WO2020095832A1 - 研磨層用ポリウレタン、研磨層、研磨パッド及び研磨層の改質方法 - Google Patents
研磨層用ポリウレタン、研磨層、研磨パッド及び研磨層の改質方法 Download PDFInfo
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- WO2020095832A1 WO2020095832A1 PCT/JP2019/043003 JP2019043003W WO2020095832A1 WO 2020095832 A1 WO2020095832 A1 WO 2020095832A1 JP 2019043003 W JP2019043003 W JP 2019043003W WO 2020095832 A1 WO2020095832 A1 WO 2020095832A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polyurethane
- polishing
- carboxylic acid
- polishing layer
- acid ester
- Prior art date
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- 238000005498 polishing Methods 0.000 title claims abstract description 207
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 132
- 239000004814 polyurethane Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 26
- 125000003262 carboxylic acid ester group Chemical group [H]C([H])([*:2])OC(=O)C([H])([H])[*:1] 0.000 claims abstract description 89
- 125000002843 carboxylic acid group Chemical group 0.000 claims abstract description 20
- 150000003077 polyols Chemical group 0.000 claims description 30
- -1 tartaric acid diester Chemical class 0.000 claims description 30
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 28
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 28
- 229920005862 polyol Polymers 0.000 claims description 21
- 229920000642 polymer Polymers 0.000 claims description 19
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- 239000004970 Chain extender Substances 0.000 claims description 18
- IIFCLXHRIYTHPV-UHFFFAOYSA-N methyl 2,4-dihydroxybenzoate Chemical compound COC(=O)C1=CC=C(O)C=C1O IIFCLXHRIYTHPV-UHFFFAOYSA-N 0.000 claims description 14
- 230000003301 hydrolyzing effect Effects 0.000 claims description 11
- 125000005442 diisocyanate group Chemical group 0.000 claims description 10
- 239000000178 monomer Substances 0.000 claims description 7
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- APCBTRDHCDOPNY-UHFFFAOYSA-N tert-butyl 3-hydroxypyrrolidine-1-carboxylate Chemical compound CC(C)(C)OC(=O)N1CCC(O)C1 APCBTRDHCDOPNY-UHFFFAOYSA-N 0.000 claims description 3
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 12
- 230000004048 modification Effects 0.000 description 12
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
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- 150000001335 aliphatic alkanes Chemical class 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
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- XJMMNTGIMDZPMU-UHFFFAOYSA-N 3-methylglutaric acid Chemical compound OC(=O)CC(C)CC(O)=O XJMMNTGIMDZPMU-UHFFFAOYSA-N 0.000 description 2
- SXFJDZNJHVPHPH-UHFFFAOYSA-N 3-methylpentane-1,5-diol Chemical compound OCCC(C)CCO SXFJDZNJHVPHPH-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 241000694440 Colpidium aqueous Species 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
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- RNVFYQUEEMZKLR-UHFFFAOYSA-N methyl 3,5-dihydroxybenzoate Chemical compound COC(=O)C1=CC(O)=CC(O)=C1 RNVFYQUEEMZKLR-UHFFFAOYSA-N 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
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- LRMDXTVKVHKWEK-UHFFFAOYSA-N 1,2-diaminoanthracene-9,10-dione Chemical compound C1=CC=C2C(=O)C3=C(N)C(N)=CC=C3C(=O)C2=C1 LRMDXTVKVHKWEK-UHFFFAOYSA-N 0.000 description 1
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- ZBMISJGHVWNWTE-UHFFFAOYSA-N 3-(4-aminophenoxy)aniline Chemical compound C1=CC(N)=CC=C1OC1=CC=CC(N)=C1 ZBMISJGHVWNWTE-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a novel polyurethane preferably used as a material for a polishing layer of a polishing pad.
- CMP Chemical mechanical polishing
- CMP is a method for polishing an object to be polished with a polishing pad with high accuracy while supplying a slurry containing abrasive grains and a reaction solution to the surface of the object to be polished.
- Polyurethane is used as a material for a polishing layer of a polishing pad used for CMP.
- Patent Document 1 discloses that when the zeta potential of the polishing surface of the polishing pad is -50 mv or more and less than 0 mv, the repulsion of the negative abrasive grains in the slurry to the polishing surface is suppressed, and It is disclosed that the break-in time can be shortened by improving the compatibility with the abrasive grains.
- Patent Document 2 reduces the occurrence of scratches and defects on the surface of the object to be polished by suppressing the adherence of polishing dust to the polishing surface, improves the yield of products, and has high flatness and appropriateness.
- a polishing pad that can achieve various polishing rates. Specifically, a polishing pad is disclosed in which the zeta potential of the polishing surface facing the object to be polished is smaller than ⁇ 55 mv and ⁇ 100 mv or more.
- Patent Document 3 discloses a polishing pad fixed to a surface plate and used for polishing, which can be polished with a low load in CMP without causing defects in an insulating layer.
- the tensile modulus of elasticity at room temperature is 0.2 GPa or more and is supplied between the object to be polished and the polishing surface of the polishing pad on at least a part of the surface of the polishing pad that contacts the object to be polished.
- a polishing pad having a zeta potential of ⁇ 8.5 mV when CMP is performed using an acidic slurry having a pH of 3 to 5 is disclosed.
- Patent Document 4 discloses that after impregnating a nonwoven fabric with a mixed solution containing (A) a carboxyl group-containing polyurethane resin, (B) an ammonium salt of a carboxylic acid having 1 to 4 carbon atoms, and (C) water. Disclosed is a polishing sheet obtained by drying. Patent Document 4 discloses that a carboxyl group-containing polyurethane resin improves the hydrophilicity of a polishing sheet.
- Patent Document 5 discloses a method for producing a novel optically active polyurethane, which comprises reacting an optically active tartaric acid diester or optically active 1,2-diphenylethylene glycol with a diisocyanate.
- An object of the present invention is to provide a novel polyurethane preferably used as a material for a polishing layer of a polishing pad, a polishing layer containing the same, a polishing pad, and a method for modifying the polishing layer.
- One aspect of the present invention is a polyurethane for a polishing layer having a carboxylic acid ester group.
- the carboxylic acid ester group is hydrolyzed to generate a carboxylic acid.
- the polyurethane having such a carboxylic acid ester group it is possible to generate a carboxylic acid by hydrolyzing the carboxylic acid ester group after molding the polyurethane.
- Carboxylic acid increases the hydrophilicity of the surface of polyurethane and improves the wettability.
- the zeta potential which is the surface potential of the polishing surface, can be adjusted by selecting the hydrolysis treatment condition and adjusting the level of hydrolysis.
- various functional groups can be introduced into polyurethane by changing the carboxylic acid to another functional group.
- the carboxylic acid ester group preferably has at least one of a side chain, a main chain terminal and a main chain skeleton.
- the carboxylic acid ester group is contained in the side chain or terminal, the molecular mobility of the carboxylic acid ester group becomes high.
- the introduction amount of the carboxylic acid ester group can be sufficiently secured regardless of the molecular chain length of the polyurethane.
- the introduction amount of the carboxylic acid ester group can be sufficiently increased regardless of the ratio of the hard / soft segment. Can be secured. Furthermore, when a carboxylic sun ester group is introduced at the terminal, a high modification rate can be stably ensured from the viewpoint of molecular mobility, and the introduction position in the polymer is easily homogenized. A high degree of denaturation can be ensured even in the chain, and the reactivity can be kept stable by making the introduction position uniform.
- examples of the polyurethane having a carboxylic acid ester group include a polyurethane containing a monomer unit having a carboxylic acid ester group.
- it is a polyurethane containing at least (a) a chain extender unit, (b) a polymer polyol unit, and (c) an organic diisocyanate unit as a monomer unit, and (a) a chain extender unit.
- at least one of the polymer polyol units (b) and (b) has a carboxylic acid ester group, from the viewpoint that the polyurethane easily holds the carboxylic acid ester group.
- Specific examples of the (a) chain extender having a carboxylic acid ester group include tartaric acid diester, 1- (tert-butoxycarbonyl) -3-pyrrolidinol, and methyl 2,4-dihydroxybenzoate.
- the polyurethane is preferably a thermoplastic polyurethane because it can be continuously produced by continuous melt polymerization and is excellent in extrusion moldability using a T-die.
- Another aspect of the present invention is a polishing layer containing any of the above polyurethanes.
- the surface properties of such a polishing layer are modified by hydrolyzing the carboxylic acid ester groups after molding.
- the polishing layer is a non-foamed molded article, because a polishing layer that does not fluctuate in polishing characteristics and can realize stable polishing can be obtained.
- another aspect of the present invention includes a step of preparing a polishing layer containing a polyurethane having a carboxylic acid ester group, and a step of hydrolyzing the carboxylic acid ester group of the polyurethane to generate a carboxylic acid group.
- This is a method for modifying the polishing layer. According to such a method for modifying a polishing layer, it is possible to modify the surface characteristics by hydrolyzing a carboxylic acid ester group after forming the polishing layer to generate a carboxylic acid on the surface of the polishing layer. Therefore, when such a polishing layer is used, the zeta potential, which is the surface potential of the polishing surface, can be adjusted by modifying the surface characteristics.
- Another aspect of the present invention is a polishing layer containing a thermoplastic polyurethane having a carboxylic acid group, which has a zeta potential of ⁇ 1.0 mV or less at pH 3.0 to PH 8.0.
- a polishing layer is preferable in that not only an alkaline slurry but also an acidic slurry is used because it has a high affinity for the abrasive grains.
- the polishing layer has a contact angle with water of 80 degrees or less in terms of excellent polishing uniformity and polishing stability.
- Another aspect of the present invention is a polishing pad including any one of the above polishing layers.
- a novel polyurethane preferably used as a material for the polishing layer of the polishing pad can be obtained. Further, the surface characteristics of the polishing layer of the polishing pad are easily modified after molding.
- FIG. 1 is a schematic structural diagram of polyurethane having a carboxylic acid ester group.
- FIG. 2 is an explanatory diagram illustrating a process of modifying a polyurethane having a carboxylic acid ester group into a polyurethane having a carboxylic acid group.
- FIG. 3 is an explanatory diagram illustrating the dissociation of carboxylic acid groups introduced into polyurethane.
- FIG. 4 is an explanatory diagram illustrating a polishing method using the polishing pad of the embodiment.
- the polyurethane of this embodiment is a polyurethane having a carboxylic acid ester group.
- Specific examples thereof include a polyurethane having a carboxylic acid ester group in at least one of a side chain, a main chain terminal and a main chain skeleton.
- the polyurethane having a carboxylic acid ester group contains, for example, at least (a) a chain extender, (b) a polymer polyol, and (c) an organic diisocyanate, and at least the (a) chain extender and (b) a polymer polyol.
- a monomer raw material of polyurethane, one of which is a compound having a carboxylic acid ester group, is produced by a known method for producing polyurethane using a prepolymer method or a one-shot method.
- a method of continuously melt-polymerizing a monomer raw material of polyurethane by melt-mixing using a single-screw or multi-screw extruder at a predetermined ratio in the substantial absence of a solvent, and a solvent examples thereof include a method of carrying out solution polymerization in the presence and a method of emulsion polymerization.
- the polyurethane may be thermoplastic polyurethane or thermosetting polyurethane.
- thermoplastic polyurethane When used as the polishing layer of the polishing pad, thermoplastic polyurethane is preferable from the viewpoint of excellent extrusion moldability using a T-die.
- a thermoplastic polyurethane will be described in detail as a representative example as an example of a polyurethane having a carboxylic acid ester group.
- the chain extender (a) is a low molecular weight compound having two or more active hydrogen atoms capable of reacting with an isocyanate group in a molecule, preferably a molecular weight of 300 or less, such as a diol compound or a diamine compound.
- a chain extender (a1) having a carboxylic acid ester group is preferable to use as at least a part of the chain extender (a).
- chain extender (a1) having a carboxylic acid ester group include, for example, tartaric acid diesters such as diethyl tartrate and dimethyl tartrate; methyl 2,4-dihydroxybenzoate, methyl 3,5-dihydroxybenzoate, neopentyl.
- examples include diols, diamines, or their derivatives containing a carboxylic acid ester group such as glycol mono (hydroxypivalate). These may be used alone or in combination of two or more.
- diethyl tartrate is particularly preferable because it is easy to obtain a polyurethane having excellent reactivity and mechanical properties.
- the chain extender (a2) having no carboxylic acid ester group other than the chain extender (a1) having a carboxylic acid ester group does not have a carboxylic acid ester group, which has been conventionally used in the production of polyurethane.
- a low molecular weight compound having a molecular weight of 300 or less and having two or more active hydrogen atoms capable of reacting with an isocyanate group in the molecule can be mentioned.
- ethylene glycol diethylene glycol, 1,2-propanediol, 1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,2-butanediol, 1,3 -Butanediol, 2,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,4 -Bis ( ⁇ -hydroxyethoxy) benzene, 1,4-cyclohexanediol, cyclohexanedimethanol such as 1,4-cyclohexanedimethanol, bis ( ⁇ -hydroxyethyl) terephthalate, 1,9-nonanediol, m-xylylene Diols such as glycol, p-xylylene glycol, 1,2-
- neopentyl glycol mono (hydroxypivalate) 1- (tert-butoxycarbonyl) -3-pyrrolidinol etc.
- a monool or monoamine having a carboxylic acid ester group may be used. These may be used alone or in combination of two or more.
- the proportion of the chain extender (a1) in the total amount of the chain extender (a) is appropriately selected, but for example, 5 It is preferably from 95 to 95 mol%, more preferably from 10 to 90 mol% from the viewpoint that the carboxylic acid ester group can be sufficiently imparted to the side chain or main chain terminal of the polyurethane.
- high molecular weight polyol (b) examples include high molecular weight polyols having a number average molecular weight of more than 300 such as polyether polyol, polyester polyol, and polycarbonate polyol. Further, when producing a thermoplastic polyurethane, a polymer diol is mainly used. Further, a polymer polyol (b1) having a carboxylic acid ester group may be used in order to retain the carboxylic acid ester group in the polyurethane.
- polymer polyol (b1) having a carboxylic acid ester group examples include a polycarbonate diol having a carboxylic acid ester group.
- polymer polyol (b2) having no carboxylic acid ester group other than the polymer polyol (b1) having a carboxylic acid ester group does not have a carboxylic acid ester group, which is conventionally used in the production of polyurethane.
- Polymer polyols having a number average molecular weight of more than 300 such as polyether polyols, polyester polyols and polycarbonate polyols can be used without particular limitation.
- high molecular weight polyol (b2) examples include, for example, polyether diol, polyester diol, and polycarbonate diol having no carboxylic acid ester group. These may be used alone or in combination of two or more.
- polyether diol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, poly (methyltetramethylene) glycol, glycerin-based polyalkylene ether glycol and the like. These may be used alone or in combination of two or more. Of these, polyethylene glycol and polytetramethylene glycol are preferred, with polytetramethylene glycol being particularly preferred.
- the polyester diol can be obtained, for example, by directly esterifying or transesterifying a low-molecular diol with an ester-forming derivative such as dicarboxylic acid or its ester or its anhydride.
- ester-forming derivative such as dicarboxylic acid or its ester and its anhydride for producing polyester diol
- ester-forming derivative such as dicarboxylic acid or its ester and its anhydride for producing polyester diol
- examples of the ester-forming derivative include, for example, oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, and azelaic acid.
- dimer acid and hydrogenated dimer acid include, for example, trade names “PRIPOL 1004”, “PRIPOL 1006”, “PRIPOL 1009”, and “PRIPOL 1013” manufactured by Unichema. These may be used alone or in combination of two or more.
- the low molecular weight diol for producing the polyester diol include, for example, ethylene glycol, 1,3-propanediol, 1,2-propanediol, 2-methyl-1,3-propanediol, 1, 4-butanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 2- Aliphatic diols such as methyl-1,8-octanediol, 1,9-nonanediol, and 1,10-decanediol; alicyclic diols such as cyclohexanedimethanol and cyclohexanediol. These may be used alone or in combination of two or more. Among these, diols having 6
- Examples of the polycarbonate diol include those obtained by reacting a low molecular weight diol with a carbonate compound such as dialkyl carbonate, alkylene carbonate and diaryl carbonate.
- Examples of the low molecular weight diol for producing the polycarbonate diol include the low molecular weight diols exemplified above.
- Examples of the dialkyl carbonate include dimethyl carbonate and diethyl carbonate.
- Examples of the alkylene carbonate include ethylene carbonate and the like. Diphenyl carbonate etc. are mentioned as a diaryl carbonate.
- the number average molecular weight of the high molecular weight polyol (b) is 300 to 3,000, more preferably 500 to 2,700, and particularly 500 to 2,400, which is suitable for a polishing layer that maintains required properties such as rigidity, hardness and hydrophilicity. It is preferable that a polyurethane is easily obtained.
- the number average molecular weight of the polymer diol means the number average molecular weight calculated based on the hydroxyl value measured according to JIS K1557.
- the proportion of the polymer polyol (b1) in the total amount of the polymer polyol (b) is appropriately selected, and for example, 10 to 100 mol%, Is preferably 20 to 90 mol% from the viewpoint that the carboxylic acid ester group can be sufficiently imparted to the polyurethane while maintaining the mechanical properties.
- any organic diisocyanate conventionally used in the production of polyurethane can be used without particular limitation.
- Specific examples thereof include ethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, dodecamethylene diisocyanate and isophorone.
- Diisocyanate isopropylidene bis (4-cyclohexyl isocyanate), cyclohexylmethane diisocyanate, methylcyclohexane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, lysine diisocyanate, 2,6-diisocyanatomethylcaproate, bis (2-isocyanatoethyl) ) Fumarate, bis (2-isocyanatoethyl) carbonate, 2-isocyanatoethyl-2,6-diisocyanatohexano , Cyclohexylene diisocyanate, methylcyclohexylene diisocyanate, bis (2-isocyanatoethyl) -4-cyclohexene and other aliphatic or cycloaliphatic diisocyanates; 2,4'-diphenylmethane diisocyanate, 4,4'-dipheny
- 4,4'-diphenylmethane diisocyanate is particularly preferable from the viewpoint that a polyurethane having excellent abrasion resistance and suitable for a polishing layer can be obtained.
- thermoplastic polyurethane having a carboxylic acid ester group is obtained by a known method for producing a polyurethane using a prepolymer method or a one-shot method using a monomer raw material of a polyurethane containing a compound having a carboxylic acid ester group.
- a one-shot method in which the above-mentioned components are blended in a predetermined ratio and continuously melt-polymerized while being melt-mixed using a single-screw or multi-screw extruder is produced. It is preferable in terms of excellent properties.
- the blending ratio of each component is adjusted appropriately according to the desired characteristics. For example, 0.95 to 1.3 mol of the isocyanate group contained in the organic diisocyanate (c), and 1 mol of the active hydrogen atom contained in the chain extender (a) and the polymer polyol (b), It is preferably blended in a ratio of 0.96 to 1.10 mol, particularly 0.97 to 1.05 mol.
- thermoplastic polyurethane having a carboxylic acid ester group obtained by continuous melt polymerization as described above is, for example, pelletized and then subjected to various extrusion molding methods, injection molding methods, blow molding methods, calender molding methods, and the like. It is molded into a sheet-shaped molded body by the molding method of.
- extrusion molding using a T die is preferable in that a sheet-shaped molded product having a uniform thickness can be continuously produced.
- the melting point on the high temperature side which is the melting point of the crystal of the hard segment, is preferably 50 to 100 ° C., more preferably 60 to 90 ° C. from the viewpoint of workability.
- the polyurethane produced as described above has a carboxylic acid ester group.
- a schematic structural diagram of such a polyurethane is shown in FIG.
- the content ratio of the carboxylic acid ester group in the polyurethane is not particularly limited. However, when it is 1 to 20% by mass, and further 3 to 10% by mass in terms of carboxylic acid, the effect of surface modification of the polyurethane is remarkable. It is preferable because it is easily obtained.
- Polyurethane may be a cross-linking agent, a filler, a cross-linking accelerator, a cross-linking aid, a softening agent, a tackifier, an anti-aging agent, a foaming agent, a processing aid, an adhesion-imparting agent, an inorganic filler, if necessary.
- the polyurethane of this embodiment is preferably a thermoplastic polyurethane.
- thermoplastic means a property that can be molded by a molding method including a step of heating and melting such as extrusion molding, injection molding, calender molding, and 3D printer molding.
- the molded body for a polishing pad used as the polishing layer of the polishing pad is obtained by molding polyurethane by the various molding methods described above.
- extrusion molding using a T-die because it is excellent in productivity and a sheet-shaped molded product having a uniform thickness can be easily obtained.
- the polishing pad molding may be a foam molding or a non-foam molding.
- a non-foamed molded product is preferable because the polishing characteristics do not fluctuate and stable polishing can be realized.
- polishing characteristics such as flatness and flattening efficiency are likely to change due to variation in the foam structure.
- polishing characteristics such as flatness and flattening efficiency are likely to change due to variation in the foam structure.
- it becomes difficult to increase hardness for improving flatness there is a tendency that it becomes difficult to increase hardness for improving flatness.
- a carboxylic acid group can be generated on the surface of a polyurethane molded body by hydrolyzing a carboxylic acid ester group present in at least one of a side chain, a main chain terminal and a main chain skeleton of polyurethane. .. Further, the carboxylic acid retained on the polyurethane can be converted into another functional group. Further, the amount of carboxylic acid to be produced can be adjusted by selecting the conditions for hydrolyzing the carboxylic acid ester group.
- Carboxylic acid groups can be generated on the surface of polyurethane by hydrolyzing the carboxylic acid ester groups present in polyurethane. Specifically, for example, as shown in FIG. 2, a carboxylic acid ester group of a polyurethane molded product having a carboxylic acid ester group can be hydrolyzed to convert the carboxylic acid ester group into a carboxylic acid group. ..
- the hydrolysis reaction is carried out by treating with a water-containing liquid.
- a water-containing liquid for example, an acidic aqueous solution such as hydrochloric acid, or a basic solution such as an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution, or an aqueous ammonia solution is preferably used from the viewpoint that hydrolysis is promoted by the catalytic action.
- an aqueous solution of sodium hydroxide or an aqueous solution of potassium hydroxide from the viewpoint of the reactivity of hydrolysis.
- the temperature of the hydrous liquid for hydrolysis is not particularly limited, but it is preferably 20 to 90 ° C., more preferably 30 to 80 ° C. from the viewpoint of easy control of the hydrolysis reaction.
- the time of treatment with the water-containing liquid is not particularly limited, but it is preferably 5 to 1440 minutes, more preferably 60 to 720 minutes from the viewpoint of easy control of hydrolysis.
- the polyurethane thus modified by hydrolyzing the carboxylic acid ester group has a carboxylic acid group.
- the carboxylic acid group imparted to the polyester is dissociated into —COO ⁇ and H + when it comes into contact with an aqueous solution containing an acidic region and having a pH for ionizing the carboxylic acid group.
- -COO the surface - by imparting a negative potential to the surface of the polyurethane.
- Such a negative potential lowers the zeta potential in the acidic region and improves the affinity with the abrasive grains in the acidic slurry in the application as the polishing layer of the polishing pad described later.
- the carboxylic acid group of the polyurethane improves the wettability by increasing the hydrophilicity of the surface of the polyurethane.
- a polyurethane is preferably used for various uses of polyurethane, which are required to be modified in hydrophilicity and electric characteristics. Particularly, it is preferably used as a molded body for a polishing pad used as a polishing layer of a polishing pad.
- the affinity with the abrasive grains is improved by lowering the surface potential of the polishing layer.
- the polishing pad of the present embodiment includes a polishing layer obtained by cutting out a piece such as a circle from a sheet-shaped molded body of polyurethane having a carboxylic acid ester group.
- the slurry used for CMP includes an acidic slurry and an alkaline slurry.
- the acidic slurry and the alkaline slurry are selected depending on the purpose of polishing, or used in combination when performing a multi-step polishing process.
- the abrasive grains contained in the alkaline slurry usually have a negative zeta potential.
- a polishing layer having a negative zeta potential when using an alkaline slurry, it is possible to keep the zeta potential of the polishing layer negative, thereby making it difficult for polishing debris to adhere to the polishing layer and causing scratches and scratches. The occurrence of defects is reduced.
- the zeta potential is often positive when an acidic slurry is used.
- abrasive grains in acidic slurry have a positive zeta potential.
- the zeta potential on the surface of a silicon wafer is usually negative in acid.
- the zeta potential of a general polyurethane becomes positive in an acidic region, particularly in a pH region lower than pH3, becomes an isoelectric point near pH3 and approaches 0, and becomes negative in an alkaline region where pH is high. Tend to be.
- the present inventors have found that by interposing abrasive grains having a positive zeta potential between a substrate having a negative zeta potential and a polishing layer having a negative zeta potential, the gap between the substrate and the polishing layer is increased. Has realized a means for stabilizing the abrasive grains and improving the polishing rate.
- the molded body used as the material for the polishing layer of the present embodiment is a polyurethane molded body having a carboxylic acid group. Polishing layer using a polyurethane molded article having a carboxylic acid group on the surface, the carboxylic acid group of the polishing surface when in contact with an acidic slurry -COO - at pH3.0 the zeta potential by dissociating -1. It is possible to realize a polished surface that is 0 mV or less. When the zeta potential at pH 3.0 is ⁇ 1.0 mV or less, it exhibits a high affinity with the abrasive grains having a positive zeta potential in the acidic region.
- the abrasive grains are a base material and a polishing layer. High polishing rates can be achieved due to their high affinity for both.
- the zeta potential of the polyurethane forming the polishing layer at pH 3.0 to pH 8.0 is -1.0 mV or less, more preferably -2.0 mV to -40 mV, and especially -3.0 to -30 mV, especially -5. It is preferably 0 to -20 mV.
- the zeta potential of the polishing pad at pH 3.0 exceeds -1.0, the polishing slurry and the polishing pad are likely to electrically repel each other, resulting in a low affinity.
- the zeta potential is a potential generated on the electric double layer surface (sliding surface) by counter ions when a substance comes into contact with a liquid, depending on the surface charge of the substance.
- the zeta potential is a monitor latex (ELS-Z, manufactured by Otsuka Electronics Co., Ltd.) dispersed in a 10 mM NaCl aqueous solution adjusted to pH 3.0 with an aqueous HCl solution. It is a zeta potential measured by using Otsuka Electronics Co., Ltd.
- the zeta potential of the polyurethane forming the polishing layer at pH 4.0 is -1.0 mV or less, more preferably -5.5 to -40 mV, and especially -7.5 to -30 mV, and especially -10.0. It is preferably from ⁇ 30 mV from the viewpoint of easily obtaining a polishing layer having a zeta potential of ⁇ 1.0 mV or less at pH 3.0.
- the storage elastic modulus at 50 ° C. after being saturated and swollen with water at 50 ° C. is preferably 50 to 1200 MPa, further 100 to 1100 MPa, and particularly preferably 200 to 1000 MPa. If the storage elastic modulus at 50 ° C. of the polyurethane after saturated swelling with water at 50 ° C. is too low, the polishing layer becomes too soft and the polishing rate decreases, and if too high, the surface to be polished of the object to be polished Scratches tend to increase.
- the polyurethane forming the polishing layer has a content of nitrogen atoms derived from an isocyanate group of 4.5 to 7.6% by mass, further 5.0 to 7.4% by mass, and particularly 5.2. It is preferably in the range of ⁇ 7.3 mass% from the viewpoint that it is easy to obtain a polyurethane having a storage elastic modulus at 50 ° C. of 50 to 1200 MPa after being saturated and swollen with water at 50 ° C.
- the polyurethane forming the polishing layer preferably has a contact angle with water of 80 degrees or less, more preferably 78 degrees or less, particularly 76 degrees or less, and especially 74 degrees or less. If the contact angle of the polyurethane with water is too large, the hydrophilicity of the polishing surface of the polishing layer decreases, and scratches tend to increase.
- the polishing layer is finished by adjusting the size, shape, thickness, etc. by cutting, slicing, punching, etc. of the polishing pad molding.
- the thickness of the polishing layer is not particularly limited, but is 0.3 to 5 mm, more preferably 1.7 to 2.8 mm, and particularly 2.0 to 2.5 mm for ease of production and handling, and polishing performance. Is preferred because of its stability.
- the hardness of the polishing layer is preferably 60 or more, further preferably 65 or more in JIS-D hardness. If the JIS-D hardness is too low, the followability of the polishing pad to the surface to be polished tends to be high and the local flatness tends to be lowered.
- the polishing surface of the polishing layer is provided with recesses that are grooves or holes in a predetermined concentric pattern by grinding or laser processing.
- Such recesses serve to uniformly and sufficiently supply the slurry to the polishing surface, to discharge polishing debris that causes scratches, and to prevent wafer damage due to adsorption of the polishing layer.
- the distance between the grooves is preferably 1.0 to 50 mm, more preferably 1.5 to 30 mm, and especially about 2.0 to 15 mm.
- the width of the groove is preferably 0.1 to 3.0 mm, more preferably 0.2 to 2.0 mm.
- the depth of the groove is preferably 0.2 to 1.8 mm, more preferably 0.4 to 1.5 mm.
- the cross-sectional shape of the groove for example, a shape such as a rectangle, a trapezoid, a triangle, and a semicircle is appropriately selected according to the purpose.
- the density is preferably 1.0 g / cm 3 or more, further 1.1 g / cm 3 or more, and particularly 1.2 g / cm 3 or more. If the density of the non-foamed molded product is too low, the polishing layer tends to be too soft and the local flatness tends to decrease.
- the polishing pad is a multi-layer type polishing pad in which a cushion layer is laminated on the surface of the polishing layer, which is not the polishing surface, even if it is a single-layer type polishing pad consisting only of the polishing layer of the polyurethane molded body. Good.
- the cushion layer is preferably a layer having a hardness lower than that of the polishing layer. When the hardness of the cushion layer is lower than that of the polishing layer, the hard polishing layer follows the local unevenness of the surface to be polished, and the cushion layer does not warp or swell the entire substrate to be polished. Since it follows, polishing with an excellent balance between global flatness and local flatness becomes possible.
- the material used as the cushion layer include a composite obtained by impregnating a non-woven fabric with polyurethane (for example, “Suba400” (manufactured by Nitta Haas Co., Ltd.)); natural rubber, nitrile rubber, polybutadiene rubber, silicone rubber, etc. Rubbers; thermoplastic elastomers such as polyester-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, fluorine-based thermoplastic elastomers; foamed plastics; polyurethanes and the like.
- polyurethane having a foamed structure is particularly preferable because it is easy to obtain a preferable flexibility as the cushion layer.
- the thickness of the cushion layer is not particularly limited, but is preferably about 0.5 to 5 mm, for example. If the cushion layer is too thin, the effect of following the warp or waviness of the entire surface to be polished is reduced, and global flatness tends to be reduced. On the other hand, if the cushion layer is too thick, the entire polishing pad tends to be soft and stable polishing tends to be difficult.
- the polishing pad preferably has a thickness of about 0.3 to 5 mm.
- CMP for example, a CMP device 10 including a circular rotary platen 2, a slurry supply nozzle 3, a carrier 4, and a pad conditioner 6 when viewed from above as shown in FIG. 4 is used.
- the polishing pad 1 provided with the above-mentioned polishing layer is attached to the surface of the rotary platen 2 by a double-sided tape or the like. Further, the carrier 4 supports the object to be polished 5.
- the rotary platen 2 is rotated in the direction indicated by the arrow by a motor (not shown). Further, the carrier 4 is rotated in the plane of the rotary platen 2 by a motor (not shown), for example, in a direction indicated by an arrow.
- the pad conditioner 6 also rotates in the plane of the rotary platen 2 in the direction indicated by the arrow by a motor (not shown).
- polishing surface of the polishing pad 1 which is fixed to the rotating surface plate 2 and rotates, for example, by pressing a pad conditioner 6 for CMP in which diamond particles are fixed to the carrier surface by nickel electrodeposition or the like.
- the polishing surface of the polishing pad 1 is conditioned. By conditioning, the polishing surface is adjusted to have a surface roughness suitable for polishing the surface to be polished.
- the slurry 7 is supplied from the slurry supply nozzle 3 to the polishing surface of the rotating polishing pad 1. Further, when performing CMP, a lubricating oil, a coolant, etc. may be used together with the slurry, if necessary.
- the slurry is, for example, a liquid medium such as water or oil; abrasive grains such as silica, alumina, cerium oxide, zirconium oxide, or silicon carbide; bases, acids, surfactants, oxidizing agents such as hydrogen peroxide solution, A slurry used in CMP containing a reducing agent, a chelating agent, etc. is preferably used.
- the slurries include acidic slurries, alkaline slurries, and slurries in the vicinity of neutrality.
- the pH is particularly 2.0 to 7.0, especially Is preferable because it can maintain a high affinity with the slurry even when CMP is performed using an acidic slurry having a pH of 3.0 to 6.0.
- the object to be polished 5 which is fixed to the carrier 4 and rotates is pressed against the polishing pad 1 in which the slurry 7 is evenly spread over the polishing surface of the polishing layer. Then, the polishing process is continued until a predetermined flatness is obtained.
- the finish quality is affected by adjusting the pressing force applied during polishing and the speed of relative movement between the rotary platen 2 and the carrier 4.
- the polishing conditions are not particularly limited, but in order to perform polishing efficiently, the rotation speed of each of the rotary platen and the carrier is preferably low rotation of 300 rpm or less, and the pressure applied to the object to be polished causes scratches after polishing. In order not to do so, the pressure is preferably 150 kPa or less.
- the rotation speed of each of the rotary platen and the carrier is preferably low rotation of 300 rpm or less, and the pressure applied to the object to be polished causes scratches after polishing. In order not to do so, the pressure is preferably 150 kPa or less.
- the supply amount of the slurry is not particularly limited, it is preferable to supply the slurry so that the polishing surface is always covered with the slurry.
- polishing After the polishing, it is preferable to thoroughly wash the object to be polished with running water, and then use a spin dryer or the like to remove the water droplets attached to the object to be dried.
- a spin dryer or the like to remove the water droplets attached to the object to be dried.
- Such CMP is preferably used for polishing in the manufacturing process of various semiconductor devices and MEMS (Micro Electro Mechanical Systems).
- the object to be polished include an insulating film such as an oxide film formed on a semiconductor substrate, a wiring metal film such as copper, aluminum, or tungsten; a barrier metal film such as tantalum, titanium, tantalum nitride, or titanium nitride. Especially, it is preferably used for polishing an insulating film such as an oxide film. It is also possible to polish a metal film on which a pattern such as a wiring pattern or a dummy pattern is formed. The pitch between lines in the pattern varies depending on the product, but is usually about 50 nm to 100 ⁇ m.
- Example 1 Polytetramethylene glycol (PTMG850) having a number average molecular weight of 850, diethyl tartrate (DET), 1,4-butanediol (1,4-BD), and 4,4′-diphenylmethane diisocyanate (MDI) in a mass ratio
- the raw material mixture is continuously supplied to a twin-screw extruder rotating coaxially with a metering pump, continuous melt polymerization is performed, and the melt is continuously extruded into water from a die of the twin-screw extruder and cooled.
- a strand was formed by, and the strand was chopped into pellets with a pelletizer, and dehumidified and dried at 80 ° C. for 20 hours to produce pellets of a thermoplastic polyurethane (PU1) having a carboxylic acid ester group as a side chain.
- PU1 thermoplastic polyurethane
- thermoplastic polyurethane PU1
- the zeta potentials at pH 3.0, pH 4.0, and pH 7.0 of each test piece were measured using an electrophoretic light scattering device (ELS-Z, manufactured by Otsuka Electronics Co., Ltd.). Specifically, a sample was attached to a flat plate measurement cell of an electrophoretic light scattering device and dispersed in a 10 mM sodium chloride aqueous solution adjusted to pH 3.0 and pH 4.0 with an aqueous hydrochloric acid solution (Otsuka Electronics Co., Ltd. )). Similarly, the measurement was performed using a monitor latex dispersed in a 10 mM sodium chloride aqueous solution adjusted to pH 7.0 with a sodium hydroxide aqueous solution.
- ELS-Z electrophoretic light scattering device
- a PU1 film having a thickness of 300 ⁇ m was produced using a hot press machine. Then, the film of PU1 was subjected to the modification treatment under the same conditions as the modification treatment described above. Then, the film before and after the modification treatment was left for 3 days under the conditions of 20 ° C. and 65% RH. Then, the contact angle of each film before and after the modification treatment with water was measured using DropMaster500 manufactured by Kyowa Interface Science Co., Ltd.
- thermoplastic polyurethane PU6
- PU6 thermoplastic polyurethane
- the polyurethanes of Examples 1 to 5 having a carboxylic acid ester group on at least one of a side chain and a main chain terminal were modified as compared with the polyurethane of Comparative Example 1 having no carboxylic acid ester group. It can be seen that the zeta potential is lowered by the treatment. Also, it can be seen that the contact angle becomes smaller accordingly.
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Abstract
Description
数平均分子量850のポリテトラメチレングリコール(PTMG850)、酒石酸ジエチル(DET)、1,4-ブタンジオール(1,4-BD)、および4,4’-ジフェニルメタンジイソシアネート(MDI)を、質量比で、PTMG850:DET:1,4-BD:MDI=17.9:8.70:15.2:58.1となる割合で混合した原料配合物を調整した。このとき、DET/1,4-BD=20/80(モル比)であった。そして、同軸で回転する2軸押出機に原料配合物を定量ポンプで連続的に供給し、連続溶融重合を行い、2軸押出機のダイスから溶融物を水中に連続的に押出して冷却することによりストランドを形成させ、ストランドをペレタイザーでペレット状に細断し、80℃で20時間除湿乾燥することにより、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU1)のペレットを製造した。
5~14gのPU1のペレットをテフロン(登録商標)のシートに挟み、熱プレス機を用いて200~230℃で熱プレスして成形した。このようにして厚さ0.3~0.5mmのPU1の非発泡成形体を得た。そして、PU1の非発泡成形体のカルボン酸エステル基を加水分解させるための改質処理をすることにより、カルボン酸エステル基をカルボン酸基に変換させた。改質処理の条件は、(i)50℃の水酸化カリウム(KOH)水溶液(0.1M)に24時間浸漬、(ii)50℃の塩酸(HCl)水溶液(0.1M)に24時間浸漬、(iii)50℃の純水に24時間浸漬、の3条件でそれぞれ行った。このようにして、表面にカルボン酸基を有する熱可塑性ポリウレタンの非発泡成形体を得た。
そして、改質処理前後の熱可塑性ポリウレタンの非発泡成形体をそれぞれ30mm×60mmに切り出し、それらの表面を洗浄して試験片を作成した。そして、各試験片のpH3.0、pH4.0、及びpH7.0におけるゼータ電位を電気泳動光散乱装置(ELS-Z、大塚電子(株)製)を用いて測定した。具体的には、電気泳動光散乱装置の平板測定用セルにサンプルを取り付け、塩酸水溶液でpH3.0、及びpH4.0に調整された10mM 塩化ナトリウム水溶液に分散させたモニターラテックス(大塚電子(株)製)を用いて測定した。同様に、水酸化ナトリウム水溶液でpH7.0に調整した10mM 塩化ナトリウム水溶液に分散させたモニターラテックスを用いて測定した。
熱プレス機を用いて厚さ300μmのPU1のフィルムを作製した。そして、上述した改質処理と同様の条件で、PU1のフィルムを改質処理した。そして、改質処理前後のフィルムをそれぞれ、20℃、65%RHの条件下に3日間放置した。そして改質処理前後の各フィルムの水に対する接触角を、協和界面科学(株)製DropMaster500を用いて測定した。
原料配合物を、PTMG850:DET:1,4-BD:MDI=12.1:18.0:11.8:58.1となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU2)のペレットを製造した。このとき、DET/1,4-BD=40/60(モル比)であった。そして、PU1のペレットの代わりにPU2のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
原料配合物を、PTMG850:DET:1,4-BD:MDI=13.4:9.4:16.4:60.8となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU3)のペレットを製造した。このとき、DET/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU3のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850、1-(tert-ブトキシカルボニル)-3-ピロリジノール(BCP)、1,4-BD、及びMDIを、PTMG850:BCP:1,4-BD:MDI=19.0:7.90:15.1:58.1、となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を末端に有する熱可塑性ポリウレタン(PU4)のペレットを製造した。このとき、BCP/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU4のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850、2,4-ジヒドロキシ安息香酸メチル(MDB)、1,4-BD、及びMDIを、PTMG850:MDB:1,4-BD:MDI=19.7:7.0:15.1:58.1、となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、カルボン酸エステル基を側鎖に有する熱可塑性ポリウレタン(PU5)のペレットを製造した。このとき、MDB/1,4-BD=20/80(モル比)であった。そして、PU1のペレットの代わりにPU5のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
PTMG850:1,4-BD:MDI=23.5:18.4:58.1となる割合で配合した原料配合物に変更した以外は実施例1と同様にして、熱可塑性ポリウレタン(PU6)のペレットを製造した。なお、PU6は、カルボン酸エステル基を側鎖に有しない。そして、PU1のペレットの代わりにPU6のペレットを用いた以外は実施例1と同様にして、熱可塑性ポリウレタンの特性を評価した。結果を表1に示す。
Claims (12)
- カルボン酸エステル基を有する研磨層用ポリウレタン。
- 前記カルボン酸エステル基を側鎖,主鎖末端及び主鎖骨格の少なくとも一つに有する請求項1に記載の研磨層用ポリウレタン。
- カルボン酸エステル基を有する単量体単位を含む請求項1または2に記載の研磨層用ポリウレタン。
- 前記単量体単位として、(a)鎖伸長剤単位、(b)高分子ポリオール単位、及び(c)有機ジイソシアネート単位を少なくとも含み、前記(a)鎖伸長剤単位及び前記(b)高分子ポリオール単位の少なくとも一方が前記カルボン酸エステル基を有する請求項3に記載の研磨層用ポリウレタン。
- 前記(a)鎖伸長剤単位が、酒石酸ジエステル,1-(tert-ブトキシカルボニル)-3-ピロリジノール,及び2,4-ジヒドロキシ安息香酸メチルからなる群から選ばれる少なくとも1種の化合物に由来する単量体単位を含む請求項4に記載の研磨層用ポリウレタン。
- 熱可塑性ポリウレタンである請求項1~5の何れか1項に記載の研磨層用ポリウレタン。
- 請求項1~6の何れか1項に記載の研磨層用ポリウレタンを含む研磨層。
- 前記研磨層用ポリウレタンの非発泡成形体である請求項7に記載の研磨層。
- カルボン酸エステル基を有するポリウレタンを含む研磨層を準備する工程と、
前記ポリウレタンの前記カルボン酸エステル基を加水分解させてカルボン酸基を生成させる工程と、を備えることを特徴とする研磨層の改質方法。 - カルボン酸基を有する熱可塑性ポリウレタンの成形体を含む研磨層であって、
pH3.0~PH8.0におけるゼータ電位が-1.0mV以下であることを特徴とする研磨層。 - 水との接触角が80度以下である請求項10に記載の研磨層。
- 請求項7~11の何れか1項に記載の研磨層を含む研磨パッド。
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SG11202103983YA SG11202103983YA (en) | 2018-11-09 | 2019-11-01 | Polyurethane for use in polishing layer, polishing layer, polishing pad, and method for modifying polishing layer |
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EP19882078.9A EP3878897A4 (en) | 2018-11-09 | 2019-11-01 | POLYURETHANE FOR POLISHING LAYERS, POLISHING LAYER, POLISHING PAD AND POLISHING LAYER MODIFICATION METHOD |
CN201980067771.3A CN112839985B (zh) | 2018-11-09 | 2019-11-01 | 抛光层用聚氨酯、抛光层、抛光垫及抛光层的改性方法 |
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