WO2010038706A1 - 研磨液及び研磨方法 - Google Patents
研磨液及び研磨方法 Download PDFInfo
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- WO2010038706A1 WO2010038706A1 PCT/JP2009/066810 JP2009066810W WO2010038706A1 WO 2010038706 A1 WO2010038706 A1 WO 2010038706A1 JP 2009066810 W JP2009066810 W JP 2009066810W WO 2010038706 A1 WO2010038706 A1 WO 2010038706A1
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- polishing
- acid
- polishing liquid
- colloidal silica
- water
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/005—Control means for lapping machines or devices
- B24B37/0056—Control means for lapping machines or devices taking regard of the pH-value of lapping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
- B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
- B24B37/044—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor characterised by the composition of the lapping agent
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
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- 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
- C09K3/1409—Abrasive particles per se
-
- 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
Definitions
- the present invention relates to a polishing liquid used for polishing a glass substrate, a flat plate such as a semiconductor substrate having a silica thin film formed thereon, and a method for polishing a flat plate using the polishing liquid.
- a polishing liquid (colloidal silica slurry) containing colloidal silica is used in a polishing process of a glass substrate that is used in the manufacture of hard disks, photomasks, and the like and requires high-precision smoothness.
- the polishing process using the colloidal silica slurry has a lower polishing rate than the conventional polishing process using cerium oxide, and is often applied only to finish polishing. For this reason, many attempts have been made to increase the polishing rate (see, for example, Patent Documents 1 and 2).
- the glass substrate contains an alkali metal oxide or an alkaline earth metal oxide (typical).
- the alkali metal component or alkaline earth metal component may be eluted during polishing.
- the pH of the slurry may change, and the colloidal silica slurry may deviate from the metastable region, the colloidal silica may aggregate, the slurry may gel, and polishing may not proceed.
- the present invention aims to increase the polishing efficiency by increasing the polishing rate without adjusting the polishing liquid to the acidic side when polishing a flat plate such as a glass substrate using a polishing liquid containing colloidal silica.
- the present inventor thought that the polishing rate could be increased if the contact probability between the glass substrate and the colloidal silica can be increased in an alkaline region where the dispersibility of the colloidal silica is stable. Therefore, from the viewpoint of maintaining the dispersibility of the colloidal silica particles, without reducing the electric repulsive force between the colloidal silica particles, a method for reducing the electric repulsive force between the colloidal silica particles and the glass substrate is studied. It has been found that by adding a specific potential adjusting component such as a specific electrolyte to the polishing liquid, the electrical repulsive force between the glass substrate and colloidal silica is reduced and the polishing rate is increased. Further, as a method for evaluating the electric repulsive force, attention was paid to the measurement of the ⁇ potential on the surface of the glass substrate, and it was found that the polishing rate increased as the ⁇ potential increased, leading to the present invention.
- a specific potential adjusting component such as a specific electrolyte
- the present invention provides the following polishing liquid, polishing method and method for producing a glass substrate for a magnetic disk.
- colloidal silica having an average particle size of 40 nm or more
- a polishing liquid containing water and a ⁇ potential adjusting component A polishing liquid, wherein the ⁇ potential adjusting component comprises at least one sodium salt selected from the group consisting of sodium nitrate and sodium sulfate, and has a pH of 8 or more.
- a polishing liquid containing water and a ⁇ potential adjusting component is selected from the group consisting of at least one water-soluble organic polymer selected from the group consisting of water-soluble polyether polyamines and water-soluble polyalkylene polyamines, and hydrochloric acid, sulfuric acid, nitric acid, nitrous acid, sulfurous acid and amidosulfuric acid.
- a polishing liquid comprising at least one acid and containing the acid in a molar ratio of 0.6 to 1.4 with respect to the water-soluble organic polymer, and having a pH of 8 or more.
- the polishing method according to (7) wherein the ⁇ potential on the surface of the object to be polished is set to ⁇ 90 mV or more in the step.
- the object to be polished is made of silicate glass, quartz glass or quartz, or the surface to be polished of the object to be polished, i.e., the surface to be polished contains silicic acid or silicate.
- the polishing method as described in 8). (10) A method for producing a glass substrate for a magnetic disk using the polishing method according to (7), (8) or (9) above, that is, a glass substrate for a magnetic disk comprising a step of polishing a glass substrate by the polishing method Production method.
- FIG. 1 is a graph showing the relationship between the electrolyte concentration of a polishing liquid having a pH of 9 (the electrolyte is sodium nitrate), the ⁇ potential of the glass substrate surface, and the ⁇ potential of colloidal silica.
- the surface of the glass substrate has a minus large potential, and the glass substrate and the colloidal silica are not in contact with each other.
- the electrolyte concentration increases, the ⁇ potential on the surface of the glass substrate increases, and the glass substrate and the colloidal silica easily come into contact with each other.
- the ⁇ potential on the surface of the glass substrate becomes almost the same as the ⁇ potential of colloidal silica, and the contact becomes easier. Further, since the ⁇ potential of colloidal silica is almost the same between the case where the electrolyte is added and the case where the electrolyte is not added, it can be seen that the dispersion state of the colloidal silica is not affected even if the electrolyte is added.
- a flat plate such as a glass substrate can be polished at a high polishing rate using colloidal silica.
- a glass substrate for a magnetic disk usually contains an alkali metal oxide or an alkaline earth metal oxide. If such a glass substrate is polished with the polishing liquid of the present invention, the colloidal silica as described above is used. Aggregation is less likely to occur.
- FIG. 1 is a graph for explaining the principle of the present invention, and is a graph showing the relationship between the electrolyte concentration of the polishing liquid, the ⁇ potential of the glass substrate surface, and the ⁇ potential of colloidal silica.
- FIG. 2 is a schematic diagram showing an apparatus for measuring the ⁇ potential on the glass substrate surface.
- a magnetic disk glass substrate (hereinafter sometimes simply referred to as “glass substrate”) is usually produced through the following steps. That is, a circular hole is made in the center of the circular glass plate, and chamfering, main surface lapping, and end mirror polishing are sequentially performed. Thereafter, a circular glass plate having been subjected to such processing is laminated and the inner peripheral end face is etched, and a polysilazane compound-containing liquid is applied to the etched inner peripheral end face by a spray method or the like, followed by firing. A coating (protective coating) is formed on the inner peripheral end surface. Next, the main surface of the circular glass plate with the coating film formed on the inner peripheral end face is polished to obtain a flat and smooth surface, which is a glass substrate.
- the main surface lapping step is divided into a rough lapping step and a fine lapping step, and a shape processing step (circular shape) between them. (Glass perforation, chamfering, end surface polishing) at the center of the glass plate may be provided, or a chemical strengthening step may be provided after the main surface polishing step.
- a shape processing step circular shape between them.
- the main surface lapping is usually performed using aluminum oxide abrasive grains having an average particle diameter of 6 to 8 ⁇ m or aluminum oxide abrasive grains.
- the lapped main surface is usually polished by 30 to 40 ⁇ m and then polished using the polishing liquid of the present invention, and the surface roughness Ra is typically 0.16 nm or less.
- polishing is performed using a polishing liquid containing cerium oxide having an average particle diameter of 0.15 to 0.25 ⁇ m and a urethane polishing pad, and the surface roughness Ra is set to 0.4 to 0.
- the reduction amount (polishing amount) of the plate thickness in this polishing is typically 1 to 2 ⁇ m.
- the main surface is further polished with the polishing liquid of the present invention under a condition where the polishing pressure is 0.5 to 30 kPa, for example.
- the polishing pressure is preferably 4 kPa or more.
- the polishing pressure is less than 4 kPa, the stability of the glass substrate at the time of polishing is lowered and the glass substrate tends to flutter, and as a result, the undulation of the main surface may be increased.
- a urethane foam resin having a Shore D hardness of 45 to 75, a compressibility of 0.1 to 10% and a density of 0.5 to 1.5 g / cm 3 , and a Shore A hardness of 30 to 99, a urethane foam resin having a compression rate of 0.5 to 10% and a density of 0.2 to 0.9 g / cm 3 , or a Shore A hardness of 5 to 65, a compression rate of 0.1 to 60%, and A typical example is a foamed urethane resin having a density of 0.05 to 0.4 g / cm 3 .
- the Shore A hardness of the polishing pad is preferably 20 or more. If it is less than 20, the polishing rate may decrease.
- the Shore D hardness and Shore A hardness are measured by the methods of measuring the durometer A hardness and D hardness of plastic specified in JIS K7215, respectively.
- the compression rate (unit:%) is measured as follows. That is, for a measurement sample cut out to an appropriate size from the polishing pad, a material thickness t0 when a stress of 10 kPa is applied for 30 seconds from a no-load state using a shopper type thickness measuring device is obtained, Next, the material thickness t1 when a stress load of 110 kPa is immediately pressed for 5 minutes from the state where the thickness is t0 is calculated, and (t0 ⁇ t1) ⁇ 100 / t0 is calculated from the values of t0 and t1, The compression rate.
- the hardness of the polishing pad is determined by the hardness (hereinafter referred to as IRHD hardness) measured using an IRHD micro detector of a general-purpose automatic hardness tester for rubber, manufactured by H. Burleys, which can measure the hardness of each polishing pad sample. It is preferable that The IRHD hardness of the polishing pad is preferably 20-80.
- the polishing liquid of the present invention has a pH of 8 or more, the colloidal silica as described above hardly aggregates.
- the pH is preferably 9 or higher.
- the pH is typically 10 or less. If the pH exceeds 10, the polishing pad is easily eroded when the polishing pad is made of urethane.
- the type of colloidal silica is not limited, but the one made by the water glass method is common.
- the average particle size of the colloidal silica is 40 nm or more, preferably 40 nm or more and 100 nm or less. If it is less than 40 nm, colloidal silica may be aggregated. If it exceeds 100 nm, the production cost of colloidal silica is high, which is economically disadvantageous.
- the average particle size of colloidal silica is more preferably more than 40 nm.
- the content of colloidal silica in the polishing liquid is typically 5 to 40% by mass, and more preferably 10 to 15% by mass.
- the medium is a so-called aqueous medium, and the polishing liquid of the present invention contains water.
- the ⁇ potential adjusting component is a component for setting the ⁇ potential on the glass substrate surface to preferably ⁇ 90 mV or more when the polishing liquid of the present invention is brought into contact with the glass substrate while maintaining the ⁇ potential of the colloidal silica substantially constant. is there.
- this ⁇ potential is referred to as ⁇ S
- ⁇ S is less than ⁇ 90 mV
- the effect due to the decrease in the electric repulsive force is reduced and the polishing rate is difficult to increase.
- ⁇ S is ⁇ 50 mV or more.
- a glass substrate and a quartz plate with a coating film are opposed to each other at a predetermined interval, and the glass substrate and the coating are further coated.
- a polishing liquid simulation solution containing latex particles ( ⁇ potential 0 mV) is put instead of colloidal silica, and the glass substrate and the quartz plate with a coating film are placed.
- the electrophoretic velocity of latex particles at each height in between is measured by the Doppler method.
- the difference between the electrophoresis speed of the latex particles at a position close to the glass substrate and the electrophoresis speed of the latex particles at a position close to the quartz plate with the coating film is obtained and set as the ⁇ potential of the glass substrate.
- ⁇ potential measurement system ELSZ-1 manufactured by Otsuka Electronics Co., Ltd. can be used among commercially available products.
- the reason for measuring the ⁇ potential of the glass substrate using a polishing liquid simulation liquid containing latex particles instead of a polishing liquid containing colloidal silica is as follows. That is, when a liquid containing colloidal silica is used, the ⁇ potential changes depending on the pH, and this change must be taken into account when calculating the ⁇ potential of the glass substrate. On the other hand, latex particles have a constant ⁇ potential in the entire pH range (pH 2 to 12) measurable with a ⁇ potential measuring device, and maintain the monodispersed state and do not agglomerate. is there.
- the zeta potential adjusting component is selected from (1) at least one sodium salt selected from the group consisting of sodium nitrate and sodium sulfate, or (2) selected from the group consisting of water-soluble polyether polyamine and water-soluble polyalkylene polyamine. And at least one acid selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, nitrous acid, sulfurous acid and amidosulfuric acid (mixture).
- Sodium nitrate or sodium sulfate is used as the ⁇ potential adjusting component, and it is easy to increase ⁇ S while maintaining the ⁇ potential of the colloidal silica substantially constant, and contains an alkali metal oxide or an alkaline earth metal oxide. Salts formed from alkali metal or alkaline earth metal components eluted from the glass into the polishing liquid and the anion components of these sodium salts are easily dissolved in water, and the salt prevents the colloidal silica from contacting the glass substrate. Because there are few.
- the total content thereof is preferably 0.01 to 0.4 mol, that is, 0.01 to 0.4 mol / L per liter of the polishing liquid. . If it is less than 0.01 mol / L, it may be difficult to increase ⁇ S. More preferably, it is 0.05 mol / L or more, and typically 0.08 mol / L or more. If it exceeds 0.4 mol / L, the ⁇ potential of the colloidal silica particles tends to be reduced and aggregation tends to occur. More preferably, it is 0.3 mol / L or less, and typically 0.2 mol / L or less.
- the water-soluble organic polymer and acid are used as the zeta potential adjusting component because the water-soluble organic polymer (hereinafter sometimes simply referred to as water-soluble organic polymer) has amine groups at both ends. This is because when it coexists with an acid, it functions as an electrolyte and raises ⁇ S like sodium nitrate, and it is easy to raise ⁇ S while maintaining the ⁇ potential of colloidal silica substantially constant.
- the content of the water-soluble organic polymer is preferably 0.0001 to 0.5 mol / L. If it is less than 0.0001 mol / L, it may be difficult to increase ⁇ S while maintaining the ⁇ potential of colloidal silica substantially constant. More preferably, it is 0.0002 mol / L or more, typically 0.0005 mol / L or more. If it exceeds 0.5 mol / L, colloidal silica tends to aggregate. More preferably, it is 0.1 mol / L or less.
- the water-soluble polyether polyamine is preferably 100 to 2000, more preferably 100 to 1000, and still more preferably 200 to 900 in terms of weight average molecular weight.
- the water-soluble polyalkylene polyamine preferably has a weight average molecular weight of 100 to 2000, more preferably 100 to 1000, and still more preferably 200 to 1000.
- the polyether polyamine means a compound having two or more amino groups and two or more etheric oxygen atoms.
- the amino group is preferably a primary amino group (—NH 2 ).
- the amino group may have a secondary amino group (—NH—) or a tertiary amino group, but the polyether polyamine in the present invention has two or more primary amino groups and other amino groups.
- a compound having substantially no group is preferable, and a polyether diamine having only two primary amino groups is particularly preferable.
- the polyether polyamine is preferably a compound having a structure in which a hydrogen atom of a hydroxyl group of a polyhydric alcohol or polyether polyol is substituted with an aminoalkyl group.
- the polyhydric alcohol is preferably a divalent to hexavalent alcohol, particularly preferably a dihydric alcohol
- the polyether polyol is preferably a divalent to hexavalent polyoxyalkylene polyol, particularly preferably a polyoxyalkylene diol.
- aminoalkyl groups include 2-aminoethyl group, 2-aminopropyl group, 2-amino-1-methylethyl group, 3-aminopropyl group, 2-amino-1,1-dimethylethyl group, 4-aminobutyl group
- An aminoalkyl group having 2 to 6 carbon atoms such as a group is preferred.
- the above polyalkylene polyamine means a compound in which three or more amino groups are bonded via an alkylene group.
- the terminal amino group is preferably a primary amino group, and the amino group in the molecule is preferably a secondary amino group. More preferably, it is a linear polyalkylene polyamine having a primary amino group at both molecular terminals and having one or more secondary amino groups in the molecule.
- the two amino group-binding moieties bonded to the primary amino groups at both ends are the same and different from the other amino group-bonding moieties.
- the number of carbon atoms contained in one amino group-bonding moiety is preferably 2-8, and in particular, the number of carbon atoms contained in the two amino-group bonding moieties bonded to the primary amino groups at both ends is 2-8, and the others
- the number of carbon atoms contained in the amino group-bonded moiety is preferably 2-6.
- the compound which has a structure represented by following formula (1) is preferable.
- R represents an alkylene group having 2 to 8 carbon atoms
- X represents an oxygen atom or —NH—
- k represents an integer of 2 or more in the case of polyetherdiamine, and in the case of polyalkylenepolyamine. Represents an integer of 1 or more.
- a plurality of R in one molecule may be different from each other.
- the polyether diamine is preferably a compound having a structure represented by the following formula (2)
- the polyalkylene polyamine is preferably a compound having a structure represented by the following formula (3).
- R1 is an ethylene group or propylene group
- R2 is an alkylene group having 2 to 6 carbon atoms
- R3 is an alkylene group having 2 to 6 carbon atoms
- R4 is an alkylene group having 2 to 8 carbon atoms
- m is an integer of 1 or more
- n represents an integer of 1 or more
- R1 and R2 may be the same or different
- R3 and R4 may be the same or different.
- Specific polyether diamines represented by the formula (2) include, for example, polyoxypropylene diamine (R1, R2 is a propylene group, m is a compound having 1 or more), polyoxyethylene diamine (R1, R2 are ethylene groups, a compound in which m is 1 or more), 4,7,10-trioxa-tridecane-1,13-diamine (a compound in which R1 is an ethylene group, R2 is a trimethylene group, and m is 2).
- polyalkylene polyamine represented by the formula (3) examples include tetraethylenepentamine (a compound in which R3 and R4 are ethylene groups and n is 2), pentaethylenehexamine (R3 and R4 are ethylene groups, n 3), heptaethyleneoctamine (R3, R4 are ethylene groups, n is a compound 5), N, N′-bis (3-aminopropyl) -ethylenediamine (R3 is ethylene group, R4 is trimethylene group, n is 1), N, N′-bis (2-aminoethyl) -1,4-butanediamine (R3 is a tetramethylene group, R4 is an ethylene group, and n is 1).
- tetraethylenepentamine a compound in which R3 and R4 are ethylene groups and n is 2
- pentaethylenehexamine R3 and R4 are ethylene groups, n 3
- heptaethyleneoctamine R3, R4 are ethylene groups
- the convex portions on the surface of the glass substrate are easily selectively scraped by amino groups or amine bases in the molecule, and Ra is reduced.
- the acid used in combination with the water-soluble organic polymer is limited to the above six acids because the solubility of a salt formed by an anion of these acids and an alkali metal ion or alkaline earth metal ion in water is high. This is because even if the glass to be polished contains an alkali metal oxide or an alkaline earth metal oxide, the salt hardly interferes with the contact between the glass and the colloidal silica.
- the molar ratio of the water-soluble organic polymer content and the total content of the six acids is in the range of 1: 0.6 to 1: 1.4. That is, the content ratio of the acid to the water-soluble organic polymer is 0.6 to 1.4 in molar ratio. Outside this range, colloidal silica tends to aggregate. This molar ratio is typically between 0.8 and 1.2.
- the present invention has been described based on the glass substrate, the present invention can be applied to the removal of the silica passivation film of the semiconductor substrate protected by the silica passivation film, for example.
- polishing of a semiconductor substrate protected with a silica passivation film using a polishing liquid containing colloidal silica has been performed, and it is possible to remove the silica passivation film by polishing similarly using the polishing liquid of the present invention. it can.
- the polishing liquid of the present invention is suitable for polishing silicate glass, particularly silicate glass containing 1 mol% or more of alkali metal oxide or alkaline earth metal oxide, but is not limited thereto, and is not limited to quartz glass. You may apply to other glass, quartz, etc.
- Silicate glass plate (mol% display content: Na 2 O: 5%, K 2 O: 8%, MgO: 11%) formed by the float process, outer diameter 65 mm, inner diameter 20 mm, plate thickness 0.635 mm It was processed into a donut-shaped circular glass plate (a circular glass plate having a circular hole in the center) from which a glass substrate of the above was obtained.
- the inner peripheral surface and the outer peripheral surface were ground using a diamond grindstone, and the upper and lower surfaces of the glass plate were lapped using aluminum oxide abrasive grains.
- the end surfaces of the inner and outer circumferences were chamfered so that the chamfering width was 0.15 mm and the chamfering angle was 45 °.
- a cerium oxide slurry was used as an abrasive
- a brush was used as a polishing tool
- the end surface was mirror-finished by brush polishing.
- the processing amount was 30 ⁇ m in terms of the removal amount in the radial direction.
- the upper and lower main surfaces were polished by a double-side polishing apparatus using a cerium oxide slurry (cerium oxide average particle size: about 1.1 ⁇ m) as an abrasive and a urethane pad as a polishing tool.
- the processing amount was 35 ⁇ m in total in the thickness direction of the upper and lower main surfaces.
- the upper and lower main surfaces are polished by a double-side polishing apparatus using cerium oxide (average particle diameter: about 0.2 ⁇ m) smaller than the above cerium oxide as an abrasive and a urethane pad as a polishing tool. Went.
- the amount of processing was 1.6 ⁇ m in total in the thickness direction of the upper and lower surfaces.
- the surface roughness Ra was 0.48 nm.
- Example 1 50 mL of 1M-NaNO 3 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, 125 mL of colloidal silica (product name ST-XL) manufactured by Nissan Chemical Industries, Ltd. having an average particle diameter of 50 nm was added to prepare a test slurry A.
- the test slurry A had a colloidal silica content of 12% by mass, a NaNO 3 content of 0.1 mol / L, and a pH of 9.41.
- the main surface of the glass substrate is the slurry as an abrasive, the IRHD hardness is 55.5, the Shore A hardness is 53.5 °, the compression rate is 1.9%, and the density is 0.24 g as an abrasive.
- polishing pad made of urethane foam resin of / cm 3 polishing was performed for 20 minutes using a FAM12B manufactured by Speed Fam Co., Ltd. with a polishing pressure of 12 kPa and a platen rotation speed of 40 rpm.
- the following cleaning was performed. That is, pure water shower cleaning, scrub cleaning with Berglin and water, scrub cleaning with Berglin and an alkaline detergent, scrub cleaning with Berglin and water, and pure water shower cleaning were sequentially performed, followed by air blowing. Thereafter, the weight was measured, and the polishing rate was calculated from the weight loss, and it was 0.102 ⁇ m / min.
- the ⁇ S at this time was measured as follows. That is, 50 mL of 1M-NaNO 3 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion.
- the cell was connected to a ⁇ potential evaluation apparatus (configuration is the same as in FIG. 2) manufactured by Otsuka Electronics Co., Ltd. At this time, soda lime glass was placed on the glass substrate of the cell. Then, the previously prepared dispersion was placed in the apparatus, and the ⁇ potential ⁇ S of the glass substrate was measured. As a result, ⁇ S was ⁇ 48.93 mV.
- Example 2 50 mL of 1M-Na 2 SO 4 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, 125 mL of colloidal silica (product name ST-XL) manufactured by Nissan Chemical Industries, Ltd. having an average particle diameter of 50 nm was added. Thus, the test slurry B was prepared. This test slurry B had a colloidal silica content of 12% by mass, a NaSO 4 content of 0.1 mol / L, and a pH of 9.27.
- colloidal silica product name ST-XL
- ⁇ S at this time was measured as follows. That is, 50 mL of 1M-Na 2 SO 4 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion. Then, ⁇ S was measured in the same manner as in Example 1. As a result, ⁇ S was ⁇ 13.56 mV.
- test slurry a (Comparative Example 1) While stirring 375 mL of distilled water, 125 mL of colloidal silica (product name ST-XL) manufactured by Nissan Chemical Industries, Ltd. having an average particle diameter of 50 nm was added to prepare a test slurry a.
- the test slurry a had a colloidal silica content of 12 mass% and a pH of 9.89.
- the polishing rate was calculated by polishing for 20 minutes in the same manner as in Example 1. The result was 0.072 ⁇ m / min.
- ⁇ S was ⁇ 50 mV or more and the polishing rate was 0.088 ⁇ m / min or more, whereas in Comparative Example 1, ⁇ S was less than ⁇ 50 mV, and the polishing rate was Example 1. 2 and lower.
- test slurry C was prepared.
- the test slurry C had a colloidal silica content of 12% by mass, a NaNO 3 content of 0.01 mol / L, and a pH of 9.30.
- ⁇ S at this time was measured as follows. That is, 5 mL of 1M-NaNO 3 aqueous solution was added to 370 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion. Then, ⁇ S was measured in the same manner as in Example 1. As a result, ⁇ S was ⁇ 88.09 mV.
- Example 4 50 mL of 1M-NaNO 3 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, 125 mL of colloidal silica (product name ST-ZL) manufactured by Nissan Chemical Industries, Ltd. having an average particle diameter of 80 nm was added. In this way, test slurry D was prepared. The test slurry D had a colloidal silica content of 12% by mass, a NaSO 4 content of 0.1 mol / L, and a pH of 9.13.
- colloidal silica product name ST-ZL
- ⁇ S at this time was measured as follows. That is, 50 mL of 1M-NaNO 3 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion. Then, ⁇ S was measured in the same manner as in Example 1. As a result, ⁇ S was ⁇ 48.93 mV.
- Test slurry b (Comparative Example 2) While stirring 375 mL of distilled water, 125 mL of colloidal silica (product name ST-ZL) manufactured by Nissan Chemical Industries, Ltd. having an average particle diameter of 80 nm was added to prepare a test slurry b.
- This test slurry b had a colloidal silica content of 12 mass% and a pH of 9.41. Further, ⁇ S was measured to be ⁇ 165.56 mV.
- test slurry c was prepared.
- the test slurry c had a colloidal silica content of 14% by mass, a NaNO 3 content of 0.1 mol / L, and a pH of 9.30.
- ⁇ S at this time was measured as follows. That is, 50 mL of 1M-NaNO 3 aqueous solution was added to 325 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion. Then, ⁇ S was measured in the same manner as in Example 1. As a result, ⁇ S was ⁇ 48.93 mV.
- polishing was performed for 20 minutes in the same manner as in Example 1 except that the test slurry d was used, and the polishing rate was calculated to be 0.035 ⁇ m / min.
- Example 5 To 370 mL of distilled water, 2.5 g of a 0.1 M polyetheramine (weight average molecular weight 600) aqueous solution and 2.5 g of a 0.1 M nitric acid aqueous solution were added and stirred. While stirring, 125 mL of colloidal silica (product name ST-XL) having an average particle diameter of 50 nm from Nissan Chemical Industries, Ltd. was added. In this way, a test slurry E was prepared. The test slurry E had a colloidal silica content of 12% by mass, a polyetheramine / nitric acid molar ratio of 1, and a pH of 9.23.
- colloidal silica product name ST-XL
- ⁇ S at this time was measured as follows. That is, 2.5 g of 0.1M-polyetheramine (weight average molecular weight 600) aqueous solution and 2.5 g of 0.1M nitric acid aqueous solution were added to 370 mL of distilled water and stirred. While stirring, an appropriate amount of latex particle aqueous solution (average particle size 204 nm) having a solid content concentration of 0.01% was added to obtain a dispersion. Then, ⁇ S was measured in the same manner as in Example 1. As a result, ⁇ S was ⁇ 24.30 mV.
- test slurry F was prepared.
- the test slurry F had a colloidal silica content of 12% by mass, a polyetheramine / nitric acid molar ratio of 1, and a pH of 9.34.
- Example 2 polishing was performed for 20 minutes in the same manner as in Example 1 except that the test slurry F was used. Similarly, ⁇ S was measured. As a result, ⁇ S was ⁇ 12.21 mV.
- test slurry e was prepared.
- the test slurry e had a colloidal silica content of 12% by mass, a polyetheramine / nitric acid molar ratio of 1.5, and a pH of 10.5. This slurry had a high viscosity, and a gelation phenomenon was confirmed.
- a flat plate such as a glass substrate can be polished at a high polishing rate using colloidal silica.
- a glass substrate for a magnetic disk usually contains an alkali metal oxide or an alkaline earth metal oxide. If such a glass substrate is polished with the polishing liquid of the present invention, the colloidal silica as described above is used. Aggregation is less likely to occur.
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Abstract
Description
(1)平均粒径が40nm以上であるコロイダルシリカ、
水、および
ζ電位調整成分
を含有する研磨液であって、
ζ電位調整成分が、硝酸ナトリウムおよび硫酸ナトリウムからなる群から選ばれる少なくとも1つのナトリウム塩からなるものであり、pHが8以上である研磨液。
(2)平均粒径が40nm以上であるコロイダルシリカ、
水、および
ζ電位調整成分
を含有する研磨液であって、
ζ電位調整成分が、水溶性ポリエーテルポリアミンおよび水溶性ポリアルキレンポリアミンからなる群から選ばれる少なくとも1つの水溶性有機高分子と塩酸、硫酸、硝酸、亜硝酸、亜硫酸およびアミド硫酸からなる群から選ばれる少なくとも1つの酸とからなり、前記水溶性有機高分子に対し前記酸をモル比で0.6~1.4の割合で含むものであり、pHが8以上である研磨液。
(3)前記ナトリウム塩の含有量が0.01~0.4モル/Lである上記(1)に記載の研磨液。
(4)前記水溶性有機高分子の含有量が0.0001~0.5モル/Lである上記(2)に記載の研磨液。
(5)コロイダルシリカの平均粒径が100nm以下である上記(1)~(4)の何れか1項に記載の研磨液。
(6)pHが9~10である上記(1)~(5)の何れか1項に記載の研磨液。
(7)上記(1)~(6)の何れか1項に記載の研磨液を用いて被研磨体を研磨する工程を含む研磨方法。
(8)前記工程において被研磨体の表面のζ電位を-90mV以上にする上記(7)に記載の研磨方法。
(9)被研磨体がケイ酸塩ガラス、石英ガラスもしくは石英からなる、または、被研磨体の研磨されるべき表面すなわち被研磨表面がケイ酸またはケイ酸塩を含有する上記(7)または(8)に記載の研磨方法。
(10)上記(7)、(8)または(9)に記載の研磨方法を用いる磁気ディスク用ガラス基板の製造方法、すなわち前記研磨方法によってガラス基板を研磨する工程を含む磁気ディスク用ガラス基板の製造方法。
また、磁気ディスク用ガラス基板は、通常アルカリ金属酸化物またはアルカリ土類金属酸化物を含有するが、本発明の研磨液によってこのようなガラス基板を研磨すれば先に述べたようなコロイダルシリカの凝集が起こりにくくなる。
なお、研磨パッドのショアD硬度およびショアA硬度の測定においては研磨パッド試料を重ね合わせ、それらの硬度が測定されるので研磨現象を支配する研磨パッドの硬度として適切ではないおそれがある。したがって、研磨パッド試料1枚毎にその硬度を測定できるH・バーレイス社製ゴム用汎用自動硬度計デジテストのIRHDマイクロ検出器を用いて測定した硬度(以下、IRHD硬度という。)をもって研磨パッドの硬度とすることが好ましい。研磨パッドのIRHD硬度は20~80であることが好ましい。
H2N-(R-X-)k-R-NH2 (1)
ただし、Rは炭素数2~8のアルキレン基を表し、Xは酸素原子または-NH-を表し、kは、ポリエーテルジアミンの場合には2以上の整数を表し、ポリアルキレンポリアミンの場合には1以上の整数を表す。1分子中の複数のRは互いに異なっていてもよい。
H2N-R2-O-(R1-O-)m-R2-NH2 (2)
H2N-R4-NH-(R3-NH-)n-R4-NH2 (3)
ただし、R1はエチレン基またはプロピレン基、R2は炭素数2から6のアルキレン基、R3は炭素数2から6のアルキレン基、R4は炭素数2~8のアルキレン基、mは1以上の整数、nは1以上の整数を表し、R1とR2は同一でも異なっていてもよく、R3とR4は同一でも異なっていてもよい。
フロート法で成形されたシリケートガラス板(モル%表示含有量が、Na2O:5%、K2O:8%、MgO:11%)を、外径65mm、内径20mm、板厚0.635mmのガラス基板が得られるようなドーナツ状円形ガラス板(中央に円孔を有する円形ガラス板)に加工した。なお、内周面および外周面の研削加工はダイヤモンド砥石を用いて行い、ガラス板上下面のラッピングは酸化アルミニウム砥粒を用いて行った。
蒸留水325mLに対し、1M-NaNO3水溶液を50mL添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加して試験スラリーAを調製した。この試験スラリーAのコロイダルシリカ含有量は12質量%、NaNO3含有量は0.1モル/L、pHは9.41であった。
蒸留水325mLに対し、1M-Na2SO4水溶液を50mL添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加した。このようにして、試験スラリーBを調整した。この試験スラリーBのコロイダルシリカ含有量は12質量%、NaSO4含有量は0.1モル/L、pHは9.27であった。
蒸留水375mLを攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加し、試験スラリーaを調製した。この試験スラリーaのコロイダルシリカ含有量は12質量%、pHは9.89であった。
蒸留水370mLに対し、1M-NaNO3水溶液を5mL添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径80nmのコロイダルシリカ(製品名ST‐ZL)を125mL添加した。このようにして、試験スラリーCを調製した。この試験スラリーCのコロイダルシリカ含有量は12質量%、NaNO3含有量は0.01モル/L、pHは9.30であった。
蒸留水325mLに対し、1M-NaNO3水溶液を50mL添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径80nmのコロイダルシリカ(製品名ST‐ZL)を125mL添加した。このようにして、試験スラリーDを調製した。この試験スラリーDのコロイダルシリカ含有量は12質量%、NaSO4含有量は0.1モル/L、pHは9.13であった。
蒸留水375mLを攪拌したまま、日産化学工業(株)製の平均粒径80nmのコロイダルシリカ(製品名ST‐ZL)を125mL添加し、試験スラリーbを調製した。この試験スラリーbのコロイダルシリカ含有量は12質量%、pHは9.41であった。また、ζSを測定した結果-165.56mVであった。
蒸留水325mLに対し、1M-NaNO3水溶液を50mL添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径30nmのコロイダルシリカ(製品名ST‐50)を125mL添加した。このようにして、試験スラリーcを調製した。この試験スラリーcのコロイダルシリカ含有量は14質量%、NaNO3含有量は0.1モル/L、pHは9.30であった。
蒸留水375mLを攪拌したまま、日産化学工業(株)製の平均粒径30nmのコロイダルシリカ(製品名ST-50)を125mL添加し、試験スラリーdを調製した。この試験スラリーdのコロイダルシリカ含有量は14質量%、pHは9.51であった。
蒸留水370mLに対し、0.1M-ポリエーテルアミン(重量平均分子量600)水溶液を2.5g、0.1M-硝酸水溶液を2.5g添加し、攪拌した。攪拌したまま、日産化学工業(株)の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加した。このようにして、試験スラリーEを調製した。この試験スラリーEのコロイダルシリカ含有量は12質量%、ポリエーテルアミンと硝酸のモル比は1、pHは9.23であった。
蒸留水355mLに対し、0.1M-ポリエーテルアミン(重量平均分子量600)水溶液を10g、0.1M-硝酸水溶液を10g添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加した。このようにして、試験スラリーFを調製した。この試験スラリーFのコロイダルシリカ含有量は12質量%、ポリエーテルアミンと硝酸のモル比は1、pHは9.34であった。
蒸留水355mLに対し、0.1M-ポリエーテルアミン(重量平均分子量600)水溶液を12g、0.1M-硝酸水溶液を8g添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加した。このようにして、試験スラリーeを調製した。この試験スラリーeのコロイダルシリカ含有量は12質量%、ポリエーテルアミンと硝酸のモル比は1.5、pHは10.5であった。このスラリーは粘度が高くなり、ゲル化現象が確認できた。
蒸留水355mLに対し、0.1M-ポリエーテルアミン(重量平均分子量600)水溶液を6.7g、0.1M-硝酸水溶液を13.3g添加し、攪拌した。攪拌したまま、日産化学工業(株)製の平均粒径50nmのコロイダルシリカ(製品名ST‐XL)を125mL添加した。このようにして、試験スラリーfを調製した。この試験スラリーfのコロイダルシリカ含有量は12質量%、ポリエーテルアミンと硝酸のモル比は0.5、pHは8.3であった。このスラリーは粘度が高くなり、ゲル化現象が確認できた。
本出願は、2008年10月1日出願の日本特許出願2008-256322に基づくものであり、その内容はここに参照として取り込まれる。
Claims (10)
- 平均粒径が40nm以上であるコロイダルシリカ、
水、および
ζ電位調整成分
を含有する研磨液であって、
ζ電位調整成分が、硝酸ナトリウムおよび硫酸ナトリウムからなる群から選ばれる少なくとも1つのナトリウム塩からなるものであり、pHが8以上である研磨液。 - 平均粒径が40nm以上であるコロイダルシリカ、
水、および
ζ電位調整成分
を含有する研磨液であって、
ζ電位調整成分が、水溶性ポリエーテルポリアミンおよび水溶性ポリアルキレンポリアミンからなる群から選ばれる少なくとも1つの水溶性有機高分子と塩酸、硫酸、硝酸、亜硝酸、亜硫酸およびアミド硫酸からなる群から選ばれる少なくとも1つの酸とからなり、前記水溶性有機高分子に対し前記酸をモル比で0.6~1.4の割合で含むものであり、pHが8以上である研磨液。 - 前記ナトリウム塩の含有量が0.01~0.4モル/Lである請求項1に記載の研磨液。
- 前記水溶性有機高分子の含有量が0.0001~0.5モル/Lである請求項2に記載の研磨液。
- コロイダルシリカの平均粒径が100nm以下である請求項1~4の何れか1項に記載の研磨液。
- pHが9~10である請求項1~5の何れか1項に記載の研磨液。
- 請求項1~6の何れか1項に記載の研磨液を用いて被研磨体を研磨する工程を含む研磨方法。
- 前記工程において被研磨体の表面のζ電位を-90mV以上にする請求項7に記載の研磨方法。
- 被研磨体がケイ酸塩ガラス、石英ガラスもしくは石英からなる、または、被研磨体の研磨されるべき表面がケイ酸またはケイ酸塩を含有する請求項7または8に記載の研磨方法。
- 請求項7、8または9に記載の研磨方法を用いる磁気ディスク用ガラス基板の製造方法。
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Cited By (5)
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CN102320744A (zh) * | 2010-05-21 | 2012-01-18 | 株式会社小原 | 玻璃基板 |
JP2012020377A (ja) * | 2010-07-15 | 2012-02-02 | Asahi Glass Co Ltd | 研磨液及び磁気ディスク用ガラス基板の製造方法 |
JP2012056828A (ja) * | 2010-09-13 | 2012-03-22 | Asahi Glass Co Ltd | ガラスの製造方法 |
CN105247049A (zh) * | 2013-03-15 | 2016-01-13 | 米迪缪尼有限公司 | 新型核酸分子 |
US10957557B2 (en) | 2018-11-19 | 2021-03-23 | Samsung Electronics Co., Ltd. | Polishing slurry and method of manufacturing semiconductor device |
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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 |
KR101267982B1 (ko) * | 2011-12-13 | 2013-05-27 | 삼성코닝정밀소재 주식회사 | 반도체 기판의 연마방법 및 반도체 기판의 연마장치 |
JP6029916B2 (ja) * | 2012-09-28 | 2016-11-24 | 株式会社フジミインコーポレーテッド | 研磨用組成物 |
DE102013218880A1 (de) * | 2012-11-20 | 2014-05-22 | Siltronic Ag | Verfahren zum Polieren einer Halbleiterscheibe, umfassend das gleichzeitige Polieren einer Vorderseite und einer Rückseite einer Substratscheibe |
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JP2012020377A (ja) * | 2010-07-15 | 2012-02-02 | Asahi Glass Co Ltd | 研磨液及び磁気ディスク用ガラス基板の製造方法 |
JP2012056828A (ja) * | 2010-09-13 | 2012-03-22 | Asahi Glass Co Ltd | ガラスの製造方法 |
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US20110175018A1 (en) | 2011-07-21 |
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