TWI389786B - A method for manufacturing a raw material for a disc, and a raw material for a disc manufactured by the method - Google Patents

Description

Manufacturing method of raw material for optical disc, raw material for optical disc manufactured by the method

The present invention relates to the manufacture of raw materials for optical discs, the raw materials for optical discs and optical discs obtained by the method, and more specifically to the use of optical discs made of polycarbonate resin as a substrate material or discarded discs in manufacturing steps. A method for producing a high-quality optical disk material which can be used as a resin for a photosensitive optical disk, and a raw material for a optical disk and a compact disk produced by the method.

At present, the polymerization method of industrialized polycarbonate resin (hereinafter also referred to as PC resin) is more famous than interfacial polymerization using 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as a raw material (also That is, the phosgene polymerization method is a transesterification method using the same 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as a raw material (that is, a melt polymerization method).

However, most of the general PC resins polymerized by the interfacial polymerization method have p-third-butyl phenoxy group which is caused by p-tert-butylphenol as a reaction stopper (or terminal sealant). The p-cumylphenoxy group due to p-cumylphenol is the terminal structure of the polycarbonate molecular chain, and the PC resin polymerized by the transesterification method has a terminal structure of usually a phenoxy group.

Further, the optical disk substrate is formed into a mold of a sub-micro-scale "dent" or a guide groove called a "ditch" on the surface of the injection molding machine, and after the PC resin is injected into the mold. A resin plate that replicates the surface of the female mold. In order to form a 1.2 mm thick CD substrate and a 0.6 mm thick DVD substrate, it is required to have a viscosity average molecular weight (Mv) equivalent to 14,000 to 17,000 (viscosity: 37.2 to 44.1) in a PC resin as a raw material. It is 14500~16000 (viscosity: 38.3~41.8), and the better is 14900~15600 (viscosity: 39.2~40.6).

The fluidity depends on the molecular weight of the polycarbonate molecule. Therefore, as long as the viscosity average molecular weight (Mv) is the same, the PC resin polymerized by the interfacial polymerization method or the PC resin polymerized by the transesterification method can form a disc substrate. The PC resin polymerized by the general interfacial polymerization method is relatively easy to form. The reason for this is due to the difference in the glass transition temperature (Tg) of the above end structures, which is not known.

It is determined by DSC (ASTM D1525) such as 2,2-double (p-tris-butylphenoxy) having a viscosity average molecular weight (Mv) of 15200 in the terminal structure and a viscosity number (VN) of 40.0. -hydroxyphenyl)propane (bisphenol A) polymerized in the raw material of the PC resin has the same viscosity average molecular weight (Mv) 15200 in the end structure, conversion or viscosity number (VN) of 40.0 phenoxy 2, 2-Bis(4-hydroxyphenyl)propane (bisphenol A) is about 2 to 3 ° C when the Tg of the PC resin polymerized in the raw material, and the PC resin having a phenoxy group at the terminal structure has p compared to the terminal structure. a third-butylphenoxy PC resin which is the lower one. Tg different from this 2~3 °C is different from the forming difficulty.

Briefly, the viscosity average molecular weight (Mv) of 15200, converted to a viscosity number (VN) of 40.0, has a Tg of about 146 ° C in a PC resin having a p-third-butylphenoxy group, and is also in the end structure. The PC resin having a phenoxy group has a Tg of about 144 °C.

Further, the heat distortion temperature (1.82 N/mm ² ) (hereinafter referred to as HDT) measured by ASTM D648 was 126 ° C and 124 ° C which were reduced by about 20 ° C from Tg, respectively. However, the viscosity average molecular weight is equal, so there is almost no difference in fluidity.

With this resin, when the DVD-R substrate is to be molded, it is formed at a cylindrical temperature of 380 ° C of the injection molding machine and a mold surface temperature of 120 ° C.

After the resin cylinder is ejected, molded, and pressure-cooled in the mold cavity, the formed substrate is taken out from the mold and then taken out, and the T-third difference is formed in the end structure by a Tg difference of 2 ° C. The PC resin of the phenoxy group is cured at a higher temperature (although only 2 ° C), so it is taken out early.

The PC resin having a phenoxy group at the terminal structure is made under the same conditions as the PC resin having a p-tertiary-butylphenoxy group at the terminal structure, and when it is molded in the same molding cycle, the curing is slow, so that during demolding, It causes the warpage of the substrate to be small and difficult. A fatal defect occurred in a 1.2 mm thick CD substrate and a 0.6 mm thick DVD substrate.

Therefore, even if the Tg of the difference of 2 °C is only close to the HDT, the metal mold surface temperature is closer to the molding cycle, and the difficulty in forming the PC resin having a phenoxy group at the end is more apparent.

PC resin is widely used in optical materials, electrical and electronic fields, etc. However, it is not easy to include a recycling method by reusing an optical material in an equivalent product, and it is usually limited to a frame and then used. This is because the impurities in the recovery are mixed, and the molecular weight is lowered by the hydrolysis of the impurities. Further, in the removal of the impurities, the adhesion of the metal film occurs in the optical disk material, and the lubricant is mixed. Therefore, it is necessary to perform the washing and peeling treatment under strict conditions when separating the PC resin, and it is difficult to prevent the molecular weight of the PC resin from being lowered without selecting appropriate conditions.

As a method for reusing a PC resin used for a CD, an MD substrate or the like for an optical product, it is known that it is peeled off by an acid base (for example, Patent Document 1), by a mechanical chemistry method, by grinding. Techniques such as a method (for example, Patent Document 2), a method of jetting, and the like. However, in this technology, although the PC resin can be recovered, the PC resin of the interfacial polymerization method and the PC resin of the transesterification method cannot be separated and recovered. Therefore, even if the regenerated PC resin can be applied to a frame or the like, a molded article other than the optical disk can be used. It is not easy to apply to CDs.

Further, a regenerative system capable of supplying a regenerated plastic having a stable quality in a reclaimed product has been disclosed as a very large number of technologies (e.g., Patent Documents 3 and 4), which is characterized in that it has a completely distinguishing process of recycling and a discarded discarded disc. And the step of taking out the PC resin sheet from the pulverized PC resin sheet, in particular, Patent Document 3 is a step of ensuring the quality thereof, and the steps are not limited to the plastic product, but the old paper or the empty can The type is generally inferred from the recycling system, and the related methods are not specifically disclosed in Patent Documents 3 and 4.

In this state, the PC resin of the disc substrate can be reused as a resin for the disc substrate and cannot be recycled.

Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a used optical disc manufactured using a polycarbonate resin as a substrate material and/or a disc disposed in a manufacturing process as a defective optical disc, which can be reused as a disc substrate after being regenerated. A raw material for a disc manufactured by a method for producing a high-quality optical disk for use with a resin and a method thereof.

The inventors of the present invention conducted a close study on the above-mentioned problems, and found that the PC resin structure obtained by a specific polymerization method is distinguished by the difference in the structure of the PC molecules after the polymerization method or the like by the PC resin. The regenerated PC resin obtained after the recovery and chemical treatment can achieve the above problems, and the present invention can be completed.

That is, the present invention (1) is a method for producing a disc for recycling optical fibers from a waste resin which is a substrate material by using a polycarbonate resin as a substrate material, and which is used as a material for optical optical discs, and includes the following (a). (c) Step (a) Regarding the polycarbonate resin substrate from the discarded and/or recycled optical disc, by determining the monomer composition and the OH end fraction, it is discriminated whether the material resin of the substrate is a discrimination step of polymerizing a raw material divalent phenol of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as a separate raw material; (b) relating to being identified as bisphenol in the step (a) A is a waste material of a substrate-polymerized polycarbonate resin as a substrate for discarding and/or recycling, and is determined by measuring the glass transition temperature (Tg) and the viscosity average molecular weight (Mv) to be produced by an interfacial polymerization method. Or a discriminating step of a manufacturer manufactured by a transesterification method; (c) a discarding and/or recycling disc with a polycarbonate resin which is identified in the step (b) to be manufactured by an interfacial polymerization method as a substrate, Removing the impure substances contained by chemical treatment to make the metal residues The stock is an alkali metal, an alkaline earth metal, or an iron-based metal of 1 ppm or less, and the other heavy metals are 0.1 ppm or less of the impurity removal step, the optical disk raw material manufacturing method, and (2) the discarded and/or recycled optical disk. The polycarbonate resin substrate is a method for producing the optical disk material of the above (1) characterized by a pulverized product, and (3) the polycarbonate resin substrate from the discarded and/or recovered optical disk is characterized by a non-pulverized product. The above (1) manufacturing method of the raw material for the optical disc, and (4) as the processing step before the step (a) includes removing the polystyrene contained therein by passing the discarded and/or recycled optical disc through the polarizing plate. The method for producing a material for a disc according to the above (1) is characterized by the step of producing a substrate, and (5) the method for producing a raw material for a disc according to the above (4), after removing the step of preparing a polystyrene substrate, The appearance information of the disc is determined by (1) the polycarbonate resin produced by the interfacial polymerization method, (2) the polycarbonate resin not produced by the interfacial polymerization method, and (3) the interface polymerization cannot be specified. Polycarbonate resin manufactured by law, and will In the above (3), the polycarbonate resin substrate from which the optical disk is discarded and/or recovered is further processed in the step (a), and (6) before the chemical treatment in the step (c) is performed. A method for producing a raw material for a disc according to the above (1), which is characterized by pulverizing a polycarbonate resin substrate from a discarded and/or recycled optical disc, and (7) an impurity removed by chemical treatment of the step (c) The manufacturing method of the optical material for the optical disk (1) characterized by the reflective layer, the protective layer, the recording layer and the printed layer provided on the surface of the optical disk substrate, and (8) the chemical treatment of the step (c) The method for producing a material for a disc according to the above (1) to (7) which is characterized by the alkali treatment, and (9) the substrate for a disc which is characterized by the production method of the above (1) to (8), and (10) A disc in which the material for a disc of the above (9) is used.

[Best form of invention implementation]

In the method for producing a raw material for an optical disk according to the present invention, first, the polycarbonate resin substrate from which the optical disk is discarded and/or recovered in the step (a) must be distinguished by measuring the monomer composition and the OH terminal fraction. Whether the material resin is polymerized with 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as a raw material divalent phenol as a separate raw material.

The discarding and/or recycling optical disc used in the present invention is a recording medium CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RW or the like which uses a polycarbonate resin as a substrate. Such discarded and/or recycled optical discs may be directly in the shape of a disc-shaped product or may be in the form of a pulverized shape.

When the disc is discarded and/or the disc is directly in the shape of a disc-shaped product, as a processor before the step (a), the disc may contain a polystyrene substrate to protect the disc substrate, and the polystyrene substrate is The remover should be suitable. As a method of removing the imitation substrate of polystyrene, it is easy to recognize the birefringence of the substrate by using a polarizing plate, and it is prevented from being mixed.

Next, after the step of removing the polystyrene-like substrate, the substrate is discriminated by the appearance information of the optical disc as (1) PC resin by interfacial polymerization method, (2) PC resin not by interfacial polymerization method, (3) It is not possible to specify PC resin by the interfacial polymerization method, and it is not possible to specifically pulverize the PC resin by the interfacial polymerization method. It is recommended that the step of the step (a) or later is the same, the same, pulverization and/or waste. When recycling optical discs, it is recommended to use the distinguishing step after step (a).

Moreover, it is important that the discs are discarded and/or recycled in the same factory, and the containers of the same level of waste and/or recycled discs are processed by the processing.

Furthermore, discarding and/or recycling discs are various polycarbonate materials (for example, those produced by interfacial polymerization, blending by a transesterification method, homopolymers such as bisphenol A, or copolymerized polymers). The state of the mixture is not ideal, and it is preferable to discard and/or recycle the optical disc having the same trait.

<Step a>

In the step (a), the polycarbonate resin substrate from the discarded and/or recycled optical disc is determined by determining the monomer composition and the OH terminal fraction, and whether the material resin of the substrate is used as the raw material. A discrimination step of polymerization of 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) of phenol as a separate raw material.

In the present invention, it is necessary to distinguish whether the diphenol constituting the polycarbonate main chain is a separate raw material of bisphenol A or the like (for example, a copolymerized polycarbonate or the like).

Further, in the present invention, the polycarbonate raw material of bisphenol A is used as an optical optical disk material for recycling, and it is necessary to distinguish the raw material of bisphenol A or the like from the viewpoint of productivity.

As the discriminating method, the monomer composition and the OH terminal fraction of the discarded and/or recovered optical disc can be determined and identified by ¹ H-NMR analysis. In addition, other analysis methods also use the method of Fourier transform infrared spectroscopy (FT-IR).

In the method for producing a raw material for an optical disk according to the present invention, the method of the step (b), the discarding and/or recycling of the substrate in which the bisphenol A is used as a single raw material polycarbonate resin in the step (a) is used. It is important to distinguish between those manufactured by the interfacial polymerization method or by the transesterification method.

<Step b>

This step (b) is carried out by measuring the glass transition temperature (Tg) and the viscosity average molecular weight (Mv) to discriminate whether it is produced by an interfacial polymerization method or a discrimination step by a transesterification method. In the present invention, the monomer constituting the main chain is determined by using the bisphenol A as a separate raw material, which is produced by an interfacial polymerization method or by a transesterification method, and is preferably selected by the interfacial polymerization method. The reason for this is that polycarbonate is used as a raw material for optical optical discs, and those manufactured by the interfacial polymerization method and those manufactured by the transesterification method are warped by the transesterification method under the same molding conditions. Caused.

The discrimination method can be discriminated by measuring the glass transition temperature (Tg) and the viscosity average molecular weight (Mv).

Originally, polycarbonate produced by interfacial polymerization (using bisphenol A as a single diol raw material) and polycarbonate produced by transesterification (using bisphenol A as a single diol raw material) means As long as the same molecular weight, the interfacial polymerization method PC resin has a glass transition temperature of only 2 ° C higher, and thus can be distinguished by measuring the glass transition temperature (Tg) and the viscosity average molecular weight (Mv).

In the method for producing a raw material for an optical disk according to the present invention, as the step (c), it is necessary to remove the impurity by using the polycarbonate resin produced by the interfacial polymerization method identified in the step (b) as a substrate for discarding and/or recycling the optical disc. .

<Step c>

This step (c) is a step of removing impurities by chemical treatment by discarding and/or recycling the disc as the substrate of the polycarbonate resin produced by the interfacial polymerization method in the step (b). First, a heterogeneous layer such as a reflective layer, a protective layer, a recording layer, and a printed layer is provided on the surface of the polycarbonate substrate in the discarding and/or recycling optical disc. When these heterogeneous layers are used for recycling optical optical disc materials, they become Impure material, so be sure to remove it. The method for removing such impurities is to remove the heterogeneous layer which is an impurity by physical treatment, and to use the chemical treatment method of the treatment agent, and the present invention is processed by the operation efficiency. Chemical treatment of the agent. Specifically, it is preferable to use a chemical treatment method such as alkali treatment as disclosed in Japanese Patent No. 3270037.

In the present invention, in the case of alkali treatment, after pulverizing and discarding and/or collecting the optical disk, the pulverization size is made 0.05 to 3 cm, preferably 0.1 to 2 cm, and the heterogeneous layer which is an impurity is removed.

In order to remove foreign matter adhering during pulverization, it is preferred to perform washing of the pulverized recording medium disc in the surfactant. Among the surfactants, there are a nonionic surfactant, an anionic surfactant, and a cationic surfactant, and in the present invention, a nonionic surfactant and an anionic surfactant are preferred. Examples of the nonionic surfactant are, for example, a polyethylene glycol ether-based surfactant, and more preferably a polyethylene glycol ether of a higher alcohol or a polyethylene glycol ether of an alkylphenol. Further, examples of the anionic surfactant are, for example, sodium alkylbenzenesulfonate, and are preferably used in combination with a nonionic surfactant. The concentration of the surfactant is preferably 0.001 to 10% by mass, preferably 0.01 to 1% by mass.

In the alkali treatment, an aqueous solution (hereinafter referred to as an aqueous alkali solution) selected from an alkali compound such as potassium hydroxide, sodium hydroxide, sodium carbonate or potassium carbonate is used. The pH of the aqueous alkali solution is preferably from 10 to 14. The concentration of the aqueous alkali solution is preferably 0.1 to 20% by mass, more preferably 0.1 to 10% by mass. The washing temperature by the aqueous alkali solution is preferably 105 to 130 ° C. In addition, the processing time varies depending on the processing temperature, and is generally 15 to 60 minutes.

After the alkali treatment, it is preferred to wash the substrate in a mixed aqueous solution of a surfactant and hydrogen peroxide. By washing the substrate with the surfactant, the pigment and minute foreign matter adhering to the substrate and removed again in the aqueous alkali solution can be effectively removed. As the surfactant, those which are the same as those described above may be used, and the concentration may be the same as described above.

Examples of the peroxide include, for example, an oxide having a -O-O- bond, a metal peroxide having a polyvalent atomic valence, and hydrogen peroxide and a salt thereof, ozone, persulfuric acid, a salt thereof and the like. The concentration of the aqueous peroxide solution is preferably 0.1 to 10% by mass. Further, the temperature of the aqueous peroxide solution is preferably 65 to 95 ° C, more preferably 80 to 90 ° C. The processing time varies depending on the processing temperature, and is generally 15 to 60 minutes. The peroxide can effectively remove residual metals and dyes completely. The residual amount of the metal is required to be 1 ppm or less for the alkali metal, the alkaline earth metal, and the iron metal, and the metal other than the metal must be 0.1 ppm or less. For example, in the PC resin regenerated by the above chemical treatment, the solvent and container used for the chemical treatment, and the alkali metal, alkaline earth metal, and iron metal which are highly likely to be contained in the PC resin for recycling the optical disc can be used. It is 1 ppm or less, other metals such as Au, Ag, and Al, and the heavy metals such as Te, Sb, etc. derived from magneto-optical discs, phase-change disc recording layers, CD-R, DVD- The residual amount of the metal such as Cu derived from the organic dye used in the write-once optical disc of the R type can be made 0.1 ppm or less.

In particular, when the residual amount of the alkali metal, the alkaline earth metal, or the iron-based metal exceeds 1 ppm, the hydrolysis of the PC resin is caused by the optical disk storage environment, and the long-term reliability of the recorded data cannot be read.

Further, 0.1 to 10% by mass of the hydrogen peroxide liquid has a pH of 2 to 5 (weakly acidic) and can be used as the final washing liquid.

The optical optical disk reproduction material thus obtained can be used in the same manner as the general optical optical disk material.

In the regeneration system for producing a raw material for an optical optical disk of the present invention, the PC resin used as the substrate material is polymerized with 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) as a raw material. A monomer other than bisphenol A is polymerized as a raw material, or a polymer obtained by polymerizing bisphenol A as a raw material and a monomer other than bisphenol A as a raw material, or bisphenol A and its Anyone other than the monomer can be effectively distinguished and become a means of quality assurance.

Further, it is extremely important that the substrate material for the Blu-Ray Disc, which is one of the second-generation optical disc specifications of the present invention, is greatly affected. At present, Blu-Ray Disc's HD-DVD against horses can use PC resin of the prior art, and Blu-Ray Disc is more desirable from the viewpoint of water absorption, and copolymerized PC resin or polyolefin resin. However, the CD and DVD of the advanced technology constructed with PC resin are not easy to cause the Blu-Ray Disc to be registered once on the machine.

The invention can be called the same PC resin, in accordance with the chemical subtle structure of the different PC resin structure, in the difference. Recycling is an indispensable technology.

[Examples]

The invention will be more specifically illustrated by the following examples, but the invention is not limited thereto.

<Manufacture of raw materials for optical discs> (1) Pre-processing steps

A disc-shaped disc of about 100 kg in which aluminum as a heterogeneous layer was laminated on a polycarbonate substrate other than the product specifications recovered by the optical disc manufacturing was fed by extrusion molding. In order to remove the polystyrene substrate from the optical disc, the polarizing plate was used to observe the birefringence of the substrate, and then 265 sheets of polystyrene-like substrates of visible red color were removed.

(2) Step (a)

Next, a disk-shaped optical disk substrate portion was analyzed by ¹ H NMR, and then the divalent phenol monomer composition and the hydroxyl terminal fraction of the polycarbonate main chain constituting the substrate were specified.

Further, the measurement conditions were as follows: 45 mg of a PC resin sample was taken in a 5 mm diameter NMR tube, and dissolved in 0.4 ml of heavy chloroform, and then subjected to a 500 MHz NMR apparatus (JNM-LAMBDA500 manufactured by JEOL Ltd.) to measure ¹ H NMR spectrum.

[Method for measuring hydroxyl end fraction]

The peak of tetramethyl decane was set to 0 ppm, and the OH group of bisphenol A (BPA) observed by 6.68 ppm in ¹ H NMR spectrum was observed by the peak intensity (a) of the ortho position aromatic proton (a), 1.32 ppm. The p-tris-butylphenoxy group (PTBP) was calculated from the peak intensity (b) of the methyl proton, and the OH terminal fraction was calculated according to the following formula. OH end fraction (mol%) = (a/2) / (a / 2 + b / 9) × 100

[Monomer composition determination method]

The peak of tetramethylnonane was set to 0 ppm, and the peak of the BPA and the PTBP group observed by 7.21 ppm using the peak of the aromatic ring proton (c) and the OH group of the BPA observed by 6.68 ppm were used in the ¹ H NMR spectrum. The peak intensity of the aromatic ring proton (a) and the PTBP group observed at 1.32 ppm were determined from the peak intensity (b) of the methyl proton, and the monomer composition was calculated according to the following formula.

BPA composition (mol%) = ((a + c) / 8) / ((a + c) / 8 + b / 9) × 100 PTBP composition (mol%) = (b / 9) ((a + c) / 8 + b / 9) × 100

The OH end fraction of the optical disk recovered was 5.0 mol%, the BPA composition ratio was 94.5 mol%, and the PTBP composition ratio was 5.5 mol%. As a result, the recycled optical disc specifically made polycarbonate in which bisphenol A was made into divalent phenol.

(3) Step (b)

Next, the glass transition temperature (Tg) and the viscosity average molecular weight Mv were measured for a disc using bisphenol A as a divalent phenol as a substrate.

The glass transition temperature (Tg) was analyzed by DSC (differential phase difference thermal analyzer) based on ASTM D1525, and the specific glass transition temperature (Tg) was 146 °C. Further, the viscosity average molecular weight (Mv) was determined by measuring the viscosity of a methylene chloride solution at 20 ° C using a Uber Lauder type viscometer, and the ultimate viscosity [η] was determined and found to be 15,200 in the following formula.

[η]=1.23×10 ^-5 Mv ^0.83

As a result, the polycarbonate is specifically produced by an interfacial polymerization method.

(4) Step (c)

Then, the recovered disc-shaped optical disc is pulverized to a size of 0.1 to 2 cm, and then polyethylene oxide distyryl phenyl ether (emulgen A-500, manufactured by Kao (stock)) containing 1% by mass of a surfactant. In an aqueous solution of 1% by mass of sodium alkylbenzenesulfonate, stirring treatment was carried out at 90 ° C for 60 minutes. The mixture was treated with a 3 mass% aqueous sodium hydroxide solution at 120 ° C for 30 minutes. Further, it was treated with a 5% by mass aqueous sodium hydroxide solution at 120 ° C for 30 minutes. Subsequently, the mixture was mixed at 90 ° C for 30 minutes in a mixed solution in which the same amount of the same surfactant as above was mixed with 0.58 mass% of hydrogen peroxide. After washing with water, the mixture was sufficiently washed, and then dried at 80 ° C for 5 hours to obtain a recovered polycarbonate resin (recovered PC1). The Mv of the recovered PC1 was 15,200.

[Measurement of residual amount of metal]

The recovered PC1 was weighed and quantified in a Pt crucible, and carbonized at an electric furnace to raise the temperature to completely ash. After that, the residue was dissolved in the acid-soluble metal (Au, Ag, Al, Te, Sb, Cu, Co) by ICP (Inductively Coupld Plasma) analysis (device: IRIS Advantage, manufactured by JARRELL ASH), and the measurement results were performed. Na and Fe were 0.2 ppm, and Al, Te, Sb, and Cu were less than 0.1 ppm.

[Example 1]

(CD-R1) 50% by mass of a polycarbonate resin which was subjected to interfacial polymerization by a tabulation method, and a MD 1500 having a viscosity average molecular weight of 15200, and a recovered PC1 having a viscosity average molecular weight (Mv) of 15,000 was added to the recovered PC1. '. After the CD-ROM was formed by the same conditions (molding machine: Sumitomo SD 40ER, cylinder temperature: 350 ° C, injection pressure: 167 MPa, injection time: 2.5 seconds, cooling time: 2.2 seconds), the recovered PC1' and the MD1500 were formed. Can be obtained without problems can be made into CD = ROM1.

[Evaluation of Electrical Characteristics and Evaluation of Durability of CD-ROM] Polycarbonate resin by interfacial polymerization method by tempering and light-emitting, MD 1500 100% by mass of viscosity average molecular weight of 15200, that is, pure particles and CD-ROM1 Under the female mold, the CD-ROM 0 is formed. In these, the electrical properties of the AI film and the UV protective film after coating were evaluated.

In the signal intensity ratio of the dent-free mirror portion to the I ₁₁ dent, I ₁₁ Rmin (=I ₁₁ /I _TOP Reflective minimum value), the CD-ROM1 and CD-ROM0 have the same specification value of 0.6 or more. Both are 0.69.

In addition, the average of 5 CD-ROMs extracted from BLER (Block elalate) is 6, which is 18 compared to MAX. The average of 5 CD-ROMs is 2 and MAX is 8, which meets the requirements of Red Book. 220 or less.

The same CD-ROM1 and CD-ROM0 which were arbitrarily extracted from each of the five sheets were subjected to measurement of electrical characteristics after 168 hr in an environment of evaluation of durability of 80 ° C and humidity of 85%, and CD-ROM 1 in I ₁₁ Rmin. It is 0.61, CD-ROM0 is 0.63, BLER average CD-ROM1 is 15, MAX is 29, CD-ROM0 is 8 on average, MAX is 15 and all specifications are zero.

[Comparative Example 1]

(CD-R2) Adding 50% by mass of Taiwanese luminescence MD 1500 to PC2 (mixture of interfacial polymerization method PC resin and transesterification PC resin) with a Tg of 144 ° C and a viscosity average molecular weight (Mv) of 15200 After the recovery of PC2' with a viscosity average molecular weight (Mv) of 15100, the warpage of the CD-ROM (CD-ROM2) is increased under the same conditions as the MD 1500, and the warpage time is the same as that of the CD-ROM1. It is 1.2 times.

[Comparative Example 2]

(CD-R3) The disc-shaped disc recovered in the step (b) is pulverized to a size of 0.1 to 2 cm, and then subjected to a polyethylene oxide distyryl phenyl ether containing 1% by mass of a surfactant (emulgen A- 500, Kao (share) and 1% by mass of an aqueous solution of sodium alkylbenzenesulfonate were stirred at 90 ° C for 60 minutes. Further, a 3 mass% aqueous sodium hydroxide solution was used, and the treatment was carried out at 100 ° C for 20 minutes. Further, a 50% by mass aqueous sodium hydroxide solution was used, and the treatment was carried out at 100 ° C for 20 minutes. Next, the mixed solution of the same amount of the same surfactant as above and a corresponding amount of hydrogen peroxide of 0.58 mass% was mixed and treated at 90 ° C for 20 minutes. After washing thoroughly with water, it was dried at 80 ° C for 5 hours, and then the recovered polycarbonate resin (recovered PC3) was obtained. The Mv of the recovered PC3 was 15,200.

After the residual metal of the recovered PC3 was measured by ICP, it was found that Na and Fe were values exceeding 1 ppm (2.1 ppm), and Al, Te, Sb, and Cu were values exceeding 0.3 ppm (0.3 ppm).

The MD1500 (viscosity average molecular weight (Mv) 15200) obtained by an interfacial polymerization method prepared by adding 50% by mass to the PC3 was collected, and the recovered PC3' having a viscosity average molecular weight of (Mv) of 15200 was obtained. Using this recycled PC 3' to form a CD-ROM under the same conditions as the MD 1500 (CD-ROM 3), it can be easily produced.

The electrical characteristics and durability were evaluated in the same manner as in Example 1 for CD-R3. The initial I ₁₁ Rmin is 0.67 (specification value: 0.6 or more), the average BLER is 8, and the MAX is 22 (specification value: 220 or less). However, I ₁₁ Rmin after 168 hr in an environment of 80 ° C and 85% humidity. For 0.36, the average BLER is 41, and the MAX is 236. Compared with the initial stage, it is sharply deteriorated, and the durability is deteriorated.

[Industrial Applicability]

The present invention can provide a used optical disc manufactured by using a polycarbonate resin having different raw materials and a polymerization method as a substrate material, and/or a disc disposed in a manufacturing step, which is defective, by the distinguishing method and chemical treatment of the present invention. After the PC resin produced by the interfacial polymerization method of the phenol A is regenerated, it can be used as a method for producing a high-quality optical disc material for use in a resin for a disc substrate, and a raw material for a disc and a disc to be produced by the method.

Moreover, the optical disk of the present invention relates to the manufacturing process, and the electrical characteristics and durability of the optical disk are not inferior to those of the polycarbonate using the new product. The regeneration system of the present invention is constructed according to the structure of the PC resin which is different in chemical composition. distinguish. Recycling technology for a wide range of applications.

Claims (10)

A method for producing a raw material for a photosensitive optical disk, which is a method for producing a material for optical optical disk from a waste material which is discarded and/or recovered from a polycarbonate resin as a substrate material, and which comprises the following (a) to ( c) Step (a) Regarding the polycarbonate resin substrate from the discarded and/or recycled optical disc, by determining the monomer composition and the OH terminal fraction, it is discriminated whether the material resin of the substrate is used as a raw material a discriminating step of polymerizing 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) of divalent phenol as a separate raw material; (b) relating to being identified as bisphenol A in step (a) A polycarbonate resin which is polymerized as a single raw material is a substrate for discarding and/or recycling a disc, and is determined by measuring the glass transition temperature (Tg) and the viscosity average molecular weight (Mv) to be manufactured by an interfacial polymerization method, or a discriminating step of a manufacturer by transesterification; (c) a discarding and/or recycling disc with a polycarbonate resin which is identified in step (b) as being a substrate produced by an interfacial polymerization method. Removing the impure substance contained by chemical treatment to make the gold The residual amount of the genus is 1 ppm or less of an alkali metal, an alkaline earth metal, or an iron-based metal, and the heavy metal other than this is an impurity removal step of 0.1 ppm or less. The method for producing a raw material for a photosensitive optical disk according to the first aspect of the invention, wherein the polycarbonate resin substrate from the discarded and/or recycled optical disk is a pulverized product. The method for producing a raw material for a photosensitive optical disk according to the first aspect of the invention, wherein the polycarbonate resin substrate from the discarded and/or recycled optical disk is a non-pulverized product. The method for producing a raw material for a disc according to the first aspect of the invention, wherein the step of removing the polystyrene-prepared substrate contained therein by passing the discarded and/or recycled optical disc through the polarizing plate is as a step (a) Pre-processing steps. A method for producing a raw material for an optical disc, characterized in that in the manufacturing method of the fourth application of the patent application, after the step of removing the polystyrene-based imitation substrate, the substrate is discriminated by the appearance information of the optical disc as (1) by interfacial polymerization The polycarbonate resin to be produced, (2) the polycarbonate resin not produced by the interfacial polymerization method, and (3) the polycarbonate resin which cannot be specified by the interfacial polymerization method, and the above (3) The polycarbonate resin substrate from which the disc is discarded and/or recovered is further identified in the above step (a). The method for producing a raw material for a photosensitive optical disk according to the first aspect of the invention, wherein the polycarbonate resin substrate obtained by discarding and/or collecting the optical disk is pulverized before the chemical treatment of the step (c). The method for producing a raw material for an optical disk according to the first aspect of the invention, wherein the impurity substance removed by the chemical treatment of the step (c) is a reflective layer, a protective layer, a recording layer, and a printing provided on a surface of the optical disk substrate. Floor. The method for producing a raw material for a photosensitive optical disk according to the first aspect of the invention, wherein the chemical treatment of the step (c) is carried out by an alkali treatment. A material for a disc, which is obtained by the production method according to any one of claims 1 to 8. An optical disc characterized by using a material for a disc as in the ninth application of the patent application.