WO1997039868A1 - Procede de recuperation de resine - Google Patents
Procede de recuperation de resine Download PDFInfo
- Publication number
- WO1997039868A1 WO1997039868A1 PCT/JP1997/001239 JP9701239W WO9739868A1 WO 1997039868 A1 WO1997039868 A1 WO 1997039868A1 JP 9701239 W JP9701239 W JP 9701239W WO 9739868 A1 WO9739868 A1 WO 9739868A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording medium
- resin
- heated water
- recovery method
- substrate
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29K2705/02—Aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
- B29L2009/005—Layered products coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2017/00—Carriers for sound or information
- B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
- B29L2017/003—Records or discs
- B29L2017/005—CD''s, DVD''s
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/582—Recycling of unreacted starting or intermediate materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/911—Recycling consumer used articles or products
Definitions
- the present invention is, from the optical information recording medium whose surface is covered by a thin metal layer or a printing coating layer, more particularly c relates to a method for recovering a resin which is a substrate, the present invention, the optical information recording medium
- the present invention relates to a method for selectively removing a metal thin film layer and a printed film layer coated on the surface thereof and recovering the resin component as a substrate for reuse.
- Various optical information recording media such as a system capable of erasing or overwriting data, and a system in which these are added to increase the recording capacity, have been developed and marketed.
- Such an information recording medium is required to have a large amount and extremely high storage capacity and an extremely high quality, so that even if it has a minute defect, it must be a defective product.
- a large number of test samples must be taken from various parts of the production process in order to maintain high quality.
- a large number of compact discs dedicated to reproduction are produced, and the treatment of a large number of resin plates, such as samples, defective products, and products recovered from the market, has become a problem.
- such recording media have been made of transparent resins such as polycarbonate resin, polymethyl methacrylate resin, and amorphous cyclic polyolefin resin, and among them, most of the compact discs are made of polycarbonate resin. While large-scale production is being carried out, a large number of samples, defective products, etc. are being generated at the same time. These samples, defective products In the case of a transparent optical substrate before the information recording layer or reflective layer is applied, it is pulverized or libretted and mixed with a general polycarbonate resin or alloy with other resins without problems. Can be reused.
- transparent resins such as polycarbonate resin, polymethyl methacrylate resin, and amorphous cyclic polyolefin resin
- a resin plate provided with an information recording layer and a reflective layer, a protective coat layer such as a UV coat, and an adhesive layer for bonding (hereinafter sometimes referred to as a “coated resin plate”) ) Reuse is significantly limited.
- the UV-coat layer is incompatible with the polycarbonate resin. And the appearance is significantly impaired.
- the thermal stability of the adhesive is inferior to that of the resin, so that the hue may be deteriorated or the molecular weight of the resin may be reduced.
- the coated resin plate is chemically treated with, for example, an aqueous solution of an acid or alkali.
- these methods remove the UV coat layer and the label print layer by dissolving the metal part of the information recording layer and the reflective layer.
- layers such as inferior products of resin plates used for cleaning can not be removed, the need for a neutralization treatment after treatment and a neutralization step for wastewater is unavoidable. . (ii) Japanese Patent Application Laid-Open No. Hei 5—3 4 5 3 2 1
- the coated resin plate is immersed in hot water for a long time. Yes, it is excellent in that the neutralization treatment in the above-described method is not required.
- this method has a drawback that the polycarbonate resin substrate is susceptible to molecular weight reduction and whitening because it is immersed in hot water for a long time, and is not a preferable method for reusing the recovered resin. .
- the surface of the coating layer of the coated resin plate is mechanically cut and polished with a blade or an abrasive to remove the surface.
- These methods require a device to read the cut surface and a device to reverse the surface of the resin plate, so the initial investment is large, and there are also disadvantages such as cutting, which reduces the resin recovery rate. It was difficult to spread.
- a technique of bonding thin resin plates for the purpose of increasing the recording capacity has been developed, but a new problem has arisen that the resin portion is located outside so that grinding cannot be performed.
- the method of recovering resin from the coated resin plate described above is not economically and industrially satisfactory, and it is difficult to understand the quality and recovery rate from the viewpoint of resin reuse. there were.
- the conventional method was unsuitable especially when the resin molded product to be reused required transparency and high quality.
- a first object of the present invention is to provide an industrially advantageous method capable of effectively removing a coating layer from an optical information recording medium and selectively recovering a resin component.
- a second object of the present invention is to provide a method for recovering from an optical information recording medium without substantially deteriorating the quality of the resin of the substrate and without containing a coating layer. It is in.
- a third object of the present invention is to provide a method for separating a resin component and a coating layer component from an optical information recording medium by a method that does not cause pollution and that contributes to environmental preservation. is there.
- a fourth object of the present invention is to provide a method capable of recovering a large amount of resin components from an optical information recording medium with a compact device, particularly a continuous method.
- Another object of the present invention is to provide a method of recovering a resin from an optical information recording medium and further reusing the resin.
- the object of the present invention is to provide a resin substrate in which at least one surface is coated with a metal thin film layer, a print coating layer or a layer of a metal thin film and a print coating film.
- step A (1) a step of rolling the recording medium by passing the recording medium through at least one pair of openings (step A);
- step B (2) a step of bringing the rolled recording medium into contact with heated water (step B); (3) a step of separating a substantial amount of the coating film peeled from the recording medium (step C);
- step D (4) a step of pulverizing the obtained recording medium (step D);
- step E contacting the obtained recording medium strip with heated water to remove the metal thin film component
- Step F Step of separating the removed metal thin film components from the strip together with the heated water, and collecting and obtaining the strip
- the optical information recording medium from which the resin is to be collected uses a resin capable of transmitting infrared light or visible light as a material of the substrate, and the resin includes a dye or the like. And a resin colored in black, gold, or the like, and has a coating layer on one side of the resin or in the center of the bonded sandwich structure.
- the resin having the coating layer may be obtained as a sample or a defective product for inspection in the manufacturing process, or may be recovered as a product. Further, a resin substrate having no coating layer may be mixed as a part.
- the thickness of the resin substrate is not particularly limited as long as it is generally used as a recording medium, but is generally in the range of 0.5 to 3 mm, preferably in the range of 0.6 to 2 mm. Further, in the case of a bonded resin substrate, there is no limitation as long as the total thickness is in the above-mentioned range.
- the shape of the resin substrate is preferably a disk-shaped flat plate formed by injection molding, and can be used as it is in the recovery method of the present invention.
- a metal thin film for example aluminum, T e, F e, C o, G d, S i N ⁇ Z n S- S i 0 2, G e
- the metal thin film can be formed by means such as sputtering, vapor deposition and the like.
- this metal thin film has a thickness of 0.04 to 2 ⁇ m, and the surface of the metal thin film is covered with a protective film.
- This protective film is usually a UV-coated film of an acrylic resin and has a thickness of 5 to 10 m.
- a printed coating layer is formed directly on the resin substrate or on the metal thin film.
- This printed coating layer is generally called label printing, and the printed coating layer generally has a thickness of 5 to 30 m, preferably 10 to 25 zm.
- the coating film forming this print layer is, for example, an acrylic paint, an acrylic-vinyl paint, a vinyl paint, Polyester paints, melamine paints, epoxy paints and urethane paints are used.
- an adhesive for bonding two resin plates for example, acrylic, epoxy, and urethane-based adhesives are used, and they are used as an ultraviolet-curable hot-melt type.
- the metal thin film layer (including the protective coating layer thereon), the print coating layer, or the layer of the metal thin film layer and the print coating layer is formed on the resin substrate. Those covered are subject to collection. According to the present invention, the resin component can be selectively recovered by substantially removing the coating layer from such a coated resin substrate.
- the substrate in the information recording medium on which the coating layer is formed and the substrate from which the coating layer is removed may be collectively referred to as a “resin substrate”.
- pulverized substrates are sometimes referred to as “substrate strips”.
- the coated resin substrate include R0M disks such as a compact disk, a mini disk, and a laser disk for a read-only type, and a CD-ROM for a recording and reproduction type.
- DRAM discs such as R and write-once discs
- rewritable discs include E-DRAW optical discs such as magneto-optical discs and phase-change optical discs.
- These optical discs include a single-sided storage type and a recently-developed two-layer type for DVD.
- the method of the present invention is particularly useful for recording media, preferably compact disks and DVDs, in which an aluminum thin film layer is formed as a metal thin film layer and a printed coating film layer is formed on a part of the aluminum thin film layer. This is an excellent method for selectively recovering resin components.
- the material constituting the substrate of such a resin plate may be a light-transmitting resin.
- polycarbonate resin, polymethyl methacrylate resin, amorphous cyclic polyolefin resin, etc. are used. Among them, polycarbonate resin or methyl methacrylate resin is preferred. However, polycarbonate resin is most preferred.
- the above-mentioned polycarbonate resin may be one which is usually used as a thermoplastic aromatic polycarbonate resin molded article, and is generally produced by reacting a divalent phenol with a carbonate precursor by a solution method or a melting method. Therefore, whatever is obtained by either method can be used in the same way.
- divalent phenols used in the production of the aromatic polycarbonate resin include hydroquinone, resornol, 4,4'-dihydroxydiphenyl, bis (4- 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane [commonly known as bisphenol A], 2,4-bis (1,2-bis (4-hydroxyphenyl) ethane) 4-Hydroxyphenyl) 1 2—Methylbutane, 1,1-bis (4-hydroxyphenyl) -cyclohexane, 1,1bis- (4-hydroxyphenyl) 1,3,3,5—Tri Methyl cyclohexane, 'bis- (4-hydroxyphenyl) -10-diisopropylbenzene, ⁇ , ⁇ ' —bis- (4-hydroxyphenyl) -1m-diisopropylbenzene, ⁇ , Na'-bis- (4-hydroxyphenyl) -r- ⁇ -d
- bisphenol A homopolymer bisphenol A 1,1,1-bis (4-hydroxyphenyl) -cyclohexane, 1,1-bis- (4-hydroxyphenyl) -13,3,5- Dimethylcyclohexane, ⁇ , ⁇ '-bis- (4-hydroxyphenyl) -m-di-so-propyl-benzene, 2,2-bis- (3-methyl-14-hydroxy-phenyl) -propane, 2, 2—Bis (3,5—dimethyl-4-hydroxyphenyl) propane, 2,2—bis (3,5—dichloro mouth—4—hydroxyphenyl) propane and 2,2—bis (3,3 Copolymers obtained from at least two kinds of bisphenols selected from propane, especially 1, 1-bis- (4-hydroxyquinphenyl) 3, 3, 5 — trimethylcyclohexane and bisphenol A, a '-bis (4-hydroxyphenyl) 1 m-diisopropyl benzene or 2,2-bis (3-methyl Chill
- Examples of the carbonate precursor include carbonyl halide, carbonic ester and haloformate, and specifically, phosgene, diphenyl carbonate, dihaloformate of divalent phenol, and the like. And mixtures thereof.
- suitable molecular weight regulators, branching agents, A catalyst or the like can be used according to a usual method. Two or more aromatic polycarbonate resins thus obtained may be mixed.
- the above-mentioned methyl methacrylate resin is a resin obtained by using a methyl methacrylate monomer as a main raw material and polymerizing the same.
- homopolymers are usually used, but other copolymerizable monomers, specifically methyl acrylate, ethyl acrylate, propyl acrylate, and acrylic acid
- copolymers of methacrylates such as butyl or methacrylate, such as methacrylate, ethyl methacrylate, methacrylate, butyl methacrylate, etc., of 10 mol% or less. can do.
- the polymerization method is not particularly limited, and a production method such as bulk polymerization, suspension polymerization, solution polymerization, or emulsion polymerization is used.
- Examples of the amorphous cyclic polyolefin resin include hydrogenated products of a ring-opening polymer of a norbornene-based monomer.
- Such norbornene-based monomers include, for example, norbornene, dimetanooctahydronaphthalene, trimetanododecahydroanthracene, and alkyl- and alkylidene-substituted products thereof, dicyclopentane, 2.3-dihydroxycyclohexane.
- Pentagen dimetanooctyl hydrobenzoindene, dimetanodeca hydrobenbuindene, dimetanodecahydrofluorene and alkyl-substituted products thereof can be mentioned. Further, it may have a polar substituent such as a halogen atom, an ester residue, an ether residue, or a cyano group. Of these, those having two or more functionalities make injection molding difficult, and those having one function are preferably used.
- norbornene monomers may be used alone or in combination of two or more.
- copolymers such as cyclopentene, cyclobutene, cyclopentene, cyclopentene, cycloheptene, cyclooctene, and 5,6-dihydroxycyclopentadiene are usually used as copolymer components. It can be used in the range of not more than% by weight.
- acyclic olefins may be used as the molecular weight regulator, and among them, ⁇ -olefins such as 1-butene, 11-pentene, and 11-hexene are particularly preferable.
- the ring-opening polymer of a norbornene-based monomer is preferably produced by a usual method for polymerizing norbornenes. It is preferable to use a well-known metathesis catalyst as a polymerization catalyst.
- a metathesis catalyst a catalyst system containing a transition metal compound such as titanium tetrahalide and an organic metal such as an organic aluminum compound or a combination of a third component such as an aliphatic or aromatic tertiary amine is used. Catalyst systems are preferred.
- Ring-opening polymerization can be performed without using a solvent, but usually, aromatic hydrocarbons such as benzene, toluene, and xylene, aliphatic hydrocarbons such as hexane and heptane, and alicyclic hydrocarbons such as cyclohexane It is carried out in an inert organic solvent such as a hydrocarbon or a halogenated hydrocarbon such as dichlorene. Further, the polymerization temperature is usually selected from the range of ⁇ 20 to 100, and the polymerization pressure is selected from the range of 0 to 50 kg / cm 2 or less.
- aromatic hydrocarbons such as benzene, toluene, and xylene
- aliphatic hydrocarbons such as hexane and heptane
- alicyclic hydrocarbons such as cyclohexane
- the polymerization temperature is usually selected from the range of ⁇ 20 to 100
- the polymerization pressure is selected from the range of
- the ring-opened polymer of the norbornene-based monomer preferably has a Tg of 120 to 200 ° C. in order to use the hydrogenated product as a material for the optical transparent substrate.
- a hydrogenated product of a ring-opening polymer of a norbornene-based monomer is produced by using a well-known hydrogenation catalyst.
- any catalyst generally used for hydrogenation of an olefin compound can be used.
- Wilkinson complex cobalt / triethyl aluminum acetate, nickel acetyl acetate Toner / triisobutylaluminum, rhodium, radium-carbon, rutin-mica-carbon, nickel-diatomaceous earth.
- the hydrogenation reaction is carried out at 0 to 250 ° C. under a hydrogen pressure of 1 to 200 atm in a homogeneous or heterogeneous system depending on the type of the catalyst.
- the hydrogenation rate is preferably 95% or more, and more preferably 99% or more, from the viewpoint of heat deterioration resistance and light deterioration resistance.
- An addition polymer of a norbornene-based monomer is also mentioned as an example of the amorphous cyclic polyolefin resin.
- a homopolymer of a norbornene-based monomer is also used, but a copolymer obtained by copolymerizing ethylene is preferable. Often used.
- the norbornene-based monomer the same ones as described above are used.
- the coated layer can be removed and separated from the resin substrate by the following steps A to F of the coated resin substrate as it is, and the resin component can be isolated and recovered.
- the coated resin substrate is rolled by passing it through at least one pair of rollers.
- the resin substrate is rolled so that the length rolled by the roller is 1.0 to 2.0 times, preferably 1.1 to 1.8 times the original length. .
- the gap between the pair of rollers should be 0.05 to 0.8 times, preferably 0.1 to 0.7 times the original thickness of the resin substrate so that the resin substrate is rolled in the above range. It is desirable.
- the temperature of the roller is 30 to 140 ° C., preferably 60 to; L 30. It is desirable to maintain the temperature at C.
- the number of mouths may be one or two or three. It can be passed several times using a one-mouthed collar.
- the rotation directions of the one-to-one rollers are usually different from each other, and the two rollers may be rotating at the same circumferential speed or may have a difference in circumferential speed.
- the difference between the circumferential velocities may be such that the ratio of the circumferential velocities with the higher speed to the circumferential velocities with the lower speed is about 1.05 to 2 times.
- the difference between the circumferential speeds of the pair of rollers in step A of the present invention is not particularly necessary, and may be substantially the same. However, if the circumferential speed of each roller is different, shearing is more likely to occur, which is advantageous.
- -12-It may be.
- a peripheral speed difference of 1 cm / sec or more is preferable.
- Particularly preferred is 3 to: L O cm Z sec, and if it exceeds 15 cm Z sec, an extreme warping phenomenon occurs, making subsequent handling difficult and not preferable. It is advantageous to increase the number of times of rolling, but in most cases, rolling several times is sufficient to obtain the effect.However, rolling in not only a single direction but also in multiple directions is easier and more advantageous. is there. Further, maintaining the surface temperature below the glass transition temperature of the resin by heating the nozzle is advantageous in reducing the rolling pressure and extending the mechanical life.
- the mouthpiece used is not particularly limited as long as it is industrially used, and is basically made of a material that is harder than a resin substrate and does not cause deformation.
- a material that is harder than a resin substrate and does not cause deformation For example, steel, plating steel, stainless steel and the like can be mentioned. Of these, stainless steel is preferred in terms of preventing Yasushi.
- the surface of the roller 1 may be mirror-finished, pear-finished, or other concave and convex, but a mirror-finished surface is usually used.
- step A it is necessary to roll the resin substrate and roll it in its length direction, and it is not particularly necessary to apply stress to the surface of the resin substrate, particularly to the coating layer and the resin substrate.
- the resin substrate obtained in the step A (hereinafter sometimes referred to as “rolled resin substrate”) is brought into contact with heated water.
- Step B does not require any special equipment or chemicals, uses an appropriately sized container (or tank), and uses heated water.
- the rolled resin substrate obtained in the step A comes into contact with the heated water, causing a distortion between the coating layer and the resin substrate, and separating the coating layer, especially the printed coating layer. It will be easier.
- the resin substrate and the heated water in the container so that the heated water and the rolled resin substrate are effectively in contact with each other and the resin substrates are entangled with each other.
- Resin substrates By repeatedly contacting and separating from the substrate, the printed coating film can easily delaminate from the substrate. At that time, the separation is also promoted by the action of the heating water.
- the temperature of the heating water is preferably in the range of 50 to 100, preferably 70 to 95.
- the range of (: is particularly preferable. When the temperature of the heating water is lower than 50 ° C., the time becomes longer, and the peeling of the printed coating film is not effectively performed.
- the contact time between the heated water and the resin substrate in the step B is usually practically 3 to 60 minutes, preferably 5 to 30 minutes.
- the component of the heating water water alone is sufficient, but even if it contains not more than 20% by weight, preferably not more than 10% by weight of another solvent which does not dissolve the resin and is soluble in water. No problem.
- solvents include alcohols, glycols or ketones. If the resin is an aromatic polycarbonate, it is preferably an alcohol.
- the step B is performed by an apparatus in which the resin substrates are repeatedly separated from each other, and the heated water is in contact with the resin substrates.
- a method in which a resin substrate and heated water are put in a container and the resin substrates are separated from each other in this container and stirred or brought into contact with the heated water or the container is rotated.
- the resin substrate and the heated water can be effectively separated from each other by setting the ratio in an appropriate range. If too much heated water is used, the resin substrates will not be effectively separated from each other and will not be sufficiently contacted.
- a preferred range is between 0.1 and 30% by weight of the substrate, especially between 0.5 and 15% by weight, based on the sum of the two. Most preferred is in the range of 1 to 10% by weight.
- a rotating drum is provided inside the container, and a resin substrate and A preferred embodiment is a method in which the resin substrate is repeatedly separated from each other and the resin substrate and the heated water are brought into contact with each other by adding water and heated water and rotating the drum.
- a rotating drum having a large number of pores on the side wall is suitable.
- the pores of the rotating drum help the separated strips of printed coating separate with the heated water out of the drum.
- a rotating drum is installed in a container having heated water, a resin substrate is supplied from one end of the rotating drum, and the resin substrates are separated from each other in the rotating drum in the presence of heated water.
- the strips of the peeled print film were discharged out of the drum together with the heating water through a number of pores provided on the side wall of the drum, while the print film was substantially removed from the other end of the rotating drum. It is preferable to take out the resin substrate.
- the rotary drum has an internal structure such that the supplied resin substrate moves slowly from one end to the other end according to the rotation.
- a structure in which a spiral partition plate is provided inside the drum is preferable.
- the drum may be provided with several sections so that the resin board moves to the next section after a certain amount of the resin substrate has accumulated, and a weir may be provided between the sections.
- the rotating drum may be of a vertical type, a horizontal type or an inclined type, but a horizontal type or a gentle inclined type is advantageous.
- the small pieces of the printed coating film discharged from the pores on the side wall of the rotating drum are taken out of the container together with the heating water, the small pieces are filtered out, and the heated water can be returned to the container and used again. Thus, less heating water can be recycled and heat loss is reduced.
- step B the printed coating film applied on the resin substrate surface is substantially separated, and the coated film is separated into heated pieces in strips.
- step C the coating film strips separated from the substrate are separated. Step C does not require any special equipment. That is, the coating film strip separated from the substrate can be separated by putting a large amount of water or heated water in a container and stirring the container.
- the coating film strips can be separated by dispersing the coating film pieces in water or heated water and taking out the container. Further, if necessary, water or heating water may be further added, and the coating film fragments can be separated and removed by showering the substrate with water or heating water.
- Step C can be performed in the same apparatus (vessel) as step B, which is more advantageous. That is, a method in which the resin substrate is brought into contact with heated water (Step B) and the separated coating film fragments are separated (Step C) in a single vessel is advantageous, and particularly preferably these steps are carried out. A method which is carried out continuously in one vessel is advantageous.
- the apparatus in which the rotating drum is provided in the container is used to perform the step B, and the separation is performed through the fine holes provided on the side wall of the rotating drum.
- the coated film strips are discharged together with the heating water to the outside of the drum, and then the strips are taken out of the container together with the heating water to carry out the step C.
- This method using a rotating drum is preferable because it is possible to easily carry out the steps B and C continuously, and it is possible to treat a large amount of resin substrates.
- Step C a resin substrate from which the coating layer has been substantially separated and removed is obtained.
- an elliptical disc that has been rolled in step A and has a separated coating layer can be obtained.
- Step D is a step of pulverizing the rolled resin substrate. If the coating film fragments are present during the pulverization of the resin substrate, they may adhere to the resin substrate again. Therefore, it is advantageous to remove the peeled coating film fragments as much as possible.
- the means for pulverizing the resin substrate in step D is not particularly limited, and ordinary means for pulverizing a plastic plate is employed.
- a method using a cutting type or a hammer type pulverizer can be cited, and a cutting type pulverizer is preferably used because the amount of generated fine powder is small.
- a crusher having a rotating rotary blade and fixed blade, and having a circular screen at the bottom is preferably used. By using this, it is possible to pass a screen with little fine powder from the resin substrate It is possible to obtain only a small strip of the resin substrate.
- the crushed resin substrate strip may be uniform in shape or size, or may be random.
- the size is such that 90% by weight of the hole substantially does not pass through a hole having a diameter of 15 mm and does not pass through a hole having a diameter of 2 mm. If the size of the resin substrate strip is larger than the above range, it becomes difficult to effectively remove the metal thin film component in the next step E, and if the strip is too small, the pulverization process becomes complicated. And the handling of the obtained strips is troublesome, which is not preferable.
- the strip of the resin substrate obtained in the step D is brought into contact with heated water in the step E to remove the metal thin film component coated on the substrate surface.
- This E process does not require special equipment or chemicals, and uses heated water in a container (or tank) of appropriate size.
- step E a force that removes the metal thin film component on the substrate surface by bringing heated water into contact with the substrate strip obtained in the step D ⁇
- the residual coating layer is almost completely removed in this E step.
- the heating water and the substrate strip can be effectively brought into contact with each other, and the substrate strip and the heating water can be flowed at an appropriate ratio in the container so that the substrate strips are entangled with each other. I like it.
- Substrate strips come into contact with each other, and by repeating separation, metal thin film components are removed from the substrate. It is easier to remove. The removal is promoted by the action of the heating water.
- the temperature of the heating water in the E step is preferably in the range of 50 to 100 ° C, particularly preferably in the range of 70 to 95 ° C. If the temperature of the heating water is lower than 50, the time required for removing the metal thin film component tends to be long. On the other hand, if the heating temperature exceeds 100 ° C., pressurization is required, so that the apparatus becomes complicated, and it is not only expensive, but also causes deterioration of the resin. It is practical that the contact time between the substrate strip and the heating water in the E step is usually 10 to 60 minutes, preferably 20 to 40 minutes.
- the component of the heating water water alone is sufficient, but even if it contains not more than 20% by weight, preferably not more than 10% by weight of another solvent which does not dissolve the resin and is soluble in water. No problem.
- a solvent include alcohols, glycols, and ketones.
- the resin is an aromatic polycarbonate, it is preferably an alcohol.
- the step E is performed by an apparatus in which the substrate strips repeatedly separate from each other and the heated water comes into contact with the substrate strips. Specifically, a method is used in which a substrate strip and heated water are put into a container, and the substrate strips are separated from each other in this container and stirred or brought into contact with the heated water. Is done.
- the substrate strips can be effectively separated from each other. If too much heated water is used, the substrate strips will not effectively separate and contact will not be sufficient.
- the preferred proportion is such that the weight of the substrate strip is from 1 to 50% by weight, preferably from 2 to 30% by weight, particularly preferably from 3 to 20% by weight, based on the sum of the two.
- a rotating drum is installed in the container, and the substrate strip and the heating water are put in the drum, and the heating water and the substrate strip are brought into contact with each other while rotating the drum to separate the substrate strips from each other. I prefer the way It is a mode that is not good.
- a rotating drum having a large number of pores on its side wall is appropriate.
- the pores in the side wall of the rotating drum help the removed metal thin film components to separate out of the drum together with the heated water.
- the rotary drum is placed in a container with heated water, supplied to the substrate strip from one end of the rotary drum, While separating the substrate strips from each other in the rotating drum in the presence of heated water, the separated metal thin film component is discharged together with the heated water from the pores provided on the side wall of the drum, and the other components of the rotating drum are removed. It is preferable to take out the substrate from which the metal thin film component and the coating layer have been removed continuously from the end of the substrate.
- the rotating drum has an internal structure such that the supplied substrate strip moves slowly from one end to the other as it rotates.
- a structure in which a spiral partition plate is provided inside the drum is preferable.
- the rotating drum may be of a vertical type, a horizontal type or an inclined type, but a horizontal type or a gentle inclined type is advantageous.
- the metal thin film component discharged from the pores on the side wall of the rotating drum is taken out of the container together with the heating water, the solid component is filtered off, and the heating water can be returned to the container and used again. Thus, a small amount of heated water can be recycled and heat loss is reduced.
- the metal thin film on the surface of the resin substrate is aluminum
- the aluminum thin film is most likely dissolved in heated water as aluminum hydroxide and removed as a solution.
- the force of dissolving in the heated water the force of whether it is removed while melting or whether they occur in parallel is not clear ⁇ It is certain that a substrate from which the metal thin film has been almost completely removed can be obtained.
- the inventors of the present invention speculate that even in step B, metal aluminum It is considered that some dissolution of the thin film in the heated water occurred.
- the metal thin film component and the remaining coating film component separated in the step E are separated from the substrate strip together with the heated water, and the strip is collected and obtained as a resin component.
- This F process does not require any special equipment. That is, the metal thin film component separated from the substrate strip can be easily separated from the substrate strip together with the heated water. If necessary, after the step E is completed, water or heated water can be further added to separate from the substrate strip. Further, by showering water or heated water on the substrate strip, metal thin film components can be separated.
- step F can be carried out in the same apparatus (vessel) as step E, which is more advantageous. That is, a method in which the substrate strip is brought into contact with heated water (step E) and separated from the removed metal thin film component (step F) in a single vessel is advantageous, and particularly preferably these methods are used. It is advantageous to carry out the process continuously in one vessel.
- step E using a device in which a rotating drum is provided in a container, the step E is performed, and separation is performed through pores provided on the side wall of the rotating drum.
- the metal thin film component is discharged together with the heated water to the outside of the drum, and then the metal thin film component is taken out of the container together with the heated water, thereby performing the step F.
- This method using a rotating drum is preferable because the steps E and F can be easily performed continuously, and a large amount of substrate strips can be processed.
- the steps A, B, C, D, E and F of the present invention can be carried out continuously, which is industrially advantageous.
- the coating layer can be selectively and efficiently removed from the optical information recording medium coated with the metal thin film and the printed coating layer, and the resin substrate can be recovered at a high level. Rate and deterioration of physical properties Less can be collected.
- the steps A to F of the present invention are simple in method and do not require a complicated apparatus, and can process a large amount of resin substrates with a small apparatus.
- the recording medium is supplied between at least one pair of rollers and rolled (Step A).
- the rolled recording medium is supplied to one end of a rotating drum having pores, and the recording medium is brought into contact with heated water while being entangled with each other in the rotating drum (Step B).
- step C (3) The substantial amount of the coating film separated from the recording medium is separated from the pores of the rotating drum, and the recording medium is taken out from the other end of the rotating drum (step C).
- step E) feeding the strip of the recording medium to one end of a rotating drum having pores, bringing the strip into contact with heated water in the rotating drum (step E),
- step F The resin thin film component removed from the pores of the rotary drum is separated together with the heated water, and strips are taken out from the other end of the rotary drum (step F). is there.
- the resin substrate strips recovered according to the present invention do not contain a coating layer, are hardly degraded in quality, and can be directly melted and reused.
- it can be used by mixing with the same type of resin, or can be used by blending with another resin.
- the collected resin substrate strips may be used as they are, or may be made of the same polycarbonate resin or a different type of resin. It can be mixed with bottle resin and reused to be used as molded products.
- a thermoplastic resin such as an ABS resin or a polyester resin and reused to obtain a molded product.
- Peeled state-2 The non-peeled coating layer remains partially or dotted or a part of the multilayer coating layer remains on the entire surface
- the rolled resin substrate had a length (major axis) of 13.8 cm, was rolled to 1.15 times the original substrate length, and had a crack in the coating layer on the entire surface.
- the sample was immersed in heated water at 90 ° C for 5 minutes and stirred while swelling.
- the ratio of the resin substrate was 5% by weight with respect to the total amount of the resin substrate and the heated water, and the label printing layer and the protective coat layer were mainly separated (Step B).
- the resin substrate is washed with water to remove the peeled coating layer, thereby obtaining a resin substrate (Step C).
- the resin substrate has a rotary blade and a fixed blade for rotating the resin substrate, and an 8 mm circular hole screen is provided below. It was pulverized by a provided pulverizer (D process).
- This substrate strip was immersed in a heated water at 90 ° C. for 30 minutes with stirring to remove mainly aluminum vapor deposition components (Step E). At this time, the ratio of the substrate strip was 15% by weight based on the total of the substrate strip and the heated water. Thereafter, the aluminum vapor-deposited components removed from the substrate strip were separated together with the heated water, and a transparent polycarbonate resin substrate strip was recovered (Step F).
- the obtained polycarbonate resin substrate strips were pelletized by a conventional method, dried for 5 hours at 12 TC, and then molded at 270 ° C by an injection molding machine manufactured by Nippon Steel Works, Ltd. did. No foreign matter was observed in the molded product, and no irregularities were observed on the surface.
- the impact value is also 5 k g f ⁇ c / cm , a viscosity-average molecular weight of the specimen in 1 5, 00 0, been made but almost equivalent to the initial poly force one Bonnet one Bok resin. Examples 2 and 3
- Example 1 Using the various resin plates shown in Table 1, the same procedures as in Example 1 were performed except for the conditions shown in Table 1, and the results are shown in Table 1.
- Resin plate A Substrate Z Aluminum deposition layer / UV coating layer Z label printing layer
- Resin plate B Substrate Aluminum deposition layer ZUV coating layer
- Resin plate C Label printing layer Substrate Z Aluminum deposition layer ZUV coating layer Novel printing layer
- Resin plate D Substrate aluminum evaporated layer ⁇ V coat layer / label printing layer
- the resin plates A to C are aromatic polycarbonate resins having a thickness of 1.2 mm, a water absorption of 0.20% by weight, a viscosity average molecular weight of 15, 100, and a divalent fuanol component of bisphenol A.
- the thickness of the aluminum deposition layer is 0.1 m
- the thickness of the UV coating layer (protective coating layer) is 5 to: L 0 m
- Thickness should be 20 m "S> 0
- the substrate of the resin plate D is a substrate made of copolymerized polycarbonate resin having a viscosity average molecular weight of 15,000 and a water absorption of 0.19% by weight, and the copolymerized polycarbonate is a divalent phenol. It is a 70:30 (mol%) copolymer of bisphenol A and 1,1-bis (4-hydroxyphenyl) -13,3,5-trimethylcyclohexane.
- the substrate of the resin plate E is 0.6 mm thick, has a water absorption of 0.20% by weight, a viscosity average molecular weight of 15, 100, and has a divalent phenol component of bisphenol A.
- Aromatic polycarbonate Teijin Chemical Co., Ltd.
- the thickness of the aluminum deposition layer is 0.1 ⁇ , and the thickness of the UV coat layer (protective coat layer) is 5 to 10 // m.
- Process B Water temperature (° c) 90 8 0 90 90 Time (min) 10 15 15 0 10 Resin substrate ratio (% by weight) 5 8 5 5
- Resin substrate A consisting of a label print layer (20 m) is continuously supplied to the washing machine, and heated with 40 ° C hot water for 1.5 seconds to remove dust on the resin substrate surface. Cleaning was performed.
- the rolled resin substrate had a length (major axis) of 15.8 cm, and was rolled to 1.32 times the original substrate length, and cracks occurred in the coating layer on the entire surface.
- the continuously discharged rolled resin substrates were conveyed one after another by a conveyor and supplied to one end of a rotating drum.
- This rotating drum has 17 mm pores on the side walls, and four sections are provided inside the drum by three dams.
- the drum rotates. It is structured to move to the next area.
- the number of rotations of the drum and the weir plate are adjusted so that the rolled resin substrate stays in the drum for 10 minutes, and the ratio of the resin substrate becomes 3% by weight based on the sum of the resin substrate and the heating water. In contact with 80 heated water (B).
- the label printing layer and the protective coating layer mainly peeled off from the resin substrate are separated from the pores together with the heated water (Step C), and the resin substrate from which the separated coating layer is substantially removed is rotated. It was continuously discharged from the other end of the drum.
- These resin substrates were supplied to a crusher manufactured by TORAI Co., Ltd., which had a rotary blade and a fixed blade that rotate continuously as they were, and was provided with a 1-Omm circular screen at the bottom (process D). .
- the substrate was contacted with 90 pieces of heated water for 25 minutes in the rotating drum so that the proportion of the substrate pieces was 8% by weight with respect to the sum of the substrate pieces and the heated water (Step E).
- the aluminum deposition component mainly removed from the substrate strip was separated from the pores together with the heated water, and the transparent substrate strip from which the coating layer had been removed was continuously discharged from the other end of the rotating drum ( F process).
- small resin flakes of less than 2 mm were discharged out of the rotary drum through the pores together with the heated water.
- These substrate strips are successively introduced into one end of a rotary drum type centrifugal dehydrator, and while blowing hot air at 125 ° C into the rotary drum, the substrate strips are dehydrated and pre-dried for 2 minutes.
- the substrate strip discharged from the other end was carried to a hopper dryer and dried at 120 for 5 hours. Thereafter, a test piece was molded at 270 using an injection molding machine manufactured by Japan Steel Works, Ltd.
- Example 8 Using the various resin plates shown in Table 3, the same procedures as in Example 8 were carried out except for the conditions shown in Table 3, and the results are shown in Table 3.
- the resin substrate A was finely ground as it was without performing a rolling step or a step of bringing it into contact with heated water, and pelletized in the same manner as in Example 1 to form a test piece. Table 5 shows the results.
- the resin substrate A was brought into contact with heated water at 120 ° C. for 600 minutes without performing the rolling step. Thereafter, the resin substrate was finely crushed, pelletized in the same manner as in Example 1, and a test piece was formed. Table 5 shows the results. Comparative Example 3
- the resin substrate A was subjected to the processes after the process B in the same manner as in Example 1 under the conditions of Table 5 without performing the rolling process.
- Table 5 shows the results.
- the resin substrate A was rolled under the conditions shown in Table 5 in the same manner as in Example 1.
- the rolled resin substrate was finely crushed without contact with heated water, pelletized as in Example 1, and a test piece was prepared.
- Table 5 shows the results.
- the present invention it is possible to easily recover and reuse a resin component from an optical information recording medium which has been treated as industrial waste with almost no value. It greatly contributes to resource recycling from development and global environmental protection, and is extremely effective industrially. Moreover, the process is simple, there is no pollution, and it is industrially advantageous.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997622932 DE69722932T2 (de) | 1996-04-19 | 1997-04-10 | Verfahren zum wiedergewinnen von harzen |
US09/171,231 US6060527A (en) | 1996-04-19 | 1997-04-10 | Method of recovering resin |
EP19970915702 EP0900639B1 (en) | 1996-04-19 | 1997-04-10 | Method of recovering resin |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9797096 | 1996-04-19 | ||
JP8/97970 | 1996-04-19 |
Publications (1)
Publication Number | Publication Date |
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WO1997039868A1 true WO1997039868A1 (fr) | 1997-10-30 |
Family
ID=14206537
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/001239 WO1997039868A1 (fr) | 1996-04-19 | 1997-04-10 | Procede de recuperation de resine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6060527A (ja) |
EP (1) | EP0900639B1 (ja) |
DE (1) | DE69722932T2 (ja) |
ES (1) | ES2195129T3 (ja) |
WO (1) | WO1997039868A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPQ747100A0 (en) * | 2000-05-11 | 2000-06-08 | Geo2 Limited | Delamination process |
TW537954B (en) * | 2002-06-20 | 2003-06-21 | Far East College | Method for separating substrate and film material of optical recording medium by means of ultrasonic waves |
JP4103494B2 (ja) * | 2002-08-20 | 2008-06-18 | 富士ゼロックス株式会社 | 画像形成装置用部品の再生方法及び再生装置、並びに画像形成装置用の再生部品 |
JP2005205690A (ja) * | 2004-01-21 | 2005-08-04 | Orient Sokki Computer Kk | 光ディスクのリサイクル方法、樹脂成形物、再生光ディスク |
WO2006070434A1 (ja) * | 2004-12-27 | 2006-07-06 | Orient Instrument Computer Co., Ltd. | データ記録媒体の廃棄処理方法 |
US7430925B2 (en) * | 2005-05-18 | 2008-10-07 | Pressure Profile Systems, Inc. | Hybrid tactile sensor |
EP2095925A1 (en) * | 2008-02-28 | 2009-09-02 | Optical Media Group S.P.A. | Process for recycling polycarbonate supports and relative apparatus |
FR2929948B1 (fr) * | 2008-04-09 | 2010-09-24 | Toray Plastics Europ | Film plastique extrude charge en particules metalliques, procede d'obtention et utilisations dudit film |
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JPH05200379A (ja) * | 1991-10-15 | 1993-08-10 | Bayer Ag | ポリカーボネート、ポリエステルカーボネートおよびポリエステル廃棄物の精製 |
JPH05345321A (ja) * | 1992-06-16 | 1993-12-27 | Teijin Chem Ltd | 金属蒸着膜の剥離方法 |
WO1994001491A1 (fr) * | 1992-07-03 | 1994-01-20 | Helverep S.A. | Procede de valorisation de dechets d'une matiere synthetique contamines par d'autres materiaux |
JPH0663942A (ja) * | 1992-08-19 | 1994-03-08 | Teijin Chem Ltd | 樹脂の回収方法 |
WO1994006608A1 (de) * | 1991-07-12 | 1994-03-31 | Georg Witt | Verfahren und vorrichtung zum mechanischen entfernen einer schicht auf dem basismaterial eines plattenförmigen informationsträgers |
JPH07205154A (ja) * | 1994-01-19 | 1995-08-08 | Teijin Ltd | 光学式ディスクの処理方法 |
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JPH07286064A (ja) * | 1994-04-20 | 1995-10-31 | Teijin Eng Kk | 光学式ディスク廃棄物の処理方法 |
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DE4039024A1 (de) * | 1990-09-21 | 1992-03-26 | Bayer Ag | Reinigung von polycarbonat- und polyestercarbonat-abfaellen |
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JP3232705B2 (ja) * | 1991-12-05 | 2001-11-26 | ソニー株式会社 | 光学記録ディスクからの樹脂材料の再生方法 |
US5220754A (en) * | 1992-03-02 | 1993-06-22 | Amad Tayebi | Recovered compact disk and a method and an apparatus for recovery thereof |
US5306349A (en) * | 1992-11-23 | 1994-04-26 | Sony Music Entertainment, Inc. | Method for removing coatings from compact discs |
DE4306348A1 (de) * | 1993-02-23 | 1994-08-25 | Spittel Michael | Verfahren zum Abtrennen von Aluminium-Schichten und allen eventuell darüberliegenden Material-Schichten von darunterliegenden Kunststoffen, die keine Folien darstellen |
WO1996012598A1 (fr) * | 1994-10-20 | 1996-05-02 | Teijin Chemicals, Ltd. | Procede de recuperation de resine |
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DE19531886A1 (de) * | 1995-08-30 | 1997-03-06 | Basf Magnetics Gmbh | Kontinuierlich ablaufendes Verfahren zur Wiedergewinnung von Rohmaterialien aus beschichteten Folien |
-
1997
- 1997-04-10 WO PCT/JP1997/001239 patent/WO1997039868A1/ja active IP Right Grant
- 1997-04-10 US US09/171,231 patent/US6060527A/en not_active Expired - Lifetime
- 1997-04-10 ES ES97915702T patent/ES2195129T3/es not_active Expired - Lifetime
- 1997-04-10 EP EP19970915702 patent/EP0900639B1/en not_active Expired - Lifetime
- 1997-04-10 DE DE1997622932 patent/DE69722932T2/de not_active Expired - Lifetime
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WO1994006608A1 (de) * | 1991-07-12 | 1994-03-31 | Georg Witt | Verfahren und vorrichtung zum mechanischen entfernen einer schicht auf dem basismaterial eines plattenförmigen informationsträgers |
JPH05200379A (ja) * | 1991-10-15 | 1993-08-10 | Bayer Ag | ポリカーボネート、ポリエステルカーボネートおよびポリエステル廃棄物の精製 |
JPH05345321A (ja) * | 1992-06-16 | 1993-12-27 | Teijin Chem Ltd | 金属蒸着膜の剥離方法 |
WO1994001491A1 (fr) * | 1992-07-03 | 1994-01-20 | Helverep S.A. | Procede de valorisation de dechets d'une matiere synthetique contamines par d'autres materiaux |
JPH0663942A (ja) * | 1992-08-19 | 1994-03-08 | Teijin Chem Ltd | 樹脂の回収方法 |
JPH07205154A (ja) * | 1994-01-19 | 1995-08-08 | Teijin Ltd | 光学式ディスクの処理方法 |
JPH07256639A (ja) * | 1994-03-23 | 1995-10-09 | Teijin Ltd | 光磁気記録ディスク廃棄物の処理方法 |
JPH07286064A (ja) * | 1994-04-20 | 1995-10-31 | Teijin Eng Kk | 光学式ディスク廃棄物の処理方法 |
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Also Published As
Publication number | Publication date |
---|---|
EP0900639A4 (en) | 2000-07-05 |
DE69722932T2 (de) | 2004-05-13 |
ES2195129T3 (es) | 2003-12-01 |
US6060527A (en) | 2000-05-09 |
EP0900639A1 (en) | 1999-03-10 |
DE69722932D1 (de) | 2003-07-24 |
EP0900639B1 (en) | 2003-06-18 |
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