of the general formula (I)
Is synonymous with.

Examples of the bisphenol compound represented by the general formula (I ′) include 2,2-bis (4-hydroxy-3-).
Methylphenyl) propane, 2,2-bis (4-hydroxy-3-ethylphenyl) propane, 2,2-bis (4-hydroxy-3-isopropylphenyl) propane, 2,2-bis (4-hydroxy-3-) sec butylphenyl) propane, 2,2-bis (4-hydroxy-3)
-Tert butylphenyl) propane, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 1,1-bis (4-hydroxyphenyl) propane, 2,2-bis ( 4-hydroxyphenyl) propane or bisphenol A, 2,2-bis (4
-Hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) -3-methylbutane, 2,2-bis (4-hydroxyphenyl) Hexane, 2,2-bis (4-hydroxyphenyl) -4-methylpentane and the like can be mentioned.

In the present invention, first, a carbonate bond structural unit having at least one pendant aromatic group (hereinafter referred to as component A) and a carbonate bond structural unit having a group represented by the general formula (I) (hereinafter referred to as component B). A polycarbonate resin having is prepared. As the method, when a polycarbonate is produced using a bisphenol compound having at least one pendant aromatic group, for example, a bisphenol compound represented by the general formula (II ′), the above general formula (I ′ A method of copolymerizing the bisphenol compound represented by the formula (4) within a range satisfying the requirements of the present invention. Further, the bisphenol compound represented by the general formula (II ′) and the bisphenol compound represented by the general formula (I ′) are respectively reacted with phosgene to obtain respective polycarbonates, and these polycarbonates are then used in the invention. They may be mixed to meet the requirements.

To produce a polycarbonate resin containing the components A and B, the bisphenol compounds of the general formulas (I ') and (II') and an aqueous alkaline solution or pyridine are prepared in an inert solvent such as methylene chloride or 1,2-dichloromethane. An acid acceptor such as the above may be added, and phosgene may be introduced into this to react. When an alkaline aqueous solution is used as the acid acceptor, the reaction rate increases when a tertiary amine such as trimethylamine or triethylamine or a quaternary ammonium compound such as tetrabutylammonium chloride or benzyltributylammonium bromide is used as a catalyst. If necessary, a monovalent phenol such as phenol or p-tert-butylphenol is allowed to coexist as a molecular weight regulator.

The reaction temperature is 0 to 100 ° C. The catalyst may be added from the beginning, or it may be used in any method such as by adding it in the middle of the reaction, that is, after the oligomer is formed and carrying out the polymerizing reaction in the presence of the catalyst.

The copolymerization of the bisphenol compounds represented by the general formulas (I ′) and (II ′) is carried out as follows: (a) From the beginning, both are present in the reaction system and simultaneously reacted with phosgene to polymerize, (b) one is First, after reacting with phosgene to some extent and then adding the other, polymerization is carried out, (c) Separately reacting with phosgene to form an oligomer, and then mixing them and further reacting to polymerize, etc. Can be taken.

As a method of mixing separately polymerized,
After mixing each powder or granules, extruder,
Any method such as a method of mixing in a molten state with a kneader or a kneading roll, a solution blending method, or the like can be used.

A component and B of the polycarbonate resin used in the present invention
From the viewpoint of molding processability and heat resistance, the content of the component is A
The component is 95 to 5% by weight, and the B component is 5 to 95% by weight. If the content of the component A exceeds 95% by weight, the moldability will be poor, and if the content of the component A is less than 5% by weight, the heat resistance will decrease. Of these, 90 to 25% by weight of the component A is a more preferable range.

The average molecular weight of the polycarbonate resin used in the present invention is 9,500 to 22,000.

The average molecular weight as referred to herein is a value obtained from ηsp measured at 20 ° C. using a solution of 6.0 g of polymer in methylene chloride by the following formulas (1) and (2).

ηsp / c = [η] (1 + K ′ ηsp) …… (1) [η] ＝ KM ^α …………………… (2) C polymer concentration in the formula g / [η] intrinsic viscosity, K ′ = 0.28 K 1.23 × 10 ⁻⁵ , α = 0.83 M Average molecular weight If the average molecular weight is less than 9,500, the mechanical properties will not be sufficient, and if it exceeds 22,000, optical distortion will occur. It is difficult to obtain a small optical disk substrate. Among them, the preferable average molecular weight is 10,000 to 20,000.

Furthermore, when the optical disc substrate is manufactured by injection molding the above polycarbonate resin, the resin temperature is set to 300 to 400.
℃.

If the resin temperature is too high, decomposition of the resin is unavoidable, which causes coloration and silver streaks, which is not preferable. On the other hand, if the resin temperature is too low, it becomes impossible to obtain a molded product having a small optical strain even if the above-mentioned polycarbonate resin, which hardly causes optical strain, is used.

The mold temperature is 50 to 150 ° C., preferably 60 to 1
45 ° C. If the mold temperature is too high, the deformation at the time of mold release becomes large, and it becomes impossible to obtain a molded product with small warpage. On the contrary, if it is too low, it becomes impossible to obtain a molded product having a small optical distortion.

In addition, in injection molding, it is preferable to add 0.01 to 2% by weight of a phosphite ester to a polycarbonate resin in order to suppress coloring and deterioration of transparency due to decomposition of the resin.

Examples of such phosphite include tributyl phosphite, tris (2-ethylhexyl) phosphite, tridecyl phosphite, tristearyl phosphite,
Examples thereof include triphenyl phosphite, tricresyl phosphite, 2-ethylhexyl diphenyl phosphite, decyl diphenyl phosphite, tricyclohexyl phosphite, distearyl pentaerythrityl diphosphite and the like. As a method for containing such a phosphite ester, a method of dry blending, a method of melt mixing when pelletizing with an extruder, or a master pellet having a high concentration of phosphite ester at that time is prepared and dry pellets are added. The method of blending can be mentioned.

〔Example〕

Hereinafter, a specific method for producing the polycarbonate resin used in the present invention will be described as a production example, and a method for producing an optical disc substrate using the obtained polycarbonate resin will be illustrated as an example. In the following, all parts showing the amounts of the respective components are parts by weight. Further, the glass transition temperature is obtained from a differential scanning calorimeter manufactured by Perkin Elmer Co., Ltd., and the flow value is JIS K6719.
It is the value obtained according to.

The compositions and average molecular weights of the polycarbonate resins produced in Production Examples 1 to 4 and Comparative Production Examples 1 to 5 are shown in Table 1 below. The measurement results of various physical properties of these polycarbonate resins are shown in Table 2 below.

Production Example 1 (a) Production of Polycarbonate Oligomer 1,1-bis (4-hydroxyphenyl) -1-phenylethane 100 parts Sodium hydroxide 40 parts Water 600 parts Methylene chloride 375 parts The above mixture is charged into a reactor equipped with a stirrer. It was stirred at 800 rpm. 57 parts of phosgene was blown into this for 1 hour to carry out interfacial polymerization. After completion of the reaction, only the methylene chloride solution containing the polycarbonate oligomer was collected. The analysis results of the methylene chloride solution of the obtained oligomer are as follows.

Oligomer concentration 22.5% by weight (Note 1) Terminal chloroformate group concentration 0.42 standard (Note 2) Terminal phenolic hydroxyl group concentration 0.020 standard (Note 3) Note 1) Measured by evaporation to dryness.

2) Neutralization titration of aniline hydrochloride obtained by reacting with aniline with 0.2N aqueous sodium hydroxide solution.

3) Colorimetric determination of color development at 546 nm when dissolved in titanium tetrachloride and acetic acid solution.

The oligomer solution obtained by the above method is hereinafter abbreviated as oligomer solution-A.

(B) Production of Polycarbonate Oligomer 16.6% aqueous solution of bisphenol A sodium salt prepared by dissolving bisphenol A in sodium hydroxide aqueous solution 100 parts P-tertiary butylphenol 0.23 part methylene chloride 40 parts phosgene 7 parts A mixture having the above composition was quantitatively supplied to a pipe reactor to carry out interfacial polymerization.

The reaction mixture was separated, and only the methylene chloride solution containing the polycarbonate oligomer was collected.

The analysis results of the methylene chloride solution of the obtained oligomer are as follows.

Oligomer concentration 24.5% by weight Terminal chloroformate group concentration 1.3 N Terminal phenolic hydroxyl group concentration 0.3 N The oligomer solution obtained by the above method is abbreviated as oligomer solution-B below.

(C) Production of Polycarbonate Resin Oligomer solution-A 156 parts Oligomer solution-B 100 parts Methylene chloride 86 parts P-tert-Carry-butylphenol 1.65 parts were charged into a reactor equipped with a stirrer and stirred at 550 rpm.

Further, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 2 hours.

Water 40 parts Sodium hydroxide 25% by weight aqueous solution 50 parts Triethylamine 2% by weight aqueous solution 1.1 parts Subsequently, the reaction mixture was separated and the methylene chloride solution containing the polycarbonate resin was washed with water, hydrochloric acid aqueous solution and water. Finally, the methylene chloride was evaporated to take out the resin. The average molecular weight of this resin was 13,500.

In addition, the amount of carbonate-bonded structural units derived from bisphenol A which were copolymerized was 39.5% by weight based on the whole NMR-bonded structural units based on the results of NMR analysis.

Production Example 2 Production of Polycarbonate Oligomer solution-A 208 parts Oligomer solution-B 54 parts Methylene chloride 87 parts P-tert-Carry-butylphenol 2.05 parts were charged into a reactor equipped with a stirrer and stirred at 550 rpm. Further, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 2 hours.

Water 48 parts Sodium hydroxide 25% by weight aqueous solution 39 parts Triethylamine 2% by weight aqueous solution 1.1 parts After washing by the same formulation as in Production Example 1, the average molecular weight of the resin taken out was 13,100.

The amount of the bisphenol A-derived carbonate bond structural units copolymerized was 20.5% by weight based on the total carbonate bond structural units based on the NMR analysis results.

Production Example 3 (a) Production of Polycarbonate Oligomer 2,2-Bis (4-hydroxy-3-methylphenyl) propane 100 parts Sodium hydroxide 50 parts Water 870 parts Methylene chloride 530 parts P-tert-butyl-phenylphenol 2. 0 part The above mixture was charged into a reactor equipped with a stirrer and stirred at 800 rpm. 70 parts of phosgene was blown into this for 2 hours for interfacial polymerization. After completion of the reaction, only the methylene chloride solution containing the polycarbonate oligomer was collected. The analysis results of the methylene chloride solution of the obtained oligomer are as follows.

Oligomer concentration 24.0% by weight Terminal chloroformate group concentration 0.56N Terminal phenolic hydroxyl group concentration 0.13N The oligomer solution obtained by the above method is abbreviated as "oligomer solution-C".

(B) Manufacture of Polycarbonate Oligomer solution-A 214 parts Oligomer solution-C 50 parts Methylene chloride 92 parts P-tert-Carry-butylphenol 1.18 parts Agitated in a reactor equipped with a stirrer at 550 rpm. Furthermore, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 3 hours.

Water 56 parts Sodium hydroxide 25% by weight aqueous solution 30 parts Triethylamine 2% by weight aqueous solution 1.11 parts The average molecular weight of the resin taken out after washing by the same formulation as in Production Example 1 was 13,900.

Further, the amount of the carbonate bond constitutional unit derived from 2,2-bis (4-hydroxy-3-methylphenyl) propane copolymerized from the analysis result of NMR was 19.1% by weight based on all the carbonate bond constitutional units. .

Production Example 4 (a) Production of polycarbonate oligomer 2,2-bis (4-hydroxy-3-sec butylphenyl) propane 100 parts Sodium hydroxide 35 parts Water 700 parts Methylene chloride 385 parts The above mixture was charged into a reactor equipped with a stirrer. It was stirred at 800 rpm. 43 parts of phosgene was blown into this for 1 hour to carry out interfacial polymerization. After the reaction was completed, only the methylene chloride solution containing the polycarbonate oligomer was collected. The analysis results of the methylene chloride solution of the obtained oligomer are as follows.

Oligomer concentration 23.5% by weight Terminal chloroformate group concentration 0.40 N terminal phenolic hydroxyl group concentration 0.050 N The oligomer solution obtained by the above method is hereinafter abbreviated as oligomer solution-D.

(B) Production of Polycarbonate Oligomer Bis- (4-hydroxyphenyl) diphenylmethane 100 parts Sodium hydroxide 50 parts Water 700 parts Methylene chloride 350 parts The above mixture was charged into a reactor equipped with a stirrer and stirred at 800 rpm. 40 parts of phosgene was blown into this for 1 hour to carry out interfacial polymerization. After completion of the reaction, only the methylene chloride solution containing the polycarbonate oligomer was collected. The analysis results of the methylene chloride solution of the obtained oligomer are as follows.

Oligomer concentration 24.2% by weight Terminal chloroformate group concentration 0.38N Terminal phenolic hydroxyl group concentration 0.072N Oligomer solution obtained by the above method is hereinafter abbreviated as oligomer solution-E.

(C) Production of Polycarbonate Oligomer solution-D 160 parts Oligomer solution-E 100 parts Methylene chloride 110 parts P-Ta-Carry-butylphenol 1.36 parts were charged into a reactor equipped with a stirrer and stirred at 550 rpm. Further, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 5 hours.

Water 64 parts Sodium hydroxide 25% by weight aqueous solution 27 parts Triethylamine 2% by weight aqueous solution 1.1 parts After washing by the same formulation as in Production Example 1, the average molecular weight of the resin taken out was 13,700.

Further, the amount of the carbonate bond constitutional unit derived from 2,2-bis (4-hydroxy-3-sec butylphenyl) propane copolymerized from the result of NMR analysis is 61.8% by weight based on the total carbonate bond constitutional unit. It was

Comparative Production Example 1 Production of Polycarbonate Oligomer Solution-A 140 parts P-Ta-Carry-Butylphenol 0.7 parts Methylene chloride 80 parts The above mixture was charged into a reactor equipped with a stirrer and stirred at 550 rpm. Further, an aqueous solution having the following composition, that is, 7.3% by weight aqueous solution of sodium hydroxide 80 parts, 1 part of 2% by weight triethylamine aqueous solution, was added and interfacial polymerization was carried out for 3 hours to separate the reaction mixture, and a methylene chloride solution containing a polycarbonate resin was added to water. The mixture was washed with an aqueous solution of hydrochloric acid and then with water, and finally methylene chloride was evaporated to take out the resin. The average molecular weight of this resin was 14,100.

Comparative Production Example 2 Production of Polycarbonate Oligomer Solution-E 260 parts P-Ta-Carry-Butylphenol 1.9 parts Methylene chloride 120 parts were charged into a reactor equipped with a stirrer and stirred at 550 rpm. Further, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 2 hours.

Water 70 parts Sodium hydroxide 25% by weight aqueous solution 25 parts Triethylamine 2% by weight aqueous solution 0.9 part After washing by the same formulation as in Production Example 1, the average molecular weight of the resin taken out was 12,800.

Comparative Production Example 3 Production of Polycarbonate A polycarbonate was produced in the same manner as in (c) of Production Example 1 except that 1.65 parts of P-tert-butylphenol was set to 0 part. The average molecular weight of this resin is 2
It was 2,500.

Further, the amount of the bisphenol A-derived carbonate bond composition unit copolymerized was 39.6% by weight based on all the carbonate bond composition units, based on the analysis result of NMR.

Comparative Production Example 4 Production of Polycarbonate A polycarbonate was produced in the same manner as in (c) of Production Example 1 except that 1.65 parts of P-tert-butylphenol was changed to 2.38 parts. The average molecular weight of this resin was 8,700.

In addition, the amount of carbonate-bonded structural units derived from bisphenol A which were copolymerized was 39.5% by weight based on the whole NMR-bonded structural units based on the results of NMR analysis.

Comparative Production Example 5 Production of Polycarbonate Oligomer Solution-B 160 parts P-Ta-Carry-Butylphenol 1.3 parts Methylene chloride 130 parts The above mixture was charged into a reactor equipped with a stirrer and stirred at 550 rpm. Further, an aqueous solution having the following composition was charged and interfacial polymerization was carried out for 1.5 hours.

16.6% by weight aqueous solution of bisphenol A-sodium salt 80 parts 25% by weight aqueous solution of sodium hydroxide 8 parts 2% by weight aqueous solution of triethylamine 1 part After washing with the same formulation as in Preparation Example 1, the average molecular weight of the resin taken out is It was 15,000.

Examples 1 to 5 and Comparative Examples 1 to 8 After adding 130 ppm of 2-ethylhexyl diphenyl phosphite to the polycarbonate resins produced in Production Examples 1 to 4 and Comparative Production Examples 1 to 4, 2 were produced using a 40 mmφ extruder.
The mixture was melt-kneaded at 80 ° C. and extruded into pellets.

Using an injection molding machine (M-140A manufactured by Meiki Co., Ltd.), the pellet was manufactured into a disk-shaped optical disk substrate having a thickness of 1.2 mm and a diameter of 130 mm under the molding conditions shown in Table-3.

Phase difference due to birefringence at 3.0 cm and 5.5 cm from the center of the obtained substrate (abbreviated as Δn _3.0 and Δn _5.5 , respectively)
Was measured using a polarizing microscope manufactured by Nippon Kogaku Co., Ltd.

In addition, the amount of warp was measured by NiDEK's Flatton Tester FT-
7 was used for measurement.

The results are shown in Table-3.

[Effects of the Invention] According to the method of the present invention, molding can be performed under mild conditions using a polycarbonate resin having excellent heat resistance and fluidity. Further, it is possible to obtain an optical disk substrate having excellent heat resistance, good transparency, small birefringence and warpage, and sufficient strength.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masahiro Nukii, 1000, Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Sanryoh Chemical Industry Co., Ltd. Research Institute (72) Isao Ikuhara 1000, Kamoshida-cho, Midori-ku, Yokohama-shi, Kanagawa Address Sanryo Kasei Kogyo Co., Ltd.

Claims (4)

[Claims] 1. Among the units constituting a carbonate bond,
95 to 5% by weight of a carbonate-bonding structural unit (component A) having at least one pendant aromatic group based on all carbonate-bonding structural units and the following general formula (I) (In the formula, X, Y, Z, and W are hydrogen atoms or 1 to 6 carbon atoms.
Is an aliphatic hydrocarbon group. ) A carbonate resin having a group represented by the formula (B component) is contained in an amount of 5 to 95% by weight based on the total amount of the carbonate bond structural units, and an average molecular weight of 9,500 to 22,000 is obtained at a resin temperature of 300. ~ 400 ℃,
A method for producing an optical disk substrate made of a polycarbonate resin, which comprises performing injection molding at a mold temperature of 50 to 150 ° C. 2. A polycarbonate resin comprising a carbonate bond structural unit (component A) having at least one pendant aromatic group as a carbonate bond structural unit, and a carbonate bond structural unit having a group represented by the general formula (I). The method according to claim 1, which is a copolycarbonate having (Component B). 3. A polycarbonate resin comprising a carbonate-bonding structural unit (component A) having at least one pendant aromatic group and the above-mentioned general formula (I).
A carbonate-bonding structural unit (B having a group represented by
Process according to claim 1, which is a mixture with a polycarbonate consisting of components). 4. The component A is represented by the following general formula (II): (Wherein X ′ and Y ′ are selected from a hydrogen atom, an aliphatic hydrocarbon group having 1 to 6 carbon atoms, an aryl group or an aralkyl group, and at least one of X ′ and Y ′ is an aryl group or an aralkyl group. And Z'and W'are a hydrogen atom or an aliphatic hydrocarbon group having 1 to 6 carbon atoms.) A carbonate-bonding structural unit having a group represented by any one of claims 1 to 3. The method according to item 1.