WO2011132665A1 - ハードディスク用アルミノシリケートガラス基板の製造方法 - Google Patents
ハードディスク用アルミノシリケートガラス基板の製造方法 Download PDFInfo
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- WO2011132665A1 WO2011132665A1 PCT/JP2011/059605 JP2011059605W WO2011132665A1 WO 2011132665 A1 WO2011132665 A1 WO 2011132665A1 JP 2011059605 W JP2011059605 W JP 2011059605W WO 2011132665 A1 WO2011132665 A1 WO 2011132665A1
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- polishing
- aluminosilicate glass
- glass substrate
- polymer
- sulfonic acid
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/8404—Processes or apparatus specially adapted for manufacturing record carriers manufacturing base layers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
Definitions
- the present invention relates to a method for producing an aluminosilicate glass substrate for a hard disk and a method for reducing surface waviness of an aluminosilicate glass substrate for a hard disk.
- Patent Document 1 An acidic polishing composition for glass substrates has been proposed (Patent Document 1).
- the polishing composition includes an abrasive such as colloidal silica and a water-soluble polymer in which at least one of a carboxylic acid group, a salt of a carboxylic acid group, a sulfonic acid group, and a sulfonic acid group salt is bonded to the main chain.
- an abrasive such as colloidal silica and a water-soluble polymer in which at least one of a carboxylic acid group, a salt of a carboxylic acid group, a sulfonic acid group, and a sulfonic acid group salt is bonded to the main chain.
- the polishing liquid composition which can suppress roll-off is also proposed (patent document 2).
- the present invention reduces the surface waviness of the aluminosilicate glass substrate for hard disk and the method of manufacturing the aluminosilicate glass substrate for hard disk, which can realize the reduction of waviness of the substrate surface after polishing for the substrate to be polished containing aluminosilicate. Provide a method.
- the method for producing an aluminosilicate glass substrate for a hard disk of the present invention comprises silica particles, a polymer having a sulfonic acid group, and water, and the adsorption constant of the polymer having a sulfonic acid group to the aluminosilicate glass is 1.
- a step of polishing the aluminosilicate glass substrate to be polished with the polishing composition which is 5 to 5.0 L / g.
- the method for reducing the surface waviness of the aluminosilicate glass substrate for hard disk according to the present invention comprises silica particles, a polymer having a sulfonic acid group, and water, and the polymer having the sulfonic acid group is applied to the aluminosilicate glass.
- the present invention it is possible to provide a method for producing an aluminosilicate glass substrate for a hard disk capable of reducing the waviness of the substrate surface after polishing, and a method for reducing the surface waviness of the aluminosilicate glass substrate for hard disk.
- “undulation” refers to irregularities on the surface of a substrate having a wavelength longer than roughness, and generally, long wavelength waviness (wavelength 0.5 to 2 mm), short wavelength waviness (wavelength 50 to 160 ⁇ m), and medium wavelength waviness. (Wavelength 160 to 500 ⁇ m) is included, but in this specification, unless otherwise stated, it refers to medium wavelength waviness.
- Aluminosilicate glass substrate polishing liquid composition used in the method for manufacturing an aluminosilicate glass substrate for hard disks of the present invention (hereinafter also referred to as “the manufacturing method of the present invention”).
- the aluminosilicate glass substrate to be polished (hereinafter also referred to as “aluminosilicate glass substrate”, “glass substrate”, “substrate to be polished”, or “substrate”) is Si as a constituent element other than O. Is the most, followed by Al and Na. Usually, the Si content is 20 to 40% by weight, the Al content is 3 to 25% by weight, and the Na content is 3 to 25% by weight.
- the Al content is 3% by weight or more from the viewpoint of improving the adsorptivity of the polymer having a sulfonic acid group to the aluminosilicate glass substrate and improving the alkali resistance of the substrate. Is preferable, 5% by weight or more is more preferable, and 7% by weight or more is more preferable. Further, the content of Al is preferably 25% by weight or less, more preferably 20% by weight or less, and still more preferably 15% by weight or less from the viewpoint of maintaining the transparency of the substrate. Accordingly, the Al content is preferably 3 to 25% by weight, more preferably 5 to 20% by weight, and even more preferably 7 to 15% by weight.
- the Na content is preferably 3 to 25% by weight, more preferably 3 to 20% by weight, and more preferably 5 to 15% by weight. Is more preferable.
- the detail of the measurement conditions of content of Si, Al, and Na contained in an aluminosilicate glass substrate is as showing in an Example.
- Si and Al exist as oxides such as SiO 2 and Al 2 O 3 in the aluminosilicate glass substrate.
- the aluminosilicate glass substrate used in the production method of the present invention is composed of, for example, Na 2 O, K 2 O, B 2 O 3 , CaO, ZrO 2 and TiO 2 in addition to SiO 2 and Al 2 O 3.
- the polishing composition used in the production method of the present invention contains silica particles.
- the silica particles used in the polishing liquid composition include colloidal silica particles, fumed silica particles, and surface-modified silica particles. Colloidal silica particles are preferable from the viewpoint of reducing waviness. Moreover, as a usage form of a silica particle, it is preferable that it is a slurry form.
- Colloidal silica particles are made from an alkali metal silicate such as sodium silicate as a raw material, and a water glass method in which the raw material is subjected to a condensation reaction in an aqueous solution to grow particles, or an alkoxysilane such as tetraethoxysilane as a raw material. It can be obtained by an alkoxysilane method or the like in which particles are grown by condensation reaction in water containing a water-soluble organic solvent such as alcohol. Further, the fumed silica particles are obtained by a vapor phase method or the like in which a volatile silicon compound such as silicon tetrachloride is used as a raw material, and the raw material is hydrolyzed at a high temperature of 1000 ° C. or higher with an oxygen hydrogen burner to grow the particles. .
- the average particle diameter of the silica particles is preferably from 5 to 200 nm, more preferably from 7 to 100 nm, still more preferably from 10 to 80 nm, and even more preferably from the viewpoint of improving the polishing rate, reducing waviness, and improving the surface smoothness. ⁇ 50 nm.
- the average particle size was determined by observing the sample with a transmission electron microscope (TEM) trade name “JEM-2000FX” (80 kV, 1 to 50,000 times, manufactured by JEOL Ltd.) according to the instructions attached by the manufacturer. Take a picture of the image, import the photograph into a computer as image data with a scanner, and use the analysis software “WinROOFOver.3.6” (distributor: Mitani) to determine the equivalent circle diameter of each silica particle. Can be obtained by calculating the average value after obtaining the particle diameter of 1000 or more silica particles.
- TEM transmission electron microscope
- the area of a circle whose diameter is the maximum diameter of the silica particles obtained by measurement by observation with a transmission electron microscope (TEM) is divided by the projected area of the silica particles.
- the average value of values multiplied by 100 is preferably a value within the range of 100 to 140, and is a value within the range of 100 to 135. Is more preferable, and a value within the range of 100 to 130 is even more preferable.
- the area of a circle whose circumference is the circumference of the silica particles obtained by measurement by observation with a transmission electron microscope (TEM) is divided by the projected area of the silica particles.
- the average value of values multiplied by 100 is preferably a value in the range of 100 to 130, and is a value in the range of 100 to 125. More preferably, the value is in the range of 100 to 120, more preferably in the range of 100 to 115, still more preferably in the range of 100 to 110. preferable.
- SF2 represents that the surface is a smooth shape, so that it is close to 100.
- SF1 is, for example, observed with a transmission electron microscope “JEM-2000FX” (80 kV, 1 to 50,000 times) manufactured by JEOL according to the instructions attached by the manufacturer of the microscope, and a TEM image is taken.
- JEM-2000FX 80 kV, 1 to 50,000 times
- SF2 can be calculated from the circumference of one particle and the projected area obtained by the same method.
- the content of the silica particles in the polishing liquid composition is preferably 1 to 20% by weight, more preferably 2 to 19% by weight in the polishing liquid composition from the viewpoint of improving the polishing rate and reducing the surface roughness. More preferably, it is 3 to 18% by weight, and still more preferably 5 to 16% by weight.
- the polishing composition contains a polymer having a sulfonic acid group and having an adsorption constant of 1.5 to 5.0 L / g with respect to the aluminosilicate glass.
- a polymer having a sulfonic acid group (hereinafter sometimes referred to as “polymer”) has a reduction in waviness and high surface flatness when the polishing composition is used for polishing an aluminosilicate glass substrate. This contributes to the formation of the surface.
- use of a polymer includes use of a polymer and / or its salt.
- the reason why the swell is reduced is estimated as follows.
- the polymer having a sulfonic acid group has a negative charge because it dissociates in the polishing composition.
- Al 2 O 3 contained in the aluminosilicate glass substrate has a positive charge. Therefore, the polymer having a sulfonic acid group is formed on the surface of the aluminosilicate glass substrate via the sulfonic acid group (particularly, the portion having a component having a positive charge in an acidic solution such as an Al 2 O 3 portion on the substrate surface). To form a film.
- the coating is difficult to break in both the convex portion and the concave portion, and it is difficult to polish both the convex portion and the concave portion.
- the surface is difficult to flatten.
- This adsorption strength can be expressed using the adsorption constant.
- the adsorption constant of the polymer having a sulfonic acid group with respect to the aluminosilicate glass is 1.5 to 5.0 L / g. Since it is formed of a polymer having a sulfonic acid group, it is possible to obtain a surface with excellent flatness by reducing the undulation of the substrate surface.
- these assumptions do not limit the present invention.
- the adsorption constant of the polymer having a sulfonic acid group to the aluminosilicate glass is measured by the measurement method described in the examples, and is calculated by the following formula (1).
- K is the adsorption constant
- A is the adsorption amount with respect to the aluminosilicate glass of the polymer
- a m is the saturation adsorption amount for the aluminosilicate glass of the polymer
- c is the unadsorbed the aluminosilicate glass Weight The concentration of coalescence.
- the details of the measurement conditions of the measurement test of the adsorption constant of the polymer on the aluminosilicate glass are as shown in the Examples.
- the above equation (1) is derived from the Langmuir adsorption isotherm.
- the polymer having a sulfonic acid group which will be described later, has a stable dissociation state even at an acidic pH, and is a Langmuir type adsorption (aluminum (Al 2 O 3 ) site, etc.) contained in an aluminosilicate glass substrate and having a positive charge. Monomolecular layer adsorption).
- the adsorption constant is preferably 1.5 to 4.0 L / g, more preferably 1.6 to 3.5 L / g, and more preferably 1.6 to 3.3 L / g from the viewpoint of further reducing the waviness of the substrate surface. More preferably, 1.8 to 3.0 L / g is even more preferable, 1.8 to 2.5 L / g is even more preferable, and 1.8 to 2.4 L / g is even more preferable.
- the polymer having a sulfonic acid group used in the present invention is not particularly limited as long as its adsorption coefficient is 1.5 to 5.0 L / g, but can be adsorbed to an aluminosilicate glass substrate with a more appropriate strength.
- a polymer having an aromatic ring such as a benzene ring or a naphthalene ring is preferable, and a polymer having a naphthalene ring is more preferable.
- a ⁇ - ⁇ interaction occurs between the polymers adsorbed on the aluminosilicate glass substrate, and the polymer is stabilized in an overlapping arrangement to form a film having a more appropriate strength. It is estimated to be.
- the weight average molecular weight of the polymer having a sulfonic acid group is preferably from 3000 to 100,000, more preferably from 3200 to 50000, still more preferably from 3300 to 30000, because it can be adsorbed to the aluminosilicate glass substrate with an appropriate strength. Even more preferred is ⁇ 20,000.
- the weight average molecular weight is a value measured by GPC (gel permeation chromatography), and details of the measurement conditions are as shown in the examples.
- Examples of the monomer having a sulfonic acid group include monomers having an aromatic ring such as a benzene ring and a naphthalene ring such as styrene sulfonic acid and naphthalene sulfonic acid, isoprene sulfonic acid, and (meth) acrylamide-2-methyl.
- Examples include propane sulfonic acid, methallyl sulfonic acid, vinyl sulfonic acid, allyl sulfonic acid, and isoamylene sulfonic acid.
- monomers having an aromatic ring such as a benzene ring and a naphthalene ring such as styrene sulfonic acid and naphthalene sulfonic acid are preferable because they can be adsorbed to an aluminosilicate glass substrate with an appropriate strength.
- Styrene sulfonic acid and naphthalene Sulfonic acid is more preferred, and naphthalene sulfonic acid is even more preferred.
- These monomers having a sulfonic acid group may be used alone or in combination of two or more.
- the polymer having a sulfonic acid group may be a homopolymer of a monomer component having a sulfonic acid group, or may be a copolymer with a monomer component composed of another monomer.
- a hydrophobic monomer is preferable from the viewpoint of improving the adsorptivity to the aluminosilicate glass substrate.
- the hydrophobic monomer means a monomer having a solubility of 2 g or less with respect to 100 g of water at 20 ° C.
- the solubility of the hydrophobic monomer in 100 g of water at 20 ° C. is preferably 0 to 1 g, more preferably 0 to 0.1 g, from the viewpoint of improving the adsorptivity to the aluminosilicate glass substrate.
- hydrophobic monomers include alkyl acrylate monomers, alkyl methacrylate monomers, polyalkylene glycol acrylate monomers excluding polyethylene glycol acrylate monomers, polyalkylene glycol methacrylate monomers excluding polyethylene glycol methacrylate monomers, and styrene.
- Preferable examples include a monomer, an alkylacrylamide monomer, and an alkylmethacrylamide monomer.
- alkyl acrylate monomers alkyl methacrylate monomers, and styrene monomers are preferable, and styrene monomers are more preferable because a polymer having a sulfonic acid group with an appropriate strength can be adsorbed on the aluminosilicate glass substrate.
- hydrophobic monomers may be used alone or in combination of two or more.
- alkyl acrylate monomers and alkyl methacrylate monomers include methyl methacrylate, ethyl methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate, ethyl hexyl methacrylate, decyl methacrylate, lauryl methacrylate (LMA), palmityl methacrylate.
- Styrene monomers include styrene, ⁇ -methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, ⁇ , 2-dimethylstyrene, 2,4-dimethylstyrene, 2,5-dimethylstyrene, 2 , 4,6-trimethylstyrene, 2-ethylstyrene, 4-ethylstyrene, 4-isopropylstyrene, 2-methoxystyrene, 3-methoxystyrene, 4-methoxystyrene, 4-ethoxystyrene, 4-phenoxystyrene, 4- Examples thereof include phenylstyrene, 2-hydroxystyrene, 4-hydroxystyrene, and among these, styrene is preferable because a polymer having a sulfonic acid group with an appropriate strength can be adsorbed on the alum
- the proportion of the monomer having a sulfonic acid group in the monomer corresponding to the structural unit constituting the copolymer is 10 mol% or more from the viewpoint of forming a film having an appropriate adsorption strength on the aluminosilicate glass substrate. Is preferable, and 20 mol% or more is still more preferable.
- the polymer having a sulfonic acid group is preferably in a form easily soluble in water from the viewpoint of improving workability at the time of blending, for example, a salt.
- a salt examples include alkali metal salts such as sodium and potassium, and ammonium salts such as ammonium and alkylammonium, but alkali metal salts such as sodium and potassium are preferable, and sodium salts are more preferable.
- polymer having a sulfonic acid group examples include, for example, ⁇ -naphthalenesulfonic acid formalin condensate, butylnaphthalenesulfonic acid-naphthalenesulfonic acid formalin cocondensate, styrene-styrenesulfonic acid copolymer, polystyrenesulfonic acid, Polynaphthalenesulfonic acid, polybutylnaphthalenesulfonic acid, polyhydroxynaphthalenesulfonic acid, polymethylnaphthalenesulfonic acid, polyethylnaphthalenesulfonic acid, polyisoprenesulfonic acid, poly (meth) acrylamide-2-methylpropanesulfonic acid, polymethallyl Examples thereof include sulfonic acid, polyvinyl sulfonic acid, polyallyl sulfonic acid, polyisoamylene sulfonic acid, and salts
- a polymer having a sulfonic acid group with moderate strength is absorbed into the aluminosilicate glass substrate.
- a polymer having an aromatic ring such as a benzene ring or a naphthalene ring is preferable, and a ⁇ -naphthalenesulfonic acid formalin condensate, a butylnaphthalenesulfonic acid-naphthalenesulfonic acid formalin cocondensate, polystyrenesulfonic acid, styrene
- One or more polymers selected from the group consisting of phthalenesulfonic acid, polyhydroxynaphthalenesulfonic acid, polymethylnaphthalenesulfonic acid, polyethylnaphthalenesulfonic acid, and salts thereof are more preferable. More preferred is one or more polymers selected from the group consisting of a polymer, ⁇ -naphthalenesulfonic acid formalin condensate, butylnaphthalenesulfonic acid-naphthalenesulfonic acid formalin cocondensate and salts thereof, ⁇ -naphthalenesulfonic acid Formalin condensates and salts thereof are more preferred.
- the polymer having a sulfonic acid group is obtained by, for example, converting a base polymer containing a diene structure or an aromatic structure into a known method, for example, Edited by Chemical Society of Japan, New Experimental Chemistry Course 14 (Synthesis and Reaction of Organic Compounds III 1773, 1978) and the like.
- the adsorption rate of the polymer having a sulfonic acid group to the silica particle surface described later is preferably 0 to 20%, more preferably 0 to 10%, and still more preferably 0 to 5% from the viewpoint of effectively reducing undulation. 0 to 1% is even more preferable, 0 to 0.5% is still more preferable, and 0% is even more preferable. That is, it is preferable that the polymer having a sulfonic acid group does not substantially act on the silica particles and is exclusively adsorbed on the surface to be polished to form a film.
- the adsorption rate indicates the ratio of the amount of the polymer having sulfonic acid groups adsorbed on the silica particles to the amount of the polymer having sulfonic acid groups added. The details of the measurement conditions are as shown in the examples.
- the content of the polymer having a sulfonic acid group in the polishing liquid composition is preferably 0.0001% by weight or more, more preferably 0.0005% by weight or more, from the viewpoint of effectively reducing waviness, and 0.001 % By weight or more is more preferable, and 0.005% by weight or more is more preferable.
- the content of the polymer having a sulfonic acid group is preferably 5% by weight or less, more preferably 4% by weight or less, still more preferably 3% by weight or less, from the viewpoint of improving the productivity of the substrate. Is more preferable, 0.2% by weight or less is further more preferable, and 0.05% by weight or less is even more preferable.
- the content of the polymer having a sulfonic acid group in the polishing liquid composition is preferably 0.0001 to 5% by weight, more preferably 0.0005 to 4% by weight, and further 0.001 to 3% by weight.
- 0.005 to 1% by weight is even more preferred, 0.005 to 0.2% by weight is even more preferred, and 0.005 to 0.05% by weight is even more preferred.
- the water in the polishing composition is used as a medium, and distilled water, ion exchange water, pure water, ultrapure water, or the like can be used.
- the water content in the polishing liquid composition is preferably 55% by weight or more, more preferably 70% by weight or more, even more preferably 80% by weight or more, because handling of the polishing liquid composition becomes easier. Preferably it is 85 weight% or more.
- the water content is preferably 99% by weight or less, more preferably 98% by weight or less, and still more preferably 97% by weight or less, from the viewpoint of improving the polishing rate. Therefore, the water content in the polishing composition is preferably 55 to 99% by weight, more preferably 70 to 98% by weight, still more preferably 80 to 97% by weight, and still more preferably 85 to 97% by weight. is there.
- the pH of the polishing composition is preferably 0.8 or more, more preferably 1.0 because the aluminosilicate glass substrate can be easily cleaned, corrosion of the processing machine can be prevented, and the operator can work more safely. More preferably, it is 1.2 or more. Further, from the viewpoint of improving the polishing rate and reducing waviness, it is preferably 5 or less, more preferably 4.5 or less, further preferably 4.0 or less, and even more preferably 3.5 or less. Accordingly, the pH of the polishing composition is preferably 0.8 to 5, more preferably 1.0 to 4.5, still more preferably 1.2 to 4.0, and still more preferably 1.2 to 3. 5.
- the pH of the polishing composition can be adjusted by, for example, the acid content.
- an acid includes the use of an acid and / or a salt thereof.
- Such acids include inorganic acids and organic acids.
- the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, polyphosphoric acid, amidosulfuric acid and the like.
- the organic acid include carboxylic acid, organic phosphoric acid, amino acid, and the like.
- carboxylic acid is monovalent carboxylic acid such as acetic acid, glycolic acid, ascorbic acid, gluconic acid, oxalic acid, tartaric acid, maleic acid, malic acid.
- trivalent carboxylic acids such as citric acid.
- organic phosphoric acid examples include 2-aminoethylphosphonic acid, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), aminotri (methylene) Phosphonic acid), ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid) and the like.
- amino acids include glycine and alanine.
- inorganic acid, carboxylic acid, and organic phosphoric acid are preferable from the viewpoint of reducing swell, and examples thereof include hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, polyphosphoric acid, glycolic acid, succinic acid, citric acid, HEDP, aminotri (methylenephosphone). Acid), ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid) are suitable. These acids for adjusting the pH may be used singly or in combination of two or more. From the viewpoint of improving the polishing rate, an inorganic acid and an organic phosphoric acid are mixed.
- the content of the acid in the polishing composition is preferably 0.05% by weight or more, more preferably 0.1% by weight or more, and still more preferably 0.2% by weight or more from the viewpoint of improving the polishing rate.
- the acid content is preferably 10% by weight or less, more preferably 7.5% by weight or less, and still more preferably 5% by weight or less in order to suppress corrosion of the polishing apparatus. Accordingly, the acid content is preferably 0.05 to 10% by weight, more preferably 0.1 to 7.5% by weight, and still more preferably 0.2 to 5% by weight.
- the polishing composition may further contain a bactericidal agent, an antibacterial agent, a thickener, a dispersant, a rust inhibitor, and the like.
- the content of these components in the polishing liquid composition is preferably 5% by weight or less, more preferably 3% by weight or less, and still more preferably 1% by weight or less from the viewpoint of polishing characteristics.
- the polishing composition can be prepared by mixing each component by a known method.
- the polishing composition is usually produced as a concentrated solution from the viewpoint of economy, and it is often diluted at the time of use.
- the polishing composition may be used as it is, or diluted if it is a concentrated solution.
- the dilution ratio is not particularly limited, and can be appropriately determined according to the concentration of each component in the concentrate (abrasive content, etc.), polishing conditions, and the like.
- the pH of the polishing composition may be adjusted to a predetermined pH after mixing the components, or before mixing the components so that the pH of the polishing composition becomes a desired value by mixing the components.
- the pH of each of the components may be adjusted.
- the pH can be adjusted with the acid or the like and / or a pH adjusting agent.
- the manufacturing method of the aluminosilicate glass substrate for hard disks of this invention includes the process of grind
- the aluminosilicate glass substrate for hard disks is, for example, from a process of obtaining an aluminosilicate glass substrate by a method of cutting out from a mold press or sheet glass of molten glass, a rough grinding process, a fine grinding process, a shape processing process, an end mirror processing process, It is manufactured through a polishing process, a chemical strengthening process, and the like. In some cases, a chemical strengthening step is performed before the polishing step. In addition, a cleaning process may be included between the processes. And the aluminosilicate glass substrate for hard disks becomes a magnetic disk through a recording part forming step in the method of manufacturing a magnetic disk.
- the recording part forming step includes, for example, a step of forming a seed layer, an underlayer, an intermediate layer, a magnetic layer, a protective layer, and a lubricating layer on an aluminosilicate glass substrate.
- alumina abrasive grains are used, in the shape processing step, a cylindrical grindstone is used, in the end mirror processing step, a brush is used, and in the fine grinding step, about # 1000 alumina abrasive grains are used.
- the polishing step is divided into, for example, a first polishing step and a second polishing step, and includes a first polishing step and a second polishing step in this order.
- final (finish) polishing is further performed for the purpose of improving surface quality
- a process is included.
- cerium oxide particles are suitably used as abrasive grains
- silica particles are suitably used as abrasive grains.
- the polishing composition is preferably used in the second polishing step and / or the final (finishing) polishing step.
- an alkaline cleaner, a neutral cleaner, or an acidic cleaner is used to dissolve and remove abrasive grains and polishing debris remaining on the aluminosilicate glass substrate surface.
- the production method of the present invention may include a washing step of washing the aluminosilicate glass substrate with pure water, IPA or the like, and a drying step of drying by IPA (vapor drying) or spin drying.
- a scrub treatment may be performed during the cleaning step.
- ⁇ Aluminosilicate glass substrates for hard disks are required to have a smooth surface that does not cause magnetic head read / write errors. That is, the substrate surface is required to have high flatness (roughness, waviness, etc.) and few defects (protrusions due to abrasive grains, etc., and recesses such as scratches and pits).
- the polishing process plays a role of improving the flatness of the substrate surface and removing defects. Therefore, in the polishing process, the second polishing process or the final (finish) polishing process is particularly important.
- the polishing liquid composition is supplied to the surface to be polished of the substrate to be polished, the polishing pad is brought into contact with the surface to be polished, and the polishing pad and the substrate to be polished are moved while applying a predetermined pressure (load).
- a predetermined pressure load
- polishing can be performed with a conventionally well-known grinding
- polishing method of aluminosilicate glass substrate There is no particular limitation on a polishing apparatus used in a method for polishing an aluminosilicate glass substrate which is a substrate to be polished using the polishing liquid composition (hereinafter also referred to as “polishing method”), and the substrate to be polished is held.
- a polishing apparatus including a jig (carrier: aramid, etc.) and a polishing cloth (polishing pad) can be used. Among these, a double-side polishing apparatus is preferably used.
- the material of the polishing pad includes organic polymers, and examples of the organic polymer include polyurethane.
- the shape of the polishing pad is preferably a nonwoven fabric.
- a suede-like urethane hard pad is suitably used in the first polishing step
- a suede-like urethane soft pad is suitably used in the second polishing step and the final polishing step.
- a polishing substrate is sandwiched between a pair of polishing plates that are held by a carrier and a polishing pad is affixed, and the polishing liquid composition is placed between the polishing pad and the polishing substrate.
- polishing method in which the substrate to be polished is polished while being brought into contact with the substrate to be polished by moving the polishing platen and / or the substrate to be polished under a predetermined pressure.
- the polishing method includes a step of causing the polishing composition to exist between a polishing pad and a substrate to be polished and polishing with a predetermined polishing load.
- “Polishing load” means a pressure applied to a surface to be polished of a substrate to be polished from a surface plate that sandwiches the substrate to be polished during polishing.
- the polishing load can be easily adjusted with a normal polishing apparatus. For example, the polishing load can be adjusted by applying air pressure or weight to a surface plate or a substrate to be polished.
- the polishing load is preferably 3 kPa or more, 4 kPa or more, more preferably 5 kPa or more, and even more preferably 6 kPa or more from the viewpoint of improving the polishing rate and efficiently reducing waviness to obtain a highly smooth surface. From the viewpoint of reducing waviness and obtaining a highly smooth surface, it is preferably 40 kPa or less, 30 kPa or less, more preferably 20 kPa or less, and even more preferably 15 kPa or less.
- the polishing load can be adjusted by adjusting the air pressure or weight load on the surface plate or the substrate.
- the polishing method is preferably used after the second polishing step in the polishing step, and more preferably used in the final (finish) polishing step.
- the method for supplying the polishing liquid composition is a method in which the constituents of the polishing liquid composition are sufficiently mixed in advance with a pump or the like between the polishing pad and the glass substrate, and the constituents are mixed in the supply line. And a method of supplying a slurry of silica particles and an aqueous solution in which a polymer having a sulfonic acid group is separately supplied to a polishing apparatus can be used.
- the supply rate of the polishing composition is preferably 1.0 mL / min or less per 1 cm 2 of the substrate to be polished, more preferably 0.6 mL / min or less, and even more preferably 0.4 mL / min or less from the viewpoint of cost reduction. is there.
- the supply rate is preferably 0.01 mL / min or more, more preferably 0.025 mL / min or more, and further preferably 0.05 mL / min or more per 1 cm 2 of the glass substrate because the polishing rate can be further improved. .
- the supply rate is preferably 0.01 to 1.0 mL / min per 1 cm 2 of the glass substrate, more preferably 0.025 to 0.6 mL / min, and still more preferably 0.05 to 0.4 mL / min. is there.
- the polishing composition can also be used in cyclic polishing in which the used polishing composition is reused. Since the polishing liquid composition is excellent in circulation durability, it is preferably used with a polishing apparatus having a mechanism for circulating and reusing the polishing liquid composition, and a polishing apparatus having a mechanism for circulating and reusing the polishing liquid composition In addition, it is more preferable to be used in the second polishing step and / or the final (finish) polishing step. During the cyclic polishing, compounds such as acids and additives consumed by polishing may be added as appropriate.
- the supply rate of the polishing composition is preferably 0.1 mL / min or more per 1 cm 2 of the substrate to be polished, more preferably 0.2 mL / min. Min or more, more preferably 0.5 mL / min or more.
- the upper limit of the supply rate is not particularly limited, but from the viewpoint of cost reduction, it is preferably 3.0 mL / min or less per 1 cm 2 of the substrate to be polished, more preferably 2.5 mL / min or less, and further preferably 2.0 mL. / Min or less. Therefore, 0.1 to 3.0 mL / min per 1 cm 2 of the substrate to be polished is preferable, more preferably 0.2 to 2.5 mL / min, and further preferably 0.5 to 2.0 mL / min.
- the surface of the aluminosilicate glass substrate can be reduced by reducing the waviness of the glass substrate to obtain a highly smooth surface. If it is used for the manufacturing method of the aluminosilicate glass substrate for hard disks, the waviness can be effectively reduced in the polishing process of the aluminosilicate glass substrate.
- Example 1 to 4 and Comparative Examples 1 to 12 1.
- Table 2 shows the details of the substrate to be polished.
- Wa (arithmetic mean waviness) of medium wavelength (160 to 500 ⁇ m) is a value measured by New View 5032 (manufactured by Zygo).
- Aluminosilicate glass substrate An aluminosilicate glass substrate coarsely polished in advance with a polishing composition containing ceria abrasive grains was prepared as a substrate to be polished.
- the content of Al contained in the substrate was 8.6% by weight, the content of Si was 27.1% by weight, and the content of Na was 6.0% by weight.
- Measurement equipment PHI Quantera SXM manufactured by ULVAC-PHI X-ray source: Monochromatic AlK ⁇ ray, 1486.6 eV, 25 W, 15 kV Beam diameter: 100 ⁇ m X-ray incident angle: 45 ° Measurement range: 500 ⁇ 500 ⁇ m 2 Pass energy: 280.0 (survey), 140.0 eV (narrow) Step size: 1.00 (survey), 0.250 eV (narrow) Measurement elements: C, N, O, Na, Mg, Al, Si, S, K, Ti, Zr, Nb Charging correction: Neutralizer and Ar + irradiation
- Ni—P-plated aluminum alloy substrate A Ni—P-plated aluminum alloy substrate that had been coarsely polished in advance with a polishing composition containing an alumina abrasive was prepared as a substrate to be polished.
- Silicate glass substrate A silicate glass substrate composed of pure SiO 2 to which Al 2 O 3 or the like was not added was prepared as a substrate to be polished.
- polishing Liquid Composition For Examples 1, 2, 4 and Comparative Examples 1-12, after adding sulfuric acid and HEDP to ion-exchanged water, the following polymers (1) to (11) were prepared. Further, colloidal silica particles (average particle diameter: 25 nm, SF1 (average value): 123, SF2 (average value): 109) are added as silica particles, and the pH is adjusted to 1.5 to obtain a polishing composition. I got a thing. The amount of each component added is 0.35% by weight of sulfuric acid, 0.13% by weight of HEDP, 0.01% by weight of the polymers (1) to (11), based on the total weight of the polishing composition. Colloidal silica particles were adjusted to 9% by weight.
- Example 3 a polishing composition was obtained in the same manner as in Example 2 except that citric acid was added instead of sulfuric acid and HEDP and the pH was adjusted to 2.5.
- the amount of each component added is 1.5% by weight of citric acid, 0.01% by weight of the polymer (2) below, and 9% by weight of colloidal silica particles based on the total weight of the polishing composition. I made it.
- polymers (1) to (11) used are as follows. (1) ⁇ -naphthalenesulfonic acid formalin condensate sodium salt (manufactured by Kao Corporation) (2) Butylnaphthalenesulfonic acid-naphthalenesulfonic acid formalin cocondensate sodium salt (cocondensation molar ratio 20/80, manufactured by Kao Corporation) (3) Styrene-styrenesulfonic acid copolymer (cocondensation molar ratio 18/82, manufactured by Kao Corporation) (4) Acrylic acid-acrylamide-2-methylpropanesulfonic acid copolymer sodium salt (copolymerization molar ratio 89/11, manufactured by Toagosei Co., Ltd.) (5) ⁇ -Naphthalenesulfonic acid formalin condensate sodium salt (manufactured by Kao Corporation) (6) Polyvinylsulfonic acid sodium salt (manufactured by Aldrich) (7) Polystyls
- Adsorption constant of polymer to aluminosilicate glass, adsorption rate of polymer to silica particles (colloidal silica particles), weight average molecular weight of polymer, pH of polishing composition, average particle diameter of silica particles, silica particles SF1 and SF2 and waviness were measured as follows.
- Hydrochloric acid was added to 20 g (25 ° C.) of an aqueous solution obtained by adding the polymers (1) to (11) to ion-exchanged water so that the concentration was 0 to 5000 ppm, and the pH was adjusted to 1.5. It was adjusted.
- 0.5 g of aluminosilicate glass particles having a particle diameter of about 5 ⁇ m obtained by pulverizing an aluminosilicate glass substrate was added to this aqueous solution, stirred, and then stirred at 3500 rpm using a centrifuge (H-28F manufactured by Kokusan Co., Ltd.). Centrifuged for minutes.
- the aluminosilicate glass particles were allowed to settle, and the total carbon number concentration present in the supernatant was measured with a TOC-500 manufactured by Shimadzu Corporation.
- the polymer concentration c in the supernatant is calculated using the measured carbon concentration and a calibration curve prepared with the polymer at a known concentration, and the polymer adsorption amount A is subtracted from the charged concentration.
- the addition amount of the polymer and the adsorption amount A to the aluminosilicate glass particles were plotted on a graph, and the adsorption constant K at 25 ° C. was calculated using the following formula (1).
- ⁇ Measurement method of adsorption rate of polymer to silica particles Except for using colloidal silica particles in place of the aluminosilicate glass particles and setting the concentration of the polymers of (1) to (11) to 100 ppm, the silica particles are not coated on the silica particles according to the same method as that for measuring the adsorption constant. The concentration of the polymer for adsorption was calculated. The concentration of the unadsorbed polymer is subtracted from the charged concentration of 100 ppm, the concentration of the polymer adsorbed on the silica particles is calculated, and this value is divided by the charged concentration. Adsorption rate.
- ⁇ Measurement method of weight average molecular weight The polymers (1) to (11) were dissolved in chloroform, and the weight average molecular weight was measured using GPC (gel permeation chromatography) under the following conditions.
- ⁇ Measuring method of average particle diameter of silica particles A sample containing colloidal silica particles was observed with a transmission electron microscope “JEM-2000FX” (80 kV, 1 to 50,000 times, manufactured by JEOL Ltd.) according to the instructions attached by the manufacturer, and TEM (Transmission Electron Microscope). I photographed the statue. This photograph was taken into a personal computer as image data by a scanner, and the equivalent diameter of each silica particle was measured using analysis software “WinROOF ver. 3.6” (distributor: Mitani Corp.) to obtain the particle diameter. . Thus, after calculating
- ⁇ Method for measuring SF1 and SF2 of silica particles Take a TEM image of the sample containing colloidal silica particles by the same method as the above average particle diameter measurement method, take this photograph into a personal computer as image data, and use the same analysis software as above to One maximum diameter and projected area were measured, and SF1 was calculated. Thus, after calculating
- the substrates to be polished are an aluminosilicate glass substrate and a Ni—P plated aluminum alloy substrate
- four substrates are arbitrarily selected from ten substrates polished by the polishing method described below, and the four substrates are swelled under the following conditions.
- the average value of the measured values of the waviness for the four sheets was calculated as the medium wavelength waviness of the substrate.
- Table 1 The results are shown in Table 1 as relative values with the case where the polishing liquid compositions of Comparative Examples 1 and 9 were used as 100.
- the substrate to be polished was a silicate glass substrate
- the waviness was measured under the following conditions for one substrate polished by the polishing method described later.
- Polishing Method Polishing using the polishing composition of Examples 1 to 4 and Comparative Examples 1 to 12 was performed under the conditions of the following standard polishing test.
- Polishing conditions (1) Polishing conditions polishing test machine for aluminosilicate glass substrate: “Double-sided 9B polishing machine” manufactured by Speedfam Polishing pad: Suede type (thickness 0.9mm, average hole diameter 30 ⁇ m) Polishing liquid composition supply amount: 100 mL / min (supply rate per 1 cm 2 of substrate to be polished: about 0.3 mL / min) Lower platen rotation speed: 32.5 rpm Polishing load: 8.4 kPa Carrier: Aramid, thickness 0.45mm Polishing amount: Polishing with a polishing amount of 2.5 ⁇ m per side as a target Substrate to be polished: aluminosilicate glass substrate (outer diameter 65 mm, inner diameter 20 mm, thickness 0.635 mm, medium wavelength waviness value before polishing of 3.0 mm) Number of input substrates: 10
- Polishing condition polishing machine for Ni-P plated aluminum alloy substrate “Double-sided 9B polishing machine” manufactured by Speedfam Polishing pad: Suede type (thickness 0.9mm, average hole diameter 30 ⁇ m) Polishing liquid composition supply amount: 100 mL / min (supply rate per 1 cm 2 of substrate to be polished: about 0.14 mL / min) Lower platen rotation speed: 32.5 rpm Polishing load: 8.4 kPa Carrier: Aramid, thickness 1.0mm Polishing amount: Polishing with a polishing amount of 2.5 ⁇ m per side as the target Substrate to be polished: Ni—P plated aluminum alloy substrate (outer diameter 95 mm, inner diameter 25 mm, thickness 1.27 mm, medium wave waviness value before polishing 2.
- the present invention is useful in the production of an aluminosilicate glass substrate, and is particularly useful in the production of an aluminosilicate glass substrate for a hard disk.
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Abstract
Description
本発明の製造方法で使用される研磨液組成物は、シリカ粒子を含有する。前記研磨液組成物で使用されるシリカ粒子は、コロイダルシリカ粒子、ヒュームドシリカ粒子、表面修飾したシリカ粒子等が挙げられるが、うねり低減の観点から、コロイダルシリカ粒子が好ましい。また、シリカ粒子の使用形態としては、スラリー状であるのが好ましい。
前記研磨液組成物は、スルホン酸基を有し、アルミノシリケートガラスに対する上記吸着定数が1.5~5.0L/gの重合体を含む。スルホン酸基を有する重合体(以下、「重合体」と称する場合もある。)は、前記研磨液組成物をアルミノシリケートガラス基板の研磨に用いたとき、うねりの低減と、高い表面平坦性を有する表面の形成に寄与する。なお、本明細書において、重合体の使用は、重合体及び/又はその塩の使用を含む。
研磨液組成物中の水は、媒体として使用されるものであり、蒸留水、イオン交換水、純水及び超純水等が使用され得る。前記研磨液組成物中の水の含有量は、研磨液組成物の取扱いがさらに容易になるため、55重量%以上が好ましく、より好ましくは70重量%以上、さらに好ましくは80重量%以上、特に好ましくは85重量%以上である。また、前記水の含有量は、研磨速度向上の観点から、99重量%以下が好ましく、より好ましくは98重量%以下、さらに好ましくは97重量%以下である。したがって、研磨液組成物中の水の含有量は、55~99重量%が好ましく、より好ましくは70~98重量%、さらに好ましくは80~97重量%、より一層好ましくは85~97重量%である。
前記研磨液組成物のpHは、アルミノシリケートガラス基板の洗浄が容易で、加工機械の腐食が防止でき、作業者がより安全に作業できることから、0.8以上が好ましく、より好ましくは1.0以上、さらに好ましくは1.2以上である。また、研磨速度向上及びうねり低減の観点から、5以下が好ましく、より好ましくは4.5以下、さらに好ましくは4.0以下、さらにより好ましくは3.5以下である。したがって、研磨液組成物のpHは、0.8~5が好ましく、より好ましくは1.0~4.5、さらに好ましくは1.2~4.0、さらにより好ましくは1.2~3.5である。
前記研磨液組成物のpHは、例えば酸の含有量によって調整することができる。本明細書において、酸の使用は、酸及び/又はその塩の使用を含む。かかる酸としては無機酸や有機酸が挙げられる。無機酸としては、塩酸、硝酸、硫酸、リン酸、ポリリン酸、アミド硫酸等が挙げられる。有機酸としては、カルボン酸、有機リン酸、アミノ酸等が挙げられ、例えば、カルボン酸は、酢酸、グリコール酸、アスコルビン酸、グルコン酸等の一価カルボン酸、蓚酸、酒石酸、マレイン酸、リンゴ酸等の二価カルボン酸、クエン酸等の三価カルボン酸が挙げられ、有機リン酸としては、2-アミノエチルホスホン酸、1-ヒドロキシエチリデン-1,1-ジホスホン酸(HEDP)、アミノトリ(メチレンホスホン酸)、エチレンジアミンテトラ(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチレンホスホン酸)等が挙げられる。また、アミノ酸としては、グリシン、アラニン等が挙げられる。これらの中でも、うねり低減の観点から、無機酸、カルボン酸及び有機リン酸が好ましく、例えば、塩酸、硝酸、硫酸、リン酸、ポリリン酸、グリコール酸、蓚酸、クエン酸、HEDP、アミノトリ(メチレンホスホン酸)、エチレンジアミンテトラ(メチレンホスホン酸)、ジエチレントリアミンペンタ(メチレンホスホン酸)が適している。これらのpHを調整するための酸は、1種単独で使用しても、あるいは2種以上を混合して用いてもよいが、研磨速度向上の観点からは、無機酸と有機リン酸を混合して用いることが好ましく、研磨液pHの安定性向上の観点、及び循環研磨において高い研磨速度を維持できるという観点から、カルボン酸と有機リン酸を混合して用いることや二価又は三価カルボン酸を用いることが好ましく、三価カルボン酸を用いることがより好ましく、クエン酸を用いることがさらに好ましい。
前記研磨液組成物は、さらに、殺菌剤、抗菌剤、増粘剤、分散剤、防錆剤等を含んでもよい。これらの成分の研磨液組成物中の含有量は、研磨特性の観点から、5重量%以下が好ましく、より好ましくは3重量%以下、さらに好ましくは1重量%以下である。
前記研磨液組成物は、各成分を公知の方法で混合することにより、調製することができる。研磨液組成物は、経済性の観点から、通常、濃縮液として製造され、これを使用時に希釈する場合が多い。前記研磨液組成物は、そのまま使用してもよいし、濃縮液であれば希釈して使用すればよい。濃縮液を希釈する場合、その希釈倍率は、特に制限されず、前記濃縮液における各成分の濃度(研磨材の含有量等)や研磨条件等に応じて適宜決定できる。
本発明のハードディスク用アルミノシリケートガラス基板の製造方法は、前記研磨液組成物を用いて被研磨アルミノシリケートガラス基板を研磨する工程を含む。
前記研磨液組成物を用いて被研磨基板であるアルミノシリケートガラス基板を研磨する方法(以下、「研磨方法」ともいう。)で用いる研磨装置としては、特に制限はなく、被研磨基板を保持する冶具(キャリア:アラミド製等)と研磨布(研磨パッド)とを備える研磨装置を用いることができる。中でも、両面研磨装置が好適に用いられる。
1.被研磨基板の調整
被研磨基板の詳細を、表2に示す。中波長(160~500μm)のWa(算術平均うねり)はNew View 5032(Zygo社製)により測定した値である。
(1)アルミノシリケートガラス基板
セリア砥粒を含有する研磨液組成物であらかじめ粗研磨したアルミノシリケートガラス基板を被研磨基板として用意した。基板中に含まれるAlの含有量は8.6重量%であり、Siの含有量は27.1重量%、Naの含有量は6.0重量%であった。これらの値は、ESCA法を用い以下の測定条件で測定した。
・試料作製
アルミノシリケートガラス基板を1cm×1cmに切断し、得られたアルミノシリケートガラス基板片をカーボン製両面テープ上に乗せ固定した。アルミノシリケートガラス基板片表面のゴミ等を除くためにArスパッタを加速電圧2kVで6分間かけ、ESCA測定を実施した。
・測定
機器:アルバックファイ製 PHI Quantera SXM
X線源:単色化AlKα線、1486.6eV、25W、15kV
ビーム径:100μm
X線入射角:45°
測定範囲:500×500μm2
Pass energy:280.0(survey)、140.0eV(narrow)
Step size:1.00(survey)、0.250eV(narrow)
測定元素: C,N,O,Na,Mg,Al,Si,S,K,Ti,Zr,Nb
帯電補正:NeutralizerおよびAr+照射
アルミナ研磨材を含有する研磨液組成物であらかじめ粗研磨した、Ni-Pメッキされたアルミニウム合金基板を被研磨基板として用意した。
Al2O3などが添加されていない純粋なSiO2で構成されるシリケートガラス基板を被研磨基板として用意した。
実施例1、2、4および比較例1~12については、イオン交換水に対して、硫酸とHEDPとを添加した後、下記(1)~(11)の重合体をそれぞれ添加し、さらにシリカ粒子としてコロイダルシリカ粒子(平均粒子径:25nm、SF1(平均値):123、SF2(平均値):109)を添加し、pHを1.5に調整して研磨液組成物を得た。各成分の添加量は、研磨液組成物総重量に対して、硫酸が0.35重量%、HEDPが0.13重量%、(1)~(11)の重合体が0.01重量%、コロイダルシリカ粒子が9重量%となるようにした。実施例3については、硫酸とHEDPに代えてクエン酸を添加し、pHを2.5に調整した以外は実施例2と同様にして研磨液組成物を得た。各成分の添加量は、研磨液組成物総重量に対して、クエン酸が1.5重量%、下記(2)の重合体が0.01重量%、コロイダルシリカ粒子が9重量%となるようにした。
(1)β‐ナフタレンスルホン酸ホルマリン縮合物ナトリウム塩(花王社製)
(2)ブチルナフタレンスルホン酸-ナフタレンスルホン酸ホルマリン共縮合物ナトリウム塩(共縮合モル比20/80、花王社製)
(3)スチレン-スチレンスルホン酸共重合体(共縮合モル比18/82、花王社製)
(4)アクリル酸-アクリルアミド-2-メチルプロパンスルホン酸共重合体ナトリウム塩(共重合モル比89/11、東亞合成社製)
(5)β‐ナフタレンスルホン酸ホルマリン縮合物ナトリウム塩(花王社製)
(6)ポリビニルスルホン酸ナトリウム塩(Aldrich社製)
(7)ポリスチレンスルホン酸ナトリウム塩(PS-1:東ソー社製)
(8)スルホン酸系共重合体(A-6021:東亞合成社製)
(9)カルボン酸系共重合体アンモニウム塩(ポイズ2100:花王社製)
(10)ポリアクリル酸(A-10SL:東亞合成社製)
(11)スルホン酸系共重合体(A-6020:東亞合成社製)
重合体のアルミノシリケートガラスに対する吸着定数、重合体のシリカ粒子(コロイダルシリカ粒子)への吸着率、重合体の重量平均分子量、研磨液組成物のpH、シリカ粒子の平均粒子径、シリカ粒子のSF1及びSF2、及びうねりの測定は、以下のように行った。
前記(1)~(11)の重合体を、その濃度が0~5000ppmになるようにイオン交換水に添加して得た水溶液20g(25℃)に塩酸を加えてそのpHを1.5に調整した。この水溶液にアルミノシリケートガラス基板を粉砕して得た粒径約5μmのアルミノシリケートガラス粒子を0.5g添加し、攪拌した後、遠心分離機(コクサン社製 H-28F)を用いて3500rpmで15分間遠心分離した。次いで、アルミノシリケートガラス粒子を沈降させ、上澄み中に存在する全炭素数濃度を島津製作所製TOC-500で測定した。測定された炭素濃度と、既知濃度の前記重合体で作成した検量線とを用いて、上澄み中の前記重合体濃度cを算出し、仕込み濃度からこれを差し引いて、前記重合体の吸着量Aを算出した。重合体の添加量とアルミノシリケートガラス粒子への吸着量Aとをグラフにプロットし、下記式(1)を用いて25℃における吸着定数Kを算出した。
アルミノシリケートガラス粒子に代えてコロイダルシリカ粒子を使用し、前記(1)~(11)の重合体の濃度を100ppmとした以外は、上記吸着定数の測定方法と同様の方法に従い、シリカ粒子に未吸着の前記重合体の濃度を算出した。仕込み濃度100ppmから未吸着の前記重合体の濃度を差し引いて、シリカ粒子に吸着した前記重合体の濃度を算出し、これを仕込み濃度で除し、100倍した値を、シリカ粒子に対する前記重合体の吸着率とした。
前記(1)~(11)の重合体をクロロホルムに溶解し、GPC(ゲルパーミエーションクロマトグラフィー)を用いて、以下の条件で重量平均分子量を測定した。
<GPC条件>
カラム:G4000SWXL+G2000SWXL
溶離液:30mM CH3COONa/CH3CN=6/4(pH=6.9)
流量:1.0mL/min
カラム温度:40℃
検出:RI
標準物質:ポリスチレン(Mw842万,9.64万,A-500(東ソー社製)、Mw3万,4000(西尾工業社製)、Mw90万(ケムコ社製))
pHメーター(東亜電波工業(株)製、ガラス式水素イオン濃度指数計「HM-30G」を用いて、研磨液組成物(25℃)のpHを測定した。
コロイダルシリカ粒子を含む試料を、透過型電子顕微鏡「JEM-2000FX」(80kV、1~5万倍、日本電子社製)により当該製造業者が添付した説明書に従って観察し、TEM(Transmission Electron Microscope)像を写真撮影した。この写真をスキャナで画像データとしてパソコンに取り込み、解析ソフト「WinROOF ver.3.6」(販売元:三谷商事)を用いて、個々のシリカ粒子の円相当径を計測し、粒子径を求めた。このようにして、1000個のシリカ粒子の粒子径を求めた後、これらの平均値を算出し、この平均値を平均粒子径とした。
コロイダルシリカ粒子を含む試料を、上記平均粒子径の測定方法と同様の方法によりTEM像を写真撮影し、この写真をスキャナで画像データとしてパソコンに取り込み、上記と同様の解析ソフトを用いて、粒子一個の最大径と投影面積を計測し、SF1を算出した。このようにして、100個のシリカ粒子のSF1を求めた後、これらの平均値を算出した。SF2の場合は、上記と同様の解析ソフトを用いて、粒子一個の周長と投影面積を計測し、SF2を算出した。このようにして、100個のシリカ粒子のSF2を求めた後、これらの平均値を算出した。
被研磨基板がアルミノシリケートガラス基板およびNi-Pめっきアルミニウム合金基板である場合は、後述の研磨方法により研磨された10枚の基板から任意に4枚を選択し、その4枚について下記条件でうねりを測定した。その4枚についてのうねりの測定値の平均値を基板の中波長うねりとして算出した。その結果を、下記表1に、比較例1、9の研磨液組成物を用いた場合を100とした相対値として示す。被研磨基板がシリケートガラス基板である場合は、後述の研磨方法により研磨された1枚の基板について、下記条件でうねりを測定した。その結果を、下記表1に、比較例11の研磨液組成物を用いた場合を100とした相対値として示す。
測定機:New View 5032(Zygo社製)
レンズ:2.5倍
ズーム:0.5倍
測定波長:160~500μm(中波長うねり)
測定位置:アルミノシリケートガラス基板およびNi―Pめっきアルミニウム合金基板については、基板中心より半径25mmの部分を測定し、シリケートガラス基板については基板中心より半径10mmの部分を測定した。
解析ソフト:Zygo Metro Pro(Zygo社製)
実施例1~4、比較例1~12の研磨液組成物を用いた研磨は、下記の標準研磨試験の条件で行った。
[研磨条件]
(1)アルミノシリケートガラス基板の研磨条件
研磨試験機:スピードファム社製「両面9B研磨機」
研磨パッド:スエードタイプ(厚さ0.9mm、平均開孔径30μm)
研磨液組成物供給量:100mL/分(被研磨基板1cm2あたりの供給速度:約0.3mL/分)
下定盤回転数:32.5rpm
研磨荷重:8.4kPa
キャリア:アラミド製、厚さ0.45mm
研磨量:片面あたり2.5μmの研磨量をターゲットとして研磨
被研磨基板:アルミノシリケートガラス基板(外径65mm、内径20mm、厚さ0.635mm、研磨前の中波長うねりの値3.0Å)
投入基板枚数:10枚
リンス条件:荷重=2.0kPa、時間=2min、イオン交換水供給量=約2L/min
ドレス条件:1回研磨毎にイオン交換水を供給しながらブラシドレス2min
研磨試験機:スピードファム社製「両面9B研磨機」
研磨パッド:スエードタイプ(厚さ0.9mm、平均開孔径30μm)
研磨液組成物供給量:100mL/分(被研磨基板1cm2あたりの供給速度:約0.14mL/分)
下定盤回転数:32.5rpm
研磨荷重:8.4kPa
キャリア:アラミド製、厚さ1.0mm
研磨量:片面あたり2.5μmの研磨量をターゲットとして研磨
被研磨基板:Ni-Pめっきアルミニウム合金基板(外径95mm、内径25mm、厚さ1.27mm、研磨前の中波長うねりの値2.8Å)
投入基板枚数:10枚
リンス条件:荷重=2.0kPa、時間=2min、イオン交換水供給量=約2L/min
ドレス条件:1回研磨毎にイオン交換水を供給しながらブラシドレス2min
添加剤:添加剤として研磨液に過酸化水素水を0.4%添加した。
研磨試験機:エンギス社製「片面研磨機MA-300」
研磨パッド:スエードタイプ(厚さ0.9mm、平均開孔径30μm)
研磨液組成物供給量:10mL/分(被研磨基板1cm2あたりの供給速度:約0.3mL/分)
下定盤回転数:54rpm(基板に対するパッドの相対速度はアルミノシリケートガラス基板の研磨条件と同等の値である。)
研磨荷重:8.4kPa
キャリア:アラミド製、厚さ0.8mm
研磨量:片面あたり2.5μmの研磨量をターゲットとして研磨
被研磨基板:シリケートガラス基板(外径50mm、厚さ1.0mm、研磨前の中波長うねりの値4.1Å)
投入基板枚数:1枚
リンス条件:荷重=2.0kPa、時間=2min、イオン交換水供給量=約2L/min
ドレス条件:1回研磨毎にイオン交換水を供給しながらブラシドレス2min
Claims (13)
- シリカ粒子と、スルホン酸基を有する重合体と、水とを含有し、前記スルホン酸基を有する重合体のアルミノシリケートガラスに対する吸着定数が1.5~5.0L/gである、研磨液組成物を用いて被研磨アルミノシリケートガラス基板を研磨する工程を含む、ハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記スルホン酸基を有する重合体が、芳香族環を有する重合体である、請求項1に記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記スルホン酸基を有する重合体の重量平均分子量が3000~100000である、請求項1又は2に記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記被研磨アルミノシリケートガラス基板中のAlの含有量が3~25重量%である、請求項1~3のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記被研磨アルミノシリケートガラス基板中のNaの含有量が3~25重量%である、請求項1~4のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記研磨液組成物が、さらに三価カルボン酸を含有する、請求項1~5のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記研磨液組成物中における前記三価カルボン酸の含有量が0.05~10重量%である、請求項6に記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記研磨液組成物のpHが0.8~5である、請求項1~7のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記シリカ粒子がコロイダルシリカ粒子である、請求項1~8のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記シリカ粒子の平均粒子径が5~200nmである、請求項1~9のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記研磨液組成物中における前記スルホン酸基を有する重合体の含有量が0.0001~5重量%である、請求項1~10のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- 前記研磨液組成物中における前記シリカ粒子の含有量が1~20重量%である、請求項1~11のいずれかに記載のハードディスク用アルミノシリケートガラス基板の製造方法。
- シリカ粒子と、スルホン酸基を有する重合体と、水とを含有し、前記スルホン酸基を有する重合体のアルミノシリケートガラスに対する吸着定数が1.5~5.0L/gである、研磨液組成物を用いて被研磨アルミノシリケートガラス基板を研磨する工程を含む、ハードディスク用アルミノシリケートガラス基板の表面うねりを低減する方法。
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MY168569A (en) * | 2011-12-30 | 2018-11-13 | Hoya Corp | Method of manufacturing a substrate, method of manufacturing a magnetic disk glass substrate and method of manufacturing a magnetic disk |
US8896964B1 (en) | 2013-05-16 | 2014-11-25 | Seagate Technology Llc | Enlarged substrate for magnetic recording medium |
WO2016017812A1 (ja) * | 2014-07-31 | 2016-02-04 | Hoya株式会社 | 磁気ディスク用ガラス基板の製造方法及び磁気ディスクの製造方法 |
JP6558771B2 (ja) * | 2015-09-30 | 2019-08-14 | Hoya株式会社 | 磁気ディスク用基板の製造方法 |
JP6659449B2 (ja) * | 2016-05-09 | 2020-03-04 | 山口精研工業株式会社 | 無電解ニッケル−リンめっきされたアルミニウム磁気ディスク基板用研磨剤組成物 |
JP7209620B2 (ja) * | 2017-03-14 | 2023-01-20 | 株式会社フジミインコーポレーテッド | 研磨用組成物、その製造方法ならびにこれを用いた研磨方法および基板の製造方法 |
TW202229478A (zh) * | 2020-09-29 | 2022-08-01 | 日商福吉米股份有限公司 | 研磨用組成物及其製造方法、研磨方法以及基板的製造方法 |
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JP2007191696A (ja) * | 2005-12-22 | 2007-08-02 | Kao Corp | ガラス基板用研磨液組成物 |
JP2008013655A (ja) * | 2006-07-05 | 2008-01-24 | Kao Corp | ガラス基板用の研磨液組成物 |
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US7279119B2 (en) | 2001-06-14 | 2007-10-09 | Ppg Industries Ohio, Inc. | Silica and silica-based slurry |
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JP4667848B2 (ja) | 2004-12-13 | 2011-04-13 | 花王株式会社 | ガラス基板用研磨液組成物 |
JP2006193695A (ja) * | 2005-01-17 | 2006-07-27 | Fujimi Inc | 研磨用組成物 |
CN1986612B (zh) | 2005-12-22 | 2012-07-25 | 花王株式会社 | 玻璃基板用研磨液组合物 |
JP2009050920A (ja) | 2007-08-23 | 2009-03-12 | Asahi Glass Co Ltd | 磁気ディスク用ガラス基板の製造方法 |
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JP2007191696A (ja) * | 2005-12-22 | 2007-08-02 | Kao Corp | ガラス基板用研磨液組成物 |
JP2008013655A (ja) * | 2006-07-05 | 2008-01-24 | Kao Corp | ガラス基板用の研磨液組成物 |
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